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Microhabitat distribution and coexistence of Dactylogyrus species (Monogenea) on the gills of roach

Published online by Cambridge University Press:  06 April 2009

M. Koskivaara ,
E. T. Valtonen  and
K.-M. Vuori
M. Koskivaara
Affiliation:
Department of Biology, University of Jyvdskyld, 40100 Jyvasky la, Finland
E. T. Valtonen
Affiliation:
Department of Biology, University of Jyvdskyld, 40100 Jyvasky la, Finland
K.-M. Vuori
Affiliation:
Department of Biology, University of Jyvdskyld, 40100 Jyvasky la, Finland
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Summary

The Dactylogyrus fauna was studied from the gills of 293 roach between February 1988 and April 1989. Roach were caught from three interconnected lakes in Central Finland. Nine Dactylogyrus species were found. Of these the seven most abundant were used for studying the abundance of species on different gill-arches, niche breadth and niche overlap between the species. It was found that all species had a species-specific preference for certain gill-arches. The total abundances of all the species went through distinct seasonal changes, peaking during the spring and early summer. Some seasonal variation was also exhibited in gill-arch preferences. Niche breadth and species overlap were mostly higher during the period of peak occurrence of the various species, but in the case of some species they appeared to be unrelated to abundance, indicating possible niche restriction by other species. Most significant was the restriction of D. micracanthus to the fourth gill-arch during the period of peak occurrence of D. similis. Experimental work is needed to verify the reasons for variations in the microhabitat distribution of certain Dactylogyrus species.

Keywords

Dactylogyrus spp.roachgill-archesniche breadthspecies overlapinfracommunity
Type
Research Article
Information
Parasitology , Volume 104 , Issue 2 , April 1992 , pp. 273 - 281
Copyright
Copyright © Cambridge University Press 1992

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