Literaturdatenbank
Literaturdatenbank |
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Lawniczak, C. J., & Teece, M. A. (2005). Spatial mobilization of calcium and magnesium from the eggshell of the snapping turtle, chelydra serpentina. Journal of Herpetology, 39(4), 659–664.
Added by: Admin (14 Aug 2008 20:31:53 UTC) |
| Resource type: Journal Article BibTeX citation key: Lawniczak2005 View all bibliographic details  |
Categories: General Keywords: Chelydra, Chelydra serpentina, Chelydridae, Schildkröten = turtles + tortoises, Zeitigung = incubation Creators: Lawniczak, Teece Collection: Journal of Herpetology |
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| Abstract |
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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.
Added by: Admin |