Sex ratio estimations of Chelonia mydas hatchlings at Samandag Beach, Turkey

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dc.authoridSonmez, Bektas/0000-0002-8190-409X
dc.authoridYalcin Ozdilek, Sukran/0000-0001-8264-7606
dc.contributor.authorYalçın Özdilek, Şükran
dc.contributor.authorSonmez, Bektas
dc.contributor.authorKaska, Yakup
dc.date.accessioned2025-01-27T20:34:40Z
dc.date.available2025-01-27T20:34:40Z
dc.date.issued2016
dc.departmentÇanakkale Onsekiz Mart Üniversitesi
dc.description.abstractSamandag Beach, an important nesting location for endangered green turtles (Chelonia mydas), is located at the most eastern part of the Mediterranean in Turkey. Hatchling sex ratio can be one of the key factors for green turtle protection, which is under the threat of global climate change. In this study, sex ratios of hatchlings were estimated by histological examination of dead hatchlings (n = 190) and by nest temperatures (n = 14) at Samandag Beach between the 2003 and 2007 nesting seasons. The histological examination of dead C. mydas hatchlings and temperature-recorded nests indicated a female-biased sex ratio on Samandag Beach. By histological examination, top and bottom levels of nests were recorded as 94% and 64% of females. Sex ratios during the middle third of the incubation period ranged from 39% to 97% for females with a mean of 74%. Distance from the sea was correlated with the middle third of incubation temperature (r = -0.604, P = 0.022) and female ratio (r = -0.573, P = 0.032). While nest temperatures and nest parameters such as hatching success, clutch size, nest distance from the sea and from vegetation, nest depth, and the day of emergence were not found significantly different among years (P > 0.05), incubation duration was found significantly different among years (P < 0.05). The results showed a female-dominated sex ratio by both histology and nest temperature. The knowledge of hatchling sex ratios provides information on demographic parameters, and coupled with appropriate conservation measures this can make important contributions to studies of climate change effects on green sea turtle populations.
dc.description.sponsorshipScientific and Technological Research Council of Turkey (TUBITAK) [YDABAG-103Y058, YDABAG-104Y055]
dc.description.sponsorshipWe particularly want to thank the Scientific and Technological Research Council of Turkey (TUBITAK) since this study was partially supported by the projects coded YDABAG-103Y058 and YDABAG-104Y055. We must also express gratitude to the Hatay Environmental and Forestry Directorate. Many thanks also to the hardworking MKU Biology Department volunteer students, to Dr Hasan Goksel Ozdilek for his help in field research, and to lecturer Graham H Lee for proof-reading the text. We thank Dr Graeme Hays and Dr John Rowe for reviewing and giving valuable advice for this manuscript.
dc.identifier.doi10.3906/zoo-1501-17
dc.identifier.endpage560
dc.identifier.issn1300-0179
dc.identifier.issn1303-6114
dc.identifier.issue4
dc.identifier.scopus2-s2.0-84973352671
dc.identifier.scopusqualityQ2
dc.identifier.startpage552
dc.identifier.urihttps://doi.org/10.3906/zoo-1501-17
dc.identifier.urihttps://hdl.handle.net/20.500.12428/23414
dc.identifier.volume40
dc.identifier.wosWOS:000378691500010
dc.identifier.wosqualityQ3
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.language.isoen
dc.publisherTubitak Scientific & Technological Research Council Turkey
dc.relation.ispartofTurkish Journal of Zoology
dc.relation.publicationcategoryinfo:eu-repo/semantics/openAccess
dc.rightsinfo:eu-repo/semantics/openAccess
dc.snmzKA_WoS_20250125
dc.subjectSex ratio
dc.subjectsand temperature
dc.subjectChelonia mydas
dc.subjectgreen turtle
dc.subjectSamandag
dc.titleSex ratio estimations of Chelonia mydas hatchlings at Samandag Beach, Turkey
dc.typeArticle

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