ABSTRACT: Because the sex of all sea turtle hatchlings is determined by incubation temperature, with low temperatures producing mainly males and high temperatures producing mainly females, sea turtle populations worldwide are threatened by feminization of hatchlings due to increases in global temperature. Data obtained by laparoscopic sexing of immature individuals captured from a major feeding ground indicates that over several decades there has been little recruitment of males into the northern Great Barrier Reef (nGBR) green turtle Chelonia mydas population, one of the largest sea turtle populations in the world. Over 2 nesting seasons, we measured nest temperatures at Raine Island, the most important nesting site for this nGBR population, and predicted that almost all nests would have produced all female hatchlings. The few nests that produced some male hatchlings were constructed at the very end of the nesting season, and these nests had the lowest hatching success. Taking into account monthly variations in nest construction, hatching success, and hatchling sex ratio, we estimate that over an entire nesting season only 0.7% of hatchlings produced are male. Hence, we conclude that the nGBR population of green turtles has likely recruited very few males in recent years.

中文翻译：

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世界上最大的绿海龟群雄性繁殖低

摘要：由于所有海龟孵化器的性别均由孵化温度决定，低温主要产生雄性，高温主要产生雌性，全球温度升高导致孵化器女性化威胁了全世界的海龟种群。通过腹腔镜对从一个主要觅食地捕获的未成熟个体进行性别鉴定而获得的数据表明，几十年来，很少有雄性进入北部大堡礁（nGBR）绿海龟Chelonia mydas。人口，世界上最大的海龟种群之一。在两个筑巢季节中，我们测量了莱因岛（该nGBR种群最重要的筑巢地点）的筑巢温度，并预测几乎所有筑巢都会产生所有雌性幼体。在筑巢季节的最后阶段，建造了一些会产生雄性幼体的巢，这些巢的孵化成功率最低。考虑到筑巢结构，孵化成功率和孵化率的每月变化，我们估计在整个筑巢季节中，只有0.7％的孵化率为雄性。因此，我们得出结论，近年来，绿海龟的nGBR种群可能招募了很少的雄性。