EFFECTS OF INCUBATION TEMPERATURE ON SEX DETERMINATION IN A COMMUNITY OF NEOTROPICAL FRESHWATER TURTLES IN SOUTHERN MEXICO
EFFECTS OF INCUBATION TEMPERATURE ON SEX DETERMINATION IN A COMMUNITY OF NEOTROPICAL FRESHWATER TURTLES IN SOUTHERN MEXICO
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孵化温度对墨西哥南部新热带淡水龟群落性别决定的影响
DOI：
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发表时间：
1992
期刊：
影响因子：
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通讯作者：
O. Flores
中科院分区：
文献类型：
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作者：
R. Vogt;O. Flores
孵化温度已被证明可以控制海龟的性别决定（TSD），包括淡水，陆地和海龟。本研究结合了四个新热带特有种（Dermatemys mawii，Staurotypus triporcatus，Claudius angustatus和Kinosternon leucostomum）和两个温带起源（Chelydra serpentina和Trachemys scripta）的现场和实验室数据。研究了在自然巢和控制的实验室温度下孵化的幼体的性别。自然种群中的成年性别比是通过标记和重捕获研究确定的。Staurotypus和Claudius似乎有遗传性别决定（GSD），而TSD发生在其他四个物种。Trachemys和Chelydra的阈值温度低于这些新热带种群比温带气候中的研究。与TSD物种的自然种群被发现有可变的成年性别比，偏向一个性别或其他。这些性别比例的变化有时可以用巢址生态学来解释。
Incubation temperature has been shown to control sex determination (TSD) in both suborders of living turtles, including freshwater, terrestrial, and sea turtles. This study combines field and laboratory data from four neotropical endemic species (Dermatemys mawii, Staurotypus triporcatus, Claudius angustatus, and Kinosternon leucostomum) and two of temperate zone origin (Chelydra serpentina and Trachemys scripta). The sex of hatchlings incubated in natural nests and controlled laboratory temperatures was studied. Adult sex ratios in natural populations were determined by mark and recapture studies. Staurotypus and Claudius appear to have genetic sex determination (GSD) while TSD occurred in the other four species. Threshold temperatures of both Trachemys and Chelydra were lower in these Neotropical populations than in those studied in Temperate Zone climates. Natural populations of species with TSD were found to have variable adult sex ratios, skewed towards one sex or the other. These variations in sex ratio could sometimes be explained by nest site ecology.