globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13574
论文题名:
Experimental whole-stream warming alters community size structure
作者: Nelson D.; Benstead J.P.; Huryn A.D.; Cross W.F.; Hood J.M.; Johnson P.W.; Junker J.R.; Gíslason G.M.; Ólafsson J.S.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2017
卷: 23, 期:7
起始页码: 2618
结束页码: 2628
语种: 英语
英文关键词: body size ; community structure ; energy demand ; metabolic theory ; stream warming ; thermal preference
Scopus关键词: Chironomidae ; Diptera ; Gastropoda ; Invertebrata ; Oligochaeta (Metazoa)
英文摘要: How ecological communities respond to predicted increases in temperature will determine the extent to which Earth's biodiversity and ecosystem functioning can be maintained into a warmer future. Warming is predicted to alter the structure of natural communities, but robust tests of such predictions require appropriate large-scale manipulations of intact, natural habitat that is open to dispersal processes via exchange with regional species pools. Here, we report results of a two-year whole-stream warming experiment that shifted invertebrate assemblage structure via unanticipated mechanisms, while still conforming to community-level metabolic theory. While warming by 3.8 °C decreased invertebrate abundance in the experimental stream by 60% relative to a reference stream, total invertebrate biomass was unchanged. Associated shifts in invertebrate assemblage structure were driven by the arrival of new taxa and a higher proportion of large, warm-adapted species (i.e., snails and predatory dipterans) relative to small-bodied, cold-adapted taxa (e.g., chironomids and oligochaetes). Experimental warming consequently shifted assemblage size spectra in ways that were unexpected, but consistent with thermal optima of taxa in the regional species pool. Higher temperatures increased community-level energy demand, which was presumably satisfied by higher primary production after warming. Our experiment demonstrates how warming reassembles communities within the constraints of energy supply via regional exchange of species that differ in thermal physiological traits. Similar responses will likely mediate impacts of anthropogenic warming on biodiversity and ecosystem function across all ecological communities. © 2016 John Wiley & Sons Ltd
资助项目: This work was supported by the National Science Foundation (DEB-0949774 and DEB-0949726). JMH was supported by the Icelandic Research Fund (i. Rannsóknasjóður) 141840-051 during manuscript preparation. We thank Lauren Davis, David Hernandez, Amanda Keasberry, Elena Nava, Camille Perrett, and Jackie Pitts for help in the laboratory, and Friðþjófur Árnason, Liliana García, Ragnhildur Magnúsdóttir, Ryan McClure, Vija Pelekis, Adam Toomey, Chau Tran, Brooke Weigel, and Tanner Williamson for assistance in the field. We are grateful to Sigurður Guðjónsson, Guðni Guðbergsson, and the rest of the staff at the Veiðimálastofnun for providing laboratory space and logistical support. Many thanks to Sveinbjörn Steinþórsson at the University of Iceland and the Hveragerði rescue squad for super-jeep transport to our field sites during the winter. James H. Brown, Robert O. Hall, Eoin J. O'Gorman, and Gabriel Yvon-Durocher provided insightful comments on earlier versions of this manuscript. We also thank Bob Clarke for his suggestions regarding the multivariate analysis of our data.
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/60919
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Biological Sciences, University of Alabama, Tuscaloosa, AL, United States; Department of Ecology, Montana State University, Bozeman, MT, United States; Department of Evolution, Ecology and Organismal Biology, The Aquatic Ecology Laboratory, The Ohio State University, Columbus, OH, United States; Department of Civil, Construction and Environmental Engineering, University of Alabama, Tuscaloosa, AL, United States; Institute of Life and Environmental Sciences, University of Iceland, Reykjavík, Iceland; Institute of Freshwater Fisheries, Reykjavík, Iceland

Recommended Citation:
Nelson D.,Benstead J.P.,Huryn A.D.,et al. Experimental whole-stream warming alters community size structure[J]. Global Change Biology,2017-01-01,23(7)
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