14 results on '"Phelps, Leanne N."'
Search Results
2. Pollen-based climate reconstruction techniques for late Quaternary studies
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Chevalier, Manuel, Davis, Basil A.S., Heiri, Oliver, Seppä, Heikki, Chase, Brian M., Gajewski, Konrad, Lacourse, Terri, Telford, Richard J., Finsinger, Walter, Guiot, Joël, Kühl, Norbert, Maezumi, S. Yoshi, Tipton, John R., Carter, Vachel A., Brussel, Thomas, Phelps, Leanne N., Dawson, Andria, Zanon, Marco, Vallé, Francesca, Nolan, Connor, Mauri, Achille, de Vernal, Anne, Izumi, Kenji, Holmström, Lasse, Marsicek, Jeremiah, Goring, Simon, Sommer, Philipp S., Chaput, Michelle, and Kupriyanov, Dmitry
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- 2020
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3. A 1300-year multi-proxy palaeoecological record from the northwest Putorana Plateau (Russian Subarctic): environmental changes, vegetation dynamics and fire history.
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Novenko, Elena Yu, Mazei, Natalia G, Kupriyanov, Dmitry A, Babeshko, Kirill V, Kusilman, Maria V, Zyuganova, Inna S, Tsyganov, Andrey N, Mazei, Yuri A, Phelps, Leanne N, and Davis, Basil AS
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VEGETATION dynamics ,LITTLE Ice Age ,PALEOECOLOGY ,FIRE management ,WATER table ,ENVIRONMENTAL sciences - Abstract
This paper presents a reconstruction of natural environmental dynamics, wildfires and vegetation change in northwest Putorana Plateau during the last 1300 years. The study area is a remote and poorly investigated region of subarctic Siberia, relatively untouched by human impacts, which offers a unique opportunity to examine natural environmental dynamics and climate-vegetation-fire relationships. The paleoenvironmental reconstructions are based on multi-proxy analysis of the Gervi peatland including pollen, plant macrofossil, testate amoebae and charcoal analysis, loss on ignition measurements and AMS radiocarbon dating. The results revealed the main phases of regional paleoenvironmental change: a warm period between 680 and 1200 C.E. (Common Era) corresponding to the Mediaeval Climate Anomaly (MCA), followed by climate cooling during the Little Ice Age (LIA, 1200–1850 C.E.) and subsequent centuries. Climate amelioration during the MCA led to afforestation of northwestern Putorana Plateau and an expansion of spruce extending 70 km northeast of its present geographical range. A quantitative water-table reconstruction was generated using a testate amoebae transfer function and suggested that relatively dry climate conditions during the MCA triggered high fire frequencies. The LIA appeared in the study area as a period of pronounced climate cooling and moderate moistening, which caused an extension of tundra vegetation and a dramatic decline of fire activity. Distinct environmental changes at the study site were detected since 1990 C.E., characterized by a high peat accumulation rate and rising water table. Since 1990 C.E., the macroscopic charcoal accumulation rate in the peat core increased abruptly, suggesting a recent increase in the fire frequency in the study region. [ABSTRACT FROM AUTHOR]
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- 2023
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4. Madagascar's fire regimes challenge global assumptions about landscape degradation.
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Phelps, Leanne N., Andela, Niels, Gravey, Mathieu, Davis, Dylan S., Kull, Christian A., Douglass, Kristina, and Lehmann, Caroline E. R.
