Sources of calcium for embryonic development in eggs of the snapping turtle Chelydra serpentina
Sources of calcium for embryonic development in eggs of the snapping turtle Chelydra serpentina
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鳄龟卵胚胎发育的钙来源
DOI：
10.1002/jez.1402300111
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发表时间：
1984
影响因子：
--
通讯作者：
T. Gorell
中科院分区：
文献类型：
--
作者：
M. Packard;T. Short;G. C. Packard;T. Gorell
对鳄龟（Chelydra serpentina）软壳蛋在孵化不同时间的钙含量进行分析，以确定发育胚胎的矿物质来源并表征其动员模式。新鲜鸡蛋的蛋黄和蛋白分别含有 11.70 毫克和 0.16 毫克钙。在孵化过程中，几乎所有的钙都从蛋黄中排出，但这些钙不足以满足胚胎的需要。由于钙质蛋壳中约 15 毫克的钙被调动，从产卵到孵化期间，蛋内的钙含量增加至 27 毫克。因此，鳄龟胚胎从蛋壳中获得略多于一半（56%）的发育所需钙，其余部分（44%）来自产卵时蛋黄中的钙储备。
Flexible-shelled eggs of snapping turtles (Chelydra serpentina) were analyzed for calcium content at different times in incubation to determine sources of mineral for developing embryos and to characterize the pattern of its mobilization. Yolk and albumen of freshly laid eggs contained 11.70 and 0.16 mg of calcium, respectively. Almost all calcium was withdrawn from the yolk during incubation, but this calcium was not sufficient to satisfy requirements of embryos. Calcium contained within eggs increased to 27 mg between oviposition and hatching owing to mobilization of approximately 15 mg of calcium from the calcareous eggshell. Thus, embryonic snapping turtles obtain slightly more than half (56%) of the calcium required for development from the eggshell, with the remainder (44%) coming from stores present in the yolk at oviposition.