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Calcium mobilization, water balance, and growth in embryos of the agamid lizard Amphibolurus barbatus
Citation
Packard, MJ and Packard, GC and Miller, JD and Jones, ME and Gutzke, WHN, Calcium mobilization, water balance, and growth in embryos of the agamid lizard Amphibolurus barbatus, Journal of Experimental Zoology, 235, (3) pp. 349-357. ISSN 0022-104X (2018) [Refereed Article]
DOI: doi:10.1002/jez.1402350306
Abstract
Embryos of the agamid lizard Amphibolurus barbatus are at developmental stage 29 of Dufaure and Hubert at the time of oviposition. Mobilization of calcium and other nutrients from the yolk proceeds slowly for the first half of incubation, during which time embryonic growth also proceeds slowly. During the second half of incubation, however, embryos withdraw calcium and other nutrients from the yolk very rapidly, and growth rates are correspondingly high. Approximately 60% of the calcium used by developing embryos is obtained from the yolk, but fully 40% of their requirement is met by calcium mobilized from the eggshell. Very little calcium remains in residual yolk of hatchlings, so this yolk must be used in maintenance metabolism rather than in growth of neonates. No dichotomy exists among oviparous, amniotic vertebrates with respect to sources of calcium used by developing embryos, but one does exist with respect to patterns of mobilization of this element. Whereas calcium is extracted from yolk of embryonic reptiles throughout incubation, it actually is deposited in yolk of embryonic birds after the midpoint in development.
Item Details
Item Type: | Refereed Article |
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Keywords: | calcium, embryo, yolk, nutrient, growth, lizard, agamid, Amphibolurus barbatus |
Research Division: | Biological Sciences |
Research Group: | Zoology |
Research Field: | Animal developmental and reproductive biology |
Objective Division: | Expanding Knowledge |
Objective Group: | Expanding knowledge |
Objective Field: | Expanding knowledge in the biological sciences |
UTAS Author: | Jones, ME (Professor Menna Jones) |
ID Code: | 130835 |
Year Published: | 2018 |
Web of Science® Times Cited: | 62 |
Deposited By: | Zoology |
Deposited On: | 2019-02-15 |
Last Modified: | 2019-02-15 |
Downloads: | 0 |
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