气候变化领域集成服务门户(CCPortal): Trophic cascades in the bryosphere: the impact of global change factors on top-down control of cyanobacterial N2 -fixation

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DOI	10.1111/ele.12635
	Trophic cascades in the bryosphere: the impact of global change factors on top-down control of cyanobacterial N2 -fixation
	Kardol P.; Spitzer C.M.; Gundale M.J.; Nilsson M.-C.; Wardle D.A.
发表日期	2016
ISSN	1461-023X
EISSN	1461-0248
卷号	19 期号:8
英文摘要	Trophic cascades in which predators regulate densities of organisms at lower trophic levels are important drivers of population dynamics, but effects of trophic cascades on ecosystem-level fluxes and processes, and the conditions under which top-down control is important, remain unresolved. We manipulated the structure of a food web in boreal feather mosses and found that moss-inhabiting microfauna exerted top-down control of N2 -fixation by moss-associated cyanobacteria. However, the presence of higher trophic levels alleviated this top-down control, likely through feeding on bacterivorous microfauna. These effects of food-web structure on cyanobacterial N2 -fixation were dependent on global change factors and strongly suppressed under N fertilisation. Our findings illustrate how food web interactions and trophic cascades can regulate N cycling in boreal ecosystems, where carbon uptake is generally strongly N-limited, and shifting trophic control of N cycling under global change is therefore likely to impact ecosystem functioning. © 2016 John Wiley & Sons Ltd/CNRS.
英文关键词	Boreal forest; bottom-up control; feather moss; food webs; nitrogen cycling; nitrogen deposition; Pleurozium schreberi; precipitation; top-down control; trophic interactions
学科领域	animal; cyanobacterium; food chain; microbiology; moss; nitrogen fixation; physiology; Animals; Bryophyta; Cyanobacteria; Food Chain; Nitrogen Fixation; Bryophyta; Cyanobacteria; Pleurozium schreberi
语种	英语
scopus关键词	animal; cyanobacterium; food chain; microbiology; moss; nitrogen fixation; physiology; Animals; Bryophyta; Cyanobacteria; Food Chain; Nitrogen Fixation; Bryophyta; Cyanobacteria; Pleurozium schreberi
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/118512
作者单位	Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83, Umeå, Sweden
推荐引用方式 GB/T 7714	Kardol P.,Spitzer C.M.,Gundale M.J.,et al. Trophic cascades in the bryosphere: the impact of global change factors on top-down control of cyanobacterial N2 -fixation[J],2016,19(8).
APA	Kardol P.,Spitzer C.M.,Gundale M.J.,Nilsson M.-C.,&Wardle D.A..(2016).Trophic cascades in the bryosphere: the impact of global change factors on top-down control of cyanobacterial N2 -fixation.Ecology letters,19(8).
MLA	Kardol P.,et al."Trophic cascades in the bryosphere: the impact of global change factors on top-down control of cyanobacterial N2 -fixation".Ecology letters 19.8(2016).