Directional trends in species composition over time can lead to a widespread overemphasis of year-to-year asynchrony
Valencia, Enrique (Universidad Rey Juan Carlos. Departamento de Biologia, Geología, Física y Química Inorgánica)
De Bello, Francesco (University of South Bohemia. Department of Botany (Czech Republic))
Lepš, Jan (University of South Bohemia. Department of Botany (Czech Republic))
Galland, Thomas (University of South Bohemia. Department of Botany (Czech Republic))
E-Vojtkó, Anna (University of South Bohemia. Department of Botany (Czech Republic))
Conti, Luisa (Czech Academy of Sciences. Institute of Botany)
Danihelka, Jiří (Masaryk University. Department of Botany and Zoology (Czech Republic))
Dengler, Jürgen (Zurich University of Applied Sciences. Institute of Natural Resource Sciences (Switzerland))
Eldridge, David J. (University of New South Wales. Biological, Earth and Environmental Sciences (Australia))
Estiarte, Marc (Centre de Recerca Ecològica i d'Aplicacions Forestals)
García-González, Ricardo (Instituto Pirenaico de Ecología)
Garnier, Eric (Centre National de la Recherche Scientifique (França))
Gómez, Daniel (Instituto Pirenaico de Ecología)
Harrison, Susan (University of California Davis. Department of Environmental Science and Policy (USA))
Herben, Tomas (Charles University. Department of Botany (Czech Republic))
Ibáñez, Ricardo (Universidad de Navarra. Departamento de Biología Ambiental)
Jentsch, Anke (University of Bayreuth. Bayreuth Center of Ecology and Environmental Research. Department of Disturbance Ecology (Germany))
Juergens, Norbert (University of Hamburg. Institute for Plant Science and Microbiology (Germany))
Kertész, Miklós (MTA Centre for Ecological Research (Hungary))
Klumpp, Katja (INRAE. Université Clermont Auvergne (France))
Louault, Frédérique (INRAE. Université Clermont Auvergne (France))
Marrs, Rob H. (University of Liverpool (UK))
Ónodi, Gábor (MTA Centre for Ecological Research (Hungary))
Pakeman, Robin J. (The James Hutton Institute (UK))
Pärtel, Meelis (University of Tartu. Institute of Ecology and Earth Sciences. Department of Botany (Estonia))
Peco, Begoña (Universidad Autónoma de Madrid. Instituto de Biodiversidad y Cambio Global)
Peñuelas, Josep (Centre de Recerca Ecològica i d'Aplicacions Forestals)
Rueda, Marta (Estación Biológica de Doñana. Departamento de Conservación Biológica)
Schmidt, Wolfgang (University of Göttingen. Department of Silviculture and Forest Ecology of the Temperate Zones (Germany))
Schmiedel, Ute (University of Hamburg. Institute for Plant Science and Microbiology (Germany))
Schuetz, Martin (Swiss Federal Institute for Forest. Snow and Landscape Research)
Skalova, Hana (Academy of Sciences of the Czech Republic. Institute of Botany (Czech Republic))
Šmilauer, Petr (University of South Bohemia. Department of Ecosystem Biology (Czech Republic))
Šmilauerová, Marie (University of South Bohemia. Department of Botany (Czech Republic))
Smit, Christian (Groningen Institute for Evolutionary Life Sciences (The Netherlands))
Song, Ming-Hua (Chinese Academy of Sciences. Institute of Geographic Sciences and Natural Resources Research)
Stock, Martin (Wadden Sea National Park of Schleswig-Holstein (Germany))
Val, James (University of New South Wales. Biological, Earth and Environmental Sciences (Australia))
Vandvik, Vigdis (University of Bergen. Department of Biological Sciences (Norway))
Wesche, Karsten (Technische Universität Dresden. International Institute Zittau (Germany))
Woodcock, Ben A. (NERC Centre for Ecology and Hydrology (UK))
Young, Truman P. (University of California. Department of Plant Sciences (USA))
Yu, Fei-Hai (Taizhou University. Institute of Wetland Ecology & Clone Ecology (China))
Zobel, Martin (University of Tartu. Institute of Ecology and Earth Sciences (Estonia))
Götzenberger, Lars (Czech Academy of Sciences. Institute of Botany)

Date:	2020
Abstract:	Questions. Compensatory dynamics are described as one of the main mechanisms that increase community stability, e. g. , where decreases of some species on a year-to-year basis are offset by an increase in others. Deviations from perfect synchrony between species (asynchrony) have therefore been advocated as an important mechanism underlying biodiversity effects on stability. However, it is unclear to what extent existing measures of synchrony actually capture the signal of year-to-year species fluctuations in the presence of long-term directional trends in both species abundance and composition (species directional trends hereafter). Such directional trends may lead to a misinterpretation of indices commonly used to reflect year-to-year synchrony. Methods. An approach based on three-term local quadrat variance (T3) which assesses population variability in a three-year moving window, was used to overcome species directional trend effects. This "detrending" approach was applied to common indices of synchrony across a worldwide collection of 77 temporal plant community datasets comprising almost 7,800 individual plots sampled for at least six years. Plots included were either maintained under constant "control" conditions over time or were subjected to different management or disturbance treatments. Results. Accounting for directional trends increased the detection of year-to-year synchronous patterns in all synchrony indices considered. Specifically, synchrony values increased significantly in ~40% of the datasets with the T3 detrending approach while in ~10% synchrony decreased. For the 38 studies with both control and manipulated conditions, the increase in synchrony values was stronger for longer time series, particularly following experimental manipulation. Conclusions. Species' long-term directional trends can affect synchrony and stability measures potentially masking the ecological mechanism causing year-to-year fluctuations. As such, previous studies on community stability might have overemphasised the role of compensatory dynamics in real-world ecosystems, and particularly in manipulative conditions, when not considering the possible overriding effects of long-term directional trends.
Grants:	Ministerio de Economía y Competitividad CGL2014-53789-R European Commission 610028
Rights:	Tots els drets reservats.
Language:	Anglès
Document:	Article ; recerca ; Versió acceptada per publicar
Subject:	Asynchrony ; Biodiversity ; Stability ; Synchrony ; Temporal dynamics ; Year-to-year fluctuation
Published in:	Journal of vegetation science, Vol. 31, Issue 5 (September 2020) , p. 709-802, ISSN 1654-1103

DOI: 10.1111/jvs.12916

Postprint 143 p, 2.7 MB

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