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Full Description
Comparative endocrinology is one of the most rapidly developing subdis ciplines within the field of endocrinology, and it is having a significant impact on research at the molecular, cellular, organisma1 and environmental levels. Much of the current ferment in endocrinology is in reproductive endocrinology. The purpose of this volume on hormones and reproduction in fishes, amphibians and reptiles is to summarize our present understandings and to identify important research problems to be addressed in the area of comparative reproductive endocrinology. It was inspired by the gathering at Copper Mountain, Colorado, of eminent endocrine scientists from around the world on the occasion of the Tenth International Symposium on Comparative Endocrinology in July, 1985. While preparing for that meeting, we decided that a special volume on reproductive endocrinology was needed to summarize what is known and to stimulate research in particular directions. Why do we emphasize fishes, amphibians and reptiles? First, knowledge about the reproductive endocrinology of these ectothermic vertebrates can provide a clearer picture of the evolution of reproductive hormones and their effects on target organs. This comparative approach can lead to new theories about the evolution of reproductive control mechanisms. Second, studies concerning the reproductive endocrinology of "lower" vertebrates can result in development of "model systems" for application to studies of birds and mammals. Indeed, information about the patterns of reproductive control in ectothermic vertebrates can tell us which are evolutionarily stable and which are labile.
Contents
1 Hormones and Sexual Differentiation.- 2 Gonadotropin-Releasing Hormones in Fishes.- 3 Role of Gonadotropin-Releasing Hormone in Regulation of Gonadotropin Secretion from Amphibian and Reptilian Pituitaries.- 4 Prolactin and Reproduction.- 5 Regulation of Ovarian Steroidogenesis.- 6 Endocrinology of Vitellogenesis.- 7 Endocrine Control of Oocyte Maturation.- 8 Ovulation: Insights about the Mechanisms Based on a Comparative Approach.- 9 Functional Morphology and Regulation of the Corpus Luteum.- 10 Testicular Function.- 11 Regulation of Male Gonaducts and Sex Accessory Structures.- 12 Sex Steroid Receptors and Non-Receptor Binding Proteins.- 13 Seasonal Reproduction; Patterns and Control.- 14 Thyroid Hormones and Reproduction.- 15 Pineal Involvement in Seasonality of Reproduction.- 16 Stress and Reproduction: Reciprocal Relationships.- 17 Regulation of Reproductive Behaviors.- 18 The Evolution of Viviparity in Fishes, Amphibians and Reptiles: An Endocrine Approach.- 19 Aging of the Neuroendocrine System.- Contributors.- Species Index.
