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Sex ratio estimations of loggerhead marine turtle hatchlings by incubation duration and nest temperature at Sirte beaches (Libya)

机译:通过在苏尔特海滩(利比亚)的潜伏期和巢温估算小海龟幼体的性别比

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摘要

Hatchling sex ratios in loggerhead marine turtles (Caretta caretta) were estimated on the beaches near Sirte (Libya), using two methods: incubation duration and nest mean temperature during the middle third of the incubation period. Electronic temperature/humidity loggers were deployed at a total of 13 selected nests at Al-Ghbeba, Al-Thalateen, west of Al-Thalateen, Shash and Al-Arbaeen. The incubation period ranged from 47 to 58 days and average temperature ranged from 29 degrees C to 31.8 degrees C. The maximum temperature during this period increased to between 0.6 degrees C and 3.5 degrees C, while the mean temperature also increased during the middle third of the incubation period compared with the first third and continued to increase during the last third. As expected, this study showed that the temperature in the nest decreased with increasing depth of the nest. The results showed a female-dominated sex ratio at 85.4% on the basis of incubation duration and 70.4% on the basis of mean temperature. These findings support the reported highly female-skewed sex ratios in the Mediterranean and elsewhere.
机译:在苏尔特(利比亚)附近的海滩上,使用两种方法估算了logger海龟(Caretta caretta)的孵化性别比:潜伏期和潜伏期中间三分之一的平均温度。电子温度/湿度记录仪部署在Al-Ghbeba,Al-Thalateen,Al-Thalateen以西,Shash和Al-Arbaeen的总共13个选定的巢中。潜伏期为47至58天,平均温度范围为29摄氏度至31.8摄氏度。在此期间,最高温度升高到0.6摄氏度至3.5摄氏度之间,而平均温度在2020年中旬也有所升高潜伏期与前三分之一相比,并在后三分之一持续增加。不出所料,这项研究表明,巢中的温度随着巢深度的增加而降低。结果显示,以潜伏期为基础,女性占主导地位的性别比为85.4%,以平均温度为基础,该比例为70.4%。这些发现支持了地中海和其他地区据报道的女性偏高的性别比例。

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