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The Relative Effects of Biotic and Abiotic Factors on the Recruitment of Freshwater Mussels (Margaritifera laevis)

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Title: The Relative Effects of Biotic and Abiotic Factors on the Recruitment of Freshwater Mussels (Margaritifera laevis)
Authors: Kawajiri, Keita Browse this author
Ishiyama, Nobuo Browse this author
Miura, Kazuki Browse this author
Terui, Akira Browse this author
Sueyoshi, Masanao Browse this author
Nakamura, Futoshi Browse this author →KAKEN DB
Keywords: conservation measure
host fish density
population decline
agricultural land use
Oncorhynchus masou masou
Issue Date: May-2021
Publisher: MDPI
Journal Title: Water
Volume: 13
Issue: 9
Start Page: 1289
Publisher DOI: 10.3390/w13091289
Abstract: Freshwater mussels, Unionoida, are endangered across the globe due to recruitment failure. In the present study, with general linear mixed models, we investigated the relative effects of biotic (host fish density) and abiotic (water depth, fine sediment, water temperature, and water quality) factors on the recruitment of Margaritifera laevis in 10 streams of Hokkaido, northern Japan. We additionally examined the factors regulating the density of the host fish Oncorhynchus masou masou with general linear models. The proportion of juvenile mussels had a unimodal relationship with the host density, which was the most influential factor among the others examined. The positive relationship between mussel recruitment and host density can be attributed to an increased host fish infection rate. The negative correlation between mussel recruitment and host density at high fish densities may be due to reduced larval growth on host fish that are in poor physical condition. We also found that host fish density was negatively affected by nutrient enrichment. Our results suggest that mitigating water quality degradation to recover host fish density should be prioritized to improve mussel recruitment. Although stock enhancement is effective for increasing the salmon population density, excess stocking can further disturb mussel recruitment.
Rights: https:// 4.0/
Type: article
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

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