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The Influence of Polydora ciliata (Johnst.) on the Degree of Parasitism of Mytilus edulis L. by Mytilicola intestinalis Steuer

C. S. Williams
Journal of Animal Ecology
Vol. 37, No. 3 (Oct., 1968), pp. 709-712
DOI: 10.2307/3083
Stable URL: http://www.jstor.org/stable/3083
Page Count: 4
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
The Influence of Polydora ciliata (Johnst.) on the Degree of Parasitism of Mytilus edulis L. by Mytilicola intestinalis Steuer
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Abstract

1. Approximately one-quarter of the mussels at Whitstable are infested by the tubicolous polychaete Polydora ciliata. 2. The effect of this annelid on the numbers of the parasitic copepod Mytilicola intestinalis has been investigated, and it has been shown to cause a significant decrease in numbers present in the host. 3. The infection of all mussels by juvenile stages of Mytilicola in the breeding season is approximately the same; the decline in numbers of parasites during the autumn and winter is more marked if Polydora is present. 4. Mussels infested by Polydora can support fewer Mytilicola because there is less food available for the copepod.

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