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Long-term changes in Black-browed albatrosses diet as a result of fisheries expansion: an isotopic approach

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Abstract

Ecological changes due to fishing activities appear to be similar across marine ecosystems; in this context the application of retrospective studies could help understand the magnitude of such impact on apex predators. Carbon and nitrogen stable isotopic values of feathers were used to evaluate if the observed expansion in Argentine fisheries operating in the Patagonian Continental Shelf affected Black-browed albatrosses (BBAs) diet. Feather samples from museum skins and from contemporary birds captured at sea were compared. Samples from the “pre-expansion” period showed enriched carbon values compared to recent samples. No differences in δ15N were observed between periods, suggesting that if a diet change occurred it did not affect trophic levels exploited by BBAs. Isotopic niche width of contemporary BBAs was wider than the one for historic albatrosses suggesting, for the former, a more variable diet. Given that cephalopods from the Patagonian Continental Shelf showed enriched carbon values compared to pelagic and demersal prey, our results suggest a trend from a cephalopod-based diet during the pre-fisheries expansion period towards a demersal prey-based diet in a contemporary fishing context. Despite the limitations imposed by retrospective studies, our results show that a shift in the diet of the Black-browed albatross in waters of the Patagonian Continental Shelf could have occurred as a result of ecosystem changes promoted by the expansion of industrial fisheries and mostly through the emergence of discards as an abundant and predictable food source.

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Acknowledgements

We would like to acknowledge the Captain and crew of the fishing vessel “Ur-ertza” and Lic. Gabriel Blanco, Head of the National Observers Program (INIDEP) for logistic support. We gratefully acknowledge Dr. Pablo Tubaro and Dr. Darío Lijtmaer, curator and associated curator, respectively, from the Argentinean Museum of Natural Sciences “Bernardino Rivadavia" that kindly provided samples. We like to thank, as well, to Yolanda E. Davies for logistic support. We also wish to thank Lic. Enrique Madrid for helping during molecular sexing of birds. All sampling was conducted under approved animal-use protocols and complies with current national legislation. Thanks also to three anonymous reviewers for their valuable input that greatly improved the manuscript.

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  1. Grupo Vertebrados, Instituto de Investigaciones Marinas y Costeras (IIMyC), Universidad Nacional de Mar del Plata (UNMdP), Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Funes 3250, B7602AYJ, Mar del Plata, Argentina

    Rocío Mariano-Jelicich, Sofía Copello, Juan Pablo Seco Pon & Marco Favero

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  1. Rocío Mariano-Jelicich
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Correspondence to Rocío Mariano-Jelicich.

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This study was funded by the National Agency for the Promotion of Science and Technology (Agencia Nacional de Promoción Científica y Tecnológica, Argentina, Grants Numbers PICT 2008-0590, PICT 2012-1401), the National Research Council (Consejo Nacional de Investigaciones Científicas y Técnicas, Argentina, Grant Number PIP 00070) and the National University of Mar del Plata (Argentina, Grant Number 15/E238).

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All applicable international, national and/or institutional guidelines for the care and use of animals were followed.

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Mariano-Jelicich, R., Copello, S., Seco Pon, J.P. et al. Long-term changes in Black-browed albatrosses diet as a result of fisheries expansion: an isotopic approach. Mar Biol 164, 148 (2017). https://doi.org/10.1007/s00227-017-3176-z

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