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ICES Journal of Marine Science: Journal du Conseil Advance Access originally published online on February 5, 2008
ICES Journal of Marine Science: Journal du Conseil 2008 65(2):174-190; doi:10.1093/icesjms/fsn001
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© 2008 International Council for the Exploration of the Sea. Published by Oxford Journals. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Natural variability in {delta}18O values of otoliths of young Pacific sardine captured in Mexican waters indicates subpopulation mixing within the first year of life

Sonia R. Valle and Sharon Z. Herzka

Department of Biological Oceanography, Center for Scientific Research and Higher Education of Ensenada (CICESE), km 107 Carretera Tijuana-Ensenada, CP 22860 Ensenada, Baja California, Mexico, and PO Box 434844, San Diego, CA 92143, USA

Correspondence to S. Z. Herzka: tel: +52 646 175 0500; fax: +52 646 1750587; e-mail: sherzka{at}cicese.mx

Valle, S. R., and Herzka, S. Z. 2008. Natural variability in {delta}18O values of otoliths of young Pacific sardine captured in Mexican waters indicates subpopulation mixing within the first year of life. – ICES Journal of Marine Science, 65: 174–190.

Oxygen stable isotopes were measured in whole sagittae of young Pacific sardine ({delta}18Ooto) collected throughout their range in the Mexican Pacific to quantify natural variability, to reconstruct temperature histories, and to infer whether fish mix at a population or subpopulation level. Isotopic values and derived temperature estimates (Toto) of sardine captured simultaneously showed high variability (up to 2.0{per thousand} and 10°C at a given location). Given limited variations in salinity, this implies differences in thermal history and the prevalence of subpopulation-level mixing processes. We tested the null hypothesis of local residence by comparing {delta}18Ooto values with predicted isotopic values on a location-specific basis, and age- and location-specific average sea surface temperatures (SSTs) with derived Toto. Some fish exhibited values outside the local range of predicted oxygen isotope values and SSTs, suggesting that they were not permanent residents. Using an otolith growth model, we show that otolith growth and age differences cannot fully account for the variability in {delta}18Ooto values. The absence of significant differences in {delta}18Ooto values between the Pacific and Gulf indicates that oxygen isotope ratios cannot be used to examine population structure or migration among these regions. However, they can be used to infer mixing within and among subpopulations.

Keywords: Mexico, otolith {delta}18O, Sardinops sagax caeruleus, temperature reconstruction

Received 12 August 2007; accepted 19 December 2007; advance access publication 5 February 2008.


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