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2. Repeated clearing as a mechanism for savanna recovery following bush encroachment.

Author

Wedel, Emily R., Nippert, Jesse B., O'Connor, Rory C., Nkuna, Peace, and Swemmer, Anthony M.

Subjects
SAVANNAS, SOIL depth, SOIL moisture, WOODY plants, STABLE isotopes, JOB vacancies, GRAZING, RANGE management
Abstract

Many savannas are experiencing increased cover of trees and shrubs, resulting in reduced herbaceous productivity, shifts in savanna functional structure and potential reductions in ecotourism. Clearing woody plants has been suggested as an effective management strategy to mitigate these effects and restore these systems to an open state with higher rates of grass production and herbivory. This study investigated the effectiveness of repeated shrub clearing as a tool to mitigate bush encroachment in a semi‐arid savanna in southern Africa.We present data from a 7‐year experiment in the Mthimkhulu Game Reserve bordering Kruger National Park, South Africa. Colophospermum mopane stems and resprouting shoots were basally cut 2–3 times per year (2015–2022) in three pairs of treatment and control plots of 60 × 60 m. We monitored changes in soil moisture, grass biomass and herbivore activity via dung counts. We assessed C. mopane physiological responses to repeated cutting using non‐structural carbohydrates and stable water isotopes to infer changes to energy storage and functional rooting depth, respectively.The cleared treatment had higher soil moisture and grass biomass than the control treatment. Dung counts showed impala and buffalo visited the cleared treatment more frequently than the control treatment.Repeated cutting had limited effects on C. mopane survival in the first 2–3 years after initial clearing, but 80% of individuals were dead after 7 years. Repeatedly cut C. mopane had lower belowground starch concentrations and used water from shallower soil depths than C. mopane in control plots.Synthesis and applications. Repeated cutting increased soil moisture availability and grass biomass, and attracted charismatic grazing herbivores. While more costly than once‐off clearing methods, this practice created more employment opportunities for a neighbouring rural community. Transforming portions of the ecosystem to a grass‐dominated state may increase ecotourism potential through improved game viewing in open systems. [ABSTRACT FROM AUTHOR]

Published
2024
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5. Recovery of a subtropical headwater fish community following a large flood, Klaserie River, Limpopo River System, South Africa.

Author

Mohlala, Thabo David, Marr, Sean Murray, and Swemmer, Anthony Michael

Subjects
WATERSHEDS, FISH communities, FISHING villages, LIFE history theory, RARE fishes, RAINFALL, FLOODS
Abstract

Headwaters are important refuges for threatened fishes and play an important role in their conservation. The effects of large flooding events on headwater fish assemblages are under studied in southern Africa. In January 2012, heavy rainfall resulted in a large flood in the upper Klaserie River, Olifants River, and Limpopo River System, South Africa. This flood had an estimated return level of 225 years and caused significant ecological and economic damage. This study aimed to explore the impact of a large flood on the fish assemblage and substrate in the headwaters of a subtropical stream. The fish communities and selected substrate variables were collected at 10 sites. Sites were sampled at six monthly intervals thrice before and thrice after the flood. Fish were collected by electrofishing and substrate quantified visually. Changes in habitat resulted from the flood included the scouring of gravel sand and mud, greater exposure of bedrock and boulder substrates, increased stream width, and decreased stream depth in all zones. The fish community showed an increase in abundance for all but three species, colonisation of upstream sites, and colonisation of the study area by six species. The majority of fish species have opportunistic life‐history traits, which could explain the rapid colonisation and increase in abundance. The flood occurred in the middle of the breeding season for most the fish species, and this resulted in an increase of abundance for these species and provided opportunities for upstream colonisation. The impact of late season and aseasonal large floods requires further study. [ABSTRACT FROM AUTHOR]

Published
2024
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8. Interactive Machine Learning Solutions for Acoustic Monitoring of Animal Wildlife in Biosphere Reserves

Author

S. Gouvêa, Thiago, primary, Kath, Hannes, additional, Troshani, Ilira, additional, Lüers, Bengt, additional, Serafini, Patricia P., additional, Campos, Ivan B., additional, Afonso, André S., additional, Leandro, Sergio M. F. M., additional, Swanepoel, Lourens, additional, Theron, Nicholas, additional, Swemmer, Anthony M., additional, and Sonntag, Daniel, additional

Published
2023
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9. Precipitation gradients drive high tree species turnover in the woodlands of eastern and southern Africa

Author

Davies, Robert W., primary, Ryan, Casey M., additional, Harrison, Rhett D., additional, Dexter, Kyle G., additional, Ahrends, Antje, additional, te Beest, Mariska, additional, Benitez, Lorena, additional, Brade, Thom K., additional, Carreiras, Joao M. B., additional, Druce, Dave J., additional, Fayolle, Adeline, additional, Finckh, Manfred, additional, Godlee, John L., additional, Gonclaves, Francisco M., additional, Grundy, Isla M., additional, Hoche, T., additional, Holdo, Ricardo M., additional, Makungwa, Steve, additional, McNicol, Iain M., additional, Mograbi, Penelope J., additional, Muchawona, Anderson, additional, Muhate, Aristidies, additional, Muledi, Jonathan, additional, Pritchard, Rose, additional, Revermann, Rasmus, additional, Ribeiro, Natasha S., additional, Siampale, Abel, additional, Carla Staver, A., additional, Syampungani, Stephen, additional, Williams, Mathew, additional, Swemmer, Anthony M., additional, and Edwards, David P., additional

Published
2023
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10. Plant diversity in secondary, montane grasslands - a case study of the abandoned plantations of Mariepskop Mountain, South Africa.

Author

Swemmer, Anthony M., Lerm, Rion E., Thompson, Dave I., Graf, Jan A., Stone, Lynne, and Mashele, Mightyman

Subjects
PLANT diversity, GRASSLANDS, GRASSLAND conservation, GRASSLAND restoration, ENDANGERED ecosystems, COINCIDENCE, CONSERVATION & restoration
Abstract

Grasslands are one of the most threatened terrestrial ecosystem types, and montane grasslands of particular conservation concern. Despite high rates of transformation in recent decades, croplands and plantations are being abandoned in parts of many countries, creating an opportunity for conservation of montane grasslands through restoration. We report on the changes in the cover of major vegetation types (indigenous forest, grassland, and plantations) between 1935 and 2022, in an area that was intensively afforested from 1930 to 1960 and abandoned in 2000. Montane grassland at the site declined from over 50% of all landcover to below 15%, but subsequently recovered to 30% within 20 years. Many former plantations developed into secondary grassland with estimated gamma plant species richness of 231 for herbaceous species and 45 for savanna species. These are high values considering the size of the study area (4000 ha), and comparable to estimates from primary grassland sites in the broader region. However, at the scale of 1 m² sampling quadrats, richness in the secondary grasslands was below that recorded in the last remaining patches of primary grassland at the site (means of 2.6 versus 4.7 for graminoid species, and 1.9 versus 2.9 for forbs). Some of the former Eucalyptus plantations had transformed into novel savannas dominated by firetolerant, resprouting trees, and may require more active restoration. Secondary grasslands such as those reported on here could potentially make a significant contribution to the conservation of montane biodiversity over the coming decades, warranting further research (both socio-economic and ecological) on the factors that lead to abandonment and promote the emerge of secondary grasslands of high diversity. [ABSTRACT FROM AUTHOR]

Published
2024
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11. Precipitation gradients drive high tree species turnover in the woodlands of eastern and southern Africa

Author

Davies, Robert W., Ryan, Casey, Harrison, Rhett D., Dexter, Kyle, Ahrends, Antje, Beest, Marisa te, Benitez, Lorena, Brade, Thom, Carreiras, Joao M. B., Druce, Dave J., Fayolle, Adeline, Finckh, Manfred, Godlee, John, Gonclaves, Francisco M., Grundy, Isla, Hoche, T., Holdo, Ricardo M., Makungwa, Steve, McNicol, Iain, Mograbi, Penelope J., Muchawona, Anderson, Muhate, Aristidies, Muledi, Jonathan, Pritchard, Rose, Revermann, Rasmus, Ribeiro, Natasha S., Siampale, Abel, Staver, A. Carla, Syampungani, Stephen, Williams, Mathew, Swemmer, Anthony M., and Edwards, David P.

Abstract

Savannas cover one-fifth of the Earth's surface, harbour substantial biodiversity, and provide a broad range of ecosystem services to hundreds of millions of people. The community composition of trees in tropical moist forests varies with climate, but whether the same processes structure communities in disturbance-driven savannas remains relatively unknown. We investigate how biodiversity is structured over large environmental and disturbance gradients in woodlands of eastern and southern Africa. We use tree inventory data from the Socio-Ecological Observatory for Studying African Woodlands (SEOSAW) network, covering 755 ha in a total of 6780 plots across nine countries of eastern and southern Africa, to investigate how alpha, beta, and phylogenetic diversity varies across environmental and disturbance gradients. We find strong climate-richness patterns, with precipitation playing a primary role in determining patterns of tree richness and high turnover across these savannas. Savannas with greater rainfall contain more tree species, suggesting that low water availability places distributional limits on species, creating the observed climate-richness patterns. Both fire and herbivory have minimal effects on tree diversity, despite their role in determining savanna distribution and structure. High turnover of tree species, genera, and families is similar to turnover in seasonally dry tropical forests of the Americas, suggesting this is a feature of semiarid tree floras. The greater richness and phylogenetic diversity of wetter plots shows that broad-scale ecological patterns apply to disturbance-driven savanna systems. High taxonomic turnover suggests that savannas from across the regional rainfall gradient should be protected if we are to maximise the conservation of unique tree communities.

