气候变化领域集成服务门户(CCPortal): How variation between individuals affects species coexistence

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DOI	10.1111/ele.12618
	How variation between individuals affects species coexistence
	Hart S.P.; Schreiber S.J.; Levine J.M.
发表日期	2016
ISSN	1461-023X
EISSN	1461-0248
卷号	19 期号:8
英文摘要	Although the effects of variation between individuals within species are traditionally ignored in studies of species coexistence, the magnitude of intraspecific variation in nature is forcing ecologists to reconsider. Compelling intuitive arguments suggest that individual variation may provide a previously unrecognised route to diversity maintenance by blurring species-level competitive differences or substituting for species-level niche differences. These arguments, which are motivating a large body of empirical work, have rarely been evaluated with quantitative theory. Here we incorporate intraspecific variation into a common model of competition and identify three pathways by which this variation affects coexistence: (1) changes in competitive dynamics because of nonlinear averaging, (2) changes in species' mean interaction strengths because of variation in underlying traits (also via nonlinear averaging) and (3) effects on stochastic demography. As a consequence of the first two mechanisms, we find that intraspecific variation in competitive ability increases the dominance of superior competitors, and intraspecific niche variation reduces species-level niche differentiation, both of which make coexistence more difficult. In addition, individual variation can exacerbate the effects of demographic stochasticity, and this further destabilises coexistence. Our work provides a theoretical foundation for emerging empirical interests in the effects of intraspecific variation on species diversity. © 2016 John Wiley & Sons Ltd/CNRS.
英文关键词	community assembly; competition; demographic heterogeneity; demographic stochasticity; functional traits; genetic diversity; individual variation; intraspecific variation; nonlinear averaging; species coexistence
学科领域	annual variation; coexistence; competition (ecology); competitive ability; demography; differentiation; ecological modeling; genetic variation; heterogeneity; intraspecific variation; species diversity; stochasticity; adaptation; animal; biological model; competitive behavior; ecosystem; population dynamics; species difference; Adaptation, Physiological; Animals; Competitive Behavior; Ecosystem; Models, Biological; Population Dynamics; Species Specificity
语种	英语
scopus关键词	annual variation; coexistence; competition (ecology); competitive ability; demography; differentiation; ecological modeling; genetic variation; heterogeneity; intraspecific variation; species diversity; stochasticity; adaptation; animal; biological model; competitive behavior; ecosystem; population dynamics; species difference; Adaptation, Physiological; Animals; Competitive Behavior; Ecosystem; Models, Biological; Population Dynamics; Species Specificity
来源期刊	Ecology letters
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/118521
作者单位	Institute of Integrative Biology, ETH Zürich (Swiss Federal Institute of Technology), Universitätrasse 16, 8092, Zürich, Switzerland; Department of Evolution & Ecology and the Center for Population Biology, One Shields Avenue, University of California, Davis, CA, 95616, USA
推荐引用方式 GB/T 7714	Hart S.P.,Schreiber S.J.,Levine J.M.. How variation between individuals affects species coexistence[J],2016,19(8).
APA	Hart S.P.,Schreiber S.J.,&Levine J.M..(2016).How variation between individuals affects species coexistence.Ecology letters,19(8).
MLA	Hart S.P.,et al."How variation between individuals affects species coexistence".Ecology letters 19.8(2016).