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New insights in Southwestern Atlantic Ocean Oegopsid squid distribution based on juvenile green turtle (Chelonia mydas) diet analysis

Marine Biodiversity volume 45, pages 701–709 (2015)Cite this article

Abstract

A total of 52 cephalopod beaks were found in the stomachs and intestines of 17 out of 54 green turtles, Chelonia mydas, stranded on the Uruguayan coast between 2009 and 2013 (frequency of occurrence = 31.5 %). Upper and lower beaks were assigned to at least six Oegopsid species of four different genera, Chiroteuthis, Histioteuthis, Onykia (= Moroteuthis) and Mastigoteuthis. Although the presence of cephalopods in the diet of green turtles has been reported previously, it has been quoted as a sporadic or less important diet category. Our findings suggest that this intake of cephalopods by juvenile green turtles during their oceanic stages may be more common in the Southwestern Atlantic Ocean waters than previously thought. According to our records, two of the six Oegopsid squid species found would have a more extended distribution than previously reported, ranging from circumpolar sub-Antarctic areas to the Brazil-Malvinas confluence zone. We highlight the potential of diet analysis of pelagic predators as a tool to enhance our knowledge of the diversity and distribution of poorly known cephalopod species.

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Acknowledgments

We would like to thank the volunteers and Karumbe members, specially Andrés Estrades, Alejandro Fallabrino, Virginia Ferrando, Daniel González, Luciana Alonso, Virginia Borrat, and Natalia Teryda, for their collaboration in the study and green turtle diet analyses. We also thank the support of the Marine Zoology Unit of the Cavanilles Institute of Biodiversity and Evolutionary Biology (University of Valencia, Spain), specially Ohiana Revuelta, Natalia Fraija and Ana Born. The authors are really grateful to all the persons and institutions that collaborated in the Uruguay marine turtle stranding network: local fishermen, government institutions (DINARA and DINAMA), naval prefectures, lifeguard service, rangers, civil organizations (particularly SOCOBIOMA), citizens and tourist. We also acknowledge the financial support from IFAW and Rufford Small Grants to GVR and Agencia Nacional de Investigación e Innovación (ANII) to A.C. J.T. is supported by projects CGL2011-30413 of the Spanish Ministry of Economy and Competitiveness and Prometeo (UV-CI-12-151) 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.

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Authors and Affiliations

  1. Cavanilles Institute of Biodiversity and Evolutionary Biology, University of Valencia, Aptdo. 22085, 46071, Valencia, Spain

    G. M. Vélez-Rubio, J. Tomás & R. Míguez-Lozano

  2. Karumbé, Av. Rivera 3245, C.P.11600, Montevideo, Uruguay

    G. M. Vélez-Rubio & G. Martinez-Souza

  3. Institute of Marine Research, Department of Life Sciences, University of Coimbra, 3001-401, Coimbra, Portugal

    J. C. Xavier

  4. Programa de Pós-Graduação em Oceanografia Biológica, Universidade Federal do Rio Grande – FURG, CP 474, Rio Grande, RS, Brasil

    G. Martinez-Souza

  5. Área Biodiversidad y Conservación, Museo Nacional de Historia Natural, C.C. 399, C.P. 11000, Montevideo, Uruguay

    A. Carranza

  6. Universidad de la República, Centro Universitario regional Este (CURE) Sede Maldonado, Punta del Este, Uruguay

    A. Carranza

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  1. G. M. Vélez-Rubio
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Correspondence to G. M. Vélez-Rubio.

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Vélez-Rubio, G.M., Tomás, J., Míguez-Lozano, R. et al. New insights in Southwestern Atlantic Ocean Oegopsid squid distribution based on juvenile green turtle (Chelonia mydas) diet analysis. Mar Biodiv 45, 701–709 (2015). https://doi.org/10.1007/s12526-014-0272-x

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Keywords

  • Oegopsida
  • Cephalopoda
  • Distribution
  • Chelonia mydas
  • Diet
  • Uruguay