Global change re-structures alpine plant communities through interacting abiotic and biotic effects.

Autor: Collins CG; Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA.; Biodiversity Research Centre, University of British Columbia, Vancouver, British Columbia, Canada., Elmendorf SC; Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA., Smith JG; Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA., Shoemaker L; Department of Botany, University of Wyoming, Laramie, Wyoming, USA., Szojka M; Department of Botany, University of Wyoming, Laramie, Wyoming, USA., Swift M; Nicholas School of the Environment, Duke University, Durham, North Carolina, USA., Suding KN; Institute of Arctic and Alpine Research, University of Colorado, Boulder, Colorado, USA.
Jazyk: angličtina
Zdroj: Ecology letters [Ecol Lett] 2022 Aug; Vol. 25 (8), pp. 1813-1826. Date of Electronic Publication: 2022 Jun 28.
DOI: 10.1111/ele.14060
Abstrakt: Global change is altering patterns of community assembly, with net outcomes dependent on species' responses to the abiotic environment, both directly and mediated through biotic interactions. Here, we assess alpine plant community responses in a 15-year factorial nitrogen addition, warming and snow manipulation experiment. We used a dynamic competition model to estimate the density-dependent and -independent processes underlying changes in species-group abundances over time. Density-dependent shifts in competitive interactions drove long-term changes in abundance of species-groups under global change while counteracting environmental drivers limited the growth response of the dominant species through density-independent mechanisms. Furthermore, competitive interactions shifted with the environment, primarily with nitrogen and drove non-linear abundance responses across environmental gradients. Our results highlight that global change can either reshuffle species hierarchies or further favour already-dominant species; predicting which outcome will occur requires incorporating both density-dependent and -independent mechanisms and how they interact across multiple global change factors.
(© 2022 John Wiley & Sons Ltd.)
Databáze: MEDLINE
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