The effects of endangered freshwater pearl mussels on channel morphology and flow in a low-gradient sandy river

Miura, Kazuki; Watanabe, Norihiro; Takagi, Yuuka; Ishiyama, Nobuo; Negishi, Junjiro N.

doi:10.1007/s10750-021-04696-6

Cited by 6 publications

(2 citation statements)

References 67 publications

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“…Their vulnerability is largely derived from their complex life cycle, which requires host fish parasitization during their larval (‘glochidial’) phase (the larva is called a ‘glochidium’) (Modesto et al, 2018). Many mussel populations face a high risk of extinction owing to recruitment failure (Varandas et al, 2013; Sousa et al, 2016; Miura et al, 2021). Their longevity (4–190 years) allows them to persist for a long time, even in non‐recruiting populations (Geist, 2010; Haag & Rypel, 2011).…”

Section: Introductionmentioning

confidence: 99%

Effects of multiple stressors on recruitment of long‐lived endangered freshwater mussels

Miura,

Ishiyama,

Negishi

et al. 2023

Aquatic Conservation

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Multiple stressors can affect populations interactively. However, the process by which they affect recruitment remains unclear, especially in long‐lived organisms with complex life cycles. This study explored the bottleneck stages of juvenile recruitment in the endangered freshwater pearl mussel Margaritifera togakushiensis and the interactive effects of nutrients and fine sediments on these stages. The proportion of M. togakushiensis juveniles aged ≤10 years was investigated in 24 rivers from north‐eastern Japan. Margaritifera togakushiensis has a complex life cycle with an obligate parasitic larval stage. Gravid female density, glochidia density (the number of glochidial infections per stream area), and juvenile survival rate, used as indices for adult, parasitic, and post‐parasitic juvenile stages, respectively, were obtained from 11 of these rivers. Twenty‐four population status assessments showed that the proportion of juveniles aged ≤10 years ranged from 0.00 to 0.23, and that they were absent in 12 rivers. Parasitic and post‐parasitic juvenile stages were bottlenecks for recruitment; juvenile survival rates had a stronger positive effect on recruitment in rivers with high glochidia density. Juvenile survival rate was negatively associated with the synergistic effects of nutrients and fine sediments, although factors limiting glochidia density were not identified. These findings suggest that the interaction between nutrients and fine sediments can synergistically reduce the recruitment of M. togakushiensis, indicating an underestimated impact of stressors on mussel recruitment if treated individually. Future mitigation measures should consider both nutrient levels and fine sediments to restore mussel recruitment. These results also emphasize the importance of considering both parasitic and post‐parasitic juvenile stages of mussels to maximize the success of future restoration actions.

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Section: Introductionmentioning

confidence: 99%

Effects of multiple stressors on recruitment of long‐lived endangered freshwater mussels

Miura,

Ishiyama,

Negishi

et al. 2023

Aquatic Conservation

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“…However, they are among the most imperiled faunal groups of organisms (Lopes-Lima et al 2018). The conservation of freshwater mussels is important for maintaining the structure and function of freshwater ecosystems (Miura et al 2021b).…”

Section: Introductionmentioning

confidence: 99%

Recruitment status and host-fish-limitation threats to endangered freshwater pearl mussel (Margaritifera laevis) in eastern Hokkaido, northern Japan

Miura,

Ishiyama,

Negishi

et al. 2023

Landscape Ecol Eng

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Recruitment failure is a major threat to freshwater mussel (Order Unionoida) populations worldwide. Assessments of the recruitment status and determining the bottleneck factors of mussel recruitment are crucial for preventing future declines in mussel populations. In this study, we investigated the recruitment status (i.e., size structure and the proportion of juveniles within a population) of the endangered freshwater pearl mussel Margaritifera laevis in 22 rivers in eastern Hokkaido, northern Japan. We also quantified the density of the host fish Oncorhynchus masou masou and examined the relationship between the proportion of juveniles and host-fish density to assess host-limitation threats to M. laevis recruitment. Our assessments showed that 13 (59.1%) rivers had no signs of recent recruitment within 10 years, with a low mean proportion of juveniles (mean:0.02 [range:0.00-0.09] fraction), indicating that these populations are threatened by sustained recruitment failure. The proportion of juveniles was positively associated with host-fish density, suggesting that host-fish limitation could be a bottleneck factor for M. laevis recruitment. These results highlight the urgent need for prompt conservation measures, including the enhancement of host-fish availability, to sustain M. laevis populations in the study region.

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Limitations of beta diversity in conservation site selection

Rocha

Morris

Cottenie

et al. 2023

Ecological Indicators

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The effects of endangered freshwater pearl mussels on channel morphology and flow in a low-gradient sandy river

Cited by 6 publications

References 67 publications

Effects of multiple stressors on recruitment of long‐lived endangered freshwater mussels

Effects of multiple stressors on recruitment of long‐lived endangered freshwater mussels

Recruitment status and host-fish-limitation threats to endangered freshwater pearl mussel (Margaritifera laevis) in eastern Hokkaido, northern Japan

Limitations of beta diversity in conservation site selection

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