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Some effects of population density in infections of Diphyllobothrium dendriticum (Nitzsch) in golden hamster (Mesocricetus auratus Waterhouse) and common gull (Larus canus L.)

Published online by Cambridge University Press:  06 April 2009

Odd Halvorsen  and
Karin Andersen
Odd Halvorsen
Affiliation:
Zoological Museum, University of Oslo, Sars gt. 1, Oslo 5, Norway
Karin Andersen
Affiliation:
Zoological Museum, University of Oslo, Sars gt. 1, Oslo 5, Norway
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Extract

Golden hamsters were given plerocercoids of Diphyllobothrium dendriticum either singly or in groups of 2, 4, 8 or 15. There was a higher rate of recovery of worms from hamsters given many (8 and 15) than from those given few (1, 2 or 4) plerocercoids. The difference in rate of recovery of worms was present from 2 h after administration of plerocercoids and persisted up to day 20 when experiments were ended. Denser tapeworm populations had the smallest individuals and some of them contained worms with primary strobilae at the start of egg production. The size of the tapeworm population did not influence the prepatent time. Also, with the common gull there was a higher rate of recovery of worms when plerocercoids were given in groups. These results are discussed in relation to aspects of the life-cycle of D. dendriticum where the natural final host is most probably normally infected by a larger number of plerocercoids at the same time.

Type
Research Article
Information
Parasitology , Volume 69 , Issue 2 , October 1974 , pp. 149 - 160
Copyright
Copyright © Cambridge University Press 1974

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