Abstract
Many marine fisheries rely on production and energy flow in the pelagic zone; thus, sustainable management of exploited pelagic fishes benefits from insight into temporal, spatial, and ontogenetic variability in the trophic ecology of these species. Here, we analyze stomach contents and stable isotopes to reveal spatial variability (focusing on two fishing grounds, north and south of an oceanographic barrier in the Pacific Ocean) and ontogenetic changes (contrasting immature and mature) in Southern Ray’s Bream (Brama australis) diet composition in Chilean waters. Stomach contents analysis indicated that euphausiids were predominant components of the diet in both fishing grounds and ontogenetic stages. Patterns of prey long-term assimilation, revealed in Bayesian mixing models of predator and prey isotopic values of δ15N and δ13C, differed from diet as indicated in stomach contents. Shrimps and crustacean larvae were more important than euphausiids in the northern and southern fishing ground, respectively. In both fishing grounds, diet shifted after maturity towards increased use of shrimps. Combining methods of stomach contents analysis and stable isotopes analysis is a powerful approach to determining predator–prey relationships and energy flow in pelagic fishes.
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Data availability
The datasets generated during and/or analyzed during the current study are available from the corresponding author on reasonable request.
This project had all the fishing certificates to capture and operate in the waters of the Chilean territory.
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Acknowledgements
Our special gratitude goes to the fishermen who provided the samples and the colleagues who helped opening stomachs: Consuelo Salas and Diego Riquelme.
Funding
The Fisheries Research Fund FIPA funded this work with the Project FIPA 2015–20 Update of the life history parameters of the “bream” (Brama australis) in Chilean waters (link: http://www.subpesca.cl/fipa/613/w3-propertyname-681.html).
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All authors contributed to the study conception and design. Material preparation, data collection, and analysis were performed by Sebastian A Klarian, Maria Francisca Hernandez, Monica Barros, and Juan Antonio Valdes. The first draft of the manuscript was written by Sebastian A. Klarian, Eric T. Schultz, and Hugo Arancibia, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Klarian, S.A., Schultz, E.T., Hernández, M.F. et al. Stomach contents and stable isotope analysis reveal ontogenetic shifts and spatial variability in Brama australis diet. Environ Biol Fish 105, 1673–1682 (2022). https://doi.org/10.1007/s10641-022-01365-y
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DOI: https://doi.org/10.1007/s10641-022-01365-y