Temperature variation within and between nests of the green sea turtle, Chelonia mydas (Chelonia: Cheloniidae) on Heron Island, Great Barrier Reef
Temperature variation within and between nests of the green sea turtle, Chelonia mydas (Chelonia: Cheloniidae) on Heron Island, Great Barrier Reef
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DOI：
10.1071/zo00059
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发表时间：
2001-01-01
影响因子：
0.8
通讯作者：
Astill, K
中科院分区：
文献类型：
--
作者：
Booth, DT;Astill, K
在1998-99年产卵季节，在苍鹭岛的五个绿色海龟巢中放置了四个温度数据记录器。由于一般的沙子加热和增加代谢产热的发育中的胚胎的孵化进展，在所有巢的温度增加。即使在巢顶，温度也没有明显的日变化。在孵化的最后三分之一期间，巢中间的蛋的温度高于巢外围的蛋的温度。然而，这种代谢巢加热对孵化的性别比影响不大，因为它发生在性别决定期之后。在整个孵化过程中，巢内不同区域之间的温度差异很小，这可能对确保巢内至少有一些异性个体的生产很重要，这些个体的温度接近于全雄或全雌的决定温度。位置和程度的阴影的巢平均巢温的影响不大，但较深的巢一般凉爽，因此预测产生较高比例的男性比浅巢。巢温剖面数据表明，1998-99年的苍鹭岛筑巢季节会产生强烈的女性偏见的性别比例之间的孵化。
Four temperature data-loggers were placed in each of five green sea turtle nests on Heron Island in the 1998-99 nesting season. Temperatures in all nests increased as incubation progressed due to general sand heating and increased metabolic heat production of the developing embryos. Even at the top of nests no daily diurnal fluctuation in temperature was evident. The temperature of eggs in the middle of the nest increased above those in the nest periphery during the last third of incubation. However, this metabolic nest heating would have little effect on hatchling sex ratio because it occurred after the sex-determining period. Small differences in temperature between regions of a nest persisted throughout incubation and may be important in ensuring the production of at least some individuals of the opposite sex in nests that have temperatures close to either the all-male or all-female determining temperatures. Location and degree of shading of nests had little effect on mean nest temperature, but deeper nests were generally cooler and therefore were predicted to produce a higher proportion of males than were shallower nests. Nest temperature profile data indicated that the 1998-99 nesting season on Heron Island would have produced a strongly female-biased sex ratio amongst hatchlings.