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Malick, Michael J.; Hunsicker, Mary E.; Haltuch, Melissa A.; Parker-Stetter, Sandra L.; Marshall, Kristin N.; Pohl, John E.; Berger, Aaron M.; Siedlecki, Samantha A.; Gauthier, Stéphane; Hermann, Albert J.
Canadian journal of fisheries and aquatic sciences, 02/2024, Letnik: 81, Številka: 2Journal Article
In the California Current Ecosystem, the California Undercurrent (CU) is the predominate subsurface current that transports nutrient-rich water from southern California poleward. In this study, we used a large dataset of spatially explicit in situ observations of Pacific hake ( Merluccius productus) and the CU (36.5–48.3°N) to estimate relationships between northward undercurrent velocity and hake distribution and determine whether these relationships vary across space or life-history stage. We found that both hake occurrence and density had strong spatially complex relationships with the CU. In areas north of 44°N (central Oregon), the CU effect was spatially consistent and opposite for occurrence (negative) and density (positive), indicating that hake may aggregate in areas of high northward velocity in this region. In areas south of 44°N, the CU effect showed a cross-shelf gradient for both occurrence and density, indicating a more nearshore hake distribution when northward velocity is higher in this region. Together, our results suggest that future changes in the CU due to climate change are likely to impact hake differently in northern and southern areas.
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