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1. Tundra Trait Team: A database of plant traits spanning the tundra biome

Author

Bjorkman, Anne D, Myers-Smith, Isla H, Elmendorf, Sarah C, Normand, Signe, Thomas, Haydn JD, Alatalo, Juha M, Alexander, Heather, Anadon-Rosell, Alba, Angers-Blondin, Sandra, Bai, Yang, Baruah, Gaurav, te Beest, Mariska, Berner, Logan, Bjork, Robert G, Blok, Daan, Bruelheide, Helge, Buchwal, Agata, Buras, Allan, Carbognani, Michele, Christie, Katherine, Collier, Laura S, Cooper, Elisabeth J, Cornelissen, J Hans C, Dickinson, Katharine JM, Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Forbes, Bruce C, Frei, Esther R, Iturrate-Garcia, Maitane, Good, Megan K, Grau, Oriol, Green, Peter, Greve, Michelle, Grogan, Paul, Haider, Sylvia, Hajek, Tomas, Hallinger, Martin, Happonen, Konsta, Harper, Karen A, Heijmans, Monique MPD, Henry, Gregory HR, Hermanutz, Luise, Hewitt, Rebecca E, Hollister, Robert D, Hudson, James, Huelber, Karl, Iversen, Colleen M, Jaroszynska, Francesca, Jimenez-Alfaro, Borja, Johnstone, Jill, Jorgensen, Rasmus Halfdan, Kaarlejarvi, Elina, Klady, Rebecca, Klimesova, Jitka, Korsten, Annika, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J, Lantz, Trevor, Lavalle, Amanda, Lembrechts, Jonas J, Levesque, Esther, Little, Chelsea J, Luoto, Miska, Macek, Petr, Mack, Michelle C, Mathakutha, Rabia, Michelsen, Anders, Milbau, Ann, Molau, Ulf, Morgan, John W, Morsdorf, Martin Alfons, Nabe-Nielsen, Jacob, Nielsen, Sigrid Scholer, Ninot, Josep M, Oberbauer, Steven F, Olofsson, Johan, Onipchenko, Vladimir G, Petraglia, Alessandro, Pickering, Catherine, Prevey, Janet S, Rixen, Christian, Rumpf, Sabine B, Schaepman-Strub, Gabriela, Semenchuk, Philipp, Shetti, Rohan, Soudzilovskaia, Nadejda A, Spasojevic, Marko J, Speed, James David Mervyn, Street, Lorna E, Suding, Katharine, Tape, Ken D, Tomaselli, Marcello, Trant, Andrew, Treier, Urs A, Tremblay, Jean-Pierre, Tremblay, Maxime, Venn, Susanna, and Virkkala, Anna-Maria

Subjects
alpine, Arctic, plant functional traits, tundra, Ecology, Ecological Applications, Physical Geography and Environmental Geoscience
Published
2018

2. Kilometre-scale simulations over Fennoscandia reveal a large loss of tundra due to climate warming

Author

Lagergren, Fredrik, Bjork, Robert G., Andersson, Camilla, Belušić, Danijel, Bjorkman, Mats P., Kjellström, Erik, Lind, Petter, Lindstedt, David, Olenius, Tinja, Pleijel, Hakan, Rosqvist, Gunhild, Miller, Paul A., Lagergren, Fredrik, Bjork, Robert G., Andersson, Camilla, Belušić, Danijel, Bjorkman, Mats P., Kjellström, Erik, Lind, Petter, Lindstedt, David, Olenius, Tinja, Pleijel, Hakan, Rosqvist, Gunhild, and Miller, Paul A.

Published
2024
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3. Growth rings show limited evidence for ungulates' potential to suppress shrubs across the Arctic

Author

Vuorinen, Katariina E. M., Austrheim, Gunnar, Tremblay, Jean-Pierre, Myers-Smith, Isla H., Hortman, Hans, Frank, Peter, Dalerum, Fredrik, Barrio, Isabel C., Bjorkman, Mats P., Bjork, Robert G., Ehrich, Dorothee, Sokolov, Aleksandr, Sokolova, Natalya, Ropars, Pascale, Boudreau, Stephane, Normand, Signe, Prendin, Angela L., Schmidt, Niels Martin, Pacheco-Solana, Arturo, Post, Eric, John, Christian, Kerby, Jeff, Sullivan, Patrick F., Hansen, Brage B., Le Moullec, Mathilde, van der Wal, René, Pedersen, Ashild O., Sandal, Lisa, Gough, Laura, Young, Amanda, Li, Bingxi, Magnusson, Runa, Sass-Klaassen, Ute, Welker, Jeffrey, Buchwal, Agata, Grogan, Paul, Andruko, Rhett, Morrissette-Boileau, Clara, Volkovitskiy, Alexander, Terekhina, Alexandra, and Speed, James D. M.

Subjects
Environmental Sciences (social aspects to be 507)
Abstract

Global warming has pronounced effects on tundra vegetation, and rising mean temperatures increase plant growth potential across the Arctic biome. Herbivores may counteract the warming impacts by reducing plant growth, but the strength of this effect may depend on prevailing regional climatic conditions. To study how ungulates interact with temperature to influence growth of tundra shrubs across the Arctic tundra biome, we assembled dendroecological data from 20 sites, comprising 1153 individual shrubs and 223 63 annual growth rings. Evidence for ungulates suppressing shrub radial growth was only observed at intermediate summer temperatures (6.5 degrees C-9 degrees C), and even at these temperatures the effect was not strong. Multiple factors, including forage preferences and landscape use by the ungulates, and favourable climatic conditions enabling effective compensatory growth of shrubs, may weaken the effects of ungulates on shrubs, possibly explaining the weakness of observed ungulate effects. Earlier local studies have shown that ungulates may counteract the impacts of warming on tundra shrub growth, but we demonstrate that ungulates' potential to suppress shrub radial growth is not always evident, and may be limited to certain climatic conditions.

