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Burrowing behaviour affects Paraergasilus rylovi abundance in Anodonta piscinalis

Published online by Cambridge University Press:  15 August 2006

J. TASKINEN  and
M. SAARINEN
J. TASKINEN
Affiliation:
Karelian Institute, Department of Ecology, University of Joensuu, P.O. Box 111, FI-80101 Joensuu, Finland
M. SAARINEN
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä, P.O. Box 35, FI-40014 University of Jyväskylä, Finland
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Abstract

Burrowing depth may affect predation rate, feeding ability and reproduction in bivalve clams. We studied the effect of burrowing depth on the abundance of the ergasilid Paraergasilus rylovi in the freshwater bivalve clam Anodonta piscinalis. We transplanted uninfected clams to a lake where they were allowed to choose their preferred burrowing depth, and were exposed naturally to copepodids of the parasite. There was a significant positive correlation between proportionate burrowing depth (PBD) and the abundance of P. rylovi at the end of the 17-day experiment, the deeper-burrowed clams harbouring more P. rylovi. Original PBD (0%, 50%, 100%) did not influence the final PBD or parasite abundance. Clam length affected PBD, smaller clams burrowing deeper, but it did not affect parasite abundance. Infected experimental clams and naturally-burrowed uninfected clams, both originating from the same lake, did not differ in their mean PBD. This indicated that burrowing of the experimental clams affected parasitism rather than the parasites altering burrowing of the clams. In line with the experimental result, we observed a significant positive correlation between PBD and the abundance of P. rylovi also among clams collected from 2 natural A. piscinalis populations.

Keywords

BivalviaburrowingbehaviourCopepodaErgasilidaeexposureparasitismsusceptibilitytransmissionUnionidae
Type
Research Article
Information
Parasitology , Volume 133 , Issue 5 , November 2006 , pp. 623 - 629
Copyright
2006 Cambridge University Press

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