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Is water uptake by reptilian eggs regulated by physiological processes of embryos or a passive hydraulic response to developmental environments?

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Warner, Daniel A. Moody, Melissa A. Telemeco, Rory S.
Description	Country affiliation: United States Author Affiliation: Warner DA ( Department of Ecology, Evolution and Organismal Biology, Iowa State University, Ames, IA 50011, USA. dwarner@iastate.edu)
Abstract	Moisture availability is critical for successful embryonic development in many organisms. In most oviparous reptiles, for example, water exchange between eggs and the surrounding environment can have substantial fitness consequences, but regulation of this process is unclear. Here, we evaluate whether water uptake by eggs of the lizard Anolis sagrei is regulated by the presence of a live embryo or is a passive hydraulic response to substrate moisture conditions. Many eggs laid in our captive colony were infertile or contained embryos that died during early stages of development, yet these 'dead' eggs continued to gain mass similar to that of 'live' eggs at least during the first half of incubation. Our results suggest that water uptake by eggs is largely a passive hydraulic process during the first half of incubation, but active regulation by embryos may be necessary during latter stages. Maternal effects (e.g., deposition of salts into yolk) could influence this passive process during early incubation.
File Format	HTM / HTML
ISSN	10956433
Issue Number	3
Volume Number	160
e-ISSN	15314332
Journal	Comparative Biochemistry and Physiology Part A: Molecular & Integrative Physiology
Language	English
Publisher	Elsevier
Publisher Date	2011-11-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Physiology Discipline Molecular Biology Embryo, Nonmammalian Physiology Lizards Embryology Ovum Water Animals Metabolism Embryonic Development Environment Female Oviparity Journal Article Research Support, Non-u.s. Gov't Research Support, U.s. Gov't, Non-p.h.s.
Content Type	Text
Resource Type	Article
Subject	Physiology Molecular Biology Biochemistry Aquatic Science Animal Science and Zoology

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Is water uptake by reptilian eggs regulated by physiological processes of embryos or a passive hydraulic response to developmental environments?

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Is water uptake by reptilian eggs regulated by physiological processes of embryos or a passive hydraulic response to developmental environments?