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FIRE ecology , *FIRE management , *COMPARATIVE method , *TROPICAL forests , *COMMUNITIES , *REMOTE sensing , *LANDSCAPES - Abstract
Narratives of landscape degradation are often linked to unsustainable fire use by local communities. Madagascar is a case in point: the island is considered globally exceptional, with its remarkable endemic biodiversity viewed as threatened by unsustainable anthropogenic fire. Yet, fire regimes on Madagascar have not been empirically characterised or globally contextualised. Here, we contribute a comparative approach to determining relationships between regional fire regimes and global patterns and trends, applied to Madagascar using MODIS remote sensing data (2003–2019). Rather than a global exception, we show that Madagascar's fire regimes are similar to 88% of tropical burned area with shared climate and vegetation characteristics, and can be considered a microcosm of most tropical fire regimes. From 2003–2019, landscape‐scale fire declined across tropical grassy biomes (17%–44% excluding Madagascar), and on Madagascar at a relatively fast rate (36%–46%). Thus, high tree loss anomalies on the island (1.25–4.77× the tropical average) were not explained by any general expansion of landscape‐scale fire in grassy biomes. Rather, tree loss anomalies centred in forests, and could not be explained by landscape‐scale fire escaping from savannas into forests. Unexpectedly, the highest tree loss anomalies on Madagascar (4.77×) occurred in environments without landscape‐scale fire, where the role of small‐scale fires (<21 h [0.21 km2]) is unknown. While landscape‐scale fire declined across tropical grassy biomes, trends in tropical forests reflected important differences among regions, indicating a need to better understand regional variation in the anthropogenic drivers of forest loss and fire risk. Our new understanding of Madagascar's fire regimes offers two lessons with global implications: first, landscape‐scale fire is declining across tropical grassy biomes and does not explain high tree loss anomalies on Madagascar. Second, landscape‐scale fire is not uniformly associated with tropical forest loss, indicating a need for socio‐ecological context in framing new narratives of fire and ecosystem degradation. [ABSTRACT FROM AUTHOR]
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- 2022
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5. Late-Holocene vegetation and fire history in Western Putorana Plateau (subarctic Siberia, Russia).
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Novenko, Elena Yu, Rudenko, Olga V, Mazei, Natalia G, Kupriyanov, Dmitry A, Batalova, Vlada A, Volkova, Elena M, Phelps, Leanne N, and Davis, Basil AS
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TUNDRAS ,VEGETATION dynamics ,WATERSHEDS ,CLIMATE change ,CHARCOAL ,FORESTS & forestry - Abstract
We present a reconstruction of vegetation dynamics and fire history from the western part of the Putorana Plateau during the Late-Holocene. The study area is located in the remote and poorly investigated region of Central Siberia, which represents an important area for understanding climate and environmental changes in the Russian Subarctic. Pollen and macroscopic charcoal data from three closely located lakes along an altitudinal transect in the Khantaika River basin show no major changes in vegetation in the study area during the last 3.9 ka BP. However, a detailed analysis of the data reveals an extension of forest coverage in lake catchments at about 3.1 ka BP followed by a gradual degradation of woodlands, and an expansion of shrubs and tundra vegetation at around 2.7–2.5 ka BP. Fire activity was relatively high between 3.0 and 2.0 ka BP compared to all but the most modern part of the record, while macroscopic charcoal accumulation reaches a maximum in the most recent surface sediments. This suggests an increase in the frequency and area of fires in the region since the end of the 19th century, which has no analog during the Late-Holocene. [ABSTRACT FROM AUTHOR]
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- 2022
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6. Presenting the AfriArch Isotopic Database.
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GOLDSTEIN, STEVEN, HIXON, SEAN, SCOTT, ERIN, WOLFHAGEN, JESSE, IMINJILI, VICTOR, JANZEN, ANNEKE, CHRITZ, KENDRA, SAWCHUK, ELIZABETH, NDIEMA, EMMANUEL, SEALY, JUDITH C., STONE, ABIGAIL, ZOELLER, GRETCHEN, PHELPS, LEANNE N., and FERNANDES, RICARDO
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- 2022
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7. The aerial panopticon and the ethics of archaeological remote sensing in sacred cultural spaces.
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Davis, Dylan S., Buffa, Danielle, Rasolondrainy, Tanambelo, Creswell, Ebony, Anyanwu, Chiamaka, Ibirogba, Abiola, Randolph, Clare, Ouarghidi, Abderrahim, Phelps, Leanne N., Lahiniriko, François, Chrisostome, Zafy Maharesy, Manahira, George, and Douglass, Kristina
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REMOTE sensing ,ARCHAEOLOGY ,SACRED space ,POWER (Social sciences) ,ACQUISITION of data ,ETHICS - Abstract
Remote sensing technology has become a standard tool for archaeological prospecting. Yet the ethical guidelines associated with the use of these technologies are not well established and are even less‐often discussed in published literature. With a nearly unobstructed view of large geographic spaces, aerial and spaceborne remote sensing technology creates an asymmetrical power dynamic between observers and the observed. Here, we explore the power dynamics involved with aerial and spaceborne remote sensing, using Foucault's notion of power and the panopticon. In many other areas of archaeological practice, such power imbalances have been actively confronted by collaborative approaches and community engagement, but remote sensing archaeology has been largely absent from such interventions. We discuss how aerial and spaceborne imagery is perceived by local communities in southwest Madagascar and advocate for a more collaborative approach to remote sensing archaeology that includes local stakeholders and researchers in all levels of data acquisition, analysis, and dissemination. [ABSTRACT FROM AUTHOR]
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- 2021
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8. The Eurasian Modern Pollen Database (EMPD), version 2.
