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Forebrain AVT and courtship in a fish with male alternative reproductive tactics
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Orientador(es)
Resumo(s)
In this paper, we present the results of cellular and
molecular studies on the neuroendocrine correlates of male
sexual polymorphism in a population of the blenniid fish Salaria
pavo (Risso). Bigger and older males defend nests, whereas
smaller and younger males mimic female nuptial coloration and
behavior to gain access to nests and sneak fertilizations. In this
population, sex-role reversal in courtship also occurs (i.e., females
are the courting sex). Immunocytochemistry and in situ
hybridization were used to examine the production of arginine
vasotocin (AVT) peptide and messenger RNA, respectively. The
expression of AVT mRNA on a per-cell basis was correlated
with mating behavior, rather than with sex morphotype, which
suggests that the greater level of AVT mRNA expression in
females and sneakers is correlated with the production of
courtship behavior. On the other hand, the number and size of
AVT peptide-producing cells in both male types is higher or
larger, respectively, than in females, which suggests that it is
correlated with sex morphotype, rather than with mating behavior.
Descrição
Palavras-chave
Sex-role reversal Sexual polymorphism Sex differences Neuropeptides
Contexto Educativo
Citação
Brain Research Bulletin, 57 (3/4), 23-25