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Spatial and temporal structure of the trematode component community in Valvata macrostoma (Gastropoda, Prosobranchia)

Published online by Cambridge University Press:  10 November 2008

A. FALTÝNKOVÁ*
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä, PO Box 35 (YA), FI-40014 Jyväskylä, Finland Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic
E. T. VALTONEN
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä, PO Box 35 (YA), FI-40014 Jyväskylä, Finland
A. KARVONEN
Affiliation:
Department of Biological and Environmental Science, University of Jyväskylä, PO Box 35 (YA), FI-40014 Jyväskylä, Finland
*
*Corresponding author: Institute of Parasitology, Biology Centre of the Czech Academy of Sciences, Branišovská 31, 370 05 České Budějovice, Czech Republic. Tel: +420 38 7775486. Fax: +420 385300388. E-mail: faltyn@paru.cas.cz

Summary

We conducted the first comprehensive study on the spatiotemporal structure of trematode communities in the large-mouthed valve snail, Valvata macrostoma. A total of 1103 snails were examined monthly between May and October 2007 from Lake Konnevesi, Central Finland, from a shallow (1–2 m deep) and an offshore site (5–6 m deep), located ca. 50–70 m apart. Snails were infected by 10 trematode species. The species composition and prevalence were strikingly different between the sites with high species diversity in the shallow site (all 10 species; total prevalence of sporocysts/rediae 12·1%, metacercariae 55·4%) compared to the deeper site (3 species; prevalence 15·0% and 1·9%, respectively). This difference persisted throughout our study and is probably related to the spatial distribution of bird definitive hosts, whereas the seasonal parasite dynamics are likely to be affected by changes in the age-structure of the snail population. The probability of sporocyst infections increased with snail size, but no such trend was observed in redial or metacercarial infections which decreased with host size. Our results show that generally well-described spatiotemporal differences in trematode infection of molluscs can emerge in very narrow spatial and temporal scales, which emphasizes the importance of these factors in community studies.

Type
Research Article
Copyright
Copyright © 2008 Cambridge University Press

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