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Parasites shape community structure and dynamics in freshwater crustaceans

Published online by Cambridge University Press:  04 November 2019

Olwyn C. Friesen*
Department of Zoology, 340 Great King St, University of Otago, Dunedin9016, New Zealand
Sarah Goellner
Center for Integrative Infectious Diseases, Im Neuenheimer Feld 344, University of Heidelberg, Heidelberg69120, Germany
Robert Poulin
Department of Zoology, 340 Great King St, University of Otago, Dunedin9016, New Zealand
Clément Lagrue
Department of Zoology, 340 Great King St, University of Otago, Dunedin9016, New Zealand Department of Biological Sciences, CW 405, Biological Sciences Building, University of Alberta, Edmonton, AlbertaT6G 2E9, Canada
Author for correspondence: Olwyn C. Friesen, E-mail:


Parasites directly and indirectly influence the important interactions among hosts such as competition and predation through modifications of behaviour, reproduction and survival. Such impacts can affect local biodiversity, relative abundance of host species and structuring of communities and ecosystems. Despite having a firm theoretical basis for the potential effects of parasites on ecosystems, there is a scarcity of experimental data to validate these hypotheses, making our inferences about this topic more circumstantial. To quantitatively test parasites' role in structuring host communities, we set up a controlled, multigenerational mesocosm experiment involving four sympatric freshwater crustacean species that share up to four parasite species. Mesocosms were assigned to either of two different treatments, low or high parasite exposure. We found that the trematode Maritrema poulini differentially influenced the population dynamics of these hosts. For example, survival and recruitment of the amphipod Paracalliope fluviatilis were dramatically reduced compared to other host species, suggesting that parasites may affect their long-term persistence in the community. Relative abundances of crustacean species were influenced by parasites, demonstrating their role in host community structure. As parasites are ubiquitous across all communities and ecosystems, we suggest that the asymmetrical effects we observed are likely widespread structuring forces.

Research Article
Copyright © Cambridge University Press 2019

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