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Effects of parasitic freshwater mussels on their host fishes: a review
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0002-6541-4795
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0002-4417-6636
Lund University.ORCID iD: 0000-0002-3541-9835
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Environmental and Life Sciences (from 2013).ORCID iD: 0000-0001-6758-5857
2022 (English)In: Parasitology, ISSN 0031-1820, E-ISSN 1469-8161, Vol. 149, no 14, p. 1958-1975Article in journal (Refereed) Published
Abstract [en]

Freshwater mussels in the order Unionida are highly adapted to parasitize fish for the primary purpose of dispersal. The parasitic larval stage affixes itself to the gills or fins of the host where it becomes encysted in the tissue, eventually excysting to develop into a free-living adult. Research on the parasitic interactions between unionids and their host fishes has garnered attention recently due to the increase in worldwide preservation efforts surrounding this highly endangered and ecologically significant order. With the exception of heavy infestation events, these mussels cause minor effects to their hosts, typically only observable effect in combination with other stressors. Moreover, the range of effect intensities on the host varies greatly with the species involved in the interaction, an effect that may arise from different evolutionary strategies between long- and short-infesting mussels; a distinction not typically made in conservation practices. Lower growth and reduced osmotic potential in infested hosts are commonly observed and correlated to infestation load. These effects are typically also associated with increases in metabolic rate and behaviour indicative of stress. Host fish seem to compensate for this through a combination of rapid wound healing in the parasitized areas and higher ventilation rates. The findings are heavily biased towards Margaritifera margaritifera, a unique mussel not well suited for cross-species generalizations. Furthermore, the small body of molecular and genetic studies should be expanded as many conclusions are drawn from studies on the ultimate effects of glochidiosis rather than proximate studies on the underlying mechanisms.

Place, publisher, year, edition, pages
Cambridge University Press, 2022. Vol. 149, no 14, p. 1958-1975
Keywords [en]
Conservation, freshwater mussel, glochidia, host effects, Unionida
National Category
Ecology
Research subject
Biology
Identifiers
URN: urn:nbn:se:kau:diva-92190DOI: 10.1017/S0031182022001226ISI: 000861626100001PubMedID: 36050917Scopus ID: 2-s2.0-85138174333OAI: oai:DiVA.org:kau-92190DiVA, id: diva2:1703232
Funder
Karlstad UniversityEuropean Commission, LIFE18 NAT/SE/000742Available from: 2022-10-12 Created: 2022-10-12 Last updated: 2023-02-01Bibliographically approved

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Rock, Sebastian L.Watz, JohanÖsterling, Martin

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