Abstract
The cape petrel (Daption capense) is an abundant procellariform in seabird assemblages attending fishing vessels in the Southwestern Atlantic Ocean. The bulk of extant information comes from surveys conducted during the breeding season at Antarctic and sub-Antarctic sites; however, most of their ecological aspects during the non-breeding season remain largely unknown. We performed on-board census and stable isotope analysis in blood and feathers from 30 adult petrels during the non-breeding season in waters off Argentina. Cape petrels attending ice trawlers showed a higher abundance during winter compared to other seasons. The lack of correlation of isotopic values between tissues suggests changes in the diet and foraging locations between the moulting period and the non-breeding season. Isotopic mixing models revealed low-trophic-level sources as the main contributors to this petrel’s diet while pelagic-demersal fish species targeted by fishing vessels showed the lower contribution. The discrepancies between methods could be a result of partial use of offal/discards or low use of these due to size/mechanic limitations. These findings reinforce the idea of zooplankton and small-pelagic fish facilitation during the hauling operatory and the relevance of combining different methods for a thorough understanding of prey-predator relationships.
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Data availability
The data that support the findings of this study are not openly available due to reasons of sensitivity and are available from the corresponding author upon reasonable request. Data are located in controlled access data storage at Instituto de Investigaciones Marinas y Costeras, IIMyC (UNMdP-CONICET).
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Acknowledgements
We gratefully acknowledge the captain and the crew of the fishing vessel ‘Ur-ertza’ and Lic. Gabriel Blanco from the National Observers Program (INIDEP) for facilitating the vessel access. P. Lértora, J.P. Romanelli, and observers of the National Observers Program (INIDEP) for helping during sampling potential prey. We appreciate four anonymous reviewers and the editor for their suggestions and comments that hugely improved the manuscript.
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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, PICT 2008-0590 and PICT 2017-1761), the National Research Council (PIP CONICET 00070), and the National University of Mar del Plata (Argentina).
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RMJ and MF designed the study. SC and JPSP participated in the field studies. RMJ and JPSP analysed the data. RMJ produced the first draft of the paper, to which all other authors contributed.
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300_2023_3144_MOESM1_ESM.eps
ESM 1 Simulated mixing regions for the biplots in Fig 2. (a) Antarctic subset, (b) Patagonic subset. Probability contours are at the 5% level (outermost contour) and at every 10% level. The positions of individual cape petrels (solid circles) and the average source values (crosses) are shown (EPS 1051 KB)
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Mariano-Jelicich, R., Seco Pon, J.P., Copello, S. et al. Distribution and diet of cape petrels (Daption capense) attending fishing vessels off the Patagonian Continental Shelf during the non-breeding season in austral winter: insights from on-board censuses and stable isotope analysis. Polar Biol 46, 559–571 (2023). https://doi.org/10.1007/s00300-023-03144-6
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DOI: https://doi.org/10.1007/s00300-023-03144-6