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The Hydrobia ulvae–Maritrema subdolum association: cercarial emergence controlled by host activity

Published online by Cambridge University Press:  12 April 2024

K.N. Mouritsen
K.N. Mouritsen*
Affiliation:
Department of Marine Ecology, Institute of Biological Sciences, University of Aarhus, Finlandsgade 14, 8200 Aarhus N, Denmark
*
*Address for correspondence: Department of Zoology, University of Otago, PO Box 56, Dunedin, New Zealand Fax: +64 3 479 7584 E-mail [email protected]
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Abstract

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The release of Maritrema subdolum cercariae (Digenea: Microphallidae) from the marine mud snail Hydrobia ulvae is significantly affected by temperature, salinity, light and exudates from the second intermediate amphipod host. Based on (i) previously published data on temperature–salinity dependent H. ulvae activity, (ii) new experimental data on H. ulvae activity in light and darkness as well as in the presence and absence of host exudates, and (iii) the cercarial emergence rate from free moving snails and snails prevented from crawling, the present analysis indicates that emergence of M. subdolum larvae is regulated mainly by host activity as the ultimate factor for release. The adaptive significance of such an emergence strategy is emphasized.

Type
Research Article
Information
Journal of Helminthology , Volume 76 , Issue 4 , December 2002 , pp. 349 - 353
Copyright
Copyright © Cambridge University Press 2002

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