Published
2023
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12. Grazing and ecosystem service delivery in global drylands

Author

European Research Council, Generalitat Valenciana, Alexander von Humboldt Foundation, German Centre for Integrative Biodiversity Research, German Research Foundation, European Commission, Asia Foundation, Fundação para a Ciência e a Tecnologia (Portugal), Ministerio de Ciencia e Innovación (España), Comunidad de Madrid, Northern Arizona University, Consejo Nacional de Ciencia y Tecnología (México), Ministério da Ciência, Tecnologia e Inovação (Brasil), National Science Foundation (US), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), National Research Foundation (South Africa), Federal Ministry of Education and Research (Germany), Natural Sciences and Engineering Research Council of Canada, Australian Research Council, Agencia Estatal de Investigación (España), Junta de Andalucía, National Natural Science Foundation of China, Universidad Nacional de Río Negro, Junta de Extremadura, Ferdowsi University of Mashhad, Environmental Investment Fund of Namibia, Taylor Family Foundation, Maestre, Fernando T. [0000-0002-7434-4856], Delgado-Baquerizo, Manuel [0000-0002-6499-576X], Eldridge, David J. [0000-0002-2191-486X], Berdugo, Miguel [0000-0003-1053-8907], Gozalo, Beatriz [0000-0003-3082-4695], Ochoa, Victoria [0000-0002-2055-2094], Guirado, Emilio [0000-0001-5348-7391], García-Gómez, Miguel [0000-0003-3148-1495], Valencia, Enrique [0000-0003-3359-0759], Gaitán, Juan J. [0000-0003-2889-1418], Deák, Balázs [0000-0001-6938-1997], Donoso, David [0000-0002-3408-1457], Erdenetsetseg, Batdegleg [0000-0002-4508-8929], Espinosa, Carlos Iván [0000-0002-5330-4505], Fajardo, Alex [0000-0002-2202-6207], Farzam, Mohammad [0000-0003-1947-0187], Ferrante, Daniela [0000-0002-6056-3839], Frank, Anke S. K. [0000-0002-0177-4898], Fraser, L. H. [0000-0003-3998-5540], Jeltsch, Florian [0000-0002-4670-6469], Gherardi, Laureano [0000-0001-5743-1096], Greenville, Aaron [0000-0002-0113-4778], Guerra, Carlos A. [0000-0003-4917-2105], Gusmán Montalván, Elizabeth [0000-0002-3103-0419], Hernández Hernández, Rosa M. [0000-0003-0689-8862], Huber-Sannwald, E. [0000-0002-8321-1270], Hughes, Frederic M. [0000-0002-5835-953X], Jadán, Oswaldo. [0000-0002-7865-2418], Jentsch, Anke [0000-0002-2345-8300], Kaseke, Kudzai Farai [0000-0002-3856-0711], Köbel, Melanie [0000-0001-8272-7999], Koopman, Jesica E. [0000-0002-7944-7969], Leder, Cintia [0000-0003-4829-4477], Linstädter, Anja [0000-0003-0038-9557], Le Roux, Peter C. [0000-0002-7941-7444], Liancourt, Pierre [0000-0002-3109-8755], Liu, Jushan [0000-0001-7768-914X], Munson, Seth M. [0000-0002-2736-6374], Low, Michelle A. [0000-0002-2148-9752], Maggs Kölling, Gillian [0000-0003-3296-8553], Makhalanyane, Thulani P. [0000-0002-8173-1678], Malam Issa, Oumarou [0000-0001-8357-914X], Manzaneda, Antonio J. [0000-0001-9384-7910], Marais, Eugene [0000-0001-7155-9942], Mora, Juan P. [0000-0002-6335-0150], Moreno, Gerardo [0000-0001-8053-2696], Nunes, Alice [0000-0002-6900-3838], Oliva, Gabriel [0000-0002-7839-8851], Oñatibia, Gastón [0000-0003-2329-6601], Peter, Guadalupe [0000-0002-7792-7045], Pivari, Marco O. D. [0000-0003-1764-4577], Pueyo, Yolanda [0000-0001-6970-7790], Quiroga, R Emiliano [0000-0001-9785-451X], Reed, Sasha C. [0000-0002-8597-8619], Rey, P.J. [0000-0001-5550-0393], Teixido, Alberto L. [0000-0001-8009-1237], Richard, Benoit [0000-0003-4522-027X], Rodríguez, Alexandra [0000-0001-5849-8778], Rolo, Víctor [0000-0001-5854-9512], Rubalcaba, Juan G. [0000-0003-4646-070X], Salah, Ayman [0000-0003-0596-1292], Stavi, Ilan [0000-0001-9725-0003], Stephens, Colton R. A. [0000-0002-8744-6405], Swemmer, Anthony [0000-0003-1378-7394], Thomas, Andrew [0000-0002-1360-1687], Throop, Heather L. [0000-0002-7963-4342], Travers, Samantha [0000-0002-6252-1667], Val, James [0000-0003-4519-4008], Valkó, Orsolya [0000-0001-7919-6293], van den Brink, Liesbeth [0000-0003-0313-8147], Velasco Ayuso, Sergio [0000-0002-5924-8786], Velbert, Frederike [0000-0003-0499-3807], Wamiti, Wanyoike [0000-0001-7300-2101], Asencio, Sergio [0000-0003-4376-2964], Wang, Deli [0000-0001-6576-9193], Wang, Lixin [0000-0003-0968-1247], Wardle, Glenda M. [0000-0003-0189-1899], Yahdjian, Laura [0000-0002-9635-1221], Zaady, Eli [0000-0002-3304-534X], Yuanming, Zhang [0000-0003-1370-4181], Singh, Brajesh K. [0000-0003-4413-4185], Gross, Nicolas [0000-0001-9730-3240], Mendoza, Betty [0000-0003-1149-7801], Plaza de Carlos, César [0000-0001-8616-7001], Rey, Ana [0000-0003-0394-101X], Hu, Hang-Wei [0000-0002-3294-102X], He, Ji-Zheng [0000-0002-9169-8058], Wang, Jun-Tao [0000-0002-1822-2176], Lehmann, Anika [0000-0002-9101-9297], Rillig, Matthias C. [0000-0003-3541-7853], Cesarz, Simone [0000-0003-2334-5119], Eisenhauer, Nico [0000-0002-0371-6720], Martínez-Valderrama, Jaime [0000-0001-5859-5674], Moreno-Jiménez, Eduardo [0000-0002-2125-1197], Salas, O. [0000-0003-0142-9450], Abedi, Mehdi [0000-0002-1499-0119], Ahmadian , Negar [0000-0003-1191-3019], Alados, Concepción L. [0000-0002-6227-861X], Aramayo, Valeria [0000-0003-4827-6914], Amghar, Fateh [0000-0003-0379-7273], Arredondo, Tulio [0000-0003-1969-9942], Ahumada, Rodrigo J. [0000-0002-7246-4459], Bahalkeh, Khadijeh [0000-0003-1485-0316], Salem, Farah Ben [0000-0001-6100-9496], Blaum, Niels [0000-0001-6807-5162], Boldgiv, Bazartseren [0000-0003-0015-8142], Browker, Matthew A. [0000-0002-5891-0264], Bran, Donaldo [0000-0001-7749-2726], Bu, Chongfeng [0000-0002-5839-7229], Canessa, Rafaella [0000-0002-6979-9880], Castro, Helena [0000-0003-1818-1535], Castro, Ignacio [0000-0002-7594-6824], Castro-Quezada, Patricio [0000-0002-2366-2256], Conceição, Abel A. [0000-0001-7461-0133], Currier, Courtney M. [0000-0002-7617-239X], Darrouzet-Nardi, Anthony [0000-0002-2825-7962], Dougill, Andrew [0000-0002-3422-8228], Maestre, Fernando T., Le Bagousse-Pinguet, Yoann, Delgado-Baquerizo, Manuel, Eldridge, David J., Sáiz, Hugo, Berdugo, Miguel, Gozalo, Beatriz, Ochoa, Victoria, Guirado, Emilio, García-Gómez, Miguel, Valencia, Enrique, Zhou, Xiaobing, Singh, Brajesh K., Gross, Nicolas, Mendoza, Betty, Plaza de Carlos, César, Díaz-Martínez, Paloma, Rey, Ana, Hu, Hang-Wei, He, Ji-Zheng, Wang, Jun-Tao, Bu, Chongfeng, Lehmann, Anika, Rillig, Matthias C., Cesarz, Simone, Eisenhauer, Nico, Martínez-Valderrama, Jaime, Moreno-Jiménez, Eduardo, Salas, O., Abedi, Mehdi, Ahmadian , Negar, Alados, Concepcion L., Canessa, Rafaella, Aramayo, Valeria, Amghar, Fateh, Arredondo, Tulio, Ahumada, Rodrigo J., Bahalkeh, Khadijeh, Salem, Farah Ben, Blaum, Niels, Boldgiv, Bazartseren, Browker, Matthew A., Bran, Donaldo, Castillo-Monroy, Andrea P., Castro, Helena, Castro, Ignacio, Castro-Quezada, Patricio, Chibani, Roukaya, Conceição, Abel A., Currier, Courtney M., Darrouzet-Nardi, Anthony, Jeltsch, Florian, Deák, Balázs, Donoso, David, Dougill, Andrew, Durán, Jorge, Erdenetsetseg, Batdegleg, Espinosa, Carlos Iván, Fajardo, Alex, Farzam, Mohammad, Ferrante, Daniela, Frank, Anke S. K., Jentsch, Anke, Fraser, L. H., Gherardi, Laureano, Greenville, Aaron, Guerra, Carlos A., Gusmán Montalván, Elizabeth, Hernández Hernández, Rosa M., Hölzel, Norbert, Huber-Sannwald, E., Hughes, Frederic M., Jadán, Oswaldo, Kaseke, Kudzai Farai, Köbel, Melanie, Koopman, Jesica E., Leder, Cintia, Linstädter, Anja, Le Roux, Peter C., Li, Xinkai, Liancourt, Pierre, Rodríguez-Pereiras, Alexandra, Liu, Jushan, Low, Michelle A., Maggs Kölling, Gillian, Makhalanyane, Thulani P., Malam Issa, Oumarou, Manzaneda, Antonio J., Marais, Eugene, Mora, Juan P., Moreno, Gerardo, Munson, Seth M., Rolo, Víctor, Nunes, Alice, Oliva, Gabriel, Oñatibia, Gastón, Pivari, Marco O. D., Pueyo, Yolanda, Quiroga, R Emiliano, Rahmanian, Soroor, Reed, Sasha C., Rey, P.J., Richard, Benoit, Rubalcaba, Juan G., Ruppert, Jan C., Salah, Ayman, Schuchardt, Max A., Spann, Sedona, Stavi, Ilan, Stephens, Colton R. A., Swemmer, Anthony, Gaitán, Juan J., Teixido, Alberto L., Thomas, Andrew, Throop, Heather L., Tielbörger, Katja, Travers, Samantha, Val, James, Valkó, Orsolya, van den Brink, Liesbeth, Velasco Ayuso, Sergio, Velbert, Frederike, Asencio, Sergio, Wamiti, Wanyoike, Wang, Deli, Wang, Lixin, Wardle, Glenda