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The influence of trematodes on the macroalgae consumption by the common periwinkle Littorina littorea

Published online by Cambridge University Press:  29 July 2008

Karin T. Clausen ,
Martin H. Larsen ,
Nina K. Iversen  and
Kim N. Mouritsen
Karin T. Clausen
Affiliation:
Department of Biological Sciences, University of Aarhus, Finlandsgade 14, DK-8200 Aarhus N, Denmark
Martin H. Larsen
Affiliation:
Department of Biological Sciences, University of Aarhus, Finlandsgade 14, DK-8200 Aarhus N, Denmark
Nina K. Iversen
Affiliation:
Department of Biological Sciences, University of Aarhus, Finlandsgade 14, DK-8200 Aarhus N, Denmark
Kim N. Mouritsen*
Affiliation:
Department of Biological Sciences, University of Aarhus, Finlandsgade 14, DK-8200 Aarhus N, Denmark
*
Correspondence should be addressed to: Kim N. Mouritsen, Department of Biological Sciences, Marine Ecology, University of Aarhus, Finlandsgade 14, DK-8200 Aarhus N, Denmark email: kim.mouritsen@biology.au.dk
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Abstract

Trematodes are ubiquitous elements of coastal ecosystems that commonly modify the phenotype of their invertebrate hosts, often with ramifications to higher levels of ecological organization. In this context, trematode infections have been suggested to reduce the consumption of the herbivorous gastropod Littorina littorea (L.) (Mollusca: Gastropoda), in turn affecting the composition of the macroalgal community on which the snail grazes. Here, we examine the effect of two species of trematodes, Renicola roscovita and Himasthla elongata, on L. littorea's consumption in two outdoor microcosm experiments offering the snails two different ephemeral green algae species as a food source. Our results show that, irrespective of the species of parasite and food source, infection decreases consumption: uninfected snails consumed up to 65% more macroalgal biomass than infected snails. Aside from infection status, gender and size also influenced the snails' consumption rate significantly. The differing histopathological impacts of the two species of trematodes on the hosts' gonad–digestive gland complex (in which the parasites reside), suggests that parasitic castration is a likely mechanism for the reduced energy demand of infected periwinkles. Together with existing evidence, our investigation suggests that trematodes in general depress the grazing activity of L. littorea, and that the resulting community regulation occurs throughout the snails' distributional range.

Keywords

consumptionEnteromorpha intestinalisHimasthla elongatamacroalgae communityparasitesRenicola roscovitaUlva lactuca
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 88 , Issue 7 , November 2008 , pp. 1481 - 1485
Copyright
Copyright © Marine Biological Association of the United Kingdom 2008

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