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Davis, Basil A. S., Chevalier, Manuel, Sommer, Philipp, Carter, Vachel A., Finsinger, Walter, Mauri, Achille, Phelps, Leanne N., Zanon, Marco, Abegglen, Roman, Åkesson, Christine M., Alba-Sánchez, Francisca, Anderson, R. Scott, Antipina, Tatiana G., Atanassova, Juliana R., Beer, Ruth, Belyanina, Nina I., Blyakharchuk, Tatiana A., Borisova, Olga K., Bozilova, Elissaveta, and Bukreeva, Galina
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FOSSIL pollen ,POLLEN ,DATABASES ,GEODATABASES ,LAND use - Abstract
The Eurasian (née European) Modern Pollen Database (EMPD) was established in 2013 to provide a public database of high-quality modern pollen surface samples to help support studies of past climate, land cover, and land use using fossil pollen. The EMPD is part of, and complementary to, the European Pollen Database (EPD) which contains data on fossil pollen found in Late Quaternary sedimentary archives throughout the Eurasian region. The EPD is in turn part of the rapidly growing Neotoma database, which is now the primary home for global palaeoecological data. This paper describes version 2 of the EMPD in which the number of samples held in the database has been increased by 60 % from 4826 to 8134. Much of the improvement in data coverage has come from northern Asia, and the database has consequently been renamed the Eurasian Modern Pollen Database to reflect this geographical enlargement. The EMPD can be viewed online using a dedicated map-based viewer at https://empd2.github.io and downloaded in a variety of file formats at https://doi.pangaea.de/10.1594/PANGAEA.909130 (Chevalier et al., 2019). [ABSTRACT FROM AUTHOR]
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- 2020
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9. Asymmetric response of forest and grassy biomes to climate variability across the African Humid Period: influenced by anthropogenic disturbance?
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Phelps, Leanne N., Chevalier, Manuel, Shanahan, Timothy M., Aleman, Julie C., Courtney‐Mustaphi, Colin, Kiahtipes, Christopher Albert, Broennimann, Oliver, Marchant, Rob, Shekeine, John, Quick, Lynne J., Davis, Basil A. S., Guisan, Antoine, and Manning, Katie
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BIOMES , *EFFECT of human beings on climate change , *VEGETATION dynamics , *LAND cover , *CLIMATOLOGY , *LAND use , *HOLOCENE Epoch , *SHRUBLANDS - Abstract
A comprehensive understanding of the relationship between land cover, climate change and disturbance dynamics is needed to inform scenarios of vegetation change on the African continent. Although significant advances have been made, large uncertainties exist in projections of future biodiversity and ecosystem change for the world's largest tropical landmass. To better illustrate the effects of climate–disturbance–ecosystem interactions on continental‐scale vegetation change, we apply a novel statistical multivariate envelope approach to subfossil pollen data and climate model outputs (TraCE‐21ka). We target paleoenvironmental records across continental Africa, from the African Humid Period (AHP: ca 14 700–5500 yr BP) – an interval of spatially and temporally variable hydroclimatic conditions – until recent times, to improve our understanding of overarching vegetation trends and to compare changes between forest and grassy biomes (savanna and grassland). Our results suggest that although climate variability was the dominant driver of change, forest and grassy biomes responded asymmetrically: 1) the climatic envelope of grassy biomes expanded, or persisted in increasingly diverse climatic conditions, during the second half of the AHP whilst that of forest did not; 2) forest retreat occurred much more slowly during the mid to late Holocene compared to the early AHP forest expansion; and 3) as forest and grassy biomes diverged during the second half of the AHP, their ecological relationship (envelope overlap) fundamentally changed. Based on these asymmetries and associated changes in human land use, we propose and discuss three hypotheses about the influence of anthropogenic disturbance on continental‐scale vegetation change. [ABSTRACT FROM AUTHOR]
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- 2020
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10. Reconstructing the climatic niche breadth of land use for animal production during the African Holocene.
