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High habitat use plasticity by female olive ridley sea turtles (Lepidochelys olivacea) revealed by stable isotope analysis in multiple tissues

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Abstract

The marine habitat use of olive ridley sea turtles (Lepidochelys olivacea) from northeastern Brazil was analyzed via stable isotope analysis (SIA). Blood (red blood cells and serum), epidermis and scute samples from 46 nesting females were collected for SIA of carbon (δ 13C) and nitrogen (δ 15N) to infer the habitats used at distinct time windows. Such approach is possible because each tissue reflects consumer’s diet at different time scales due to different tissue turnover time. Prey representative of both neritic and oceanic realms was used as endpoints. Differences in the residence time of δ 13C and δ 15N among samples indicated a shift from oceanic feeding grounds to neritic habitats before nesting or effects of prolonged fasting on stable isotope values. However, two individuals seemed to have used neritic feeding habitats for longer timespans before the nesting period. Stable isotope mixing models demonstrated high individual variability, suggesting the variable use of non-breeding grounds. Moreover, serum indicated that olive ridleys might feed during the nesting season, most likely opportunistically on discards from trawl fisheries. Finally, through correlations of stable isotope values among tissues, this study provides equations for the conversion and adequate comparison between values from different tissues. Therefore, the habitats used by olive ridley sea turtles from Brazil are vast, encompassing both oceanic and neritic habitats, where they encounter pelagic longline and trawl fisheries, respectively. The high individual variability in the population results in turtles experiencing distinct and variable threats during their annual cycle.

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Acknowledgements

We acknowledge the TAMAR/ICMBio staff for help with sampling; special thanks to Maria Angela Marcovaldi, Jaqueline Castilhos, Roberto Garcia, Adriano Henrique, Buiú, Ederson Luiz Fonseca, Fabio Lira, Mari Weber, and veterinarians for their support. Authors are also grateful to Agnaldo S. Martins, Eduardo R. Secchi, Paul G. Kinas, Manuel Haimovici, Silvina Botta, and two reviewers for careful reading and insightful suggestions on previous versions of the manuscript. RP received financial support from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES). LB is a research fellow of the Brazilian CNPq, National Council for Scientific and Technological Development (Proc. No. 310550/2015-7). This research is part of the PhD thesis written by RP under the guidance of LB and was authorized under the license number 36852-2 (SISBIO - Sistema de Autorização e Informação em Biodiversidade).

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  1. Laboratório de Aves Aquáticas e Tartarugas Marinhas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Avenida Itália s/n, CP 474, Rio Grande, RS, 96203-900, Brazil

    Roberta Petitet & Leandro Bugoni

  2. Programa de Pós-Graduação em Oceanografia Biológica, Instituto de Oceanografia, Universidade Federal do Rio Grande (FURG), Campus Carreiros, Avenida Itália s/n, CP 474, Rio Grande, RS, 96203-900, Brazil

    Roberta Petitet

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Correspondence to Roberta Petitet.

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R. Petitet received financial support from the ‘Coordenação de Aperfeiçoamento de Pessoal de Nível Superior—CAPES’ (Ministry of Education). L. Bugoni received a Research Fellowship from CNPq (PQ 310550/2015-7). This research is part of the PhD thesis written by R.P. under the guidance of L.B. and was authorized under the license number 36852-2 (SISBIO - Sistema de Autorização e Informação em Biodiversidade).

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This article does not contain any studies with human participants. All applicable international, national, and institutional guidelines for the care of animals found stranded alive were followed. We did not conduct experiments with animals.

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Petitet, R., Bugoni, L. High habitat use plasticity by female olive ridley sea turtles (Lepidochelys olivacea) revealed by stable isotope analysis in multiple tissues. Mar Biol 164, 134 (2017). https://doi.org/10.1007/s00227-017-3163-4

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  • DOI: https://doi.org/10.1007/s00227-017-3163-4

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