Abstract
Data on the impact of environmental pollution on the homeostasis of sea turtles remains scarce, particularly in the Southern Gulf of Mexico. As many municipalities along the coastline of the Yucatan Peninsula do not rely on a waste treatment plant, these organisms could be particularly vulnerable. We searched for relationships between the presence of organochlorine pesticides (OCP) and the level of several oxidative and pollutant stress indicators of the hawksbill sea turtle (Eretmochelys imbricata) during the 2010 nesting season at Punta Xen (Campeche, Mexico). Of the 30 sampled sea turtles, endosulfans, aldrin related (aldrin, endrin, dieldrin, endrin ketone, endrin aldehyde) and dichlorodiphenyldichloroethylene (DDT) families were detected in 17, 21 and 26, respectively. Significant correlation existed between the size of sea turtles with the concentration of methoxychlor, cholinesterase activity in plasma and heptachlors family, and catalase activity and hexachlorohexane family. Cholinesterase activity in washed erythrocytes and lipid peroxidation were positively correlated with glutathione reductase activity. Antioxidant enzyme actions seem adequate as no lipids damages were correlated with any OCPs. Future studies are necessary to evaluate the effect of OCPs on males of the area due to the significant detection of methoxychlor, which target endocrine functioning and increases its concentration with sea turtles size.
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Acknowledgements
The license (SGPA/DGVS/05470/10) to collect the blood samples of 30 turtles was provided by the Secretaria de Medio Ambiente y Recursos Naturales (SEMARNAT). The authors want to thank the turtle camp Grupo Ecologista Quelonios A.C. officials who aided in the fieldwork at Punta Xen. NT had a fellowship from the Programa de Becas posdoctorales en la Universidad Nacional Autónoma de México (Mexico). Special thanks to the three anonymous reviewers whose comments improved the manuscript.
Funding
This study was funded by CONACyT, FOMIX Campeche through the project “Diagnóstico y propuestas de acción de la contaminación de la zona costera del Estado de Campeche” (grant No. 071749).
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Nelly Tremblay’s present address: Unidad Multidisciplinaria de Docencia e Investigación, Facultad de Ciencias, Universidad Nacional Autónoma de México, Puerto de Abrigo s/n, Sisal, C.P. 97356, Yucatán, Mexico
Alejandro Ortiz Arana’s present address: El Colegio de la Frontera Sur, Avenida Centenario km 5.5, Apartado Postal 424, Chetumal 77014, Quintana Roo, Mexico
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Tremblay, N., Ortíz Arana, A., González Jáuregui, M. et al. Relationship between organochlorine pesticides and stress indicators in hawksbill sea turtle (Eretmochelys imbricata) nesting at Punta Xen (Campeche), Southern Gulf of Mexico. Ecotoxicology 26, 173–183 (2017). https://doi.org/10.1007/s10646-016-1752-5
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DOI: https://doi.org/10.1007/s10646-016-1752-5