Published
2022

4. SoilTemp : A global database of near-surface temperature

Author

Lembrechts, Jonas J., Aalto, Juha, Ashcroft, Michael B., De Frenne, Pieter, Kopecky, Martin, Lenoir, Jonathan, Luoto, Miska, Maclean, Ilya M. D., Roupsard, Olivier, Fuentes-Lillo, Eduardo, Garcia, Rafael A., Pellissier, Loic, Pitteloud, Camille, Alatalo, Juha M., Smith, Stuart W., Bjork, Robert G., Muffler, Lena, Backes, Amanda Ratier, Cesarz, Simone, Gottschall, Felix, Okello, Joseph, Urban, Josef, Plichta, Roman, Svatek, Martin, Phartyal, Shyam S., Wipf, Sonja, Eisenhauer, Nico, Puscas, Mihai, Turtureanu, Pavel D., Varlagin, Andrej, Dimarco, Romina D., Jump, Alistair S., Randall, Krystal, Dorrepaal, Ellen, Larson, Keith, Walz, Josefine, Vitale, Luca, Svoboda, Miroslav, Higgens, Rebecca Finger, Halbritter, H., Curasi, Salvatore R., Klupar, Ian, Koontz, Austin, Pearse, William D., Simpson, Elizabeth, Stemkovski, Michael, Graae, Bente Jessen, Sorensen, Mia Vedel, Hoye, Toke T., Fernandez Calzado, M. Rosa, Lorite, Juan, Carbognani, Michele, Tomaselli, Marcello, Forte, T'ai G. W., Petraglia, Alessandro, Haesen, Stef, Somers, Ben, Van Meerbeek, Koenraad, Bjorkman, Mats P., Hylander, Kristoffer, Merinero, Sonia, Gharun, Mana, Buchmann, Nina, Dolezal, Jiri, Matula, Radim, Thomas, Andrew D., Bailey, Joseph J., Ghosn, Dany, Kazakis, George, de Pablo, Miguel A., Kemppinen, Julia, Niittynen, Pekka, Rew, Lisa, Seipel, Tim, Larson, Christian, Speed, James D. M., Ardo, Jonas, Cannone, Nicoletta, Guglielmin, Mauro, Malfasi, Francesco, Bader, Maaike Y., Canessa, Rafaella, Stanisci, Angela, Kreyling, Juergen, Schmeddes, Jonas, Teuber, Laurenz, Aschero, Valeria, Ciliak, Marek, Malis, Frantisek, De Smedt, Pallieter, Govaert, Sanne, Meeussen, Camille, Vangansbeke, Pieter, Gigauri, Khatuna, Lamprecht, Andrea, Pauli, Harald, Steinbauer, Klaus, Winkler, Manuela, Ueyama, Masahito, Nunez, Martin A., Ursu, Tudor-Mihai, Haider, Sylvia, Wedegartner, Ronja E. M., Smiljanic, Marko, Trouillier, Mario, Wilmking, Martin, Altman, Jan, Bruna, Josef, Hederova, Lucia, Macek, Martin, Man, Matej, Wild, Jan, Vittoz, Pascal, Partel, Meelis, Barancok, Peter, Kanka, Robert, Kollar, Jozef, Palaj, Andrej, Barros, Agustina, Mazzolari, Ana C., Bauters, Marijn, Boeckx, Pascal, Benito Alonso, Jose-Luis, Zong, Shengwei, Di Cecco, Valter, Sitkova, Zuzana, Tielboerger, Katja, van den Brink, Liesbeth, Weigel, Robert, Homeier, Juergen, Dahlberg, C. Johan, Medinets, Sergiy, Medinets, Volodymyr, De Boeck, Hans J., Portillo-Estrada, Miguel, Verryckt, Lore T., Milbau, Ann, Daskalova, Gergana N., Thomas, Haydn J. D., Myers-Smith, Isla H., Blonder, Benjamin, Stephan, Jorg G., Descombes, Patrice, Zellweger, Florian, Frei, Esther R., Heinesch, Bernard, Andrews, Christopher, Dick, Jan, Siebicke, Lukas, Rocha, Adrian, Senior, Rebecca A., Rixen, Christian, Jimenez, Juan J., Boike, Julia, Pauchard, Anibal, Scholten, Thomas, Scheffers, Brett, Klinges, David, Basham, Edmund W., Zhang, Jian, Zhang, Zhaochen, Geron, Charly, Fazlioglu, Fatih, Candan, Onur, Sallo Bravo, Jhonatan, Hrbacek, Filip, Laska, Kamil, Cremonese, Edoardo, Haase, Peter, Moyano, Fernando E., Rossi, Christian, Nijs, Ivan, Lembrechts, Jonas J., Aalto, Juha, Ashcroft, Michael B., De Frenne, Pieter, Kopecky, Martin, Lenoir, Jonathan, Luoto, Miska, Maclean, Ilya M. D., Roupsard, Olivier, Fuentes-Lillo, Eduardo, Garcia, Rafael A., Pellissier, Loic, Pitteloud, Camille, Alatalo, Juha M., Smith, Stuart W., Bjork, Robert G., Muffler, Lena, Backes, Amanda Ratier, Cesarz, Simone, Gottschall, Felix, Okello, Joseph, Urban, Josef, Plichta, Roman, Svatek, Martin, Phartyal, Shyam S., Wipf, Sonja, Eisenhauer, Nico, Puscas, Mihai, Turtureanu, Pavel D., Varlagin, Andrej, Dimarco, Romina D., Jump, Alistair S., Randall, Krystal, Dorrepaal, Ellen, Larson, Keith, Walz, Josefine, Vitale, Luca, Svoboda, Miroslav, Higgens, Rebecca Finger, Halbritter, H., Curasi, Salvatore R., Klupar, Ian, Koontz, Austin, Pearse, William D., Simpson, Elizabeth, Stemkovski, Michael, Graae, Bente Jessen, Sorensen, Mia Vedel, Hoye, Toke T., Fernandez Calzado, M. Rosa, Lorite, Juan, Carbognani, Michele, Tomaselli, Marcello, Forte, T'ai G. W., Petraglia, Alessandro, Haesen, Stef, Somers, Ben, Van Meerbeek, Koenraad, Bjorkman, Mats P., Hylander, Kristoffer, Merinero, Sonia, Gharun, Mana, Buchmann, Nina, Dolezal, Jiri, Matula, Radim, Thomas, Andrew D., Bailey, Joseph J., Ghosn, Dany, Kazakis, George, de Pablo, Miguel A., Kemppinen, Julia, Niittynen, Pekka, Rew, Lisa, Seipel, Tim, Larson, Christian, Speed, James D. M., Ardo, Jonas, Cannone, Nicoletta, Guglielmin, Mauro, Malfasi, Francesco, Bader, Maaike Y., Canessa, Rafaella, Stanisci, Angela, Kreyling, Juergen, Schmeddes, Jonas, Teuber, Laurenz, Aschero, Valeria, Ciliak, Marek, Malis, Frantisek, De Smedt, Pallieter, Govaert, Sanne, Meeussen, Camille, Vangansbeke, Pieter, Gigauri, Khatuna, Lamprecht, Andrea, Pauli, Harald, Steinbauer, Klaus, Winkler, Manuela, Ueyama, Masahito, Nunez, Martin A., Ursu, Tudor-Mihai, Haider, Sylvia, Wedegartner, Ronja E. M., Smiljanic, Marko, Trouillier, Mario, Wilmking, Martin, Altman, Jan, Bruna, Josef, Hederova, Lucia, Macek, Martin, Man, Matej, Wild, Jan, Vittoz, Pascal, Partel, Meelis, Barancok, Peter, Kanka, Robert, Kollar, Jozef, Palaj, Andrej, Barros, Agustina, Mazzolari, Ana C., Bauters, Marijn, Boeckx, Pascal, Benito Alonso, Jose-Luis, Zong, Shengwei, Di Cecco, Valter, Sitkova, Zuzana, Tielboerger, Katja, van den Brink, Liesbeth, Weigel, Robert, Homeier, Juergen, Dahlberg, C. Johan, Medinets, Sergiy, Medinets, Volodymyr, De Boeck, Hans J., Portillo-Estrada, Miguel, Verryckt, Lore T., Milbau, Ann, Daskalova, Gergana N., Thomas, Haydn J. D., Myers-Smith, Isla H., Blonder, Benjamin, Stephan, Jorg G., Descombes, Patrice, Zellweger, Florian, Frei, Esther R., Heinesch, Bernard, Andrews, Christopher, Dick, Jan, Siebicke, Lukas, Rocha, Adrian, Senior, Rebecca A., Rixen, Christian, Jimenez, Juan J., Boike, Julia, Pauchard, Anibal, Scholten, Thomas, Scheffers, Brett, Klinges, David, Basham, Edmund W., Zhang, Jian, Zhang, Zhaochen, Geron, Charly, Fazlioglu, Fatih, Candan, Onur, Sallo Bravo, Jhonatan, Hrbacek, Filip, Laska, Kamil, Cremonese, Edoardo, Haase, Peter, Moyano, Fernando E., Rossi, Christian, and Nijs, Ivan

