globalchange  > 影响、适应和脆弱性
DOI: 10.1111/gcb.13233
论文题名:
Temperature effects on fish production across a natural thermal gradient
作者: O'Gorman E.J.; Ólafsson Ó.P.; Demars B.O.L.; Friberg N.; Guðbergsson G.; Hannesdóttir E.R.; Jackson M.C.; Johansson L.S.; McLaughlin Ó.B.; Ólafsson J.S.; Woodward G.; Gíslason G.M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2016
卷: 22, 期:9
起始页码: 3206
结束页码: 3220
语种: 英语
英文关键词: Arctic ; ecosystem services ; freshwater ; Hengill ; mark-recapture ; natural experiment ; PIT tag ; Salmo trutta fario
Scopus关键词: biomass ; ecosystem function ; ecosystem service ; fish ; geographical distribution ; global warming ; mark-recapture method ; salmonid ; temperature effect ; temperature gradient ; Arctic ; Iceland ; Salmo trutta ; Salmo trutta fario ; Salmonidae
英文摘要: Global warming is widely predicted to reduce the biomass production of top predators, or even result in species loss. Several exceptions to this expectation have been identified, however, and it is vital that we understand the underlying mechanisms if we are to improve our ability to predict future trends. Here, we used a natural warming experiment in Iceland and quantitative theoretical predictions to investigate the success of brown trout as top predators across a stream temperature gradient (4–25 °C). Brown trout are at the northern limit of their geographic distribution in this system, with ambient stream temperatures below their optimum for maximal growth, and above it in the warmest streams. A five-month mark-recapture study revealed that population abundance, biomass, growth rate, and production of trout all increased with stream temperature. We identified two mechanisms that contributed to these responses: (1) trout became more selective in their diet as stream temperature increased, feeding higher in the food web and increasing in trophic position; and (2) trophic transfer through the food web was more efficient in the warmer streams. We found little evidence to support a third potential mechanism: that external subsidies would play a more important role in the diet of trout with increasing stream temperature. Resource availability was also amplified through the trophic levels with warming, as predicted by metabolic theory in nutrient-replete systems. These results highlight circumstances in which top predators can thrive in warmer environments and contribute to our knowledge of warming impacts on natural communities and ecosystem functioning. © 2016 The Authors. Global Change Biology Published by John Wiley & Sons Ltd.
资助项目: We thank Becca Kordas and three anonymous reviewers for valuable comments on the manuscript. The authors are supported by grants awarded by NERC (NE/L011840/1 and NE/I009280/2), the Royal Society (RG140601), the British Ecological Society (4009-4884), the Fisheries Society of the British Isles, the Grand Challenges in Ecosystems and the Environment initiative at Imperial College London, the Scottish Government Rural and Environment Science and Analytical Services (RESAS), the Salmonid Fisheries Management Fund in Reykjavik, and Assistantship and Research Funds from the University of Iceland (GMG2006, GMG2007).
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/61314
Appears in Collections:影响、适应和脆弱性

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作者单位: Department of Life Sciences, Imperial College London, Silwood Park Campus, Buckhurst Road, Ascot, Berkshire, United Kingdom; Institute of Life and Environmental Sciences, University of Iceland, Askja, Sturlugata 7, Reykjavík, Iceland; The James Hutton Institute, Aberdeen, United Kingdom; Norwegian Institute for Water Research (NIVA), Gaustadalléen 21, Oslo, Norway; Institute of Freshwater Fisheries, Keldnaholt, Reykjavík, Iceland; Centre for Invasion Biology, Department of Zoology and Entomology, University of Pretoria, Hatfield 0026, Gauteng, South Africa; Department of Bioscience, Aarhus University, Silkeborg, Denmark; Institut National de la Recherche Agronomique (INRA), UMR 1347 Agroécologie, 17 rue Sully - BP 86510, Dijon, France

Recommended Citation:
O'Gorman E.J.,Ólafsson Ó.P.,Demars B.O.L.,et al. Temperature effects on fish production across a natural thermal gradient[J]. Global Change Biology,2016-01-01,22(9)
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