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Managing for Atlantic Salmon Smolt Run Timing Variability in a Changing Climate
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2023
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Source: North American Journal of Fisheries Management, 43(2), 517-538
[PDF-4.67 MB]
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Journal Title:North American Journal of Fisheries Management
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Description:The Gulf of Maine Distinct Population Segment of Atlantic Salmon Salmo salar is listed under the U.S. Endan- gered Species Act, with dams cited as a key threat to the species. Safe, timely, and ef ficient passage of emigrating smolts is critical for advancing recovery goals. However, climate change and the earlier (and more variable) onset of smolt migration have challenged the effectiveness of measures designed to protect smolts. Therefore, we used datafrom four long-term smolt trapping sites in Maine to characterize run duration, identify a standardized smolt run, and develop a predictive model for the initiation of smolt emigration for natural- and hatchery-origin smolts. We combined these data into a basinwide deterministic model that projects the movement of smolts from their point of origin toestuary entry, which we used to (1) evaluate duration and temperature triggers for supplemental spill periods used athydroelectric dams to protect smolts and (2) investigate how knowledge of smolt emigration dynamics can guide pro-
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Source:North American Journal of Fisheries Management, 43(2), 517-538
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ISSN:0275-5947;1548-8675;
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Rights Information:CC BY-NC-ND
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