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Phelps, Leanne N., Broennimann, Olivier, Manning, Katie, Timpson, Adrian, Jousse, Hélène, Mariethoz, Gregoire, Fordham, Damien A., Shanahan, Timothy M., Davis, Basil A. S., Guisan, Antoine, and Fleishman, Erica
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LAND use , *CLIMATE change , *DOMESTIC animals , *ARCHAEOLOGICAL assemblages , *RADIOCARBON dating , *BEARING capacity of soils - Abstract
Aim: Domestic animals first appeared in the archaeological record in northern Africa c. 9000 years before present and subsequently spread southwards throughout the continent. This geographic expansion is well studied and can broadly be explained in terms of the movement of pastoralist populations due to climate change. However, no studies have explicitly evaluated changes in the climatic niche of these domesticates. A priori, one cannot assume a relationship between the geographic spread of animal production and changes in climatic niche breadth because their relationship is highly variable. Therefore, we investigated Holocene changes in the climatic niche of domestic animals (animal production) and compared these to changes in the climatic niche of hunted terrestrial ungulates. Location: The African continent. Time period: 9000–500 BP. Major taxa studied: Domestic animals, hunted (wild) terrestrial ungulates. Methods: For the first time, we applied methods from environmental niche dynamics to archaeological data to reconstruct and quantify changes in the climatic niche breadth of animal production during the African Holocene. We used faunal remains from archaeological assemblages and associated radiocarbon dates to estimate the proportion of the African climate space used for animal production and hunting at 500‐year intervals. Results: We found that the climatic niche of domestic species broadened significantly with the geographic spread, most notably during the termination of the African Humid Period, whilst no such broadening occurred for the climatic niche of hunted species. Main conclusions: Our results provide a quantitative measure of the extent to which humans have constructed and adapted the climatic niche of animal production to manage their domestic animals across increasingly diverse ecological conditions. By incorporating ecological analysis into estimations of past land use, our methods have the potential to improve reconstructions of land use change, and to provide a foundation on which further niche construction hypotheses may be tested. [ABSTRACT FROM AUTHOR]
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- 2020
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11. Land use for animal production in global change studies: Defining and characterizing a framework.
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Phelps, Leanne N. and Kaplan, Jed O.
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BROWSING (Animal behavior) , *GLOBAL environmental change , *GRAZING , *LAND cover , *LAND use , *LIVESTOCK , *PASTURE animals , *RANGELANDS - Abstract
Land use for animal production influences the earth system in a variety of ways, including local-scale modification to biodiversity, soils, and nutrient cycling; regional changes in albedo and hydrology; and global-scale changes in greenhouse gas and aerosol concentrations. Pasture is furthermore the single most extensive form of land cover, currently comprising about 22-26% of the earth's ice-free land surface. Despite the importance and variable expressions of animal production, distinctions among different systems are effectively absent from studies of land use and land cover change. This deficiency is improving; however, livestock production system classifications are rarely applied in this context, and the most popular global land cover inventories still present only a single, usually poorly defined category of 'pasture' or 'rangeland' with no characterization of land use. There is a marked lack of bottom-up, evidence-based methodology, creating a pressing need to incorporate cross-disciplinary evidence of past and present animal production systems into global change studies. Here, we present a framework, modified from existing livestock production systems, that is rooted in sociocultural, socioeconomic, and ecological contexts. The framework defines and characterizes the range of land usage pertaining to animal production, and is suitable for application in land use inventories and scenarios, land cover modeling, and studies on sustainable land use in the past, present, and future. [ABSTRACT FROM AUTHOR]
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- 2017
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12. Madagascar's extraordinary biodiversity: Threats and opportunities.
