Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.12/1497
Título: Androgen levels and social interactions in breeding males of the peacock blenny
Autor: Oliveira, Rui Filipe
Almada, Vítor Carvalho
Gonçalves, Emanuel João
Forsgren, E.
Canário, Adelino V. M.
Palavras-chave: Challenge hypothesis
Paternal care
Data: 2001
Editora: Blackwell Publishing
Citação: Journal of Fish Biology, 58, 897-908
Resumo: Nest-holder male Salaria pavo have lower circulating concentrations of 11-ketotestosterone (KT) at the beginning of the breeding season than at its peak. At that peak density of nesting males was higher as were the number of visits of sneaker males to nests and of agonistic interactions between nest-holders and sneaker males. There was no difference between the two dates either in the frequency of male–male interactions or in the frequency of courtship episodes. Thus, higher plasma levels in nest-holders might be explained by a more intense sneaking pressure at the peak of the breeding season. At that peak, nest-holders had higher plasma levels of KT and a higher testosterone (T) to KT metabolization index in the gonads than did floater males. Both nest-holders and floaters had higher levels of KT and T in the testicular gland than in the testis. The levels of both androgens in the testicular gland, but not in the testis, were correlated with circulating concentrations of KT. These results suggest that the testicular gland is the major source of circulating KT in blenniids. Nest-holders had higher metabolization indexes than floaters both in the testis and in the testicular gland, which suggests that nest holding status promotes the conversion of T into KT.
Peer review: yes
URI: http://hdl.handle.net/10400.12/1497
DOI: 10.1006/jfbi.2000.1501
ISSN: 0022-1112
Aparece nas colecções:UIE-E - Artigos em revistas internacionais

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