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Thermal effects on the seasonal dynamics of Paradiplozoon homoion (Bychowsky & Nagibina, 1959) parasitizing roach, Rutilus rutilus (L.)

Published online by Cambridge University Press:  05 June 2009

Johan Höglund  and
Jan Thulin
Johan Höglund
Affiliation:
Department of Zoology, Uppsala University, Box 561, S–751 22 Uppsala, Sweden
Jan Thulin
Affiliation:
The National Swedish Environmental Protection Board, Marine Section, Box 584, S–740 71 Öregrund, Sweden
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Abstract

The prevalence and relative density of the monogenean Paradiplozoon homoion, were monitored over one year in populations of roach, Rutilus rutilus, captured in a thermally raised artificial lake located outside a nuclear power station and in a nearby reference locality. Recruitment of P. homoion started earlier in the warmer lake. A temporal shift of the life-cycle was thus observed but there were no differences between the total prevalence or the total relative density of the parasite in the two areas. Since there is no evidence of parasite-induced host mortality, or for the development of protective immunity, the main regulatory process in the heated area are most likely an increased mortality due to reduced thermal tolerance of the adult parasite.

Keywords

Paradiplozoon homoionRutilus rutilusprevalencerelative densityecologytemperatureSweden
Type
Research Article
Information
Journal of Helminthology , Volume 63 , Issue 2 , June 1989 , pp. 93 - 101
Copyright
Copyright © Cambridge University Press 1989

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