Calcium provision to oviparous and viviparous embryos of the reproductively bimodal lizard Lacerta (Zootoca) vivipara
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منابع مشابه
Calcium provision to oviparous and viviparous embryos of the reproductively bimodal lizard Lacerta (Zootoca) vivipara.
Embryos of oviparous squamate reptiles typically obtain calcium from both yolk and eggshell but differ from other oviparous amniotes (turtles, birds and crocodilians) because they are heavily dependent on calcium-rich yolk. Eggs of viviparous squamates lack calcareous eggshells, and embryos receive calcium solely from yolk or from both yolk and placenta. The pattern of calcium mobilization by a...
متن کاملEx utero culture of viviparous embryos of the lizard, Zootoca vivipara, provides insights into calcium homeostasis during development.
The chorioallantoic membrane resides adjacent to either the inner surface of the egg shell or uterine epithelium in oviparous and viviparous reptiles, respectively. Chorionic cells face the shell or uterine epithelium and transport calcium to underlying embryonic capillaries. Calcium transport activity of the chorioallantois increases in the final stages of development coincident with rapid emb...
متن کاملComparison of the cold hardiness capacities of the oviparous and viviparous forms of Lacerta vivipara.
The lizard Lacerta vivipara has allopatric oviparous and viviparous populations. The cold hardiness strategy of L. vivipara has previously been studied in viviparous populations, but never in oviparous ones. The present study reveals that both the oviparous and viviparous individuals of this species are able to survive in a supercooled state at -3 degrees C for at least one week when kept on dr...
متن کاملInfluence of reproductive mode on metabolic costs of reproduction: insight from the bimodal lizard Zootoca vivipara.
Examination of the selective forces behind the transition from oviparity to viviparity in vertebrates must include an understanding of the relative energy costs of the two reproductive modes. However, interspecific comparisons of reproductive mode are confounded by numerous other inherent differences among the species. Therefore, we compared oxygen consumption, as a reflection of energy costs, ...
متن کاملCharacterization and androgenic regulation of major mRNAs coding for epididymal proteins in a lizard (Lacerta vivipara).
During the reproductive period (spring) under the control of testosterone the epididymis of the viviparous lizard secretes a group of major proteins with an approximate Mr of 19,000 named L protein(s). These proteins are recognized by a specific immunoserum and bind to the heads of spermatozoa. During spring, translation in reticulocyte lysate of RNA from secreting epididymis (stage 6) produced...
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ژورنال
عنوان ژورنال: Journal of Experimental Biology
سال: 2009
ISSN: 1477-9145,0022-0949
DOI: 10.1242/jeb.030643