Abstract

Current analyses and predictions of spatially explicit patterns and processes in ecology most often rely on climate data interpolated from standardized weather stations. This interpolated climate data represents long‐term average thermal conditions at coarse spatial resolutions only. Hence, many climate‐forcing factors that operate at fine spatiotemporal resolutions are overlooked. This is particularly important in relation to effects of observation height (e.g. vegetation, snow and soil characteristics) and in habitats varying in their exposure to radiation, moisture and wind (e.g. topography, radiative forcing or cold‐air pooling). Since organisms living close to the ground relate more strongly to these microclimatic conditions than to free‐air temperatures, microclimatic ground and near‐surface data are needed to provide realistic forecasts of the fate of such organisms under anthropogenic climate change, as well as of the functioning of the ecosystems they live in. To fill this critical gap, we highlight a call for temperature time series submissions to SoilTemp, a geospatial database initiative compiling soil and near‐surface temperature data from all over the world. Currently, this database contains time series from 7,538 temperature sensors from 51 countries across all key biomes. The database will pave the way toward an improved global understanding of microclimate and bridge the gap between the available climate data and the climate at fine spatiotemporal resolutions relevant to most organisms and ecosystem processes.

Published
2020
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5. Tundra Trait Team:A database of plant traits spanning the tundra biome

Author

Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Thomas, Haydn J. D., Alatalo, Juha M., Alexander, Heather, Anadon-Rosell, Alba, Angers-Blondin, Sandra, Bai, Yang, Baruah, Gaurav, te Beest, Mariska, Berner, Logan, Bjork, Robert G., Blok, Daan, Bruelheide, Helge, Buchwal, Agata, Buras, Allan, Carbognani, Michele, Christie, Katherine, Collier, Laura S., Cooper, Elisabeth J., Cornelissen, J. Hans C., Dickinson, Katharine J. M., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Forbes, Bruce C., Frei, Esther R., Iturrate-Garcia, Maitane, Good, Megan K., Grau, Oriol, Green, Peter, Greve, Michelle, Grogan, Paul, Haider, Sylvia, Hajek, Tomas, Hallinger, Martin, Happonen, Konsta, Harper, Karen A., Heijmans, Monique M. P. D., Henry, Gregory H. R., Hermanutz, Luise, Hewitt, Rebecca E., Hollister, Robert D., Hudson, James, Huelber, Karl, Iversen, Colleen M., Jaroszynska, Francesca, Jimenez-Alfaro, Borja, Johnstone, Jill, Jorgensen, Rasmus Halfdan, Kaarlejarvi, Elina, Klady, Rebecca, Klimesova, Jitka, Korsten, Annika, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Lavalle, Amanda, Lembrechts, Jonas J., Levesque, Esther, Little, Chelsea J., Luoto, Miska, Macek, Petr, Mack, Michelle C., Mathakutha, Rabia, Michelsen, Anders, Milbau, Ann, Molau, Ulf, Morgan, John W., Morsdorf, Martin Alfons, Nabe-Nielsen, Jacob, Nielsen, Sigrid Scholer, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Petraglia, Alessandro, Pickering, Catherine, Prevey, Janet S., Rixen, Christian, Rumpf, Sabine B., Schaepman-Strub, Gabriela, Semenchuk, Philipp, Shetti, Rohan, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Speed, James David Mervyn, Street, Lorna E., Suding, Katharine, Tape, Ken D., Tomaselli, Marcello, Trant, Andrew, Treier, Urs A., Tremblay, Jean-Pierre, Tremblay, Maxime, Venn, Susanna, Virkkala, Anna-Maria, Vowles, Tage, Weijers, Stef, Wilmking, Martin, Wipf, Sonja, Zamin, Tara, Systems Ecology, Spatial Ecology and Global Change, and Environmental Sciences

Subjects
Ekologi, Chemistry, Arctic, plant functional traits, tundra, Ecology, Economics, Ecological Applications, alpine, VDP::Mathematics and natural science: 400::Zoology and botany: 480::Marine biology: 497, VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Marinbiologi: 497, Biology
Abstract

