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Component community dynamics of larval trematodes in the freshwater snail Semisulcospira nakasekoae in the Uji River, central Japan

Published online by Cambridge University Press:  12 April 2024

M. Urabe  and
M Hinoue
M. Urabe*
Affiliation:
Department of Natural Science, Fukuoka University of Education, Akamabunkyo-machi 1-1, Munakata City, Fukuoka, 811-4192, Japan.
M Hinoue
Affiliation:
Laboratory of Animal Ecology, Faculty of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan.
*
* Fax: +81 940 35 1716E-mail: m-urabe@fukuoka-edu.ac.jp.
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Abstract

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The component community of larval trematodes in the freshwater snail Semisulcospira nakasekoae (Caenogastropoda: Sorbeoconcha: Pleuroceridae) was surveyed over 13 months from April 1996 to April 1997 inclusive. Temporal and spatial fluctuation of trematode prevalence, the frequency of multiple infections, and the duration of cercarial shedding were examined as factors that might affect trematode community structure. The spatial prevalence of some species varied significantly, but the dynamics were too small to allow an explanation of the overall pattern. The prevalence of sanguinicolids fluctuated temporally, despite a stable size distribution in the host populations (> 6.0 mm shell width), suggesting the life-cycle phenology of this species. Some pairs of species had statistically positive associations, but no pairs had negative associations. This shows the importance of positive association possibly as a result of suppression of the host defensive response on trematode community structures in molluscan hosts. The length of the patent period, which is part of the persistent period, varied among trematode species, suggesting it to be one of the factors determining prevalence in the host population.

Type
Research Article
Information
Journal of Helminthology , Volume 78 , Issue 4 , December 2004 , pp. 361 - 370
Copyright
Copyright © Cambridge University Press 2004

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