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Elevated stream temperature, origin, and individual size influence Chinook salmon prespawn mortality across the Columbia River Basin
Fisheries Research ( IF 2.4 ) Pub Date : 2021-01-22 , DOI: 10.1016/j.fishres.2021.105874
Tracy E. Bowerman , Matthew L. Keefer , Christopher C. Caudill

Conservation and restoration efforts for Pacific salmon Oncorhynchus spp. can be hampered by prespawn mortality, when adult fish reach reproductive sites but die before spawning. We examined annual estimates of female Chinook salmon O. tshawytscha prespawn mortality relative to individual fish traits (77,707 individual females) and reach-scale variables in 49 study reaches from 41 streams throughout the interior Columbia River Basin. Mean annual prespawn mortality estimates across 14 years ranged from 0 % to 65 %. For spring-run Chinook salmon, the probability of prespawn mortality decreased over the spawning period, was positively associated with mean August stream temperature and individual fish length, and was higher for hatchery-origin than natural-origin fish. Based on the basin-wide statistical model and future stream temperature predictions, average spring-run Chinook salmon prespawn mortality rates in 2040 were predicted to increase by 0–17 % for fish of natural origin and 1–17 % for fish of hatchery origin. Climate change is likely to exacerbate conditions that lead to prespawn mortality, particularly in low elevation stream reaches, for larger fish, and for those of hatchery origin.



中文翻译:

溪流温度,起源和个体大小的升高会影响整个哥伦比亚河流域的奇努克鲑鱼产卵前的死亡率

太平洋鲑鱼Oncorhynchus spp的保护和恢复工作。成年鱼到达繁殖场所但在产卵前死亡,会受到产前死亡率的阻碍。我们检查了雌性奇努克鲑鱼O.tshawytscha的年度估算值相对于单个鱼类性状的产卵前死亡率(77,707个个体)和49个研究中的范围尺度变量来自整个哥伦比亚河盆地内部的41条溪流。在14年中,产前平均年死亡率的估计范围为0%至65%。对于春季运行的奇努克鲑鱼,产卵前死亡的可能性在产卵期降低,与平均八月河水温度和个体鱼类长度呈正相关,孵化场起源的鲑鱼高于自然起源的鱼类。根据整个流域的统计模型和对未来溪流温度的预测,到2040年,春季自然栖息地的奇努克鲑鱼产前平均死亡率预计将增加0-17%,孵化场鱼类将增加1-17%。

更新日期:2021-01-22
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