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Infection ecology of Philometra ovata (Nematoda: Philometridae) in a wild European minnow (Phoxinus phoxinus) population in Finland

Published online by Cambridge University Press:  05 February 2015

YI-TE LAI ,
JOUNI TASKINEN ,
JUKKA KEKÄLÄINEN  and
RAINE KORTET
YI-TE LAI*
Affiliation:
Department of Biology, University of Eastern Finland, P.O. Box 111, FIN-80101, Joensuu, Finland
JOUNI TASKINEN
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland
JUKKA KEKÄLÄINEN
Affiliation:
Department of Biology, University of Eastern Finland, P.O. Box 111, FIN-80101, Joensuu, Finland Centre for Evolutionary Biology, The University of Western Australia, Crawley, Australia
RAINE KORTET
Affiliation:
Department of Biology, University of Eastern Finland, P.O. Box 111, FIN-80101, Joensuu, Finland
*
*Corresponding author. Department of Biology, University of Eastern Finland, P.O. Box 111, FIN-80101, Joensuu, Finland. E-mail: [email protected]
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Summary

Seasonal life cycle of body cavity dwelling (BCD) Philometra ovata (Nematoda: Philometridae) has been reported in southern and central European countries, but its swim bladder dwelling (SBD) stage and northern populations have remained unstudied. In this study, we investigated the seasonal life cycle and infection ecology of P. ovata in both swim bladder and body cavity in the European minnow (Phoxinus phoxinus) in Finland. The larval P. ovata infected the swim bladder of minnows mainly in August. Female SBD P. ovata emigrated to body cavity mostly in September, grew to their full size by the end of the next June, and evacuated from minnows in July. In addition, female SBD P. ovata retarding their development and staying in swim bladder were found commonly in minnows, thus the mean monthly prevalence (6·7 ± 3·9%) and mean intensity (1·4 ± 0·8) of BCD P. ovata was lower than that of SBD P. ovata (37·8 ± 15·1% and 2·0 ± 1·5, respectively). Finally, despite the large size of BCD individuals, infection of P. ovata did not impair body condition and relative gonad size of minnows, but increased the mortality and caused physical damages in their hosts during the evacuation period.

Keywords

Philometra ovataEuropean minnowPhoxinus phoxinusbody cavityswim bladderparasitic infectionprevalenceintensity
Type
Research Article
Information
Parasitology , Volume 142 , Issue 7 , June 2015 , pp. 926 - 937
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Copyright
Copyright © Cambridge University Press 2015 

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