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Maternal-Fetal Trophic and Respiratory Relationships in Viviparous Ectothermic Vertebrates

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Advances in Comparative and Environmental Physiology

Part of the book series: Advances in Comparative and Environmental Physiology ((COMPARATIVE,volume 5))

Abstract

Viviparity in ectothermic vertebrates may be defined in different ways. For the present purpose we may conveniently use Wourm’s (1981) definition, viz., that viviparity is “a process in which eggs are fertilized internally and are retained within the maternal reproductive system for a significant period of time during which they develop to an advanced state and then are released”. The maternal organism accordingly must provide the developing embryo with those materials that it otherwise obtains from its physical surroundings to satisfy its trophic and respiratory requirements.

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  1. R. E. Weber

    Present address: Zoophysiology Laboratory, Aarhus University, 8000, Aarhus C, Denmark

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Korsgaard, B., Weber, R.E. (1989). Maternal-Fetal Trophic and Respiratory Relationships in Viviparous Ectothermic Vertebrates. In: Advances in Comparative and Environmental Physiology. Advances in Comparative and Environmental Physiology, vol 5. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-74510-2_7

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