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1 December 2005 Spatial Mobilization of Calcium and Magnesium from the Eggshell of the Snapping Turtle, Chelydra serpentina
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Abstract

Reptilian eggshells are a potential source of nutrients for developing embryos. Embryonic Snapping Turtles (Chelydra serpentina) used calcium and magnesium from the eggshell during development. This supplemental source of calcium provided more than twice the amount of calcium present in freshly laid egg yolk to developing embryos. Calcium was preferentially mobilized from the sides and bottom of the eggshell. Scanning electron micrographs of eggshells indicated that this preferential use affected the structural integrity of the eggshell, which presumably facilitates pipping. The mass and concentration of calcium in the chorioallantoic membrane increased significantly during later development, suggesting that this membrane plays a critical role in mobilization of calcium during development. This is the first study to demonstrate mobilization of eggshell magnesium by embryonic turtles.

Cynthia J. Lawniczak and Mark A. Teece "Spatial Mobilization of Calcium and Magnesium from the Eggshell of the Snapping Turtle, Chelydra serpentina," Journal of Herpetology 39(4), 659-664, (1 December 2005). https://doi.org/10.1670/60-05N.1
Accepted: 1 July 2005; Published: 1 December 2005
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