Biotic rescaling reveals importance of species interactions for variation in biodiversity responses to climate change.

Autor:	Vandvik V; Department of Biological Sciences, University of Bergen, 5008 Bergen, Norway; vigdis.vandvik@uib.no.; Bjerknes Centre for Climate Research, University of Bergen, 5008 Bergen, Norway., Skarpaas O; Natural History Museum, University of Oslo, N-0318 Oslo, Norway.; Norwegian Institute for Nature Research (NINA) Oslo, Norwegian Institute for Nature Research, N-0349 Oslo, Norway., Klanderud K; Faculty of Environmental Sciences and Natural Resource Management, Norwegian University of Life Sciences, N-1432 Ås, Norway., Telford RJ; Department of Biological Sciences, University of Bergen, 5008 Bergen, Norway.; Bjerknes Centre for Climate Research, University of Bergen, 5008 Bergen, Norway., Halbritter AH; Department of Biological Sciences, University of Bergen, 5008 Bergen, Norway.; Bjerknes Centre for Climate Research, University of Bergen, 5008 Bergen, Norway., Goldberg DE; Department of Ecology and Evolutionary Biology, University of Michigan, Ann Arbor, MI 48104.
Jazyk:	angličtina
Zdroj:	Proceedings of the National Academy of Sciences of the United States of America [Proc Natl Acad Sci U S A] 2020 Sep 15; Vol. 117 (37), pp. 22858-22865. Date of Electronic Publication: 2020 Aug 31.
DOI:	10.1073/pnas.2003377117
Abstrakt:	Generality in understanding biodiversity responses to climate change has been hampered by substantial variation in the rates and even directions of response to a given change in climate. We propose that such context dependencies can be clarified by rescaling climate gradients in terms of the underlying biological processes, with biotic interactions as a particularly important process. We tested this rescaling approach in a replicated field experiment where entire montane grassland communities were transplanted in the direction of expected temperature and/or precipitation change. In line with earlier work, we found considerable variation across sites in community dynamics in response to climate change. However, these complex context dependencies could be substantially reduced or eliminated by rescaling climate drivers in terms of proxies of plant-plant interactions. Specifically, bryophytes limited colonization by new species into local communities, whereas the cover of those colonists, along with bryophytes, were the primary drivers of local extinctions. These specific interactions are relatively understudied, suggesting important directions for future work in similar systems. More generally, the success of our approach in explaining and simplifying landscape-level variation in climate change responses suggests that developing and testing proxies for relevant underlying processes could be a fruitful direction for building more general models of biodiversity response to climate change. Competing Interests: The authors declare no competing interest. (Copyright © 2020 the Author(s). Published by PNAS.)
Databáze:	MEDLINE
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