气候变化领域集成服务门户(CCPortal): Climate variability and density-dependent population dynamics: Lessons from a simple High Arctic ecosystem

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DOI	10.1073/pnas.2106635118
	Climate variability and density-dependent population dynamics: Lessons from a simple High Arctic ecosystem
	Fauteux D.; Stien A.; Yoccoz N.G.; Fuglei E.; Ims R.A.
发表日期	2021
ISSN	0027-8424
卷号	118 期号:37
英文摘要	Ecologists are still puzzled by the diverse population dynamics of herbivorous small mammals that range from high-amplitude, multiannual cycles to stable dynamics. Theory predicts that this diversity results fromcombinations of climatic seasonality, weather stochasticity, and density-dependent food web interactions. The almost ubiquitous 3- to 5-y cycles in boreal and arctic climates may theoretically result from bottom-up (plant-herbivore) and top-down (predator-prey) interactions. Assessing, empirically, the roles of such interactions and how they are influenced by environmental stochasticity has been hampered by food web complexity. Here, we take advantage of a uniquely simple High Arctic food web, which allowed us to analyze the dynamics of a graminivorous vole population not subjected to top-down regulation. This population exhibited highamplitude, noncyclic fluctuations-partly driven by weather stochasticity. However, the predominant driver of the dynamics was overcompensatory density dependence in winter that caused the population to frequently crash. Model simulations showed that the seasonal pattern of density dependence would yield regular 2-y cycles in the absence of stochasticity. While such short cycles have not yet been observed in mammals, they are theoretically plausible if graminivorous vole populations are deterministically bottom-up regulated.When incorporating weather stochasticity in the model simulations, cyclicity became disrupted and the amplitude was increased-akin to the observed dynamics. Our findings contrast with the 3- to 5-y population cycles that are typical of graminivorous small mammals in more complex food webs, suggesting that top-down regulation is normally an important component of such dynamics. © 2021 National Academy of Sciences. All rights reserved.
英文关键词	Bottom-up regulation; Population fluctuations; Seasonality; Trophic interactions; Tundra ecosystem
语种	英语
scopus关键词	Arctic; article; climate change; down regulation; food web; nonhuman; population cycle; seasonal variation; simulation; small mammal; stochastic model; theoretical study; tundra; upregulation; weather; winter
来源期刊	Proceedings of the National Academy of Sciences of the United States of America
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/238646
作者单位	Canadian Museum of Nature, Centre for Arctic Knowledge and Exploration, Gatineau, QC J9J 3N7, Canada; Department of Arctic and Marine Biology, University of Tromsø-The Arctic University of Norway, Tromsø, N-9037, Norway; Norwegian Polar Institute, Tromsø, N-9296, Norway
推荐引用方式 GB/T 7714	Fauteux D.,Stien A.,Yoccoz N.G.,et al. Climate variability and density-dependent population dynamics: Lessons from a simple High Arctic ecosystem[J],2021,118(37).
APA	Fauteux D.,Stien A.,Yoccoz N.G.,Fuglei E.,&Ims R.A..(2021).Climate variability and density-dependent population dynamics: Lessons from a simple High Arctic ecosystem.Proceedings of the National Academy of Sciences of the United States of America,118(37).
MLA	Fauteux D.,et al."Climate variability and density-dependent population dynamics: Lessons from a simple High Arctic ecosystem".Proceedings of the National Academy of Sciences of the United States of America 118.37(2021).