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Erik Jeppesen

Impacts of climate warming on the long-term dynamics of key fish species in 24 European lakes

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  • E. Jeppesen
  • T. Mehner, Department of Biology and Ecology of Fishes
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  • I.J. Winfield, Lancaster Environment Centre
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  • K. Kangur, Estonian University of Life Sciences
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  • J. Sarvala, University of Turku
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  • D. Gerdeaux, INRA, Stn Hydrobiol Lacustre
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  • M. Rask, Finnish Game and Fisheries Research Institute, Evo Fisheries Research Station, Denmark
  • H.J. Malmquist, Natural History Museum of Kópavogur
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  • K. Holmgren, Swedish University of Agricultural Sciences
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  • P. Volta, Consiglio Nazionale delle Ricerche, Institute of Ecosystems Study
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  • S. Romo, University of Valencia
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  • R. Eckmann, University of Konstanz
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  • A. Sandström, Swedish University of Agricultural Sciences
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  • S. Blanco, University of Valencia
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  • A. Kangur, Estonian University of Life Sciences
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  • H. Ragnarsson Stabo, Swedish University of Agricultural Sciences
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  • M. Tarvainen, Pyhäjärvi Institute
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  • A.-M. Ventelä, Pyhäjärvi Institute
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  • M. Søndergaard
  • T.L. Lauridsen, China
  • M. Meerhoff, Uruguay
Fish play a key role in the trophic dynamics of lakes. With climate warming, complex changes in fish assemblage structure may be expected owing to direct effects of temperature and indirect effects operating through eutrophication, water level changes, stratification and salinisation. We reviewed published and new long-term (10-100 years) fish data series from 24 European lakes (area: 0. 04-5,648 km ; mean depth: 1-177 m; a north-south gradient from Sweden to Spain). Along with an annual temperature increase of about 0. 15-0. 3°C per decade profound changes have occurred in either fish assemblage composition, body size and/or age structure during recent decades and a shift towards higher dominance of eurythermal species. These shifts have occurred despite a reduction in nutrient loading in many of the lakes that should have benefited the larger-sized individuals and the fish species typically inhabiting cold-water, low-nutrient lakes. The cold-stenothermic Arctic charr has been particularly affected and its abundance has decreased in the majority of the lakes where its presence was recorded. The harvest of cool-stenothermal brown trout has decreased substantially in two southern lakes. Vendace, whitefish and smelt show a different response depending on lake depth and latitude. Perch has apparently been stimulated in the north, with stronger year classes in warm years, but its abundance has declined in the southern Lake Maggiore, Italy. Where introduced, roach seems to take advantage of the higher temperature after years of low population densities. Eurythermal species such as common bream, pike-perch and/or shad are apparently on the increase in several of the lakes. The response of fish to the warming has been surprisingly strong and fast in recent decades, making them ideal sentinels for detecting and documenting climate-induced modifications of freshwater ecosystems.
Original languageEnglish
JournalHydrobiologia
Volume694
Issue1
Pages (from-to)1-39
Number of pages39
ISSN0018-8158
DOIs
Publication statusPublished - 1 Sep 2012

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