M., Yahdjian, Laura, Zaady, Eli, Yuanming, Zhang, European Research Council, Generalitat Valenciana, Alexander von Humboldt Foundation, German Centre for Integrative Biodiversity Research, German Research Foundation, European Commission, Asia Foundation, Fundação para a Ciência e a Tecnologia (Portugal), Ministerio de Ciencia e Innovación (España), Comunidad de Madrid, Northern Arizona University, Consejo Nacional de Ciencia y Tecnología (México), Ministério da Ciência, Tecnologia e Inovação (Brasil), National Science Foundation (US), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), National Research Foundation (South Africa), Federal Ministry of Education and Research (Germany), Natural Sciences and Engineering Research Council of Canada, Australian Research Council, Agencia Estatal de Investigación (España), Junta de Andalucía, National Natural Science Foundation of China, Universidad Nacional de Río Negro, Junta de Extremadura, Ferdowsi University of Mashhad, Environmental Investment Fund of Namibia, Taylor Family Foundation, Maestre, Fernando T. [0000-0002-7434-4856], Delgado-Baquerizo, Manuel [0000-0002-6499-576X], Eldridge, David J. [0000-0002-2191-486X], Berdugo, Miguel [0000-0003-1053-8907], Gozalo, Beatriz [0000-0003-3082-4695], Ochoa, Victoria [0000-0002-2055-2094], Guirado, Emilio [0000-0001-5348-7391], García-Gómez, Miguel [0000-0003-3148-1495], Valencia, Enrique [0000-0003-3359-0759], Gaitán, Juan J. [0000-0003-2889-1418], Deák, Balázs [0000-0001-6938-1997], Donoso, David [0000-0002-3408-1457], Erdenetsetseg, Batdegleg [0000-0002-4508-8929], Espinosa, Carlos Iván [0000-0002-5330-4505], Fajardo, Alex [0000-0002-2202-6207], Farzam, Mohammad [0000-0003-1947-0187], Ferrante, Daniela [0000-0002-6056-3839], Frank, Anke S. K. [0000-0002-0177-4898], Fraser, L. H. [0000-0003-3998-5540], Jeltsch, Florian [0000-0002-4670-6469], Gherardi, Laureano [0000-0001-5743-1096], Greenville, Aaron [0000-0002-0113-4778], Guerra, Carlos A. [0000-0003-4917-2105], Gusmán Montalván, Elizabeth [0000-0002-3103-0419], Hernández Hernández, Rosa M. [0000-0003-0689-8862], Huber-Sannwald, E. [0000-0002-8321-1270], Hughes, Frederic M. [0000-0002-5835-953X], Jadán, Oswaldo. [0000-0002-7865-2418], Jentsch, Anke [0000-0002-2345-8300], Kaseke, Kudzai Farai [0000-0002-3856-0711], Köbel, Melanie [0000-0001-8272-7999], Koopman, Jesica E. [0000-0002-7944-7969], Leder, Cintia [0000-0003-4829-4477], Linstädter, Anja [0000-0003-0038-9557], Le Roux, Peter C. [0000-0002-7941-7444], Liancourt, Pierre [0000-0002-3109-8755], Liu, Jushan [0000-0001-7768-914X], Munson, Seth M. [0000-0002-2736-6374], Low, Michelle A. [0000-0002-2148-9752], Maggs Kölling, Gillian [0000-0003-3296-8553], Makhalanyane, Thulani P. [0000-0002-8173-1678], Malam Issa, Oumarou [0000-0001-8357-914X], Manzaneda, Antonio J. [0000-0001-9384-7910], Marais, Eugene [0000-0001-7155-9942], Mora, Juan P. [0000-0002-6335-0150], Moreno, Gerardo [0000-0001-8053-2696], Nunes, Alice [0000-0002-6900-3838], Oliva, Gabriel [0000-0002-7839-8851], Oñatibia, Gastón [0000-0003-2329-6601], Peter, Guadalupe [0000-0002-7792-7045], Pivari, Marco O. D. [0000-0003-1764-4577], Pueyo, Yolanda [0000-0001-6970-7790], Quiroga, R Emiliano [0000-0001-9785-451X], Reed, Sasha C. [0000-0002-8597-8619], Rey, P.J. [0000-0001-5550-0393], Teixido, Alberto L. [0000-0001-8009-1237], Richard, Benoit [0000-0003-4522-027X], Rodríguez, Alexandra [0000-0001-5849-8778], Rolo, Víctor [0000-0001-5854-9512], Rubalcaba, Juan G. [0000-0003-4646-070X], Salah, Ayman [0000-0003-0596-1292], Stavi, Ilan [0000-0001-9725-0003], Stephens, Colton R. A. [0000-0002-8744-6405], Swemmer, Anthony [0000-0003-1378-7394], Thomas, Andrew [0000-0002-1360-1687], Throop, Heather L. [0000-0002-7963-4342], Travers, Samantha [0000-0002-6252-1667], Val, James [0000-0003-4519-4008], Valkó, Orsolya [0000-0001-7919-6293], van den Brink, Liesbeth [0000-0003-0313-8147], Velasco Ayuso, Sergio [0000-0002-5924-8786], Velbert, Frederike [0000-0003-0499-3807], Wamiti, Wanyoike [0000-0001-7300-2101], Asencio, Sergio [0000-0003-4376-2964], Wang, Deli [0000-0001-6576-9193], Wang, Lixin [0000-0003-0968-1247], Wardle, Glenda M. [0000-0003-0189-1899], Yahdjian, Laura [0000-0002-9635-1221], Zaady, Eli [0000-0002-3304-534X], Yuanming, Zhang [0000-0003-1370-4181], Singh, Brajesh K. [0000-0003-4413-4185], Gross, Nicolas [0000-0001-9730-3240], Mendoza, Betty [0000-0003-1149-7801], Plaza de Carlos, César [0000-0001-8616-7001], Rey, Ana [0000-0003-0394-101X], Hu, Hang-Wei [0000-0002-3294-102X], He, Ji-Zheng [0000-0002-9169-8058], Wang, Jun-Tao [0000-0002-1822-2176], Lehmann, Anika [0000-0002-9101-9297], Rillig, Matthias C. [0000-0003-3541-7853], Cesarz, Simone [0000-0003-2334-5119], Eisenhauer, Nico [0000-0002-0371-6720], Martínez-Valderrama, Jaime [0000-0001-5859-5674], Moreno-Jiménez, Eduardo [0000-0002-2125-1197], Salas, O. [0000-0003-0142-9450], Abedi, Mehdi [0000-0002-1499-0119], Ahmadian , Negar [0000-0003-1191-3019], Alados, Concepción L. [0000-0002-6227-861X], Aramayo, Valeria [0000-0003-4827-6914], Amghar, Fateh [0000-0003-0379-7273], Arredondo, Tulio [0000-0003-1969-9942], Ahumada, Rodrigo J. [0000-0002-7246-4459], Bahalkeh, Khadijeh [0000-0003-1485-0316], Salem, Farah Ben [0000-0001-6100-9496], Blaum, Niels [0000-0001-6807-5162], Boldgiv, Bazartseren [0000-0003-0015-8142], Browker, Matthew A. [0000-0002-5891-0264], Bran, Donaldo [0000-0001-7749-2726], Bu, Chongfeng [0000-0002-5839-7229], Canessa, Rafaella [0000-0002-6979-9880], Castro, Helena [0000-0003-1818-1535], Castro, Ignacio [0000-0002-7594-6824], Castro-Quezada, Patricio [0000-0002-2366-2256], Conceição, Abel A. [0000-0001-7461-0133], Currier, Courtney M. [0000-0002-7617-239X], Darrouzet-Nardi, Anthony [0000-0002-2825-7962], Dougill, Andrew [0000-0002-3422-8228], Maestre, Fernando T., Le Bagousse-Pinguet, Yoann, Delgado-Baquerizo, Manuel, Eldridge, David J., Sáiz, Hugo, Berdugo, Miguel, Gozalo, Beatriz, Ochoa, Victoria, Guirado, Emilio, García-Gómez, Miguel, Valencia, Enrique, Zhou, Xiaobing, Singh, Brajesh K., Gross, Nicolas, Mendoza, Betty, Plaza de Carlos, César, Díaz-Martínez, Paloma, Rey, Ana, Hu, Hang-Wei, He, Ji-Zheng, Wang, Jun-Tao, Bu, Chongfeng, Lehmann, Anika, Rillig, Matthias C., Cesarz, Simone, Eisenhauer, Nico, Martínez-Valderrama, Jaime, Moreno-Jiménez, Eduardo, Salas, O., Abedi, Mehdi, Ahmadian , Negar, Alados, Concepcion L., Canessa, Rafaella, Aramayo, Valeria, Amghar, Fateh, Arredondo, Tulio, Ahumada, Rodrigo J., Bahalkeh, Khadijeh, Salem, Farah Ben, Blaum, Niels, Boldgiv, Bazartseren, Browker, Matthew A., Bran, Donaldo, Castillo-Monroy, Andrea P., Castro, Helena, Castro, Ignacio, Castro-Quezada, Patricio, Chibani, Roukaya, Conceição, Abel A., Currier, Courtney M., Darrouzet-Nardi, Anthony, Jeltsch, Florian, Deák, Balázs, Donoso, David, Dougill, Andrew, Durán, Jorge, Erdenetsetseg, Batdegleg, Espinosa, Carlos Iván, Fajardo, Alex, Farzam, Mohammad, Ferrante, Daniela, Frank, Anke S. K., Jentsch, Anke, Fraser, L. H., Gherardi, Laureano, Greenville, Aaron, Guerra, Carlos A., Gusmán Montalván, Elizabeth, Hernández Hernández, Rosa M., Hölzel, Norbert, Huber-Sannwald, E., Hughes, Frederic M., Jadán, Oswaldo, Kaseke, Kudzai Farai, Köbel, Melanie, Koopman, Jesica E., Leder, Cintia, Linstädter, Anja, Le Roux, Peter C., Li, Xinkai, Liancourt, Pierre, Rodríguez-Pereiras, Alexandra, Liu, Jushan, Low, Michelle A., Maggs Kölling, Gillian, Makhalanyane, Thulani P., Malam Issa, Oumarou, Manzaneda, Antonio J., Marais, Eugene, Mora, Juan P., Moreno, Gerardo, Munson, Seth M., Rolo, Víctor, Nunes, Alice, Oliva, Gabriel, Oñatibia, Gastón, Pivari, Marco O. D., Pueyo, Yolanda, Quiroga, R Emiliano, Rahmanian, Soroor, Reed, Sasha C., Rey, P.J., Richard, Benoit, Rubalcaba, Juan G., Ruppert, Jan C., Salah, Ayman, Schuchardt, Max A., Spann, Sedona, Stavi, Ilan, Stephens, Colton R. A., Swemmer, Anthony, Gaitán, Juan J., Teixido, Alberto L., Thomas, Andrew, Throop, Heather L., Tielbörger, Katja, Travers, Samantha, Val, James, Valkó, Orsolya, van den Brink, Liesbeth, Velasco Ayuso, Sergio, Velbert, Frederike, Asencio, Sergio, Wamiti, Wanyoike, Wang, Deli, Wang, Lixin, Wardle, Glenda M., Yahdjian, Laura, Zaady, Eli, and Yuanming, Zhang