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Ralimanana H, Perrigo AL, Smith RJ, Borrell JS, Faurby S, Rajaonah MT, Randriamboavonjy T, Vorontsova MS, Cooke RSC, Phelps LN, Sayol F, Andela N, Andermann T, Andriamanohera AM, Andriambololonera S, Bachman SP, Bacon CD, Baker WJ, Belluardo F, Birkinshaw C, Cable S, Canales NA, Carrillo JD, Clegg R, Clubbe C, Crottini A, Damasco G, Dhanda S, Edler D, Farooq H, de Lima Ferreira P, Fisher BL, Forest F, Gardiner LM, Goodman SM, Grace OM, Guedes TB, Hackel J, Henniges MC, Hill R, Lehmann CER, Lowry PP 2nd, Marline L, Matos-Maraví P, Moat J, Neves B, Nogueira MGC, Onstein RE, Papadopulos AST, Perez-Escobar OA, Phillipson PB, Pironon S, Przelomska NAS, Rabarimanarivo M, Rabehevitra D, Raharimampionona J, Rajaonary F, Rajaovelona LR, Rakotoarinivo M, Rakotoarisoa AA, Rakotoarisoa SE, Rakotomalala HN, Rakotonasolo F, Ralaiveloarisoa BA, Ramirez-Herranz M, Randriamamonjy JEN, Randrianasolo V, Rasolohery A, Ratsifandrihamanana AN, Ravololomanana N, Razafiniary V, Razanajatovo H, Razanatsoa E, Rivers M, Silvestro D, Testo W, Torres Jiménez MF, Walker K, Walker BE, Wilkin P, Williams J, Ziegler T, Zizka A, and Antonelli A
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- Animals, Humans, Bayes Theorem, Biota, Madagascar, Mammals, Plants, Biodiversity, Endangered Species
- Abstract
Madagascar's unique biota is heavily affected by human activity and is under intense threat. Here, we review the current state of knowledge on the conservation status of Madagascar's terrestrial and freshwater biodiversity by presenting data and analyses on documented and predicted species-level conservation statuses, the most prevalent and relevant threats, ex situ collections and programs, and the coverage and comprehensiveness of protected areas. The existing terrestrial protected area network in Madagascar covers 10.4% of its land area and includes at least part of the range of the majority of described native species of vertebrates with known distributions (97.1% of freshwater fishes, amphibians, reptiles, birds, and mammals combined) and plants (67.7%). The overall figures are higher for threatened species (97.7% of threatened vertebrates and 79.6% of threatened plants occurring within at least one protected area). International Union for Conservation of Nature (IUCN) Red List assessments and Bayesian neural network analyses for plants identify overexploitation of biological resources and unsustainable agriculture as the most prominent threats to biodiversity. We highlight five opportunities for action at multiple levels to ensure that conservation and ecological restoration objectives, programs, and activities take account of complex underlying and interacting factors and produce tangible benefits for the biodiversity and people of Madagascar.
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- 2022
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13. Madagascar's extraordinary biodiversity: Evolution, distribution, and use.
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Antonelli A, Smith RJ, Perrigo AL, Crottini A, Hackel J, Testo W, Farooq H, Torres Jiménez MF, Andela N, Andermann T, Andriamanohera AM, Andriambololonera S, Bachman SP, Bacon CD, Baker WJ, Belluardo F, Birkinshaw C, Borrell JS, Cable S, Canales NA, Carrillo JD, Clegg R, Clubbe C, Cooke RSC, Damasco G, Dhanda S, Edler D, Faurby S, de Lima Ferreira P, Fisher BL, Forest F, Gardiner LM, Goodman SM, Grace OM, Guedes TB, Henniges MC, Hill R, Lehmann CER, Lowry PP 2nd, Marline L, Matos-Maraví P, Moat J, Neves B, Nogueira MGC, Onstein RE, Papadopulos AST, Perez-Escobar OA, Phelps LN, Phillipson PB, Pironon S, Przelomska NAS, Rabarimanarivo M, Rabehevitra D, Raharimampionona J, Rajaonah MT, Rajaonary F, Rajaovelona LR, Rakotoarinivo M, Rakotoarisoa AA, Rakotoarisoa SE, Rakotomalala HN, Rakotonasolo F, Ralaiveloarisoa BA, Ramirez-Herranz M, Randriamamonjy JEN, Randriamboavonjy T, Randrianasolo V, Rasolohery A, Ratsifandrihamanana AN, Ravololomanana N, Razafiniary V, Razanajatovo H, Razanatsoa E, Rivers M, Sayol F, Silvestro D, Vorontsova MS, Walker K, Walker BE, Wilkin P, Williams J, Ziegler T, Zizka A, and Ralimanana H
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- Humans, Biota, Forests, Madagascar, Phylogeny, Biodiversity, Biological Evolution
- Abstract
