Overview

The unprecedented level of diversity recorded among the clones of self-fertilizing gynogenetic unisexuals and self-fertilizing simultaneous hermaphrodites challenges current ideas on the predominant role of recombination in promoting evolution of biological diversity. Though limited to a few species, the existence of self-fertilizing and cyclical sex changing hermaphrodites remians a puzzle to many geneticists and endocrinologists. Within a few days after the removal of a harem master or mistress, a successor changes sex and takes over the harem; the causes for the sex changing mechanism pose many challenges to socio-ecologists and behaviour specialists.This book is a synthesis of relevant and recent information on sexuality of fishes and points towards new directions of desired research.

Full Product Details

Author:   T. J. Pandian
Publisher:   Taylor & Francis Inc
Imprint:   Science Publishers,U.S.
ISBN:  

9781439846698

ISBN 10:   1439846693
Pages:   190
Publication Date:   15 September 2010
Audience:   General/trade ,  College/higher education ,  General ,  Tertiary & Higher Education
Format:   Electronic book text
Publisher's Status:   Active
Availability:   Available To Order  
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Table of Contents

Introduction-Life span and sexual maturity; Spawning process; Fecundity; Egg size; Sperm count and sperm cells; Breeding sites; Breeding times; Breeding systems Sexual pattern Intersexuality Gonochorism-Gonadal differentiation; Morphotypes; Sex ratio; Operational sex ratio Unisexualism-Hybridization; Polyploidization; Poecilia formosa; Menidia clarkhubbsi; Carassius auratus; Cobitis complex; Poeciliopsis monacha-lucida; Phoxinus eos. neogaeus; Rutilus alburnoides Simultaneous hermaphroditism-Self-fertilizing hermaphrodites; Egg trading hermaphrodites; Potential self-fertilizers Sequential hermaphroditism Protogynous hermaphroditism-Transition load; Classification; Pathways and duration of sex change; Sex ratio Protandric hermaphroditism-Gonadal organization; Sex ratio; Pathways of sex change Serial hermaphroditism-Marian hermaphroditism; Okinawan hermaphroditism; Serial sex change; Cascade and causes of sex change Mating systems-Monogamy; Alternate mating strategies; Morphism; Lekking and promiscuity; Parental care References * Author index * Species index * Subject index

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T.J. Pandian: Visiting Professor, CAS Marine Biology, Annamalai University, Tamil Nadu, India

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