Motivation: The Tundra Trait Team (TTT) database includes field-based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade-offs, trait environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters. Main types of variable contained: The database contains 91,970 measurements of 18 plant traits. The most frequently measured traits (>1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Spatial location and grain: Measurements were collected in tundra habitats in both the Northern and Southern Hemispheres, including Arctic sites in Alaska, Canada, Greenland, Fennoscandia and Siberia, alpine sites in the European Alps, Colorado Rockies, Caucasus, Ural Mountains, Pyrenees, Australian Alps, and Central Otago Mountains (New Zealand), and sub-Antarctic Marion Island. More than 99% of observations are georeferenced. Time period and grain: All data were collected between 1964 and 2018. A small number of sites have repeated trait measurements at two or more time periods. Major taxa and level of measurement: Trait measurements were made on 978 terrestrial vascular plant species growing in tundra habitats. Most observations are on individuals (86%), while the remainder represent plot or site means or maximums per species. Software format: csv file and GitHub repository with data cleaning scripts in R; contribution to TRY plant trait database (www.try-db.org) to be included in the next version release. 2Ecoinformatics and Biodiversity, Department of Bioscience, Aarhus University, Aarhus, Denmark 3Senckenberg Gesellschaft fD?r Naturforschung, Biodiversity and Climate Research Centre (BiK?F), Frankfurt, Germany 4Department of Ecology and Evolutionary Biology, University of Colorado, Boulder, Colorado 5National Ecological Observatory Network, Boulder, Colorado 6Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado 7Arctic Research Center, Department of Bioscience, Aarhus University, Aarhus, Denmark 8Center for Biodiversity Dynamics in a Changing World (BIOCHANGE), Department of Bioscience, Aarhus University, Aarhus, Denmark 9Department of Biological and Environmental Sciences, Qatar University, Doha, Qatar 10Department of Forestry, Forest and Wildlife Research Center, Mississippi State University, Mississippi 11Department of Evolutionary Biology, Ecology and Environmental Sciences, University of Barcelona, Barcelona, Spain 12Biodiversity Research Institute, University of Barcelona, Barcelona, Spain 13Institute of Botany and Landscape Ecology, Greifswald University, Greifswald, Germany 14Center for Integrative Conservation, Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Xishuangbanna, China 15Department of Evolutionary Biology and Environmental Studies, University of Zurich, Zurich, Switzerland 16Department of Ecology and Environmental Science, Ume� University, Ume�, Sweden 17Environmental Sciences, Copernicus Institute of Sustainable Development, Utrecht University, Utrecht, The Netherlands 18School of Informatics, Computing, and Cyber Systems, Northern Arizona University, Flagstaff, Arizona 19Department of Earth Sciences, University of Gothenburg, Gothenburg, Sweden 20Gothenburg Global Biodiversity Centre, GD?teborg, Sweden 21Department of Physical Geography and Ecosystem Science, Lund University, Lund, Sweden 22Martin Luther University Halle?Wittenberg, Institute of Biology / Geobotany and Botanical Garden, Halle (Saale), Germany 23German Centre for Integrative Biodiversity Research (iDiv) Halle?Jena?Leipzig, Leipzig, Germany 24Adam Mickiewicz University, Institute of Geoecology and Geoinformation, Poznan, Poland 25University of Alaska Anchorage, Department of Biological Sciences, Anchorage, Alaska 26Technische Universit�t MD?nchen, Freising, Germany 27Department of Chemistry, Life Sciences and Environmental Sustainability, University of Parma, Parma, Italy 28The Alaska Department of Fish and Game, Anchorage, Alaska 29Department of Biology, Memorial University, St. John�s, Newfoundland and Labrador, Canada 30Department of Arctic and Marine Biology, Faculty of Biosciences, Fisheries and Economics, UiT? The Arctic University of Norway, Troms�, Norway 31Systems Ecology, Department of Ecological Science, Vrije Universiteit, Amsterdam, The Netherlands 32Department of Botany, University of Otago, Dunedin, New Zealand 33Department of Botany and Biodiversity Research, University of Vienna, Vienna, Austria 34Center for Permafrost (CENPERM), Department of Geosciences and Natural Resource Management, University of Copenhagen, Copenhagen, Denmark 35Department of Physiological Diversity, Helmholtz Centre for Environmental Research ? UFZ, Leipzig, Germany 36Department of Ecology and Genetics, University of Oulu, Oulu, Finland 37Arctic Centre, University of Lapland, Rovaniemi, Finland 38Swiss Federal Research Institute WSL, Birmensdorf, Switzerland 39Department of Geography, University of British Columbia, Vancouver, British Columbia, Canada 40Faculty of Science and Technology, Federation University, Ballarat, Victoria, Australia 41Global Ecology Unit, CREAF?CSIC?UAB, Bellaterra, Catalonia, Spain 42CREAF, Bellaterra, Cerdanyola del Vall�s, Catalonia, Spain 43Department of Ecology, Environment and Evolution, La Trobe University, Bundoora, Australia 44Department of Plant and Soil Sciences, University of Pretoria, Pretoria, South Africa 45Department of Biology, Queen�s University, Kingston, Ontario, Canada Scopus

Published
2018
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6. Tundra Trait Team : a database of plant traits spanning the tundra biome

