globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.14133
Scopus记录号: 2-s2.0-85046745128
论文题名:
Detrimental effects of a novel flow regime on the functional trajectory of an aquatic invertebrate metacommunity
作者: Ruhi A.; Dong X.; McDaniel C.H.; Batzer D.P.; Sabo J.L.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2018
卷: 24, 期:8
起始页码: 3749
结束页码: 3765
语种: 英语
英文关键词: Biological traits ; hydrologic alteration ; invertebrates ; time-series methods
Scopus关键词: adaptation ; community response ; dam ; dispersal ; ecosystem function ; global change ; hydroelectric power ; hydrological regime ; invertebrate ; time series analysis ; water flow ; Chattahoochee River ; Georgia ; United States ; Invertebrata
英文摘要: Novel flow regimes resulting from dam operations and overallocation of freshwater resources are an emerging consequence of global change. Yet, anticipating how freshwater biodiversity will respond to surging flow regime alteration requires overcoming two challenges in environmental flow science: shifting from local to riverscape-level understanding of biodiversity dynamics, and from static to time-varying characterizations of the flow regime. Here, we used time-series methods (wavelets and multivariate autoregressive models) to quantify flow-regime alteration and to link time-varying flow regimes to the dynamics of multiple local communities potentially connected by dispersal (i.e., a metacommunity). We studied the Chattahoochee River below Buford dam (Georgia, U.S.A.), and asked how flow regime alteration by a large hydropower dam may control the long-term functional trajectory of the downstream invertebrate metacommunity. We found that seasonal variation in hydropeaking synchronized temporal fluctuations in trait abundance among the flow-altered sites. Three biological trait states describing adaptation to fast flows benefitted from flow management for hydropower, but did not compensate for declines in 16 “loser” traits. Accordingly, metacommunity-wide functional diversity responded negatively to hydropeaking intensity, and stochastic simulations showed that the risk of functional diversity collapse within the next 4 years would decrease by 17% if hydropeaking was ameliorated, or by 9% if it was applied every other season. Finally, an analysis of 97 reference and 23 dam-affected river sites across the U.S. Southeast suggested that flow variation at extraneous, human-relevant scales (12-hr, 24-hr, 1-week) is relatively common in rivers affected by hydropower dams. This study advances the notion that novel flow regimes are widespread, and simplify the functional structure of riverine communities by filtering out taxa with nonadaptive traits and by spatially synchronizing their dynamics. This is relevant in the light of ongoing and future hydrologic alteration due to climate non-stationarity and the new wave of dams planned globally. © 2018 John Wiley & Sons Ltd
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/110287
Appears in Collections:影响、适应和脆弱性
气候变化事实与影响

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作者单位: Department of Environmental Science, Policy, and Management, University of California, Berkeley, Berkeley, CA, United States; National Socio-Environmental Synthesis Center (SESYNC), University of Maryland, Annapolis, MD, United States; Nicholas School of the Environment, Duke University, Durham, NC, United States; Department of Environmental Science and Ecology, The College at Brockport, State University of New York, Brockport, NY, United States; Department of Entomology, University of Georgia, Athens, GA, United States; School of Life Sciences, Arizona State University, Tempe, AZ, United States

Recommended Citation:
Ruhi A.,Dong X.,McDaniel C.H.,et al. Detrimental effects of a novel flow regime on the functional trajectory of an aquatic invertebrate metacommunity[J]. Global Change Biology,2018-01-01,24(8)
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