Madagascar's biota is hyperdiverse and includes exceptional levels of endemicity. We review the current state of knowledge on Madagascar's past and current terrestrial and freshwater biodiversity by compiling and presenting comprehensive data on species diversity, endemism, and rates of species description and human uses, in addition to presenting an updated and simplified map of vegetation types. We report a substantial increase of records and species new to science in recent years; however, the diversity and evolution of many groups remain practically unknown (e.g., fungi and most invertebrates). Digitization efforts are increasing the resolution of species richness patterns and we highlight the crucial role of field- and collections-based research for advancing biodiversity knowledge and identifying gaps in our understanding, particularly as species richness corresponds closely to collection effort. Phylogenetic diversity patterns mirror that of species richness and endemism in most of the analyzed groups. We highlight humid forests as centers of diversity and endemism because of their role as refugia and centers of recent and rapid radiations. However, the distinct endemism of other areas, such as the grassland-woodland mosaic of the Central Highlands and the spiny forest of the southwest, is also biologically important despite lower species richness. The documented uses of Malagasy biodiversity are manifold, with much potential for the uncovering of new useful traits for food, medicine, and climate mitigation. The data presented here showcase Madagascar as a unique "living laboratory" for our understanding of evolution and the complex interactions between people and nature. The gathering and analysis of biodiversity data must continue and accelerate if we are to fully understand and safeguard this unique subset of Earth's biodiversity.
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- 2022
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14. Mapping past human land use using archaeological data: A new classification for global land use synthesis and data harmonization.
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Morrison KD, Hammer E, Boles O, Madella M, Whitehouse N, Gaillard MJ, Bates J, Vander Linden M, Merlo S, Yao A, Popova L, Hill AC, Antolin F, Bauer A, Biagetti S, Bishop RR, Buckland P, Cruz P, Dreslerová D, Dusseldorp G, Ellis E, Filipovic D, Foster T, Hannaford MJ, Harrison SP, Hazarika M, Herold H, Hilpert J, Kaplan JO, Kay A, Klein Goldewijk K, Kolář J, Kyazike E, Laabs J, Lancelotti C, Lane P, Lawrence D, Lewis K, Lombardo U, Lucarini G, Arroyo-Kalin M, Marchant R, Mayle F, McClatchie M, McLeester M, Mooney S, Moskal-Del Hoyo M, Navarrete V, Ndiema E, Góes Neves E, Nowak M, Out WA, Petrie C, Phelps LN, Pinke Z, Rostain S, Russell T, Sluyter A, Styring AK, Tamanaha E, Thomas E, Veerasamy S, Welton L, and Zanon M
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- Arabia, Biodiversity, Climate, Conservation of Natural Resources, Data Management, Earth, Planet, Ecosystem, History, Ancient, Humans, Mesopotamia, Archaeology, Natural Resources
- Abstract
In the 12,000 years preceding the Industrial Revolution, human activities led to significant changes in land cover, plant and animal distributions, surface hydrology, and biochemical cycles. Earth system models suggest that this anthropogenic land cover change influenced regional and global climate. However, the representation of past land use in earth system models is currently oversimplified. As a result, there are large uncertainties in the current understanding of the past and current state of the earth system. In order to improve representation of the variety and scale of impacts that past land use had on the earth system, a global effort is underway to aggregate and synthesize archaeological and historical evidence of land use systems. Here we present a simple, hierarchical classification of land use systems designed to be used with archaeological and historical data at a global scale and a schema of codes that identify land use practices common to a range of systems, both implemented in a geospatial database. The classification scheme and database resulted from an extensive process of consultation with researchers worldwide. Our scheme is designed to deliver consistent, empirically robust data for the improvement of land use models, while simultaneously allowing for a comparative, detailed mapping of land use relevant to the needs of historical scholars. To illustrate the benefits of the classification scheme and methods for mapping historical land use, we apply it to Mesopotamia and Arabia at 6 kya (c. 4000 BCE). The scheme will be used to describe land use by the Past Global Changes (PAGES) LandCover6k working group, an international project comprised of archaeologists, historians, geographers, paleoecologists, and modelers. Beyond this, the scheme has a wide utility for creating a common language between research and policy communities, linking archaeologists with climate modelers, biodiversity conservation workers and initiatives., Competing Interests: The authors have declared that no competing interests exist.
- Published
- 2021
- Full Text
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