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Parasite communities as indicators of recovery from pollution: parasites of roach (Rutilus rutilus) and perch (Perca fluviatilis) in Central Finland

Published online by Cambridge University Press:  10 November 2003

E. T. VALTONEN ,
J. C. HOLMES ,
J. ARONEN  and
I. RAUTALAHTI
E. T. VALTONEN
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä SF 40100 Jyväskylä, Finland
J. C. HOLMES
Affiliation:
Department of Biological Sciences, University of Alberta, Edmonton, Alberta, Canada T6G 2F9
J. ARONEN
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä SF 40100 Jyväskylä, Finland
I. RAUTALAHTI
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä SF 40100 Jyväskylä, Finland
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Abstract

We compared parasite communities in fish taken from a polluted lake (L. Vatia) and two control lakes before (1986) and after (1995) nine years of markedly reduced chemical and nutrient loading from a pulpmill in central Finland. Discriminant analyses of the 1995 data, using a function based on the 1986 data, showed that the parasite communities in the fish from the two control lakes had changed relatively little, whereas those from L. Vatia had converged on those from the mesotrophic control lake, indicating substantial recovery from the effects of pollution. Only a few species of parasites provided evidence for recovery. These were anodontid glochidia, which had increased markedly in perch, Rhipidocotyle fennica in roach and R. campanula in both fish species. This suggests that the recovery of the polluted lake involved increased populations of anadontid clams in shallow waters. On the other side decrease of Dermocystidium percae on perch fins and Ichthyophthirius multifiliis on roach indicate increased immune responses in the fish, reflecting better water quality. Other parts of the system have apparently not yet recovered.

Keywords

Discriminant analysispulp mill effluenteutrophicationinfracommunityfreshwater fishrecovery
Type
Research Article
Information
Parasitology , Volume 126 , Issue 7 , March 2003 , pp. S43 - S52
Copyright
© 2003 Cambridge University Press

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