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Marine Ecology Progress Series

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MEPS 646:109-125 (2020)  -  DOI: https://doi.org/10.3354/meps13394

The role of extrinsic variation—cohabiting juvenile fish species exhibit similar otolith elemental signatures

Leticia Maria Cavole1,*, Jessica A. Miller2, Pelayo Salinas-de-León3,4, Octavio Aburto-Oropeza1, Jose R. Marin Jarrin3,5, Andrew Frederick Johnson1,6,7

1Scripps Institution of Oceanography, University of California San Diego, 9500 Gilman Drive, La Jolla, CA 92093, USA
2Oregon State University, 2030 SE Marine Science Drive, Newport, OR 97365, USA
3Charles Darwin Research Station, Charles Darwin Foundation, Puerto Ayora 200350, Galapagos Islands, Ecuador
4Pristine Seas, National Geographic Society, Washington, DC, 20036, USA
5Department of Fisheries Biology, Humboldt State University, 1 Harpst St, Arcata, CA 95521, USA
6MarFishEco Fisheries Consultants, Llanforda Mead, Oswestry, Shropshire SY11 1TS, UK
7The Lyell Centre, Institute of Life and Earth Sciences, School of Energy, Geoscience, Infrastructure and Society, Heriot-Watt University, Edinburgh EH14 4AS, UK
*Corresponding author:

ABSTRACT: The effect of extrinsic (environmentally based) and intrinsic (physiologically based) controls on otolith elemental signatures remains poorly understood. We evaluated the relative importance of both extrinsic and intrinsic factors using juvenile fish in Eastern Tropical Pacific (ETP) mangroves. To assess extrinsic influences, we compared the cohabiting yellow snapper Lutjanus argentiventris and sailfin grouper Mycteroperca olfax from the Galápagos Archipelago. To evaluate intrinsic influences, we compared yellow snapper from the Gulf of California (Mexico) and the Galápagos Archipelago (Ecuador). The 2 cohabiting species in the Galápagos exhibited very similar otolith elemental signatures, with no significant differences observed for Li, Cu, Mg, Mn, Rb, and Sr (univariate ANOVAs, p > 0.05), and a small separation achieved between these species (ANOSIM test, R = 0.01, p = 0.038). The yellow snappers from Galápagos and the Gulf of California exhibited distinct elemental signatures increasing from Rb, Cu, Mn, Sr, Li to Ba (univariate ANOVAs, p < 0.05), with a large separation between them (ANOSIM test, R = 0.55, p = 0.001). The present study suggests that extrinsic factors (e.g. water chemistry, temperature, salinity) can be more important than intrinsic factors (e.g. physiology, growth rates, genetics) for influencing elemental uptake in the otoliths of juveniles from mangrove waters. However, improved understanding of factors influencing elemental incorporation is still needed to ensure accurate interpretation of field data, especially in dynamic oceanographic systems, which is the case for both the Gulf of California and the Galápagos Archipelago.


KEY WORDS: Environmental effect · Otolith microchemistry · Mangrove · Lutjanus argentiventris · Mycteroperca olfax · Vital effect · Eastern Tropical Pacific · ETP


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Cite this article as: Cavole LM, Miller JA, Salinas-de-León P, Aburto-Oropeza O, Marin Jarrin JR, Johnson AF (2020) The role of extrinsic variation—cohabiting juvenile fish species exhibit similar otolith elemental signatures. Mar Ecol Prog Ser 646:109-125. https://doi.org/10.3354/meps13394

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