气候变化领域集成服务门户(CCPortal): Warming reverses top-down effects of predators on belowground ecosystem function in Arctic tundra

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DOI	10.1073/pnas.1808754115
	Warming reverses top-down effects of predators on belowground ecosystem function in Arctic tundra
	Koltz A.M.; Classen A.T.; Wright J.P.
发表日期	2018
ISSN	0027-8424
起始页码	E7541
结束页码	E7549
卷号	115 期号:32
英文摘要	Predators can disproportionately impact the structure and function of ecosystems relative to their biomass. These effects may be exacerbated under warming in ecosystems like the Arctic, where the number and diversity of predators are low and small shifts in community interactions can alter carbon cycle feedbacks. Here, we show that warming alters the effects of wolf spiders, a dominant tundra predator, on belowground litter decomposition. Specifically, while high densities of wolf spiders result in faster litter decomposition under ambient temperatures, they result, instead, in slower decomposition under warming. Higher spider densities are also associated with elevated levels of available soil nitrogen, potentially benefiting plant production. Changes in decomposition rates under increased wolf spider densities are accompanied by trends toward fewer fungivorous Collembola under ambient temperatures and more Collembola under warming, suggesting that Collembola mediate the indirect effects of wolf spiders on decomposition. The unexpected reversal of wolf spider effects on Collembola and decomposition suggest that in some cases, warming does not simply alter the strength of top-down effects but, instead, induces a different trophic cascade altogether. Our results indicate that climate change-induced effects on predators can cascade through other trophic levels, alter critical ecosystem functions, and potentially lead to climate feedbacks with important global implications. Moreover, given the expected increase in wolf spider densities with climate change, our findings suggest that the observed cascading effects of this common predator on detrital processes could potentially buffer concurrent changes in decomposition rates.
英文关键词	aboveground–belowground; Arctic; decomposition; predator; trophic interactions
语种	英语
scopus关键词	nitrogen; animal experiment; arctic tundra; Article; climate change; Collembola; controlled study; ecosystem; environmental temperature; litter decomposition; nonhuman; plant litter; population density; predator; priority journal; soil; warming; wolf spider; animal; Arctic; biomass; carbon cycle; chemistry; food chain; fungus; greenhouse effect; insect; microbiology; physiology; spider; tundra; Animals; Arctic Regions; Biomass; Carbon Cycle; Food Chain; Fungi; Global Warming; Insecta; Nitrogen; Soil; Soil Microbiology; Spiders; Tundra
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/160484
作者单位	Koltz, A.M., Department of Biology, Washington University in St. Louis, St. Louis, MO 63130, United States, Department of Biology, Duke University, Durham, NC 27708, United States; Classen, A.T., Rubenstein School of Environment and Natural Resources, University of Vermont, Burlington, VT 05405, United States, Gund Institute for Environment, University of Vermont, Burlington, VT 05405, United States; Wright, J.P., Department of Biology, Duke University, Durham, NC 27708, United States
推荐引用方式 GB/T 7714	Koltz A.M.,Classen A.T.,Wright J.P.. Warming reverses top-down effects of predators on belowground ecosystem function in Arctic tundra[J],2018,115(32).
APA	Koltz A.M.,Classen A.T.,&Wright J.P..(2018).Warming reverses top-down effects of predators on belowground ecosystem function in Arctic tundra.Proceedings of the National Academy of Sciences of the United States of America,115(32).
MLA	Koltz A.M.,et al."Warming reverses top-down effects of predators on belowground ecosystem function in Arctic tundra".Proceedings of the National Academy of Sciences of the United States of America 115.32(2018).