Variability of GnRH secretion in two goby species with socially controlled alternative male mating tactics

Hormones and Behavior
Marta ScaggianteMaria Berica Rasotto

Abstract

Male reproductive phenotypic plasticity related to environmental-social conditions is common among teleost fish. In several species, males adopt different mating tactics depending on their size, monopolizing mates when larger, while parasitizing dominant male spawns when smaller. Males performing alternative mating tactics are often characterized by a strong dimorphism in both primary and secondary reproductive traits. According to studies on sex-changing species and on species where only one male morph is reproductively active, male alternative phenotypes are expected to vary also in gonadotropin-releasing hormone (GnRH) neurons in forebrain preoptic area (POA). Here, we compared the intra- and inter-sexual variations in number and size of GnRH neurons, along with gonads and male accessory structure investment, in two goby species, the grass goby, Zosterisessor ophiocephalus, and the black goby, Gobius niger, characterized by male alternative mating phenotypes. In both species, older and larger males defend nests, court and perform parental care, while younger and smaller ones try to sneak territorial male spawning. We found that grass goby and black goby have different patterns of GnRH expression. Grass goby presents a clear ...Continue Reading

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Apr 25, 2012·Annual Review of Neuroscience·Russell D Fernald
Feb 6, 2007·Comparative Biochemistry and Physiology. Part A, Molecular & Integrative Physiology·Karen P MaruskaTimothy C Tricas
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Dec 16, 2011·Physiology·Karen P Maruska, Russell D Fernald
Oct 20, 2020·Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences·Matthew C Kustra, Suzanne H Alonzo

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