Author

Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Thomas, Haydn J. D., Alatalo, Juha M., Alexander, Heather, Anadon-Rosell, Alba, Angers-Blondin, Sandra, Bai, Yang, Baruah, Gaurav, te Beest, Mariska, Berner, Logan, Bjork, Robert G., Blok, Daan, Bruelheide, Helge, Buchwal, Agata, Buras, Allan, Carbognani, Michele, Christie, Katherine, Collier, Laura S., Cooper, Elisabeth J., Cornelissen, J. Hans C., Dickinson, Katharine J. M., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Forbes, Bruce C., Frei, Esther R., Iturrate-Garcia, Maitane, Good, Megan K., Grau, Oriol, Green, Peter, Greve, Michelle, Grogan, Paul, Haider, Sylvia, Hajek, Tomas, Hallinger, Martin, Happonen, Konsta, Harper, Karen A., Heijmans, Monique M. P. D., Henry, Gregory H. R., Hermanutz, Luise, Hewitt, Rebecca E., Hollister, Robert D., Hudson, James, Huelber, Karl, Iversen, Colleen M., Jaroszynska, Francesca, Jimenez-Alfaro, Borja, Johnstone, Jill, Jorgensen, Rasmus Halfdan, Kaarlejarvi, Elina, Klady, Rebecca, Klimesova, Jitka, Korsten, Annika, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Lavalle, Amanda, Lembrechts, Jonas J., Levesque, Esther, Little, Chelsea J., Luoto, Miska, Macek, Petr, Mack, Michelle C., Mathakutha, Rabia, Michelsen, Anders, Milbau, Ann, Molau, Ulf, Morgan, John W., Morsdorf, Martin Alfons, Nabe-Nielsen, Jacob, Nielsen, Sigrid Scholer, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Petraglia, Alessandro, Pickering, Catherine, Prevey, Janet S., Rixen, Christian, Rumpf, Sabine B., Schaepman-Strub, Gabriela, Semenchuk, Philipp, Shetti, Rohan, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Speed, James David Mervyn, Street, Lorna E., Suding, Katharine, Tape, Ken D., Tomaselli, Marcello, Trant, Andrew, Treier, Urs A., Tremblay, Jean-Pierre, Tremblay, Maxime, Venn, Susanna, Virkkala, Anna-Maria, Vowles, Tage, Weijers, Stef, Wilmking, Martin, Wipf, Sonja, Zamin, Tara, Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Thomas, Haydn J. D., Alatalo, Juha M., Alexander, Heather, Anadon-Rosell, Alba, Angers-Blondin, Sandra, Bai, Yang, Baruah, Gaurav, te Beest, Mariska, Berner, Logan, Bjork, Robert G., Blok, Daan, Bruelheide, Helge, Buchwal, Agata, Buras, Allan, Carbognani, Michele, Christie, Katherine, Collier, Laura S., Cooper, Elisabeth J., Cornelissen, J. Hans C., Dickinson, Katharine J. M., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Forbes, Bruce C., Frei, Esther R., Iturrate-Garcia, Maitane, Good, Megan K., Grau, Oriol, Green, Peter, Greve, Michelle, Grogan, Paul, Haider, Sylvia, Hajek, Tomas, Hallinger, Martin, Happonen, Konsta, Harper, Karen A., Heijmans, Monique M. P. D., Henry, Gregory H. R., Hermanutz, Luise, Hewitt, Rebecca E., Hollister, Robert D., Hudson, James, Huelber, Karl, Iversen, Colleen M., Jaroszynska, Francesca, Jimenez-Alfaro, Borja, Johnstone, Jill, Jorgensen, Rasmus Halfdan, Kaarlejarvi, Elina, Klady, Rebecca, Klimesova, Jitka, Korsten, Annika, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Lavalle, Amanda, Lembrechts, Jonas J., Levesque, Esther, Little, Chelsea J., Luoto, Miska, Macek, Petr, Mack, Michelle C., Mathakutha, Rabia, Michelsen, Anders, Milbau, Ann, Molau, Ulf, Morgan, John W., Morsdorf, Martin Alfons, Nabe-Nielsen, Jacob, Nielsen, Sigrid Scholer, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Petraglia, Alessandro, Pickering, Catherine, Prevey, Janet S., Rixen, Christian, Rumpf, Sabine B., Schaepman-Strub, Gabriela, Semenchuk, Philipp, Shetti, Rohan, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Speed, James David Mervyn, Street, Lorna E., Suding, Katharine, Tape, Ken D., Tomaselli, Marcello, Trant, Andrew, Treier, Urs A., Tremblay, Jean-Pierre, Tremblay, Maxime, Venn, Susanna, Virkkala, Anna-Maria, Vowles, Tage, Weijers, Stef, Wilmking, Martin, Wipf, Sonja, and Zamin, Tara

Abstract

Motivation: The Tundra Trait Team (TTT) database includes field‐based measurements of key traits related to plant form and function at multiple sites across the tundra biome. This dataset can be used to address theoretical questions about plant strategy and trade‐offs, trait–environment relationships and environmental filtering, and trait variation across spatial scales, to validate satellite data, and to inform Earth system model parameters. Main types of variable contained: The database contains 91,970 measurements of 18 plant traits. The most frequently measured traits (> 1,000 observations each) include plant height, leaf area, specific leaf area, leaf fresh and dry mass, leaf dry matter content, leaf nitrogen, carbon and phosphorus content, leaf C:N and N:P, seed mass, and stem specific density. Spatial location and grain: Measurements were collected in tundra habitats in both the Northern and Southern Hemispheres, including Arctic sites in Alaska, Canada, Greenland, Fennoscandia and Siberia, alpine sites in the European Alps, Colorado Rockies, Caucasus, Ural Mountains, Pyrenees, Australian Alps, and Central Otago Mountains (New Zealand), and sub‐Antarctic Marion Island. More than 99% of observations are georeferenced. Time period and grain: All data were collected between 1964 and 2018. A small number of sites have repeated trait measurements at two or more time periods. Major taxa and level of measurement: Trait measurements were made on 978 terrestrial vascular plant species growing in tundra habitats. Most observations are on individuals (86%), while the remainder represent plot or site means or maximums per species. Software format: csv file and GitHub repository with data cleaning scripts in R; contribution to TRY plant trait database (www.try-db.org) to be included in the next version release.

Published
2018
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7. Patchy field sampling biases understanding of climate change impacts across the Arctic

Author

Metcalfe, Daniel B., Hermans, Thirze D. G., Ahlstrand, Jenny, Becker, Michael, Berggren, Martin, Bjork, Robert G., Björkman, Mats P., Blok, Daan, Chaudhary, Nitin, Chisholm, Chelsea, Classen, Aimee T., Hasselquist, Niles J., Jonsson, Micael, Kristensen, Jeppe A., Kumordzi, Bright B., Lee, Hanna, Mayor, Jordan R., Prevey, Janet, Pantazatou, Karolina, Rousk, Johannes, Sponseller, Ryan A., Sundqvist, Maja K., Tang, Jing, Uddling, Johan, Wallin, Göran, Zhang, Wenxin, Ahlström, Anders, Tenenbaum, David E., Abdi, Abdulhakim M., Metcalfe, Daniel B., Hermans, Thirze D. G., Ahlstrand, Jenny, Becker, Michael, Berggren, Martin, Bjork, Robert G., Björkman, Mats P., Blok, Daan, Chaudhary, Nitin, Chisholm, Chelsea, Classen, Aimee T., Hasselquist, Niles J., Jonsson, Micael, Kristensen, Jeppe A., Kumordzi, Bright B., Lee, Hanna, Mayor, Jordan R., Prevey, Janet, Pantazatou, Karolina, Rousk, Johannes, Sponseller, Ryan A., Sundqvist, Maja K., Tang, Jing, Uddling, Johan, Wallin, Göran, Zhang, Wenxin, Ahlström, Anders, Tenenbaum, David E., and Abdi, Abdulhakim M.

