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Relationships of Some Species of Digenea with the Marine Prosobranch Littorina littorea (L.) III. The Effect of Larval Digenea on the Glycogen content of the Digestive Gland and Foot of L. littorea

Published online by Cambridge University Press:  18 November 2009

E. M. Robson  and
I. C. Williams
E. M. Robson
Affiliation:
Department of Zoology, The University, Hull
I. C. Williams
Affiliation:
Department of Zoology, The University, Hull
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Summary

1. Individual chemical estimations of the glycogen concentration of the digestive gland and the foot were made on 272 uninfected L. littorea and 395 L. littorea infected with larval Digenea from Scalby Rocks, North Yorkshire, during the period from September 1966 to November 1967.

2. The glycogen concentrations of the digestive gland and the foot of both infected and uninfected L. littorea showed pronounced seasonal changes, being highest during the autumn and lowest in the spring. Infected L. littorea had less glycogen in the digestive gland and foot than had uninfected L. littorea, and the amount of reduction was characteristic for each of the three species studied, namely Cryptocotyle lingua, Renicola roscovita and H. leptosoma. Infection with C. lingua caused greater decrease in the glycogen concentration of the digestive gland, while infection with R. roscovita had a more marked effect on the foot. The effect of infection with H. leptosoma and with concurrent infections with two species are described and considered.

3. The seasonal changes in the amount of glycogen in the digestive gland and the foot of uninfected and infected L. liitorea are considered in relation to seasonal reproductive changes and the ecology of the host at Scalby Rocks.

Type
Research Papers
Information
Journal of Helminthology , Volume 45 , Issue 4 , December 1971 , pp. 381 - 401
Copyright
Copyright © Cambridge University Press 1971

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