Title

Host and parasite counteradaptations: an example from a freshwater snail.

Document Type

Article

Publication Date

1-1-1985

Abstract

Trematode infection of pulmonate snails is often associated with increased growth and/or survivorship of snail hosts. The freshwater pulmonate Lymnaea elodes and its trematode parasites are used to test whether this increase is a parasite adaptation, a host adaptation, or a side effect that serves no adaptive function for either participant. Field experiments indicate that trematode parasitism significantly reduces host fecundity and causes a temporary elevation and subsequent reduction in host growth. A 2- yr field survey of the prevalence of trematode infection in 3 snail populations revealed a significant positive relationship between shell size and prevalence. L. elodes does not outlive its trematode infections. Overall, results suggest that increased survivorship in trematode-infected L. elodes is a parasite strategy for providing a stable, long-term resource for the parasite. -from Authors

Publication Title

American Naturalist

This document is currently not available here.

Share

COinS