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Spatio-temporal associations of albacore CPUEs in the Northeastern Pacific with regional SST and climate environmental variables

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https://ir.library.oregonstate.edu/concern/articles/dn39x331j

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  • This study investigated the spatial distribution of juvenile North Pacific albacore (Thunnus alalunga) in relation to local environmental variability [i.e. sea surface temperature (SST)], and two large-scale indices of climate variability, [the Pacific Decadal Oscillation (PDO) and theMultivariate El Nino/Southern Oscillation Index (MEI)]. Changes in local and climate variables were correlated with 48 years of albacore troll catch per unit effort (CPUE) in 18 latitude/longitude cells, using threshold Generalized Additive Mixed Models (tGAMMs). Model terms were included to account for non-stationary and spatially variable effects of the intervening covariates on albacore CPUE. Results indicate that SST had a positive and spatially variable effect on albacore CPUE, with increasingly positive effects to the North,while PDO had an overall negative effect.Although albacore CPUE increased with SST both before and after a threshold year of 1986, such effect geographically shifted north after 1986. This is the first study to demonstrate the non-stationary spatial dynamics of albacore tuna, linked with a major shift of the North Pacific.Results imply that if ocean temperatures continue to increase, US west coast fisher communities reliant on commercial albacore fisheries are likely to be negatively affected in the southern areas but positively affected in the northern areas, where current albacore landings are highest.
  • Keywords: regime shifts, albacore, spatial distribution, temporal distribution, environmental variables
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  • Phillips, A. J., Ciannelli, L., Brodeur, R. D., Pearcy, W. G., & Childers, J. (2014). Spatio-temporal associations of albacore CPUEs in the Northeastern Pacific with regional SST and climate environmental variables. ICES Journal of Marine Science, 71(7), 1717-1727. doi:10.1093/icesjms/fst238
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  • 71
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  • 7
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  • This report was prepared by Oregon Sea Grant under grant number NA06OAR4170010 (project number R/RCF-25) from the National Oceanic and Atmospheric Administration’s National Sea Grant College Program, U.S. Department of Commerce, and by appropriations made by the Oregon State Legislature.We would also like to acknowledge that Richard Brodeur was supported by funding provided by the NWFSC and John Childersand the collection of albacore data were supported by funding provided by the SWFSC.
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