DOI: 10.1111/ele.12635
Scopus记录号: 2-s2.0-84978076988
论文题名: Trophic cascades in the bryosphere: the impact of global change factors on top-down control of cyanobacterial N2 -fixation
作者: Kardol P. ; Spitzer C.M. ; Gundale M.J. ; Nilsson M.-C. ; Wardle D.A.
刊名: Ecology letters
ISSN: 14610248
EISSN: 1461-0248
出版年: 2016
卷: 19, 期: 8 起始页码: 967
结束页码: 976
语种: 英语
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
Scopus关键词: animal
; cyanobacterium
; food chain
; microbiology
; moss
; nitrogen fixation
; physiology
; Animals
; Bryophyta
; Cyanobacteria
; Food Chain
; Nitrogen Fixation
; Bryophyta
; Cyanobacteria
; Pleurozium schreberi
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. Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/107744
Appears in Collections: 气候减缓与适应
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作者单位: Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, 901 83, Umeå, Sweden
Recommended Citation:
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]. Ecology letters,2016-01-01,19(8)