Abstract

Grazing represents the most extensive use of land worldwide. Yet its impacts on ecosystem services remain uncertain because pervasive interactions between grazing pressure, climate, soil properties, and biodiversity may occur but have never been addressed simultaneously. Using a standardized survey at 98 sites across six continents, we show that interactions between grazing pressure, climate, soil, and biodiversity are critical to explain the delivery of fundamental ecosystem services across drylands worldwide. Increasing grazing pressure reduced ecosystem service delivery in warmer and species-poor drylands, whereas positive effects of grazing were observed in colder and species-rich areas. Considering interactions between grazing and local abiotic and biotic factors is key for understanding the fate of dryland ecosystems under climate change and increasing human pressure. Copyright © 2022 the authors

Published
2022

14. Precipitation gradients drive high tree species turnover in the woodlands of eastern and southern Africa

Author

Sustainability Science and Education, Spatial Ecology and Global Change, Environmental Sciences, Davies, Robert W., Ryan, Casey M., Harrison, Rhett D., Dexter, Kyle G., Ahrends, Antje, te Beest, Mariska, Benitez, Lorena, Brade, Thom K., Carreiras, Joao M. B., Druce, Dave J., Fayolle, Adeline, Finckh, Manfred, Godlee, John L., Gonclaves, Francisco M., Grundy, Isla M., Hoche, T., Holdo, Ricardo M., Makungwa, Steve, McNicol, Iain M., Mograbi, Penelope J., Muchawona, Anderson, Muhate, Aristidies, Muledi, Jonathan, Pritchard, Rose, Revermann, Rasmus, Ribeiro, Natasha S., Siampale, Abel, Carla Staver, A., Syampungani, Stephen, Williams, Mathew, Swemmer, Anthony M., Edwards, David P., Sustainability Science and Education, Spatial Ecology and Global Change, Environmental Sciences, Davies, Robert W., Ryan, Casey M., Harrison, Rhett D., Dexter, Kyle G., Ahrends, Antje, te Beest, Mariska, Benitez, Lorena, Brade, Thom K., Carreiras, Joao M. B., Druce, Dave J., Fayolle, Adeline, Finckh, Manfred, Godlee, John L., Gonclaves, Francisco M., Grundy, Isla M., Hoche, T., Holdo, Ricardo M., Makungwa, Steve, McNicol, Iain M., Mograbi, Penelope J., Muchawona, Anderson, Muhate, Aristidies, Muledi, Jonathan, Pritchard, Rose, Revermann, Rasmus, Ribeiro, Natasha S., Siampale, Abel, Carla Staver, A., Syampungani, Stephen, Williams, Mathew, Swemmer, Anthony M., and Edwards, David P.

Published
2023

15. Changes in biodiversity and trade-offs among ecosystem services, stakeholders, and components of well-being : the contribution of the International Long-Term Ecological Research network (ILTER) to Programme on Ecosystem Change and Society (PECS)

Author

Maass, Manuel, Balvanera, Patricia, Bourgeron, Patrick, Equihua, Miguel, Baudry, Jacques, Dick, Jan, Forsius, Martin, Halada, Lubos, Krauze, Kinga, Nakaoka, Masahiro, Orenstein, Daniel E., Parr, Terry W., Redman, Charles L., Rozzi, Ricardo, Santos-Reis, Margarida, Swemmer, Anthony M., and Vădineanu, Angheluta

Published
2016

16. Grazing and ecosystem service delivery in global drylands

Author

Maestre, Fernando T., Le Bagousse-Pinguet, Yoann, Delgado-Baquerizo, Manuel, Eldridge, David J., Saiz, Hugo, Berdugo, Miguel, Gozalo, Beatriz, Ochoa, Victoria, Guirado, Emilio, García-Gómez, Miguel, Valencia, Enrique, Gaitán, Juan J., Asensio, Sergio, Mendoza, Betty J., Plaza, César, Díaz-Martínez, Paloma, Rey, Ana, Hu, Hang-Wei, He, Ji-Zheng, Wang, Jun-Tao, Lehmann, Anika, Rillig, Matthias C., Cesarz, Simone, Eisenhauer, Nico, Martínez-Valderrama, Jaime, Moreno-Jiménez, Eduardo, Sala, Osvaldo, Abedi, Mehdi, Ahmadian, Negar, Alados, Concepción L., Aramayo, Valeria, Amghar, Fateh, Arredondo, Tulio, Ahumada, Rodrigo J., Bahalkeh, Khadijeh, Ben Salem, Farah, Blaum, Niels, Boldgiv, Bazartseren, Bowker, Matthew A., Bran, Donaldo, Bu, Chongfeng, Canessa, Rafaella, Castillo-Monroy, Andrea P., Castro, Helena, Castro, Ignacio, Castro-Quezada, Patricio, Chibani, Roukaya, Conceição, Abel A., Currier, Courtney M., Darrouzet-Nardi, Anthony, Deák, Balázs, Donoso, David A., Dougill, Andrew J., Durán, Jorge, Erdenetsetseg, Batdelger, Espinosa, Carlos I., Fajardo, Alex, Farzam, Mohammad, Ferrante, Daniela, Frank, Anke S. K., Fraser, Lauchlan H., Gherardi, Laureano A., Greenville, Aaron C., Guerra, Carlos A., Gusmán-Montalvan, Elizabeth, Hernández-Hernández, Rosa M., Hölzel, Norbert, Huber-Sannwald, Elisabeth, Hughes, Frederic M., Jadán-Maza, Oswaldo, Jeltsch, Florian, Jentsch, Anke, Kaseke, Kudzai F., Köbel, Melanie, Koopman, Jessica E., Leder, Cintia V., Linstädter, Anja, le Roux, Peter C., Li, Xinkai, Liancourt, Pierre, Liu, Jushan, Louw, Michelle A., Maggs-Kölling, Gillian, Makhalanyane, Thulani P., Issa, Oumarou Malam, Manzaneda, Antonio J., Marais, Eugene, Mora, Juan P., Moreno, Gerardo, Munson, Seth M., Nunes, Alice, Oliva, Gabriel, Oñatibia, Gastón R., Peter, Guadalupe, Pivari, Marco O. D., Pueyo, Yolanda, Quiroga, R. Emiliano, Rahmanian, Soroor, Reed, Sasha C., Rey, Pedro J., Richard, Benoit, Rodríguez, Alexandra, Rolo, Víctor, Rubalcaba, Juan G., Ruppert, Jan C., Salah, Ayman, Schuchardt, Max A., Spann, Sedona, Stavi, Ilan, Stephens, Colton R. A., Swemmer, Anthony M., Teixido, Alberto L., Thomas, Andrew D., Throop, Heather L., Tielbörger, Katja, Travers, Samantha, Val, James, Valkó, Orsolya, van den Brink, Liesbeth, Ayuso, Sergio Velasco, Velbert, Frederike, Wamiti, Wanyoike, Wang, Deli, Wang, Lixin, Wardle, Glenda M., Yahdjian, Laura, Zaady, Eli, Zhang, Yuanming, Zhou, Xiaobing, Singh, Brajesh K., Gross, Nicolas, Universidad de Alicante, Instituto de Recursos Naturales y Agrobiología de Sevilla (IRNAS), Consejo Superior de Investigaciones Científicas [Madrid] (CSIC), University of New South Wales [Sydney] (UNSW), University of Zaragoza - Universidad de Zaragoza [Zaragoza], Eidgenössische Technische Hochschule - Swiss Federal Institute of Technology [Zürich] (ETH Zürich), Université d'Alicante, Espagne (UA), Universidad Politécnica de Madrid (UPM), Chinese Academy of Agricultural Sciences (CAAS), Université Clermont Auvergne (UCA), Unité Mixte de Recherche sur l'Ecosystème Prairial - UMR (UREP), VetAgro Sup - Institut national d'enseignement supérieur et de recherche en alimentation, santé animale, sciences agronomiques et de l'environnement (VAS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), European Research Council, Generalitat Valenciana, Alexander von Humboldt Foundation, German Centre for Integrative Biodiversity Research, German Research Foundation, European Commission, Asia Foundation, Fundação para a Ciência e a Tecnologia (Portugal), Ministerio de Ciencia e Innovación (España), Comunidad de Madrid, Northern Arizona University, Consejo Nacional de Ciencia y Tecnología (México), Ministério da Ciência, Tecnologia e Inovação (Brasil), National Science Foundation (US), Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (Brasil), National Research Foundation (South Africa), Federal Ministry of Education and Research (Germany), Natural Sciences and Engineering Research Council of Canada, Australian Research Council, Agencia Estatal de Investigación (España), Junta de Andalucía, National Natural Science Foundation of China, Universidad Nacional de Río Negro, Junta de Extremadura, Ferdowsi University of Mashhad, Environmental Investment Fund of Namibia, Taylor Family Foundation, Maestre, Fernando T., Delgado-Baquerizo, Manuel, Eldridge, David J., Sáiz, Hugo, Berdugo, Miguel, Gozalo, Beatriz, Ochoa, Victoria, Guirado, Emilio, García-Gómez, Miguel, Valencia, Enrique, Gaitán, Juan J., Deák, Balázs, Donoso, David, Dougill, Andrew, Erdenetsetseg, Batdegleg, Espinosa, Carlos Iván, Fajardo, Alex, Farzam, Mohammad, Ferrante, Daniela, Frank, Anke S. K., fraser, Lauchlan, Jeltsch, Florian, Gherardi, Laureano, Greenville, Aaron, Guerra, Carlos A., Gusmán Montalván, Elizabeth, Hernández Hernández, Rosa M., Huber-Sannwald, E., Hughes, Frederic M., Jadán-Maza, O., Jentsch, Anke, Kaseke, Kudzai Farai, Köbel, Melanie, Koopman, Jesica E., Leder, Cintia, Linstädter, Anja, Le Roux, Peter C., Liancourt, Pierre, Liu, Jushan, Munson, Seth M., Low, Michelle A., Maggs Kölling, Gillian, Makhalanyane, Thulani P.7, Malam Issa, Oumarou7, Manzaneda, Antonio J., Marais, Eugene, Mora, Juan P., Moreno, Gerardo, Nunes, Alice, Oliva, Gabriel, Oñatibia, Gastón, Peter, Guadalupe, Pivari, Marco O. D., Pueyo, Yolanda, Quiroga, R Emiliano, Reed, Sasha C., Rey, P.J., Teixido, Alberto L., Richard, Benoit, Rodríguez, Alexandra, Rolo, Víctor, Rubalcaba, Juan G., Salah, Ayman, Stavi, Ilan, Stephens, Colton R. A., Swemmer, Anthony, Thomas, Andrew, Throop, Heather L., Travers, Samantha, Val, James, Valkó, Orsolya, van den Brink, Liesbeth, Velasco Ayuso, Sergio, Velbert, Frederike, Wamiti, Wanyoike, Asencio, Sergio, Wang, Deli, Wang, Lixin, Wardle, Glenda M., Yahdjian, Laura, Zaady, Eli, Yuanming, Zhang, Singh, Brajesh K., Gross, Nicolas, Mendoza, Betty J., Plaza de Carlos, César, Rey, Ana, Hu, Hang-Wei, He, Ji-Zheng, Wang, Jun-Tao, Lehmann, Anika, Rillig, Matthias C., Cesarz, Simone, Eisenhauer, Nico, Martínez-Valderrama, Jaime, Moreno-Jiménez, Eduardo, Salas, O., Abedi, Mehdi, Ahmadian , Negar, Alados, Concepción L., Aramayo, Valeria, Amghar, Fateh, Arredondo, Tulio, Ahumada, Rodrigo J., Bahalkeh, Khadijeh, Salem, Farah Ben, Blaum, Niels, Boldgiv, Bazartseren, Browker, Matthew A., Bran, Donaldo, Bu, Chongfeng, Canessa, Rafaella, Castro, Helena, Castro, Ignacio, Castro-Quezada, Patricio, Conceição, Abel A., Currier, Courtney M., Darrouzet-Nardi, Anthony, Universidad de Alicante. Departamento de Ecología, Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio 'Ramón Margalef', Laboratorio de Ecología de Zonas Áridas y Cambio Global (DRYLAB), Institut méditerranéen de biodiversité et d'écologie marine et continentale (IMBE), Avignon Université (AU)-Aix Marseille Université (AMU)-Institut de recherche pour le développement [IRD] : UMR237-Centre National de la Recherche Scientifique (CNRS), Universidad Rey Juan Carlos [Madrid] (URJC), Centre d'Études Biologiques de Chizé - UMR 7372 (CEBC), La Rochelle Université (ULR)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE), and Repositório da Universidade de Lisboa

