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California steelhead populations were regionally buffered and individually resistant to a severe multi-year drought
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2024
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Source: Canadian Journal of Fisheries and Aquatic Sciences, 81(11), 1594-1605
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Journal Title:Canadian Journal of Fisheries and Aquatic Sciences
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Description:Weather extremes, such as drought, are predicted to be a strong determinant of species persistence under climate change. Yet predictions often fail to consider that variation in streamflow responses, variation in population dynamics, or adaptations to drought could buffer species against extremes. In this study, we examined the responses of eight California (USA) steelhead populations to a severe drought from 2012 to 2016. We observed that streamflows were highly synchronous across the region in all seasons and did not appear to buffer drought impacts. Population dynamics were variable across the region and did appear to buffer the region from drought impacts. Some populations had very low productivity for 4 years associated with the drought, while others had slightly below-average productivity for only 2 years. Population synchrony was associated with spring-smolt flow, temperature, and drought over time, but was not associated with winter-spawner or summer-juvenile drought, suggesting populations may be adapted to drought conditions. Our results highlight how regional buffering and adaptation can be important mechanisms against climate extremes both now and into the future.
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Source:Canadian Journal of Fisheries and Aquatic Sciences, 81(11), 1594-1605
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ISSN:0706-652X;1205-7533;
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Rights Information:CC BY
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Compliance:Submitted
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