气候变化领域集成服务门户(CCPortal): Pulsed seaweed subsidies drive sequential shifts in the effects of lizard predators on island food webs

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DOI	10.1111/ele.13377
	Pulsed seaweed subsidies drive sequential shifts in the effects of lizard predators on island food webs
	Piovia-Scott J.; Yang L.H.; Wright A.N.; Spiller D.A.; Schoener T.W.
发表日期	2019
ISSN	1461023X
卷号	22 期号:11
英文摘要	Most prominent theories of food web dynamics imply the simultaneous action of bottom–up and top–down forces. However, transient bottom-up effects resulting from resource pulses can lead to sequential shifts in the strength of top–down predator effects. We used a large-scale field experiment (32 small islands sampled over 5 years) to probe how the frequency and magnitude of pulsed seaweed inputs drives temporal variation in the top–down effects of lizard predators. Short-term weakening of lizard effects on spiders and plants (the latter via a trophic cascade) were associated with lizard diet shifts, and were more pronounced with larger seaweed inputs. Long-term strengthening of lizard effects was associated with lizard numerical responses and plant fertilisation. Increased pulse frequency reinforced the strengthening of lizard effects on spiders and plants. These results underscore the temporally variable nature of top–down effects and highlight the role of resource pulses in driving this variation. © 2019 John Wiley & Sons Ltd/CNRS
英文关键词	Allochthonous resource; Anolis; diet shift; flexible foraging; numerical response; resource pulse; resource subsidy; temporal variation; transient dynamics; trophic cascade
语种	英语
scopus关键词	Anolis; Araneae; Squamata; animal; food chain; island (geological); lizard; predation; seaweed; spider; Animals; Food Chain; Islands; Lizards; Predatory Behavior; Seaweed; Spiders
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/121021
作者单位	School of Biological Sciences, Washington State University, Vancouver, WA, United States; Department of Entomology and Nematology, University of California, Davis, CA, United States; Department of Biology, University of Hawaii, Manoa, HI, United States; Department of Evolution and Ecology, University of California, Davis, CA, United States
推荐引用方式 GB/T 7714	Piovia-Scott J.,Yang L.H.,Wright A.N.,et al. Pulsed seaweed subsidies drive sequential shifts in the effects of lizard predators on island food webs[J],2019,22(11).
APA	Piovia-Scott J.,Yang L.H.,Wright A.N.,Spiller D.A.,&Schoener T.W..(2019).Pulsed seaweed subsidies drive sequential shifts in the effects of lizard predators on island food webs.Ecology Letters,22(11).
MLA	Piovia-Scott J.,et al."Pulsed seaweed subsidies drive sequential shifts in the effects of lizard predators on island food webs".Ecology Letters 22.11(2019).