Subjects
Livestock, Multidisciplinary, Climate Change, Drylands, Systems, Wild, Biodiversity, 580 Plants (Botany), Soil, Grazing, [SDE]Environmental Sciences, Ecosystem services, Herbivory, Rangeland
Abstract

7 páginas.- 4 figuras.- 32 referencias.- Supplementary materials: science.org/doi/10.1126/science.abq4062 Materials and Methods Figs. S1 to S19 Tables S1 to S28 References (33–269) MDAR Reproducibility Checklist Movie S1.- Grazing represents the most extensive use of land worldwide. Yet its impacts on ecosystem services remain uncertain because pervasive interactions between grazing pressure, climate, soil properties, and biodiversity may occur but have never been addressed simultaneously. Using a standardized survey at 98 sites across six continents, we show that interactions between grazing pressure, climate, soil, and biodiversity are critical to explain the delivery of fundamental ecosystem services across drylands worldwide. Increasing grazing pressure reduced ecosystem service delivery in warmer and speciespoor drylands, whereas positive effects of grazing were observed in colder and species-rich areas. Considering interactions between grazing and local abiotic and biotic factors is key for understanding the fate of dryland ecosystems under climate change and increasing human pressure. Copyright © 2022 the authors, Grazing represents the most extensive use of land worldwide. Yet its impacts on ecosystem services remain uncertain because pervasive interactions between grazing pressure, climate, soil properties, and biodiversity may occur but have never been addressed simultaneously. Using a standardized survey at 98 sites across six continents, we show that interactions between grazing pressure, climate, soil, and biodiversity are critical to explain the delivery of fundamental ecosystem services across drylands worldwide. Increasing grazing pressure reduced ecosystem service delivery in warmer and species-poor drylands, whereas positive effects of grazing were observed in colder and species-rich areas. Considering interactions between grazing and local abiotic and biotic factors is key for understanding the fate of dryland ecosystems under climate change and increasing human pressure. Copyright © 2022 the authors, Funding: This research was funded by the European Research Council [ERC grant agreement 647038 (BIODESERT)] and Generalitat Valenciana (CIDEGENT/2018/ 041). F.T.M. acknowledges support from a Rei Jaume I Award, the Alexander von Humboldt Foundation, and the Synthesis Center (sDiv) of the German Centre for Integrative Biodiversity Research Halle–Jena–Leipzig (iDiv). C.A.G., S.C., and N.E. acknowledge support from iDiv and the Deutsche Forschungsgemeinschaft (DFG– FZT 118, 202548816; Flexpool proposal 34600850). Y.L.B.-P. was supported by a Marie Sklodowska-Curie Actions Individual Fellowship (MSCA-IF) within the European Program Horizon 2020 (DRYFUN Project 656035). N.G. was supported by CAP 20-25 (16-IDEX-0001) and the AgreenSkills+ fellowship program, which has received funding from the EU’s Seventh Framework Programme under grant agreement N° FP7-609398 (AgreenSkills+ contract). B.B. and B.E. were supported by the Taylor Family–Asia Foundation Endowed Chair in Ecology and Conservation Biology. J.D., A.Ro., and H.C. acknowledge support from the Fundação para a Ciência e a Tecnologia (IF/00950/ 2014 and 2020.03670.CEECIND, SFRH/BDP/108913/2015, and in the scope of the framework contract foreseen in the numbers 4-6 of the article 23, of the Decree-Law 57/2016, August 29, changed by Law 57/2017, July 19, respectively), as well as from the MCTES, FSE, UE, and the CFE (UIDB/04004/2020) research unit financed by Fundação para a Ciência e a Tecnologia/MCTES through national funds (PIDDAC). C.P. acknowledges support from the Spanish Ministry of Science and Innovation (ref. AGL201675762-R, AEI/FEDER, UE, and PID2020-116578RB-I00, MCIN/AEI/10.13039/501100011033) and the European Union’s Horizon 2020 Research and Innovation Programme under grant agreement no. 101000224. E.V. was funded by the 2017 program for attracting and retaining talent of Comunidad de Madrid (no. 2017‐T2/ AMB‐5406). M.A.B. acknowledges support from the School of Forestry and College of the Environment, Forestry and Natural Sciences of Northern Arizona University. E.H.-S. acknowledges support from the Consejo Nacional de Ciencia y Tecnología (SEP-CB-2015-01-251388, PN 2017-5036 and PRONAII 319059). F.M.H. acknowledges support from the National Council for Scientific and Technological Development (CNPq - PCI/INMA) of the Brazilian Ministry of Science, Technology and Innovation (MCTI, processes number 302381/2020-1). H.L.T. acknowledges support from the US National Science Foundation (NSF) (DEB 0953864). A.N. and M.K. acknowledge support from the Fundação para a Ciência e a Tecnologia (SFRH/BD/130274/2017, CEECIND/02453/2018/CP1534/CT0001, PTDC/ASP-SIL/7743/2020 and UIDB/00329/2020). A.A.C. acknowledges support from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) - Finance Code 001. J.E.K. and T.P.M. acknowledge the National Research Foundation of South Africa (grant no. 114412). F.J. and N.B. acknowledge support from the German Federal Ministry of Education and Research (BMBF) in the framework of the SPACES projects OPTIMASS (FKZ: 01LL1302A) and ORYCS (FKZ:01LL1804A). A.Li. and A.S.K.F. acknowledge support from the German Federal Ministry of Education and Research (BMBF) in the framework of the SPACES projects Limpopo Living Landscapes (FKZ: 01LL1304D) and SALLnet (FKZ: 01LL1802C). L.W. acknowledges support from the US NSF (EAR 1554894). L.H.F. acknowledges support from the Natural Sciences and Engineering Research Council of Canada Industrial Research Chair Program in Ecosystem Reclamation. S.C.R. acknowledges support from the US Geological Survey Ecosystems Mission Area and the US Bureau of Land Management. G.M.W. acknowledges support from the Australian Research Council. L.v.d.B. and K.T. acknowledge support from the German Research Foundation (DFG) priority research program SPP-1803 “EarthShape: Earth Surface Shaping by Biota” (TI 338/14-1). M.D.-B. acknowledges support from the Spanish Ministry of Science and Innovation for the I+D+i project PID2020-115813RA-I00 funded by MCIN/AEI/10.13039/501100011033. M.D.-B. is also supported by a project of the Fondo Europeo de Desarrollo Regional (FEDER) and the Consejería de Transformación Económica, Industria, Conocimiento y Universidades of the Junta de Andalucía (FEDER Andalucía 2014-2020 Objetivo temático “01 - Refuerzo de la investigación, el desarrollo tecnológico y la innovación”) associated with the research project P20_00879 (ANDABIOMA). P.J.R. and A.J.M. acknowledge support from Fondo Europeo de Desarrollo Regional through the FEDER Andalucía operative program, FEDER-UJA 1261180 project. A.F. thanks ANID PIA/BASAL FB210006 and Millennium Science Initiative Program NCN2021-050. A.J. acknowledges support from the Bavarian Research Alliance Germany (BayIntAn_UBT_2017_61). C.B. acknowledges the National Natural Science Foundation of China (grant no. 41971131). Biodiversity and ecosystem function research in the B.K.S. laboratory is funded by the Australian Research Council (DP210102081). Any use of trade, product, or firm names in this paper is for descriptive purposes only and does not imply endorsement by the US government. H.S. is supported by a María Zambrano fellowship funded by the Ministry of Universities and European Union-Next Generation plan. G.P. and C.V.L. acknowledge support from Universidad Nacional de Río Negro (PI 40-C-873 and 654). V.R. acknowledges support from the Regional Government of Extremadura (Spain) through a “Talento” fellowship (TA18022). M.F. acknowledges support from the Department of Range and Watershed Management, Ferdowsi University of Mashhad, Mashhad, Iran. Participation of recent graduates in collecting field data at four sites in Namibia was supported by a capacity building grant to Gobabeb–Namib Research Institute by the Environmental Investment Fund in Namibia.

Published
2022
Full Text
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19. Grazing and ecosystem service delivery in global drylands