Abstract

Effective societal responses to rapid climate change in the Arctic rely on an accurate representation of region-specific ecosystem properties and processes. However, this is limited by the scarcity and patchy distribution of field measurements. Here, we use a comprehensive, geo-referenced database of primary field measurements in 1,840 published studies across the Arctic to identify statistically significant spatial biases in field sampling and study citation across this globally important region. We find that 31% of all study citations are derived from sites located within 50 km of just two research sites: Toolik Lake in the USA and Abisko in Sweden. Furthermore, relatively colder, more rapidly warming and sparsely vegetated sites are under-sampled and under-recognized in terms of citations, particularly among microbiology-related studies. The poorly sampled and cited areas, mainly in the Canadian high-Arctic archipelago and the Arctic coastline of Russia, constitute a large fraction of the Arctic ice-free land area. Our results suggest that the current pattern of sampling and citation may bias the scientific consensuses that underpin attempts to accurately predict and effectively mitigate climate change in the region. Further work is required to increase both the quality and quantity of sampling, and incorporate existing literature from poorly cited areas to generate a more representative picture of Arctic climate change and its environmental impacts.

Published
2018
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8. Plant functional trait change across a warming tundra biome

Author

Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Rueger, Nadja, Beck, Pieter S. A., Blach-Overgaard, Anne, Blok, Daan, Cornelissen, J. Hans C., Forbes, Bruce C., Georges, Damien, Goetz, Scott J., Guay, Kevin C., Henry, Gregory H. R., HilleRisLambers, Janneke, Hollister, Robert D., Karger, Dirk N., Kattge, Jens, Manning, Peter, Prevey, Janet S., Rixen, Christian, Schaepman-Strub, Gabriela, Thomas, Haydn J. D., Vellend, Mark, Wilmking, Martin, Wipf, Sonja, Carbognani, Michele, Hermanutz, Luise, Levesque, Esther, Molau, Ulf, Petraglia, Alessandro, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Tomaselli, Marcello, Vowles, Tage, Alatalo, Juha M., Alexander, Heather D., Anadon-Rosell, Alba, Angers-Blondin, Sandra, te Beest, Mariska, Berner, Logan, Bjork, Robert G., Buchwal, Agata, Buras, Allan, Christie, Katherine, Cooper, Elisabeth J., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Frei, Esther R., Grau, Oriol, Grogan, Paul, Hallinger, Martin, Harper, Karen A., Heijmans, Monique M. P. D., Hudson, James, Huelber, Karl, Iturrate-Garcia, Maitane, Iversen, Colleen M., Jaroszynska, Francesca, Johnstone, Jill F., Jorgensen, Rasmus Halfdan, Kaarlejärvi, Elina, Klady, Rebecca, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Little, Chelsea J., Speed, James D. M., Michelsen, Anders, Milbau, Ann, Nabe-Nielsen, Jacob, Nielsen, Sigrid Scholer, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Rumpf, Sabine B., Semenchuk, Philipp, Shetti, Rohan, Collier, Laura Siegwart, Street, Lorna E., Suding, Katharine N., Tape, Ken D., Trant, Andrew, Treier, Urs A., Tremblay, Jean-Pierre, Tremblay, Maxime, Venn, Susanna, Weijers, Stef, Zamin, Tara, Boulanger-Lapointe, Noemie, Gould, William A., Hik, David S., Hofgaard, Annika, Jonsdottir, Ingibjorg S., Jorgenson, Janet, Klein, Julia, Magnusson, Borgthor, Tweedie, Craig, Wookey, Philip A., Bahn, Michael, Blonder, Benjamin, van Bodegom, Peter M., Bond-Lamberty, Benjamin, Campetella, Giandiego, Cerabolini, Bruno E. L., Chapin, F. Stuart, III, Cornwell, William K., Craine, Joseph, Dainese, Matteo, de Vries, Franciska T., Diaz, Sandra, Enquist, Brian J., Green, Walton, Milla, Ruben, Niinemets, Ulo, Onoda, Yusuke, Ordonez, Jenny C., Ozinga, Wim A., Penuelas, Josep, Poorter, Hendrik, Poschlod, Peter, Reich, Peter B., Sande, Brody, Schamp, Brandon, Sheremetev, Serge, Weiher, Evan, Bjorkman, Anne D., Myers-Smith, Isla H., Elmendorf, Sarah C., Normand, Signe, Rueger, Nadja, Beck, Pieter S. A., Blach-Overgaard, Anne, Blok, Daan, Cornelissen, J. Hans C., Forbes, Bruce C., Georges, Damien, Goetz, Scott J., Guay, Kevin C., Henry, Gregory H. R., HilleRisLambers, Janneke, Hollister, Robert D., Karger, Dirk N., Kattge, Jens, Manning, Peter, Prevey, Janet S., Rixen, Christian, Schaepman-Strub, Gabriela, Thomas, Haydn J. D., Vellend, Mark, Wilmking, Martin, Wipf, Sonja, Carbognani, Michele, Hermanutz, Luise, Levesque, Esther, Molau, Ulf, Petraglia, Alessandro, Soudzilovskaia, Nadejda A., Spasojevic, Marko J., Tomaselli, Marcello, Vowles, Tage, Alatalo, Juha M., Alexander, Heather D., Anadon-Rosell, Alba, Angers-Blondin, Sandra, te Beest, Mariska, Berner, Logan, Bjork, Robert G., Buchwal, Agata, Buras, Allan, Christie, Katherine, Cooper, Elisabeth J., Dullinger, Stefan, Elberling, Bo, Eskelinen, Anu, Frei, Esther R., Grau, Oriol, Grogan, Paul, Hallinger, Martin, Harper, Karen A., Heijmans, Monique M. P. D., Hudson, James, Huelber, Karl, Iturrate-Garcia, Maitane, Iversen, Colleen M., Jaroszynska, Francesca, Johnstone, Jill F., Jorgensen, Rasmus Halfdan, Kaarlejärvi, Elina, Klady, Rebecca, Kuleza, Sara, Kulonen, Aino, Lamarque, Laurent J., Lantz, Trevor, Little, Chelsea J., Speed, James D. M., Michelsen, Anders, Milbau, Ann, Nabe-Nielsen, Jacob, Nielsen, Sigrid Scholer, Ninot, Josep M., Oberbauer, Steven F., Olofsson, Johan, Onipchenko, Vladimir G., Rumpf, Sabine B., Semenchuk, Philipp, Shetti, Rohan, Collier, Laura Siegwart, Street, Lorna E., Suding, Katharine N., Tape, Ken D., Trant, Andrew, Treier, Urs A., Tremblay, Jean-Pierre, Tremblay, Maxime, Venn, Susanna, Weijers, Stef, Zamin, Tara, Boulanger-Lapointe, Noemie, Gould, William A., Hik, David S., Hofgaard, Annika, Jonsdottir, Ingibjorg S., Jorgenson, Janet, Klein, Julia, Magnusson, Borgthor, Tweedie, Craig, Wookey, Philip A., Bahn, Michael, Blonder, Benjamin, van Bodegom, Peter M., Bond-Lamberty, Benjamin, Campetella, Giandiego, Cerabolini, Bruno E. L., Chapin, F. Stuart, III, Cornwell, William K., Craine, Joseph, Dainese, Matteo, de Vries, Franciska T., Diaz, Sandra, Enquist, Brian J., Green, Walton, Milla, Ruben, Niinemets, Ulo, Onoda, Yusuke, Ordonez, Jenny C., Ozinga, Wim A., Penuelas, Josep, Poorter, Hendrik, Poschlod, Peter, Reich, Peter B., Sande, Brody, Schamp, Brandon, Sheremetev, Serge, and Weiher, Evan

