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首页> 外文期刊>Canadian Journal of Zoology >Validation of incubation duration as an index of the sex ratio ofhatchling sea turtles
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Validation of incubation duration as an index of the sex ratio ofhatchling sea turtles

机译：验证孵化时间作为孵化海龟性别比的指标

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摘要

One method of estimating the sex ratio of hatchling sea turtles is to use the incubation duration. Long and short durations imply low and high temperatures, respectively. In turtle species whose sex is determined by temperature, males are produced at low temperatures and females at high temperatures. This study assesses the validity of using incubation duration to estimate the sex ratio. Samples of hatchling loggerhead turtles (Caretta caretta) were collected from nests with known incubation durations, and sex was ascertained by means of histology. The sex ratio of groups of nests determined by histology was compared with that predicted from previous relationships between incubation duration and sex ratio. For conditions causing relatively long or relatively short incubation durations, the sex ratio could be predicted with considerable accuracy. For conditions causing durations nearer to the pivotal duration (that which gives 50% of each sex), predictions could be off by 10%, depending on the distribution of incubation durations, but it was still possible to determine whether ratios were highly skewed or approximately balanced. Estimating sex ratios of hatchling sea turtles from incubation durations is simple, cheap, and can be used retrospectively.
机译：估算孵化海龟性别比例的一种方法是使用孵化持续时间。持续时间长和时间短分别意味着低温和高温。在性别由温度决定的乌龟物种中，雄性在低温下繁殖，雌性在高温下繁殖。这项研究评估使用潜伏期估计性别比例的有效性。从已知孵化时间的巢中采集孵化的logger龟（Caretta caretta）的样本，并通过组织学确定性别。将通过组织学确定的巢组的性别比与根据孵化时间和性别比以前的关系所预测的性别比进行比较。对于引起相对较长或相对较短的潜伏期的条件，可以相当准确地预测性别比。对于导致持续时间更接近关键持续时间的情况（每种性别占50％），根据潜伏期的分布，预测可能会偏离10％，但仍然有可能确定比率是高度偏斜还是近似偏斜均衡。从潜伏期估算出孵化海龟的性别比很简单，便宜，并且可以追溯使用。

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