Author

Universidad de Alicante. Departamento de Ecología, Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef", Maestre, Fernando T., Le Bagousse-Pinguet, Yoann, Delgado-Baquerizo, Manuel, Eldridge, David J., Saiz, Hugo, Berdugo, Miguel, Gozalo, Beatriz, Ochoa, Victoria, Guirado, Emilio, García-Gómez, Miguel, Valencia, Enrique, Arredondo, Tulio, Ahumada, Rodrigo J., Bahalkeh, Khadijeh, Ben Salem, Farah, Blaum, Niels, Bu, Chongfeng, Boldgiv, Bazartseren, Canessa, Rafaella, Castillo-Monroy, Andrea P., Castro, Helena, Guerra, Carlos A., Castro, Ignacio, Castro-Quezada, Patricio, Chibani, Roukaya, Conceição, Abel A., Jadán-Maza, Oswaldo, Currier, Courtney M., Darrouzet-Nardi, Anthony, Deák, Balázs, Donoso, David A., Dougill, Andrew J., Gusmán-Montalván, Elizabeth, Durán, Jorge, Erdenetsetseg, Batdelger, Espinosa, Carlos Iván, Fajardo, Alex, Farzam, Mohammad, Jeltsch, Florian, Ferrante, Daniela, Frank, Anke S.K., Fraser, Lauchlan H., Gherardi, Laureano A., Hernández-Hernández, Rosa M., Greenville, Aaron C., Hölzel, Norbert, Huber-Sannwald, Elisabeth, Jentsch, Anke, Hughes, Frederic M., Kaseke, Kudzai F., Köbel, Melanie, Koopman, Jessica E., Pivari, Marco O.D., Leder, Cintia V., Linstädter, Anja, le Roux, Peter C., Li, Xinkai, Richard, Benoit, Liancourt, Pierre, Liu, Jushan, Louw, Michelle A., Maggs-Kölling, Gillian, Makhalanyane, Thulani P., Pueyo, Yolanda, Malam Issa, Oumarou, Manzaneda, Antonio J., Marais, Eugene, Mora, Juan P., Moreno, Gerardo, Rodríguez, Alexandra, Munson, Seth M., Nunes, Alice, Oliva, Gabriel, Oñatibia, Gastón R., Quiroga, R. Emiliano, Peter, Guadalupe, Rahmanian, Soroor, Reed, Sasha C., Rolo, Víctor, Rey, Pedro J., Rubalcaba, Juan G., Ruppert, Jan C., Salah, Ayman, Yahdjian, Laura, Schuchardt, Max A., Spann, Sedona, Stavi, Ilan, Stephens, Colton R.A., Gaitán, Juan J., Swemmer, Anthony M., Teixido, Alberto L., Thomas, Andrew D., Throop, Heather L., Tielbörger, Katja, Zaady, Eli, Travers, Samantha K., Val, James, Valkó, Orsolya, van den Brink, Liesbeth, Velasco Ayuso, Sergio, Asensio, Sergio, Velbert, Frederike, Wamiti, Wanyoike, Wang, Deli, Wang, Lixin, Zhang, Yuanming, Wardle, Glenda M., Zhou, Xiaobing, Singh, Brajesh K., Mendoza, Betty J., Gross, Nicolas, Plaza, César, Díaz-Martínez, Paloma, Rey, Ana, Bowker, Matthew A., Hu, Hang-Wei, He, Ji-Zheng, Wang, Jun‐Tao, Lehmann, Anika, Rillig, Matthias C., Cesarz, Simone, Eisenhauer, Nico, Martínez-Valderrama, Jaime, Moreno Jiménez, Eduardo, Sala, Osvaldo, Bran, Donaldo E., Abedi, Mehdi, Ahmadian, Negar, Alados, Concepción L., Aramayo, Valeria, Amghar, Fateh, Universidad de Alicante. Departamento de Ecología, Universidad de Alicante. Instituto Multidisciplinar para el Estudio del Medio "Ramón Margalef", Maestre, Fernando T., Le Bagousse-Pinguet, Yoann, Delgado-Baquerizo, Manuel, Eldridge, David J., Saiz, Hugo, Berdugo, Miguel, Gozalo, Beatriz, Ochoa, Victoria, Guirado, Emilio, García-Gómez, Miguel, Valencia, Enrique, Arredondo, Tulio, Ahumada, Rodrigo J., Bahalkeh, Khadijeh, Ben Salem, Farah, Blaum, Niels, Bu, Chongfeng, Boldgiv, Bazartseren, Canessa, Rafaella, Castillo-Monroy, Andrea P., Castro, Helena, Guerra, Carlos A., Castro, Ignacio, Castro-Quezada, Patricio, Chibani, Roukaya, Conceição, Abel A., Jadán-Maza, Oswaldo, Currier, Courtney M., Darrouzet-Nardi, Anthony, Deák, Balázs, Donoso, David A., Dougill, Andrew J., Gusmán-Montalván, Elizabeth, Durán, Jorge, Erdenetsetseg, Batdelger, Espinosa, Carlos Iván, Fajardo, Alex, Farzam, Mohammad, Jeltsch, Florian, Ferrante, Daniela, Frank, Anke S.K., Fraser, Lauchlan H., Gherardi, Laureano A., Hernández-Hernández, Rosa M., Greenville, Aaron C., Hölzel, Norbert, Huber-Sannwald, Elisabeth, Jentsch, Anke, Hughes, Frederic M., Kaseke, Kudzai F., Köbel, Melanie, Koopman, Jessica E., Pivari, Marco O.D., Leder, Cintia V., Linstädter, Anja, le Roux, Peter C., Li, Xinkai, Richard, Benoit, Liancourt, Pierre, Liu, Jushan, Louw, Michelle A., Maggs-Kölling, Gillian, Makhalanyane, Thulani P., Pueyo, Yolanda, Malam Issa, Oumarou, Manzaneda, Antonio J., Marais, Eugene, Mora, Juan P., Moreno, Gerardo, Rodríguez, Alexandra, Munson, Seth M., Nunes, Alice, Oliva, Gabriel, Oñatibia, Gastón R., Quiroga, R. Emiliano, Peter, Guadalupe, Rahmanian, Soroor, Reed, Sasha C., Rolo, Víctor, Rey, Pedro J., Rubalcaba, Juan G., Ruppert, Jan C., Salah, Ayman, Yahdjian, Laura, Schuchardt, Max A., Spann, Sedona, Stavi, Ilan, Stephens, Colton R.A., Gaitán, Juan J., Swemmer, Anthony M., Teixido, Alberto L., Thomas, Andrew D., Throop, Heather L., Tielbörger, Katja, Zaady, Eli, Travers, Samantha K., Val, James, Valkó, Orsolya, van den Brink, Liesbeth, Velasco Ayuso, Sergio, Asensio, Sergio, Velbert, Frederike, Wamiti, Wanyoike, Wang, Deli, Wang, Lixin, Zhang, Yuanming, Wardle, Glenda M., Zhou, Xiaobing, Singh, Brajesh K., Mendoza, Betty J., Gross, Nicolas, Plaza, César, Díaz-Martínez, Paloma, Rey, Ana, Bowker, Matthew A., Hu, Hang-Wei, He, Ji-Zheng, Wang, Jun‐Tao, Lehmann, Anika, Rillig, Matthias C., Cesarz, Simone, Eisenhauer, Nico, Martínez-Valderrama, Jaime, Moreno Jiménez, Eduardo, Sala, Osvaldo, Bran, Donaldo E., Abedi, Mehdi, Ahmadian, Negar, Alados, Concepción L., Aramayo, Valeria, and Amghar, Fateh

Abstract

Grazing represents the most extensive use of land worldwide. Yet its impacts on ecosystem services remain uncertain because pervasive interactions between grazing pressure, climate, soil properties, and biodiversity may occur but have never been addressed simultaneously. Using a standardized survey at 98 sites across six continents, we show that interactions between grazing pressure, climate, soil, and biodiversity are critical to explain the delivery of fundamental ecosystem services across drylands worldwide. Increasing grazing pressure reduced ecosystem service delivery in warmer and species-poor drylands, whereas positive effects of grazing were observed in colder and species-rich areas. Considering interactions between grazing and local abiotic and biotic factors is key for understanding the fate of dryland ecosystems under climate change and increasing human pressure.

Published
2022

23. The Effect of Woody Encroachment on Evapotranspiration in a Semi-Arid Savanna.

Author

Aldworth, Tiffany A., Toucher, Michele L. W., Clulow, Alistair D., and Swemmer, Anthony M.

Subjects
EVAPOTRANSPIRATION, HYDROLOGIC cycle, WOODY plants, SOIL moisture, INDIGENOUS plants, SAVANNAS, HEAT flux
Abstract

Over the past century, increases in indigenous woody plant species, also known as woody encroachment (WE), has occurred in grasslands and savannas across the globe. While the impact on grassland and savanna composition and productivity has been well studied, little is known of the impacts on the hydrological cycle. WE may increase evapotranspiration (ET) losses, leading to reduced infiltration and ultimately reduced freshwater availability, which is of particular concern in arid and semi-arid areas. The aim of this study was to determine the effect of Colophospermum mopane (mopane) encroachment on ET in a semi-arid savanna located in South Africa. Mopane is widely distributed across southern Africa, and is one of the main encroaching species of the region. Following an assessment of the validity of two surface renewal approaches, SR1 and SRDT, against short eddy covariance campaigns for sensible heat flux estimation, the SR1 approach was used to estimate ET at an experimental woody plant clearing trial from November 2019 to July 2022. For the two drier years of the study, the removal of mopane trees had little effect on ET. However, for the wettest year of the study, the removal of mopane trees decreased ET by 12%, supporting the hypothesis that the conversion from grass dominance to woody dominance can increase ET. Annual ET exceeded annual rainfall in all 3 years, indicating that the vegetation supplements its water use with soil water that has accumulated during previous wet seasons, or that tree roots facilitate hydraulic lift of deep soil water, or groundwater, to depths within the rooting depth of both trees and grasses. Further research is needed to confirm the exact mechanism involved, and the consequences of this for groundwater and streamflow at landscape scales. [ABSTRACT FROM AUTHOR]

Published
2023
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24. Fire and herbivory drive fungal and bacterial communities through distinct above- and belowground mechanisms

Author

Vermeire, Marie-Liesse, Thoresen, J., Lennard, K., Vikram, S., Kirkman, K., Swemmer, Anthony, te Beest, Mariska, Siebert, F., Gordijn, P., Venter, Z., Brunel, Caroline, Wolfaard, G., Krumins, J.A., Cramer, M.D., Hawkins, H.J., Vermeire, Marie-Liesse, Thoresen, J., Lennard, K., Vikram, S., Kirkman, K., Swemmer, Anthony, te Beest, Mariska, Siebert, F., Gordijn, P., Venter, Z., Brunel, Caroline, Wolfaard, G., Krumins, J.A., Cramer, M.D., and Hawkins, H.J.

Abstract

Fire and herbivory are important natural disturbances in grassy biomes. Both drivers are likely to influence belowground microbial communities but no studies have unravelled the long-term impact of both fire and herbivory on bacterial and fungal communities. We hypothesized that soil bacterial communities change through disturbance-induced shifts in soil properties (e.g. pH, nutrients) while soil fungal communities change through vegetation modification (biomass and species composition). To test these ideas, we characterised soil physico-chemical properties (pH, acidity, C, N, P and exchangeable cations content, texture, bulk density, moisture), plant species richness and biomass, microbial biomass and bacterial and fungal community composition and diversity (using 16S and ITS rRNA amplicon sequencing, respectively) in six long-term (18 to 70 years) ecological research sites in South African savanna and grassland ecosystems. We found that fire and herbivory regimes profoundly modified soil physico-chemical properties, plant species richness and standing biomass. In all sites, an increase in woody biomass (ranging from 12 to 50%) was observed when natural disturbances were excluded. The intensity and direction of changes in soil properties were highly dependent on the topo-pedo-climatic context. Overall, fire and herbivory shaped bacterial and fungal communities through distinct driving forces: edaphic properties (including Mg, pH, Ca) for bacteria, and vegetation (herbaceous biomass and woody cover) for fungi. Fire and herbivory explained on average 7.5 and 9.8% of the fungal community variability, respectively, compared to 6.0 and 5.6% for bacteria. The relatively small changes in microbial communities due to natural disturbance is in stark contrast to dramatic vegetation and edaphic changes and suggests that soil microbial communities, having evolved with disturbance, are resistant to change. This represents both a buffer to short-term anthropogenic-induced change