Abstract

The tundra is warming more rapidly than any other biome on Earth, and the potential ramifications are far-reaching because of global feedback effects between vegetation and climate. A better understanding of how environmental factors shape plant structure and function is crucial for predicting the consequences of environmental change for ecosystem functioning. Here we explore the biome-wide relationships between temperature, moisture and seven key plant functional traits both across space and over three decades of warming at 117 tundra locations. Spatial temperature-trait relationships were generally strong but soil moisture had a marked influence on the strength and direction of these relationships, highlighting the potentially important influence of changes in water availability on future trait shifts in tundra plant communities. Community height increased with warming across all sites over the past three decades, but other traits lagged far behind predicted rates of change. Our findings highlight the challenge of using space-for-time substitution to predict the functional consequences of future warming and suggest that functions that are tied closely to plant height will experience the most rapid change. They also reveal the strength with which environmental factors shape biotic communities at the coldest extremes of the planet and will help to improve projections of functional changes in tundra ecosystems with climate warming.

Published
2018
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9. Reindeer grazing has contrasting effect on species traits in Vaccinium vitis-idaea L. and Bistorta vivipara (L.) Gray

Author

Lindwall, Frida, Vowels, Tage, Ekblad, Alf, Bjork, Robert G., Lindwall, Frida, Vowels, Tage, Ekblad, Alf, and Bjork, Robert G.

Abstract

That reindeer grazing can have large effects on plant communities is well known, but how reindeer grazing affects plant traits and plant carbon (C) and nitrogen (N) allocation has not been studied to the same extent. This study was conducted in a sub-arctic dry heath in northern Sweden. 17-year-old reindeer exclosures were used to test whether reindeer grazing affects the C:N ratio (a plant quality index), and the delta C-13 and delta N-15 (indicators of changes in C and N dynamics) as well as the C and N content of above- and below ground parts of the evergreen dwarf shrub Vaccinium vitis-idaea L. and the perennial forb Bistorta vivipara (L) Gray. A lower C:N ratio was found in B. vivipara compared to V. vitis-idaea suggesting a higher grazing pressure on that species. We found that grazing reduced the total C content, by 26%, and increased the delta N-15, by 1 parts per thousand, in the leaves of B. vivipara, while no changes were observed in V. vitis-idaea. Fine roots of B. vivipara had higher delta C-13 (1 parts per thousand) and delta N-15 (2.5 parts per thousand) than the leaves, while such differences were not found in V. vitis-idaea. The results also highlight the importance of analysing both above- and belowground plant parts when interpreting natural variations in delta C-13 and delta N-15. (C) 2013 The Authors. Published by Elsevier Masson SAS. All rights reserved., Funding Agency: Strategic research area BECC (Biodiversity and Ecosystems in a Changing Climate) (se även Forskningsfinansiär)

Published
2013
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10. Global assessment of experimental climate warming on tundra vegetation : heterogeneity over space and time

Author

Elmendorf, Sarah C., Henry, Gregory H. R., Hollister, Robert D., Alatalo, Juha, Bjork, Robert G., Bjorkman, Anne D., Callaghan, Terry V., Collier, Laura Siegwart, Cooper, Elisabeth J., Cornelissen, Johannes H. C., Day, Thomas A., Fosaa, Anna Maria, Gould, William A., Gretarsdottir, Jarngerdur, Harte, John, Hermanutz, Luise, Hik, David S., Hofgaard, Annika, Jarrad, Frith, Jonsdottir, Ingibjorg Svala, Keuper, Frida, Klanderud, Kari, Klein, Julia A., Koh, Saewan, Kudo, Gaku, Lang, Simone I., Loewen, Val, May, Jeremy L., Mercado, Joel, Michelsen, Anders, Molau, Ulf, Myers-Smith, Isla H., Oberbauer, Steven F., Pieper, Sara, Post, Eric, Rixen, Christian, Robinson, Clare H., Schmidt, Niels Martin, Shaver, Gaius R., Stenstrom, Anna, Tolvanen, Anne, Totland, Orjan, Troxler, Tiffany, Wahren, Carl-Henrik, Walker, Marilyn D., Webber, Patrick J., Welker, Jeffery M., Wookey, Philip A., Elmendorf, Sarah C., Henry, Gregory H. R., Hollister, Robert D., Alatalo, Juha, Bjork, Robert G., Bjorkman, Anne D., Callaghan, Terry V., Collier, Laura Siegwart, Cooper, Elisabeth J., Cornelissen, Johannes H. C., Day, Thomas A., Fosaa, Anna Maria, Gould, William A., Gretarsdottir, Jarngerdur, Harte, John, Hermanutz, Luise, Hik, David S., Hofgaard, Annika, Jarrad, Frith, Jonsdottir, Ingibjorg Svala, Keuper, Frida, Klanderud, Kari, Klein, Julia A., Koh, Saewan, Kudo, Gaku, Lang, Simone I., Loewen, Val, May, Jeremy L., Mercado, Joel, Michelsen, Anders, Molau, Ulf, Myers-Smith, Isla H., Oberbauer, Steven F., Pieper, Sara, Post, Eric, Rixen, Christian, Robinson, Clare H., Schmidt, Niels Martin, Shaver, Gaius R., Stenstrom, Anna, Tolvanen, Anne, Totland, Orjan, Troxler, Tiffany, Wahren, Carl-Henrik, Walker, Marilyn D., Webber, Patrick J., Welker, Jeffery M., and Wookey, Philip A.

