DOI: 10.1111/ele.12498
Scopus记录号: 2-s2.0-84943660939
论文题名: HSS revisited: Multi-channel processes mediate trophic control across a productivity gradient
作者: Ward C.L. ; Mccann K.S. ; Rooney N.
刊名: Ecology Letters
ISSN: 1461023X
EISSN: 1461-0248
出版年: 2015
卷: 18, 期: 11 起始页码: 1190
结束页码: 1197
语种: 英语
英文关键词: Apparent trophic cascade
; Detritus
; Food webs
; Productivity
; Trophic control
Scopus关键词: apparent competition
; detritus
; diet
; food web
; grazing
; top-down control
; trophic cascade
; trophic control
英文摘要: Classical food web theory holds that energy channels are regulated by top-down control with increasing productivity, arising from within-channel processes. However, these hypotheses do not consider the existence of parallel energy channels linked by shared resource pools and which can fuel generalist predators, imposing trophic control arising from multi-channel processes. Using 23 large marine food webs, we show that food web responses to increasing productivity are consistent with the apparent trophic cascade hypothesis (ATCH) - with rising productivity predators derive an increasing fraction of their diet from increasingly productive bottom-up controlled detritus channels, thereby subsidising predator biomass, and in turn strengthening top-down control in parallel grazing channels. These results testify to a fundamental role of detritus channels specifically and multi-channel processes in general in mediating food web response to productivity and demonstrate that the ATCH provides an alternative explanation for classical predictions of top-down control. © 2015 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/107841
Appears in Collections: 气候减缓与适应
There are no files associated with this item.
作者单位: Department of Integrative Biology, University of Guelph, Guelph, ON, Canada; National Center for Ecological Analysis and Synthesis, University of California, Santa Barbara, 735 State Street, Suite 300, Santa Barbara, CA, United States; School of Environmental Sciences, University of Guelph, Guelph, ON, Canada; Saugeen Ojibway Nation, R. R. #5, Wiarton, ON, Canada
Recommended Citation:
Ward C.L.,Mccann K.S.,Rooney N.. HSS revisited: Multi-channel processes mediate trophic control across a productivity gradient[J]. Ecology Letters,2015-01-01,18(11)