Published
2021

27. Floristic evidence for alternative biome states in tropical Africa

Author

Aleman, Julie, Fayolle, Adeline, Favier, Charly, Staver, Ann Carla, Dexter, Kyle Graham, Ryan, Casey C.M., Azihou, Akomian Fortuné, Bauman, David, te Beest, Mariska, Chidumayo, Emmanuel Ngulube, Comiskey, James, Cromsigt, Joris J.P.G.M., Dessard, Hélène, Doucet, Jean-Louis, Finckh, Manfred, Gillet, Jean-Francois, Gourlet-Fleury, Sylvie, Hempson, Gareth G.P., Holdo, Ricardo, Kirunda, Ben, Kouame, Francois, Mahy, Grégory, Maiato, F., Gonçalves, P., McNicol, Iain, Nieto-Quintano, Paula, Plumptre, Andrew A.J., Pritchard, Rose, Revermann, Rasmus, Schmitt, Christine C.B., Swemmer, Anthony, Talila, Habte, Woollen, Emily, and Swaine, Mike

Subjects
Biologie du sol (relations sol plantes), Ecologie, Alternative stable states, Biologie spatiale, Ecologie [végétale]
Abstract

The idea that tropical forest and savanna are alternative states is crucial to how we manage these biomes and predict their future under global change. Large-scale empirical evidence for alternative stable states is limited, however, and comes mostly from the multimodal distribution of structural aspects of vegetation. These approaches have been criticized, as structure alone cannot separate out wetter savannas from drier forests for example, and there are also technical challenges to mapping vegetation structure in unbiased ways. Here, we develop an alternative approach to delimit the climatic envelope of the two biomes in Africa using tree species lists gathered for a large number of forest and savanna sites distributed across the continent. Our analyses confirm extensive climatic overlap of forest and savanna, supporting the alternative stable states hypothesis for Africa, and this result is corroborated by paleoecological evidence. Further, we find the two biomes to have highly divergent tree species compositions and to represent alternative compositional states. This allowed us to classify tree species as forest vs. savanna specialists, with some generalist species that span both biomes. In conjunction with georeferenced herbarium records, we mapped the forest and savanna distributions across Africa and quantified their environmental limits, which are primarily related to precipitation and seasonality, with a secondary contribution of fire. These results are important for the ongoing efforts to restore African ecosystems, which depend on accurate biome maps to set appropriate targets for the restored states but also provide empirical evidence for broad-scale bistability., SCOPUS: ar.j, info:eu-repo/semantics/published

Published
2020

28. Spatial geochemistry influences the home range of elephants

Author

Sach, Fiona, Yon, Lisa, Henley, Michelle D., Bedetti, Anka, Buss, Peter, de Boer, Willem Frederik, Dierenfeld, Ellen S., Gardner, Amanda, Langley-Evans, Simon C., Hamilton, Elliott, Lark, R. Murray, Prins, Herbert H.T., Swemmer, Anthony M., Watts, Michael, Sach, Fiona, Yon, Lisa, Henley, Michelle D., Bedetti, Anka, Buss, Peter, de Boer, Willem Frederik, Dierenfeld, Ellen S., Gardner, Amanda, Langley-Evans, Simon C., Hamilton, Elliott, Lark, R. Murray, Prins, Herbert H.T., Swemmer, Anthony M., and Watts, Michael

Abstract

The unique geochemistry surrounding the Palabora Mining Company (PMC) land may act as a micronutrient hotspot, attracting elephants to the area. The PMC produces refined copper and extracts phosphates and other minerals. Understanding the spatial influence of geochemistry on the home range size of African elephants is important for elephant population management and conservation. The home ranges of collared elephants surrounding the PMC were significantly smaller (P = 0.001) than conspecifics in surrounding reserves, suggesting that their resource needs were met within these smaller areas. Environmental samples (soil, water and plants) were analysed from the mine area and along six transects radiating from the mine centre. Tail hair and faecal samples from elephants at the PMC, and conspecifics within the surrounding area were analysed. All samples were analysed for minerals essential to health and potentially toxic elements (PTEs; As, Ca, Cd, Cu, Fe, K, Mg, Mn, Na, P, Pb, Se, U, V and Zn). Results show that the geochemistry at the PMC is different compared to surrounding areas, with significant elevations seen in all analysed minerals and PTEs in soil closer to the mine, thereby drawing the elephants to the area. Additionally significant elevations were seen in elements analysed in water and vegetation samples. Elephant tail hair from elephants at the mine was significantly greater in Cd, whilst Mg, P, Cu, As, Cd, Pb and U concentrations were significantly greater in elephant faecal samples at the mine compared to the non-mine samples. When micronutrient hotspots overlap with human activity (such as mining), this can lead to poor human-elephant coexistence and thus conflict. When managing elephant populations, the influence of mineral provision on elephant movement must be considered. Such detailed resource information can inform conservation efforts for coordinated programmes (UN SDGs 15 and 17) and underpin sustainable economic activity (UN SDG 8, 11 and 12).

Published
2020

30. Spatial geochemistry influences the home range of elephants

Author

Sach, Fiona, primary, Yon, Lisa, additional, Henley, Michelle D., additional, Bedetti, Anka, additional, Buss, Peter, additional, de Boer, Willem Frederik, additional, Dierenfeld, Ellen S., additional, Gardner, Amanda, additional, Langley-Evans, Simon C., additional, Hamilton, Elliott, additional, Lark, R. Murray, additional, Prins, Herbert H.T., additional, Swemmer, Anthony M., additional, and Watts, Michael J., additional

Published
2020
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31. A sharp floristic discontinuity revealed by the biogeographic regionalization of African savannas

Author

Fayolle, Adeline, Swaine, Michael D., Aleman, Julie, Azihou, Akomian F., Bauman, David, te Beest, Mariska, Chidumayo, Emmanuel N., Cromsigt, Joris P. G. M., Dessard, Hélène, Finckh, Manfred, Gonçalves, Francisco Maiato P., Gillet, Jean-Francois, Gorel, Anais, Hick, Aurélie, Holdo, Ricardo, Kirunda, Ben, Mahy, Gregory, McNicol, Iain, Ryan, Casey M., Revermann, Rasmus, Plumptre, Andrew, Pritchard, Rose, Nieto-Quintano, Paula, Schmitt, Christine B., Seghieri, Josiane, Swemmer, Anthony, Talila, Habte, Woollen, Emily, Fayolle, Adeline, Swaine, Michael D., Aleman, Julie, Azihou, Akomian F., Bauman, David, te Beest, Mariska, Chidumayo, Emmanuel N., Cromsigt, Joris P. G. M., Dessard, Hélène, Finckh, Manfred, Gonçalves, Francisco Maiato P., Gillet, Jean-Francois, Gorel, Anais, Hick, Aurélie, Holdo, Ricardo, Kirunda, Ben, Mahy, Gregory, McNicol, Iain, Ryan, Casey M., Revermann, Rasmus, Plumptre, Andrew, Pritchard, Rose, Nieto-Quintano, Paula, Schmitt, Christine B., Seghieri, Josiane, Swemmer, Anthony, Talila, Habte, and Woollen, Emily

Abstract

Aim In tropical Africa, savannas cover huge areas, have high plant species richness and are considered as a major natural resource for most countries. There is, however, little information available on their floristics and biogeography at the continental scale, despite the importance of such information for our understanding of the drivers of species diversity at various scales and for effective conservation and management. Here, we collated and analysed floristic data from across the continent in order to propose a biogeographical regionalization for African savannas. Location We collated floristic information (specifically woody species lists) for 298 samples of savanna vegetation across Africa, extending from 18° N to 33° S and from 17° W to 48° E. Taxa We focused on native woody species. Methods We used ordination and clustering to identify the floristic discontinuities and gradual transitions across African savannas. Floristic relationships, specificity and turnover, within and between floristic clusters, were analysed using a (dis-)similarity-based approach. Results We identified eight floristic clusters across African savannas which in turn were grouped into two larger macro-units. Ordinations at species and genus levels showed a clear differentiation in woody species composition between the North/West macro-unit and the South/East macro-unit. This floristic discontinuity matches to the High (i.e. N&W) and Low (S&E) division of Africa previously proposed by White () and which tracks climatic and topographical variation. In the N&W savannas, the floristic gradient determined by rainfall was partitioned into the Sudanian (drier) and Guinean (wetter) clusters. Within the highly heterogeneous S&E savannas and woodlands, six clusters were identified: Ugandan, Ethiopian, Mozambican, Zambezian, Namibian and South African. Main conclusions The proposed pan-African classification of savannas and woodlands might assist the development of coordi

Published
2019

32. A sharp floristic discontinuity revealed by the biogeographic regionalization of African savannas

Author

Spatial Ecology and Global Change, Environmental Sciences, Fayolle, Adeline, Swaine, Michael D., Aleman, Julie, Azihou, Akomian F., Bauman, David, te Beest, Mariska, Chidumayo, Emmanuel N., Cromsigt, Joris P. G. M., Dessard, Hélène, Finckh, Manfred, Gonçalves, Francisco Maiato P., Gillet, Jean-Francois, Gorel, Anais, Hick, Aurélie, Holdo, Ricardo, Kirunda, Ben, Mahy, Gregory, McNicol, Iain, Ryan, Casey M., Revermann, Rasmus, Plumptre, Andrew, Pritchard, Rose, Nieto-Quintano, Paula, Schmitt, Christine B., Seghieri, Josiane, Swemmer, Anthony, Talila, Habte, Woollen, Emily, Spatial Ecology and Global Change, Environmental Sciences, Fayolle, Adeline, Swaine, Michael D., Aleman, Julie, Azihou, Akomian F., Bauman, David, te Beest, Mariska, Chidumayo, Emmanuel N., Cromsigt, Joris P. G. M., Dessard, Hélène, Finckh, Manfred, Gonçalves, Francisco Maiato P., Gillet, Jean-Francois, Gorel, Anais, Hick, Aurélie, Holdo, Ricardo, Kirunda, Ben, Mahy, Gregory, McNicol, Iain, Ryan, Casey M., Revermann, Rasmus, Plumptre, Andrew, Pritchard, Rose, Nieto-Quintano, Paula, Schmitt, Christine B., Seghieri, Josiane, Swemmer, Anthony, Talila, Habte, and Woollen, Emily

Published
2019

36. A sharp floristic discontinuity revealed by the biogeographic regionalization of African savannas

Author

Fayolle, Adeline, primary, Swaine, Michael D., additional, Aleman, Julie, additional, Azihou, Akomian F., additional, Bauman, David, additional, te Beest, Mariska, additional, Chidumayo, Emmanuel N., additional, Cromsigt, Joris P. G. M., additional, Dessard, Hélène, additional, Finckh, Manfred, additional, Gonçalves, Francisco Maiato P., additional, Gillet, Jean-Francois, additional, Gorel, Anais, additional, Hick, Aurélie, additional, Holdo, Ricardo, additional, Kirunda, Ben, additional, Mahy, Gregory, additional, McNicol, Iain, additional, Ryan, Casey M., additional, Revermann, Rasmus, additional, Plumptre, Andrew, additional, Pritchard, Rose, additional, Nieto-Quintano, Paula, additional, Schmitt, Christine B., additional, Seghieri, Josiane, additional, Swemmer, Anthony, additional, Talila, Habte, additional, and Woollen, Emily, additional

Published
2018
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40. An investigation of the limited distribution of the grazing lawns in Hluhluwe-Umfolozi Park, South Africa

Author

Swemmer, Anthony Michael, Bond, William J, and Stock, WD

Subjects
Botany
Abstract

Bibliography: leaves 220-238., The grasslands and savannas of the Hluhluwe-Umfolozi Park (HUP), South Africa contain unusual 'grazing lawn' communities dominated by short, grazing tolerant grasses. These grazing lawns appear to be highly productive, and support high densities of grazers during the late summer and early winter, but have a very limited distribution within HUP. A review of the grazing literature indicates a similar pattern at the global scale, with grazing lawns absent or rare in almost every grass-grazer system described. Resource limitations responsible for the limited distribution of grazing lawns were investigated. A conceptual model of key processes considered necessary for the formation and persistence of lawns in HUP was developed. Key processes include both frequent and non-selective grazing during the growing season Based on observations that the distribution of grazing lawns within HUP is strongly related to rainfall, it was hypothesized that further key processes control are involved. In areas of lowest rainfall grazing lawns are replaced by a sparse cover of forbs and unpalatable grass species. It was hypothesized that a shortage of mineral nitrogen (N) and / or water are key processes excluding grazing lawn grasses in these environments. In areas of highest rainfall grazing lawns do not form, even where grass communities have been heavily grazed for a year or more. It was hypothesized that below-ground competition for N by the dominant grasses (bunch grasses) prevent the establishment of grazing lawn grasses in these environments.