Abstract

Understanding the sensitivity of tundra vegetation to climate warming is critical to forecasting future biodiversity and vegetation feedbacks to climate. In situ warming experiments accelerate climate change on a small scale to forecast responses of local plant communities. Limitations of this approach include the apparent site-specificity of results and uncertainty about the power of short-term studies to anticipate longer term change. We address these issues with a synthesis of 61 experimental warming studies, of up to 20 years duration, in tundra sites worldwide. The response of plant groups to warming often differed with ambient summer temperature, soil moisture and experimental duration. Shrubs increased with warming only where ambient temperature was high, whereas graminoids increased primarily in the coldest study sites. Linear increases in effect size over time were frequently observed. There was little indication of saturating or accelerating effects, as would be predicted if negative or positive vegetation feedbacks were common. These results indicate that tundra vegetation exhibits strong regional variation in response to warming, and that in vulnerable regions, cumulative effects of long-term warming on tundra vegetation and associated ecosystem consequences have the potential to be much greater than we have observed to date., The following authors were added to this article (see correction below):Alatalo, JuhaWalker, MarilynCorrection in: Ecology Letters, Vol. 17, Issue 2, page 260 (Feb 2014).DOI: 10.1111/ele.12218

Published
2012
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11. Plot-scale evidence of tundra vegetation change and links to recent summer warming

Author

Elmendorf, Sarah C., Henry, Gregory H. R., Hollister, Robert D., Bjork, Robert G., Boulanger-Lapointe, Noemie, Cooper, Elisabeth J., Cornelissen, Johannes H. C., Day, Thomas A., Dorrepaal, Ellen, Elumeeva, Tatiana G., Gill, Mike, Gould, William A., Harte, John, Hik, David S., Hofgaard, Annika, Johnson, David R., Johnstone, Jill F., Jonsdottir, Ingibjorg Svala, Jorgenson, Janet C., Klanderud, Kari, Klein, Julia A., Koh, Saewan, Kudo, Gaku, Lara, Mark, Levesque, Esther, Magnusson, Borgthor, May, Jeremy L., Mercado-Diaz, Joel A., Michelsen, Anders, Molau, Ulf, Myers-Smith, Isla H., Oberbauer, Steven F., Onipchenko, Vladimir G., Rixen, Christian, Schmidt, Niels Martin, Shaver, Gaius R., Spasojevic, Marko J., Porhallsdottir, Pora Ellen, Tolvanen, Anne, Troxler, Tiffany, Tweedie, Craig E., Villareal, Sandra, Wahren, Carl-Henrik, Walker, Xanthe, Webber, Patrick J., Welker, Jeffrey M., Wipf, Sonja, Elmendorf, Sarah C., Henry, Gregory H. R., Hollister, Robert D., Bjork, Robert G., Boulanger-Lapointe, Noemie, Cooper, Elisabeth J., Cornelissen, Johannes H. C., Day, Thomas A., Dorrepaal, Ellen, Elumeeva, Tatiana G., Gill, Mike, Gould, William A., Harte, John, Hik, David S., Hofgaard, Annika, Johnson, David R., Johnstone, Jill F., Jonsdottir, Ingibjorg Svala, Jorgenson, Janet C., Klanderud, Kari, Klein, Julia A., Koh, Saewan, Kudo, Gaku, Lara, Mark, Levesque, Esther, Magnusson, Borgthor, May, Jeremy L., Mercado-Diaz, Joel A., Michelsen, Anders, Molau, Ulf, Myers-Smith, Isla H., Oberbauer, Steven F., Onipchenko, Vladimir G., Rixen, Christian, Schmidt, Niels Martin, Shaver, Gaius R., Spasojevic, Marko J., Porhallsdottir, Pora Ellen, Tolvanen, Anne, Troxler, Tiffany, Tweedie, Craig E., Villareal, Sandra, Wahren, Carl-Henrik, Walker, Xanthe, Webber, Patrick J., Welker, Jeffrey M., and Wipf, Sonja

Abstract

Temperature is increasing at unprecedented rates across most of the tundra biome(1). Remote-sensing data indicate that contemporary climate warming has already resulted in increased productivity over much of the Arctic(2,3), but plot-based evidence for vegetation transformation is not widespread. We analysed change in tundra vegetation surveyed between 1980 and 2010 in 158 plant communities spread across 46 locations. We found biome-wide trends of increased height of the plant canopy and maximum observed plant height for most vascular growth forms; increased abundance of litter; increased abundance of evergreen, low-growing and tall shrubs; and decreased abundance of bare ground. Intersite comparisons indicated an association between the degree of summer warming and change in vascular plant abundance, with shrubs, forbs and rushes increasing with warming. However, the association was dependent on the climate zone, the moisture regime and the presence of permafrost. Our data provide plot-scale evidence linking changes in vascular plant abundance to local summer warming in widely dispersed tundra locations across the globe.

Published
2012
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12. Establishment of boreal forest species in alpine dwarf-shrub heath in subarctic Sweden

Author

Sundqvist, Maja K., Bjork, Robert G., Molau, Ulf, Sundqvist, Maja K., Bjork, Robert G., and Molau, Ulf

Abstract

Background: Saplings of mountain birch ( Betula pubescens ssp. czerepanovii) have established in pockets of dwarf-shrub heath approximately 250 m above the treeline in the Latnjavagge Valley, northern Sweden. Aim: We examined if the establishment of these mountain birch outposts was related to favourable local microclimate, and if birch establishment has affected the surrounding vegetation, changing it from dwarf-shrub heath to more akin to birch forest floor. Methods: Daily mean and mean maximum temperatures were compared for two sites in the dwarf-shrub heath ( 990 m a. s. l., few birch saplings; 1060 m a. s. l., numerous birch saplings) between January 2005 and June 2006. The cover-abundance of vascular plants was estimated in sample plots in dwarf-shrub heath with mountain birch, dwarf-shrub heath without mountain birch, in heath between the upper limit of closed mountain birch forest and the treeline, and in closed mountain birch forest. Species composition and diversity were statistically compared. The presence in the dwarf-shrub heath of boreal montane species other than birch was also noted. Results: The higher elevation site, containing a higher density of birch, had a significantly higher growing season temperature than the lower elevation site. There was a significant difference in plant community composition between the alpine heath plots containing mountain birch saplings and plots without mountain birch, alpine heath with birch being more similar to the plots of the treeline ecotone and the birch forest than to alpine heath without birch. No significant difference in species diversity among plots in dwarf-shrub heath was found and species diversity increased with altitude. A number of montane species were observed in the dwarf-shrub heath, however, their distribution was not associated with that of the mountain birch. Conclusions: This study provides evidence for favourable microclimate being a key driver for the establishment of mountain birch above t

Published
2008
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