On Gonads and Reproductive Behaviour in the Cichlid Fish Aequidens Portalegrensis (Hensel) PDF Download
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Author: Johan Jan Willem Polder
Publisher: Brill Archive
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
Author: Johan Jan Willem Polder
Publisher: Brill Archive
ISBN:
Category :
Languages : en
Pages : 120
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Book Description
Author: R. Reinboth
Publisher: Springer Science & Business Media
ISBN: 364266069X
Category : Science
Languages : en
Pages : 464
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Book Description
When Richard Goldschmidt' coined the term "intersexuality" in 1915, he intended it to apply to normally dioecious species which exhibit some kind of mixture between male and female characters. However, as knowledge of the bewildering variability present in the sexual orga nization of members of the animal kingdom has increased, the original meaning of the word has changed. Today many authors define inter sexuality as "the presence of both male and female characteristics, or of intermediate sexual characteristics, in a single individual".2 This more extensive and widely accepted concept justifies the title of our book •. Among all the anatomical and physiological features of living organisms the reproductive system has a unique importance for the perpetuation of the species. Conversely, reproductive processes are of little or no account for the viability of the individual. Therefore, within the framework of general biology reproduction has all too often been looked at solely from the point of view of genetics. Lively discussions about genotypic versus phenotypic sex determination long dominated the sci entific literature on sexuality in animals; this one-sided emphasis has tended to obscure many important facets of an organism's ability to reproduce. Recent developments in current biological research have brought the classic problem of sex differentiation into focus again, and the rapid progress being made in comparative endocrinology has added a new di mension to the study of reproductive biology.
Author: Ronald G. Oldfield
Publisher:
ISBN:
Category :
Languages : en
Pages : 502
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Book Description
Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 828
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Book Description
Author: Norman T. Adler
Publisher: Springer Science & Business Media
ISBN: 1468448323
Category : Science
Languages : en
Pages : 806
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Book Description
Author: Memorial University of Newfoundland. Marine Sciences Research Laboratory
Publisher: Logy Bay, Nfld. : Marine Sciences Research Laboratory, Memorial University of Newfoundland
ISBN:
Category : Fish culture
Languages : en
Pages : 362
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Book Description
Author: Tetsuo Kuwamura
Publisher: Springer Nature
ISBN: 981196095X
Category : Science
Languages : en
Pages : 256
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Book Description
This book provides a comprehensive review of hermaphroditism in fishes. It focuses on the behavioral ecology of functional hermaphroditism in fishes and discusses its evolution. Approximately 99% of all vertebrate species consist of separate-sex individuals (gonochorists), i.e., pure males and pure females. The other 1% of vertebrate species are hermaphroditic, and almost all of them are fishes. Among hermaphroditic fishes, four major types of hermaphroditism are known: simultaneous (or synchronous) hermaphroditism, protandry (male-to-female sex change), protogyny (female-to-male sex change), and bidirectional sex change (or reversed sex change in protogynous species). The book examines the occurrence of hermaphroditism in relation to phylogeny and mating systems. It also reviews the hypotheses for the evolution of hermaphroditism, and the size-advantage model, which is the main theory for the evolution of sex change, tested in relation to the mating system. The appendix in the last chapter provides an annotated list of hermaphroditic fish species (ca. 500 spp.).
Author: Angus D. Munro
Publisher: CRC Press
ISBN: 1000722457
Category : Science
Languages : en
Pages : 270
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Book Description
This important publication provides, for the first time, a comprehensive review of knowledge of reproductive seasonality in teleosts. It addresses why a particular species should show such seasonality, and how environmental cues act as regulators to ensure that reproductive maturation and breeding occur at the optimum time. The book considers the ultimate factors responsible for the evolution of reproductive seasonality in fish. It reviews salient concepts of reproductive seasonality in mammals. This volume also includes a review of accumulated knowledge of the control mechanisms of salmonids, gasterosteids, temperate cyprinids, cyprinodonts and other brackish-water forms, and marine and tropical freshwater teleosts. This is a work of value to research scientists in the field of environmental physiology, reproductive biology, and comparative neuroendocrinology and endocrinology. In addition, it is relevant for institutions involved with aquaculture and fisheries management. It is useful for post-graduate as well as undergraduate courses in fish biology and various related subjects.
Author: Arvind N. Shukla
Publisher: Discovery Publishing House
ISBN: 9788183563901
Category : Biological Clock
Languages : en
Pages : 320
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Book Description
Author: Hubert Vaudry
Publisher: Frontiers Media SA
ISBN: 2889450724
Category : Diseases of the endocrine glands. Clinical endocrinology
Languages : en
Pages : 140
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Book Description
Neuroendocrinology is the discipline that investigates the interplay between the nervous and endocrine systems i.e. the control of endocrine glands by the central and peripheral nervous systems, the action of hormones on nerve cells and the production of hormones by the nervous system. The present Research Topic is a compilation of contributions stemming from the 8th International Congress of Neuroendocrinology (ICN2014) held in Sydney, Australia, that illustrates various facets of current neuroendocrine research.
