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Proterometra macrostoma (Digenea: Azygiidae): variations in cercarial morphology and physiology

Published online by Cambridge University Press:  06 April 2009

M. W. Riley  and
G. L. Uglem
M. W. Riley
Affiliation:
School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506, USA
G. L. Uglem
Affiliation:
School of Biological Sciences, University of Kentucky, Lexington, Kentucky 40506, USA
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Summary

Snails, Elimia semicarinata, infected with Proterometra macrostoma were collected monthly in 1990 and 1991 from North Elkhorn Creek near Lexington, Kentucky, and kept on a 12:12 h light–dark cycle for 2 weeks. Cercariae emerging from snails were classified into 8 strains (I–VIII) based on differences in number and distribution of spined and spineless papillae on the tail. Cercariae also had unique patterns of emergence, swimming behaviour and infectivity in 4 species of sunfish. Of 513 infected snails collected in May, 339 had pure infections with the strain frequencies (% of 339): I, 46·6; II, 7·7; III, 12·1; IV, 8·8; V, 0·6; VI, 2·7; VII, 11·8; VIII, 9·7. In the multiple infections, 159 snails shed 2 strains, 14 shed 3, and 1 snail shed 4 strains simultaneously. A comparison of sunfish and parasite populations in Kentucky, Ohio and Michigan indicated that strain frequency in P. macrostoma is regulated by the species composition of the sunfish population.

Keywords

digenetic trematodeProterometra macrostomacercarial variationsstrains
Type
Research Article
Information
Parasitology , Volume 110 , Issue 4 , May 1995 , pp. 429 - 436
Copyright
Copyright © Cambridge University Press 1995

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