A potential mechanism of global decline in freshwater mussel (Unionida: Bivalvia) abundance and diversity is disruption of their obligate parasitic life-cycle by non-native fish species, which may introduce novel interaction pathways that threaten unionid recruitment. We assessed three non-native fish (brown bullhead catfish, Ameiurus nebulosus; rudd, Scardinius erythrophthalmus; and goldfish, Carassius auratus) as glochidial hosts for the New Zealand freshwater mussel Echyridella menziesii to test the hypotheses that (i) non-native fish will have lower glochidial attachment rates than a native fish (the common bully Gobiomorphus cotidianus), and (ii) encystment rate will be lower on non-native species. We found that the non-native fish had significantly lower total glochidial attachment than the native control fish after infestation and did not produce ecologically significant quantities of juvenile mussels. This research supports the general assumption that non-native species are less suitable hosts of native freshwater mussels. However, confirming our findings in the field will indicate if removing non-native fish or enhancing native fish populations is recommended for conservation of E. menziesii populations in New Zealand.
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This work was funded by the Ministry of Business, Innovation and Employment (New Zealand’s Biological Heritage NSC, C09X1501). The authors thank Elizabeth Graham and Paul Brown for statistical advice, Anita Pearson, Anne Wecking, Brendan Hicks, Michéle Melchior, Nicole Hanrahan, Tracey Burton, and Warrick Powrie for field work assistance, Karen Thompson for laboratory assistance, and Kevin Collier, Ian Duggan, and anonymous reviewers for valuable feedback and comments to improve the quality of the manuscript. All authors declare that they have no conflicts of interest to disclose.
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Moore, T.P., Clearwater, S.J. Non-native fish as glochidial sinks: elucidating disruption pathways for Echyridella menziesii recruitment. Hydrobiologia (2019). https://doi.org/10.1007/s10750-019-04035-w
- Biotic homogenization
- Enemy release hypothesis
- Freshwater mussels
- Host–parasite interactions