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Responses in growth rate of larval northern anchovy (Engraulis mordax) to anomalous upwelling in the northern California Current

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dc.creator Takahashi, Motomitsu
dc.creator Checkley, David M., Jr.
dc.creator Litz, Marisa N. C.
dc.creator Brodeur, Richard D.
dc.creator Peterson, William T.
dc.date.accessioned 2012-11-12T21:58:03Z
dc.date.available 2012-11-12T21:58:03Z
dc.date.issued 2012-11
dc.identifier.citation TAKAHASHI, M., CHECKLEY, D. M., LITZ, M. N. C., BRODEUR, R. D., & PETERSON, W. T. (2012). Responses in growth rate of larval northern anchovy (engraulis mordax) to anomalous upwelling in the northern california current. Fisheries Oceanography, 21(6), 393-404. doi: 10.1111/j.1365-2419.2012.00633.x en_US
dc.identifier.uri http://hdl.handle.net/1957/35051
dc.description This is the publisher’s final pdf. The published article is copyrighted by Blackwell Publishing Ltd. and can be found at: http://onlinelibrary.wiley.com/journal/10.1111/%28ISSN%291365-2419. To the best of our knowledge, one or more authors of this paper were federal employees when contributing to this work. en_US
dc.description.abstract We examined variability in growth rate during the larval stage of northern anchovy (Engraulis mordax) in response to physical and biological environmental factors in 2005 and 2006. The onset of spring upwelling was anomalously delayed by 2–3 months until mid-July in 2005; in contrast, spring upwelling in 2006 began as a normal year in the northern California Current. Larval and early juvenile E. mordax were collected in August, September, and October off the coast of Oregon and Washington. Hatch dates ranged from May to September, with peaks in June and August in 2005 and a peak in July in 2006, based on the number of otolith daily increments. Back-calculated body length-at-age in the June 2005 hatch cohort was significantly smaller than in the August 2005 cohort, which had comparable growth to the July 2006 cohort. Standardized otolith daily increment widths as a proxy for seasonal variability in somatic growth rates in 2005 were negative until late July and then changed to positive with intensification of upwelling. The standardized increment width was a positive function of biomass of chlorophyll a concentration, and neritic cold-water and oceanic subarctic copepod species sampled biweekly off Newport, Oregon. Our results suggest that delayed upwelling in 2005 resulted in low food availability and, consequently, reduced E. mordax larval growth rate in early summer, but once upwelling began in July, high food availability enhanced larval growth rate to that typical of a normal upwelling year (e.g., 2006) in the northern California Current. en_US
dc.description.sponsorship This study was supported in part by the Japan Society for the Promotion of Science (JSPS) through a Postdoctoral Fellowship for Research Abroad and the Research Fellowships for Young Scientists. Funding for the collection and processing of samples was provided in part by the Bonneville Power Administration, NOAA Stock Assessment Improvement Program and the U.S.GLOBEC – Northeast Pacific Program. en_US
dc.language.iso en_US en_US
dc.publisher Blackwell Publishing Ltd. en_US
dc.relation.ispartofseries Fisheries Oceanography en_US
dc.relation.ispartofseries Vol. 21 no. 6 en_US
dc.subject California Current en_US
dc.subject delayed upwelling en_US
dc.subject growth rate en_US
dc.subject increment width en_US
dc.subject northern anchovy en_US
dc.subject otolith en_US
dc.title Responses in growth rate of larval northern anchovy (Engraulis mordax) to anomalous upwelling in the northern California Current en_US
dc.type Article en_US
dc.description.peerreview yes en_US
dc.identifier.doi 10.1111/j.1365-2419.2012.00633.x

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