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Impacts of climate warming on lake fish community structure and potential effects on ecosystem function

Jeppesen, E. and Meerhoff, M. and Holmgren, K. and González-Bergonzoni, I. and Mello Teixeira-de, F. and Declerck, S.A.J. and Meester De, L. and Søndergaard, M. and Lauridsen, T. and Bjerring, R. and Conde-Porcuna, J-M. and Mazzeo, N. and Iglesias, C. and Reizenstein, M. and Malmquist, H.J. and Liu, Z. and Balayla, D. and Lazzaro, X. (2010) Impacts of climate warming on lake fish community structure and potential effects on ecosystem function. Hydrobiologia, 646, 73-90. ISSN 0018-8158.

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Fish play a key role in the trophic dynamics of lakes, not least in shallow systems. With climate warming, complex changes in fish community structure may be expected owing to the direct and indirect effects of temperature, and indirect effects of eutrophication, water-level changes and salinisation on fish metabolism, biotic interactions and geographical distribution. We review published and new data supporting the hypotheses that, with a warming climate, there will be changes in: fish community structure (e.g. higher or lower richness depending on local conditions); life history traits (e.g. smaller body size, shorter life span, earlier and less synchronised reproduction); feeding mode (i.e. increased omnivory and herbivory); behaviour (i.e. stronger association with littoral areas and a greater proportion of benthivores); and winter survival. All these changes imply higher predation on zooplankton and macroinvertebrates with increasing temperatures, suggesting that the changes in the fish communities partly resemble, and may intensify, the effects triggered by eutrophication. Modulating factors identified in cold and temperate systems, such as the presence of submerged plants and winter ice cover, seem to be weaker or non-existent in warm(ing) lakes. Consequently, in the future lower nutrient thresholds may be needed to obtain clear-water conditions and good ecological status in the future in currently cold or temperate lakes. Although examples are still scarce and more research is needed, we foresee biomanipulation to be a less successful restoration tool in warm(ing) lakes without a strong reduction of the nutrient load.

Item Type:Article
Institutes:Nederlands Instituut voor Ecologie (NIOO)
ID Code:9075
Deposited On:26 Jan 2011 01:00
Last Modified:24 Apr 2012 16:41

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