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Resumen del producto

Symon, T.E., D.A., Murillo-Cisneros, C.J., Hernández-Camacho, T.M., O´Hara, R.J., Taylor, C.A., Rosado-Berrios, J.P., Vázquez-Medina & T., Zenteno-Savín (2023). Mercury and selenium concentrations in lanugo of free-ranging California sea lions in the southern Gulf of California, Mexico. Marine Pollution Bulletin. 197: 115712. DOI: 10.1016/j.marpolbul.2023.115712.

Mercury and selenium concentrations in lanugo of free-ranging California sea lions in the southern Gulf of California, Mexico

Taryn E. Symon 1, Daniela A. Murillo-Cisneros 1, Claudia Janetl Hernández-Camacho 2, Tom M. O´Hara 3, R.J. Taylor 3, C.A. Rosado-Berrios 3, J.P. Vázquez-Medina 4 y T. Zenteno-Savín 1

1 Centro de Investigaciones Biológicas del Noroeste
2 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas
3 School of Veterinary Medicine and Biomedical Scienciess, Texas A&M University, College Station 77843, United States of America
4 Department of Integrative Biology, University of California, Berkeley, 94720 Berkeley, United States of America
Total mercury ([THg]) and selenium ([TSe]) concentrations were determined in California sea lion (Zalophus californianus) lanugo from the Gulf of California in 2021 and 2022. Relationships with sex, morphometrics, and year were evaluated. Following toxicological thresholds of concern for piscivorous mammals, most pups had a [THg] < 10 ppm, one pup (2021) had a [THg] > 20 ppm, no pups had a [THg] > 30 ppm. Females had significantly higher [TSe] than males; sex did not influence [THg]. [THg] and [TSe] in 2022 were significantly higher in the general population and male cohorts compared to 2021. Significant negative correlations were observed between [THg], [TSe], and morphometrics (2021). These results indicate that, compared to other pinniped species, regional California sea lions may have a decreased likelihood of experiencing Hg-related adverse health effects. Year-related changes in element concentrations suggest continued monitoring of this population to assess pinniped, environmental, and potentially, human health.

Palabras clave: Ecotoxicology; Gulf of California; pinniped; Mercury; Selenium; Zalophus californianus

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