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Potential Local Extirpation of an Imperiled Freshwater Mussel Population from Wildfire Runoff
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2022
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Source: Western North American Naturalist, 82(4)
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Journal Title:Western North American Naturalist
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Description:Effects of wildfire and subsequent hydric erosion on freshwater communities are of increasing interest. While freshwater biodiversity is in a global state of decline, examples of climate-driven wildfire impacts to freshwater mussel populations are especially limited. We discovered a population of native floater mussels (Anodonta californiensis/nuttalliana), documented fish species, and recorded data on river substrate characteristics before and after an influx of wildfire runoff in Monterey County, California, USA. Pre-wildfire runoff surveys documented robust and naturally reproducing populations of mussels and 3 species of native fishes (Monterey sucker, Catostomus occidentalis mnioltiltus; Monterey roach, Lavinia symmetricus subditus; and Sacramento pikeminnow, Ptychocheilus grandis). Post-wildfire, we did not detect live mussels using visual, tactile, and environmental DNA; and live fish observations included only Monterey roach and speckled dace (Rhinichthys osculus). River substrates shifted to sand, and thalweg depth decreased from 1.77 m to only 0.2 m. The potential for future extreme wildfire runoff to impact aquatic systems, and freshwater mussels specifically, should be more broadly evaluated. Increasing duration and severity of wildfire seasons in particular appear to be major future and additional challenges to freshwater mussels and ecosystems worldwide.
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Source:Western North American Naturalist, 82(4)
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DOI:
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ISSN:1527-0904
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Rights Information:Other
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Compliance:Library
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