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2024-07

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cc-by (c) Rita, Diego et al., 2024
Si us plau utilitzeu sempre aquest identificador per citar o enllaçar aquest document: https://hdl.handle.net/2445/219704

Amino acid-specific nitrogen stable isotope analysis reveals the trophic behavior of Icelandic fin whales in winter and suggests variable feeding strategies

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https://doi.org/10.1111/mms.13097

Resum

Fin whales (Balaenoptera physalus) aggregate west of Iceland during summer, where they feed mostly on krill, but their winter distribution is poorly known. This study investigates the winter behavior of fin whales that summer off Iceland by analyzing amino acid-specific nitrogen isotope ratios in the baleen plates. This technique is increasingly used in large marine vertebrates to discriminate between changes in trophic position and changes in isotopic baseline levels, while ruling out the effect of fasting on these patterns. Analyses were conducted on samples extracted from two baleen plate segments: one corresponding to winter, another to summer. The trophic position was higher and slightly more variable in winter (3.6 ± 0.7) than in summer (3.0 ± 0.4), which indicates that during winter fin whales tend to feed on fish and are more generalist in feeding habits. Interestingly, the δ15NPhe values were not lower in winter than in summer (winter: 5.2‰ ± 2.4‰; summer: 4.0‰ ± 2.1‰). This was unexpected because baseline δ15N values (e.g., zooplankton) tend to be lower at low latitudes, where fin whales are believed to spend the winter. Fin whales may remain in relatively high latitudes during winter or visit low-latitude areas with locally higher than average δ15N values, such as upwelling areas.

Matèries

Migració d'animals, Islàndia, Aminoàcids, Rorquals, Isòtops estables en ecologia

Matèries (anglès)

Animal migration, Iceland, Amino acids, Balaenoptera, Stable isotopes in ecological research

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Articles publicats en revistes (Biologia Evolutiva, Ecologia i Ciències Ambientals)
Articles publicats en revistes (Institut de Recerca de la Biodiversitat (IRBio))

Citació

RITA, Diego, et al. Amino acid-specific nitrogen stable isotope analysis reveals the trophic behavior of Icelandic fin whales in winter and suggests variable feeding strategies. Marine Mammal Science. 2024. Vol. 40, núm. 3, pàgs. 1-14. ISSN 0824-0469. [consulta: 8 de maig de 2026]. Disponible a: https://hdl.handle.net/2445/219704

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