Combining isotopic analysis of bulk-skin and individual amino acids to investigate the trophic position and foraging areas of multiple cetacean species in the western South Atlantic

Genyffer Troina, Philip Riekenberg, Marcel T.J. van der Meer, Silvinia Botta, Frank Dehairs, Eduardo R. Secchi

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6 Citaten (Scopus)

Samenvatting

We investigated the trophic structure and habitat use of ten cetacean species occurring in the oceanic waters of the western South Atlantic using naturally-occurring stable isotopes. We analysed δ15N in individual amino acids (AA) to estimate cetacean trophic position (TP) and to evaluate the spatial differences in baseline δ15N (source AAs). We adjusted cetacean bulk-skin δ13C and δ15N for the effect of trophic level using their estimated TPs, obtaining δ13CAdjusted and δ15NAdjusted, respectively. These values were applied to estimate the overlap in the niche areas of cetacean baseline sources. Our analyses showed spatial segregation between Steno bredanensis and the remaining odontocetes, and the high δ15N in this species reflects its occurrence in neritic waters of the southern region. The highest TPs were observed in Physeter macrocephalus, Stenella attenuata and Globicephala melas, while the lowest TPs were reported for S. longirostris, S. clymene and Orcinus orca. Overall, source AA-δ15N showed similar patterns as those of baseline-δ15N (zooplankton) and were higher in species sampled in the southernmost region of the study area (e.g., Delphinus delphis). Isotopic niche areas estimated using δ13CAdjusted and δ15NAdjusted suggested high overlap in foraging area between S. frontalis and Tursiops truncatus, with the latter occupying a higher TP. Our analyses of δ15N in AAs provide a unique insight into the trophic ecology, forage areas and spatial segregation in resource use among these cetacean populations. Additionally, our work provides AA-δ15N baseline for future studies on the trophic ecology and habitat use of marine organisms in the western South Atlantic.
Originele taal-2English
Artikelnummer111610
TijdschriftEnvironmental Research
Volume201
DOI's
StatusPublished - okt 2021

Bibliografische nota

Funding Information:
Funding This project was funded by Chevron Brazil Upstream Frade Ltda (number CW702315 ); and by BG Group, Brazil. The Brazilian Inter-Ministerial Commission for the Resources of the Sea (CIRM) supplied diesel for the ship for all surveys. The Coordination for the Improvement of Higher Education Personnel ( CAPES ) provided a post-doctoral fellowship ( 88887.314453/2019-00 - PROANTAR) to GCT and the National Council for Technological and Scientific Development ( CNPq ) provided a research fellowship to ERS ( PQ 310597/2018-8 ).

Funding Information:
Funding This project was funded by Chevron Brazil Upstream Frade Ltda (number CW702315); and by BG Group, Brazil. The Brazilian Inter-Ministerial Commission for the Resources of the Sea (CIRM) supplied diesel for the ship for all surveys. The Coordination for the Improvement of Higher Education Personnel (CAPES) provided a post-doctoral fellowship (88887.314453/2019-00 - PROANTAR) to GCT and the National Council for Technological and Scientific Development (CNPq) provided a research fellowship to ERS (PQ 310597/2018-8).We would like to thank the crew of FURG's R/V “Atlântico Sul”, Dr. J. Di Tullio and L. Fidélix, and all students and researchers from Projeto Talude who helped collecting the data at sea. We would also like to thank the editor Dr. Robert Letcher and the three anonymous reviewers for their valuable comments and suggestions. This project was funded by Chevron Brazil Upstream Frade Ltda and by BG Group, Brazil. The Brazilian Inter-Ministerial Commission for the Resources of the Sea (CIRM) supplied diesel for the ship for all surveys. The Coordination for the Improvement of Higher Education Personnel (CAPES) provided a post-doctoral fellowship (88887.314453/2019-00 - PROANTAR) to GCT and access to the Portal de Periódicos. The National Council for Technological and Scientific Development (CNPq) provided a research fellowship to ERS (PQ 310597/2018-8) and to SB (PQ 315365/2020-0). This article was produced in international cooperation and is within the scope of the Capes PrInt Program (public notice 041/2017). This study is a contribution of the Research Group “Ecologia e Conservação da Megafauna Marinha-EcoMega/CNPq” and the Brazilian National Institute of Science and Technology - INCT-Mar COI funded by CNPq (proc. 400551/2014-4) and TRIATLAS Project, which has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 817578. Amino acid data are stored in the Royal Netherlands Institute for Sea Research (NIOZ) database which can be accessed at dataverse.nioz.nl (DOI: 10.4121/14839437).

Funding Information:
We would like to thank the crew of FURG's R/V “Atlântico Sul”, Dr. J. Di Tullio and L. Fidélix, and all students and researchers from Projeto Talude who helped collecting the data at sea. We would also like to thank the editor Dr. Robert Letcher and the three anonymous reviewers for their valuable comments and suggestions. This project was funded by Chevron Brazil Upstream Frade Ltda and by BG Group, Brazil. The Brazilian Inter-Ministerial Commission for the Resources of the Sea (CIRM) supplied diesel for the ship for all surveys. The Coordination for the Improvement of Higher Education Personnel ( CAPES ) provided a post-doctoral fellowship ( 88887.314453/2019-00 - PROANTAR) to GCT and access to the Portal de Periódicos. The National Council for Technological and Scientific Development ( CNPq ) provided a research fellowship to ERS ( PQ 310597/2018-8 ) and to SB ( PQ 315365/2020-0 ). This article was produced in international cooperation and is within the scope of the Capes PrInt Program (public notice 041/2017). This study is a contribution of the Research Group “Ecologia e Conservação da Megafauna Marinha-EcoMega/CNPq” and the Brazilian National Institute of Science and Technology - INCT-Mar COI funded by CNPq (proc. 400551/2014-4 ) and TRIATLAS Project , which has received funding from the European Union's Horizon 2020 research and innovation programme under grant agreement No 817578 . Amino acid data are stored in the Royal Netherlands Institute for Sea Research (NIOZ) database which can be accessed at dataverse.nioz.nl (DOI: 10.4121/14839437 ).

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© 2021 Elsevier Inc.

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Copyright 2021 Elsevier B.V., All rights reserved.

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