Community turnover by composition and climatic affinity across scales in an alpine system

Premise Examining community turnover across climate gradients at multiple scales is vital to understanding biogeographic response to climate change. This approach is especially important for alpine plants in which the relative roles of topographic complexity and nonclimatic or stochastic factors var...

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Vydáno v:	American journal of botany Ročník 107; číslo 2; s. 239 - 249
Hlavní autoři:	Smithers, Brian V., Oldfather, Meagan F., Koontz, Michael J., Bishop, Jim, Bishop, Catie, Nachlinger, Jan, Sheth, Seema N.
Médium:	Journal Article
Jazyk:	angličtina
Vydáno:	United States Botanical Society of America, Inc 01.02.2020
Témata:	alpine ecology alpine plants beta diversity Biodiversity botany California Climate Change climatic niche mean community assembly Community composition community structure Composition Contours Ecosystem Elevation elevation gradient geographical distribution Global Observation Research Initiative in Alpine Environments GLORIA Great Basin habitats Microclimate Mountains Niches Plant communities Plants species turnover White Mountains California beta diversity species turnover Global Observation Research Initiative in Alpine Environments Great Basin White Mountains elevation gradient climatic niche mean GLORIA alpine ecology community assembly
ISSN:	0002-9122, 1537-2197, 1537-2197
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Shrnutí:	Premise Examining community turnover across climate gradients at multiple scales is vital to understanding biogeographic response to climate change. This approach is especially important for alpine plants in which the relative roles of topographic complexity and nonclimatic or stochastic factors vary across spatial scales. Methods We examined the structure of alpine plant communities across elevation gradients in the White Mountains, California. Using community climatic niche means (CCNMs) and measures of community dissimilarity, we explored the relation between community composition and elevation gradients at three scales: the mountain range, individual peaks, and within elevation contours. Results At the mountain range scale, community turnover and CCNMs showed strongly significant relations with elevation, with an increase in the abundance of cooler and wetter‐adapted species at higher elevations. At the scale of single peaks, we found weak and inconsistent relations between CCNMs and elevation, but variation in community composition explained by elevation increased. Within the elevation contours, the range of CCNMs was weakly positively correlated with turnover in species identity, likely driven by microclimate and other site‐specific factors. Conclusions Our results suggest that there is strong environmental sorting of alpine plant communities at broad scales, but microclimatic and site‐specific, nonclimatic factors together shape community turnover at finer scales. In the context of climate change, our results imply that community–climate relations are scale‐dependent, and predictions of local alpine plant range shifts are limited by a lack of topoclimatic and habitat information.
Bibliografie:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 14 content type line 23
ISSN:	0002-9122 1537-2197 1537-2197
DOI:	10.1002/ajb2.1376