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Fish community structure in mesotrophic and eutrophic lakes of southern Finland: the relative abundances of percids and cyprinids along a trophic gradient

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In 36 south Finnish lakes, the number of species, as well as the cyprinids:percids ratio, was dependent, not only on total phosphorus (TP), but also on lake size. Total fish biomass and cyprinid biomass increased along the TP gradient, whereas the dependence of percid biomass was less evident. Perch Perca fluviatilis and roach Rutilus rutilus strongly dominated mesotrophic lakes; in eutrophic lakes the proportion of other cyprinids and percids, such as white bream Blicca bjoerkna, bream Abramis brama, pikeperch Stizostedion lucioperca and ruffe Gymnocephalus cernuus, increased. Perch biomass was weakly related to abiotic factors but depended on roach biomass. Lake size and fish species composition are essential factors affecting fish community changes in relation to TP, and may be important as well in regulating the responses of a fish community to biomanipulation.
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Document Type: Research Article

Affiliations: 1: Finnish Game and Fisheries Research Institute, P. O. Box 6, FIN-00721 Helsinki, Finland and University of Helsinki, Department of Limnology and Environment Protection, P.O. Box 27, FIN-00014 Helsinki, Finland 2: Finnish Game and Fisheries Research Institute, Evo Fisheries Research Station, FIN-16970 Evo, Finland 3: Finnish Game and Fisheries Research Institute, Turku Fisheries Research Station, FIN-20520 Turku, Finland 4: University of Helsinki, Lammi Biological Station, FIN-16900 Lammi, Finland 5: University of Jyväskylä, Department of Biological and Environmental Sciences, FIN-40351 Jyväskylä, Finland

Publication date: 2002-03-01

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