Graduate Thesis Or Dissertation
 

Marine Heatwaves Influence Depth Preferences of Chinook Salmon (Oncorhynchus tshawytscha)

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https://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/mp48sm36k

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  • Marine heatwaves have become more common over the past several years. The 2014-2015 ‘warm blob’ had profound effects on marine ecosystems in the Northeast Pacific. Given the particular habitat needs of Chinook Salmon (Oncorhynchus tshawytscha) we wanted to examine the impacts of the heatwave on Chinook depth distribution. We examined fishery and temperature data from 2012-2015; the two years preceeding the heatwave and the two years during the heatwave. A mixed effects model indicated that extended periods of anomalous temperatures caused increased depth of capture. All stocks included in the study showed significant differences in their response to this heatwave. Oceanographic factors were also a major variable, with downwelling resulting in deeper depths of capture, depending on the intensity and length of expression of alternate states. There was also an observed general pattern that salmon preferred greater depths in the later summer months. While this finding is supported by limited other literature, more research is necessary in order to better predict how chinook will react to heatwaves in the future.
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  • Teahan, A. J, Bellinger, M. R., Miller, S., Banks, M. A. (2020) Marine Heatwaves Influence Depth Preferences of Chinook Salmon (Oncorhynchus tshawytscha)
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