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Ontogenetic dietary changes of green turtles (Chelonia mydas) in the temperate southwestern Atlantic

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Abstract

The present study combines esophageal lavage (n = 74), stomach content (n = 52) and stable isotope analysis (n = 126) to understand the ontogenetic dietary shift of green turtles (Chelonia mydas) inhabiting the temperate waters off Uruguay. Based on esophageal and stomach analysis, green turtles in the region start consuming macroalgae soon after recruiting to neritic habitats; however, gelatinous macrozooplankton is still a major component of the diet of neritic juvenile green turtles measuring of less than 45 cm in curved carapace length (CCL). Conversely, turtles larger than 45 cm CCL were predominantly herbivores, with a gradual increase in the occurrence of macroalgae with size. Stable isotope analysis confirmed the dietary pattern revealed by esophageal lavage and stomach contents analysis, and also revealed that most of the green turtles smaller than 50 cm CCL found in Uruguayan waters had moved from Brazil only a few months ago. This conclusion is based on the large differences in the δ15N values of potential prey from southern Brazil and Uruguay and on a strong signal from Brazilian macrophytes in the skin of most green turtles from Uruguay. Turtles larger than 50 cm CCL, conversely, made a more prolonged use of Uruguayan foraging grounds. Furthermore, according to the stable isotope ratios in their skin, some turtles remained year round in Uruguayan coastal waters. The overall evidence indicates that green turtles inhabiting the coastal waters off Uruguay exhibit a rapid, but not abrupt, dietary shift after recruiting to neritic habitats and are best described as omnivores than as pure herbivores, with a relevant role of gelatinous macrozooplankton in their diets. Furthermore, most of the turtles spend only short periods in the area and their primary foraging grounds are in Brazil.

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Acknowledgments

We would like to thank the volunteers and Karumbé members, especially Andrés Estrades, Alejandro Fallabrino, Cecilia Lezama, Natalia Teryda, Virginia Ferrando, Noel Caraccio, Carlos Romero, Alfredo Hargain, Coco Meirana, Luciana Alonso, Virginia Borrat, Juan Manuel Cardozo, Vannessa Massimo, Tatiana Curbelo, Lucía Dominguez and Natalia Viera, for their collaboration in the study and green turtle diet analysis. The authors are really grateful to Elisa Darré who starts with green turtle feeding in her bachelor thesis and realized part of the esophagic lavage samples, Paulo Horta and Alex Garcia for algae collection in Brazil and Fabrizio Scarabino for his collaboration and his help with algae identification. We also thank the support of the Marine Zoology Unit of the Cavanilles Institute of Biodiversity and Evolutionary Biology (University of Valencia), especially to Ohiana Revuelta, Natalia Fraija and Francesc Domenech, and also thank to the Department of Animal Biology of the University of Barcelona in special to Fabiana Sapotitti, Lisette Zenteno, Irene Álvarez de Quevedo and Marcel Clusa. Authors are really grateful to all the persons and institutions that collaborated in the Uruguay marine turtle stranding network: volunteers, local fishermen, government institutions (DINARA and DINAMA), naval prefectures, lifeguard service, rangers, civil organizations (particularly SOCOBIOMA), citizens and tourist. We are really grateful to the two reviewers that help to improve the manuscript. We also acknowledge the financial support from IFAW and Rufford Small Grants to Karumbé members (ML-M and GV-R) and Agencia Nacional de Investigación e Innovación (ANII) to AC. JT is supported by projects CGL2011-30413 of the Spanish Ministry of Economy and Competitiveness and Prometeo II (2015) of the Generalitat Valenciana. This research was conducted under license (No. 200/04, 073/08 and 323/11) from the Fauna Department-Ministry of Cattle, Agriculture and Fishing of Uruguay. CITES permits for export and import of the samples were obtained.

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Vélez-Rubio, G.M., Cardona, L., López-Mendilaharsu, M. et al. Ontogenetic dietary changes of green turtles (Chelonia mydas) in the temperate southwestern Atlantic. Mar Biol 163, 57 (2016). https://doi.org/10.1007/s00227-016-2827-9

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