Published
2002

43. Savanna Tree Seedlings are Physiologically Tolerant to Nighttime Freeze Events.

Author

O'Keefe, Kimberly, Nippert, Jesse B., and Swemmer, Anthony M.

Subjects
TREE seedlings, EFFECT of freezes on plants, HYDRAULIC conductivity
Abstract

Freeze events can be important disturbances in savanna ecosystems, yet the interactive effect of freezing with other environmental drivers on plant functioning is unknown. Here, we investigated physiological responses of South African tree seedlings to interactions of water availability and freezing temperatures. We grew widely distributed South African tree species (Colophospermum mopane, Combretum apiculatum, Acacia nigrescens, and Cassia abbreviata) under well-watered and water-limited conditions and exposed individuals to nighttime freeze events. Of the four species studied here, C. mopane was the most tolerant of lower water availability. However, all species were similarly tolerant to nighttime freezing and recovered within one week following the last freezing event. We also show that water limitation somewhat increased freezing tolerance in one of the species (C. mopane). Therefore, water limitation, but not freezing temperatures, may restrict the distribution of these species, although the interactions of these stressors may have species-specific impacts on plant physiology. Ultimately, we show that unique physiologies can exist among dominant species within communities and that combined stresses may play a currently unidentified role in driving the function of certain species within southern Africa. [ABSTRACT FROM AUTHOR]

Published
2016
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44. Evidence for facultative deciduousness in C olophospermum mopane in semi-arid African savannas.

Author

Stevens, Nicola, Archibald, Sally A., Nickless, Alecia, Swemmer, Anthony, and Scholes, Robert J.

Subjects
PLANT phenology, LEAF age, MOPANE tree, ECOSYSTEMS, CLIMATE change
Abstract

Leaf phenology dictates the time available for carbon assimilation, transpiration and nutrient uptake in plants. Understanding the environmental cues that control phenology is therefore vital for predicting climate-related changes to plant and ecosystem function. In contrast to temperate systems, and to a lesser degree, tropical forest systems, the cues initiating leaf drop in tropical savannas are poorly studied. We investigated the cues for leaf fall in a tropical monodominant arid savanna species, C olophospermum mopane, using an irrigation experiment. We tracked soil moisture, solar radiation, air temperature, leaf water status, leaf health and leaf carbon balance through the dry season in both irrigated and control plants. Water was the primary cue driving leaf loss of C . mopane rather than temperature or light. Trees watered throughout the dry season retained their canopies. These leaves remained functional and continued photosynthesis throughout the dry season. Leaf carbon acquisition rates did not decline with leaf age but were affected by soil moisture availability and temperature. Leaf loss did not occur when leaf carbon gain was zero, or when a particular leaf carbon threshold was reached. C olophospermum mopane is facultatively deciduous as water availability determines leaf drop in this widespread arid savanna species. Obligate deciduosity is not the only successful strategy in climates with a long dry season. [ABSTRACT FROM AUTHOR]

Published
2016
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48. Roles of environmental variables and land usage as drivers of dung beetle assemblage structure in mopane woodland.

Author

Davis, Adrian L. V., Swemmer, Anthony M., Scholtz, Clarke H., Deschodt, Christian M., and Tshikae, B. Power

Subjects
*DUNG beetles, *INSECT diversity, *MOPANE tree, *LAND use, *FORESTS & forestry
Abstract

Colophospermum mopane woodland covers large areas of dry lowland savanna in southeastern Africa. Dominant land usage is conservation (45%) with the remainder mostly modified by farming. Dung beetle responses to environment (dung type, habitat, weather) and land usage (conservation, farming, mining) were examined at Phalaborwa (23.9431° S 31.1411° E) in the Phalaborwa- Timbavati Mopaneveld, South Africa. Partitioning of gamma species richness and diversity showed lower alpha values in mine areas than in farm and conserved areas. However, between-land usage differences in species richness, alpha diversity, abundance and biomass, showed lower significance than those between dung type and different weather. At two sampling scales, three multivariate techniques variously separated assemblages according to land usage, dung type and weather. Analysis of 21 mean samples separated clusters according to dung type ( Canonical Correspondence Analysis, CCA) or mine assemblages, conserved plus farm assemblages on pig plus elephant, or cattle dung ( NMDS, Factor Analysis) with shared variance of >80% and unique variance of 16-18% per cluster. In analysis of 188 samples ( CCA), each overlapping dung type cluster was offset in ordinal space with congruent patterns of separation according to land usage and weather (drier days distant from moister days; conserved plus farm areas distant from early succession mine areas, which were distant from disturbed and later succession mine areas). Mining, dung types, and moist conditions were the strongest contributors to between-assemblage differences. Compared with conserved areas, dung beetle diversity is appreciably altered by mining but only slightly altered by intensive game farming or livestock ranching with subsistence agriculture. [ABSTRACT FROM AUTHOR]

Published
2014
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49. GROWTH RESPONSES OF TWO DOMINANT C4 GRASS SPECIES TO ALTERED WATER AVAILABILITY.

Author

Swemmer, Anthony M., Knapp, Alan K., and Smith, Melinda D.

Subjects
PLANT species, DROUGHTS, PLANT communities, BIOTIC communities, CLIMATE change, GRASSLANDS, ANDROPOGON, SOIL moisture
Abstract

Identifying key ecophysiological traits that differ among dominant plant species and can be linked to species-specific responses to drought would improve our ability to forecast community and ecosystem responses to global climate change. The mesic grasslands of the central plains of North America are dominated by two C4 grass species, Andropogon gerardii and Sorghastrum nutans, which purportedly differ in their tolerance of water stress. Individuals of these two species were grown in the field under rain-out shelters and subjected to wet (watered every 2–3 d) or dry (repeatedly subjected to wilting before watering) soil moisture regimes. A range of ecophysiological traits potentially important for tolerating water stress were concurrently measured. Although few traits differed between the species in the wet treatment, several traits were identified in the dry treatment that may enable A. gerardii to better tolerate drought. These were greater allocation to roots, reduced allocation to flowering, more rapid leaf turnover, and more rapid recovery of photosynthesis after wilting. The latter two traits may be particularly important for coping with increased variability in rainfall regimes in the future and are consistent with recently documented responses of A. gerardii to experimental increases in soil moisture variability. [ABSTRACT FROM AUTHOR]

Published
2006
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50. Grazing and ecosystem service delivery in global drylands.

Author

Maestre FT, Le Bagousse-Pinguet Y, Delgado-Baquerizo M, Eldridge DJ, Saiz H, Berdugo M, Gozalo B, Ochoa V, Guirado E, García-Gómez M, Valencia E, Gaitán JJ, Asensio S, Mendoza BJ, Plaza C, Díaz-Martínez P, Rey A, Hu HW, He JZ, Wang JT, Lehmann A, Rillig MC, Cesarz S, Eisenhauer N, Martínez-Valderrama J, Moreno-Jiménez E, Sala O, Abedi M, Ahmadian N, Alados CL, Aramayo V, Amghar F, Arredondo T, Ahumada RJ, Bahalkeh K, Ben Salem F, Blaum N, Boldgiv B, Bowker MA, Bran D, Bu C, Canessa R, Castillo-Monroy AP, Castro H, Castro I, Castro-Quezada P, Chibani R, Conceição AA, Currier CM, Darrouzet-Nardi A, Deák B, Donoso DA, Dougill AJ, Durán J, Erdenetsetseg B, Espinosa CI, Fajardo A, Farzam M, Ferrante D, Frank ASK, Fraser LH, Gherardi LA, Greenville AC, Guerra CA, Gusmán-Montalvan E, Hernández-Hernández RM, Hölzel N, Huber-Sannwald E, Hughes FM, Jadán-Maza O, Jeltsch F, Jentsch A, Kaseke KF, Köbel M, Koopman JE, Leder CV, Linstädter A, le Roux PC, Li X, Liancourt P, Liu J, Louw MA, Maggs-Kölling G, Makhalanyane TP, Issa OM, Manzaneda AJ, Marais E, Mora JP, Moreno G, Munson SM, Nunes A, Oliva G, Oñatibia GR, Peter G, Pivari MOD, Pueyo Y, Quiroga RE, Rahmanian S, Reed SC, Rey PJ, Richard B, Rodríguez A, Rolo V, Rubalcaba JG, Ruppert JC, Salah A, Schuchardt MA, Spann S, Stavi I, Stephens CRA, Swemmer AM, Teixido AL, Thomas AD, Throop HL, Tielbörger K, Travers S, Val J, Valkó O, van den Brink L, Ayuso SV, Velbert F, Wamiti W, Wang D, Wang L, Wardle GM, Yahdjian L, Zaady E, Zhang Y, Zhou X, Singh BK, and Gross N

Subjects
Climate Change, Soil, Biodiversity, Herbivory, Livestock
Abstract

Grazing represents the most extensive use of land worldwide. Yet its impacts on ecosystem services remain uncertain because pervasive interactions between grazing pressure, climate, soil properties, and biodiversity may occur but have never been addressed simultaneously. Using a standardized survey at 98 sites across six continents, we show that interactions between grazing pressure, climate, soil, and biodiversity are critical to explain the delivery of fundamental ecosystem services across drylands worldwide. Increasing grazing pressure reduced ecosystem service delivery in warmer and species-poor drylands, whereas positive effects of grazing were observed in colder and species-rich areas. Considering interactions between grazing and local abiotic and biotic factors is key for understanding the fate of dryland ecosystems under climate change and increasing human pressure.

Published
2022
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