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Resumen del producto

Rodriguez-Rafael, E.D., F.R., Elorriaga-Verplancken, A.B., Enríquez-García, M.I., Rodríguez-Martínez, R.A., Cruz-Vallejo, X.G., Moreno-Sánchez, R., Moncayo-Estrada, A., Tripp-Valdez & F., Galván-Magaña (2024). Effects of warm oceanographic anomalies on the foraging variabilityof northern elephant seals. Marine Biology. 171: 162. DOI: 10.1007/s00227-024-04476-5.

Effects of warm oceanographic anomalies on the foraging variabilityof northern elephant seals

Eunices D. Rodriguez-Rafael 1, Fernando Ricardo Elorriaga-Verplancken 2, Arturo Bell Enríquez-García 1, María Isabel Rodríguez-Martínez 1, Romyna Arysbeth Cruz-Vallejo 1, Xchel Gabriel Moreno-Sánchez 2, Rodrigo Moncayo-Estrada 2, Arturo Tripp-Valdez 2 y Felipe Galván-Magaña 2

1 CICIMAR IPN
2 Instituto Politécnico Nacional, Centro Interdisciplinario de Ciencias Marinas, CICIMAR IPN
Evaluation of stable carbon (d13C) and nitrogen (d15N) isotopes in marine organisms over time addresses how environmentalvariability (e.g., El Niño or The Blob) affects habitat use and food resources, respectively. This work focuses on the impact ofwarm events in the Northeastern Pacific Ocean on the foraging strategies of adult female northern elephant seals (Miroungaangustirostris; NES) from the San Benito Archipelago in Mexico during their post-molting migration, through isotopic variabilityin pups as maternal indicators. Analysis of d15N and d13C was carried out on lanugo samples (n = 311) of weaned pupsfrom the 2013–2017, 2019, and 2022–2023 breeding seasons and correlations with sea surface temperature (SST) anomaliesof the potential foraging areas of female NES from the San Benito Archipelago were investigated. Isotopic niches showedhigh overlap throughout most of the study period, suggesting a limited impact of SST anomalies on their foraging strategies.However, values of d15N and d13C differed in 2014, 2018, and 2021 relative to other years, suggesting shifts to distant regionsin latitude and longitude, and increased foraging effort during the post-molting migrations of these warm years. Findingsdemonstrate the flexibility and adaptive capacity of female NES relative to the warm events of the last decade.

Palabras clave: sea surface temperature anomalies; stable isotopes; Pinnipeds; Foraging strategies; Environmental variability

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