Sex Ratio of Green Turtle (Chelonia mydas) Hatchlings at Sugözü, Turkey: Higher Accuracy with Pivotal Incubation Duration

IF 0.8 4区生物学 Q3 ZOOLOGY

Chelonian Conservation and Biology Pub Date : 2016-06-08 DOI:10.2744/CCB-1132.1

O. Candan, D. Kolankaya

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引用次数: 18

Abstract

Abstract The majority of green turtle (Chelonia mydas) nests in the Mediterranean basin are found on the eastern Mediterranean beaches of Turkey. There are relatively few studies on the sex ratio of green turtle hatchlings for Turkey. In this study, 12 nests on the Sugözü beaches were equipped with temperature data-loggers during the nesting seasons of 2008 and 2009. Temperatures for the entire incubation period and for the middle third were close to the pivotal temperature around 29.0°C. The average incubation duration for nests with known temperature was 52.8 d. An assessment of incubation durations together with histological analysis of 188 gonad samples collected from 103 nests revealed a pivotal incubation duration of 54.3 d and constant temperature equivalent conversion revealed 54 d. This value was identified for the first time for green turtles on the beaches of the eastern Mediterranean in Turkey based on 196 nests with known incubation duration; these nests showed a female-biased sex ratio in 2008 and 2009 (with 54.9% and 56.5%, respectively). Using incubation duration can increase sample size and therefore accuracy of sex ratio predictions without any hatchling sacrifice.

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土耳其Sugözü绿海龟(Chelonia mydas)幼龟的性别比例:关键孵化时间的准确性更高

地中海盆地的绿海龟(Chelonia mydas)巢大多数位于土耳其的地中海东部海滩。关于土耳其绿海龟幼龟性别比的研究相对较少。在这项研究中，在2008年和2009年的筑巢季节，Sugözü海滩上的12个巢配备了温度数据记录器。整个孵化期和中间三分之一的温度接近29.0℃左右的关键温度。已知温度下的绿海龟巢的平均孵化时间为52.8 d。对103个巢中收集的188个性腺样本进行的孵化时间评估和组织学分析显示，关键孵化时间为54.3 d，恒温等效转换显示为54 d。这一数值首次在土耳其地中海东部海滩上的196个已知孵化时间的绿海龟巢中被确定;这些巢在2008年和2009年表现出雌性偏向的性别比例(分别为54.9%和56.5%)。利用孵化时间可以增加样本量，从而在不牺牲任何幼雏的情况下预测性别比例的准确性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chelonian Conservation and Biology 生物-动物学

CiteScore

1.70

自引率

14.30%

发文量

审稿时长

>12 weeks

期刊介绍： Chelonian Conservation and Biology is a biannual peer-reviewed journal of cosmopolitan and broad-based coverage of all aspects of conservation and biology of all chelonians, including freshwater turtles, marine turtles, and tortoises. Manuscripts may cover any aspects of turtle and tortoise research, with a preference for conservation or biology. Manuscripts dealing with conservation biology, systematic relationships, chelonian diversity, geographic distribution, natural history, ecology, reproduction, morphology and natural variation, population status, husbandry, community conservation initiatives, and human exploitation or conservation management issues are of special interest.