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	Provedor de dados Neotropical Ichthyology (1) RChHN (1) Autor Azevedo,Juliana de S. (1) Dansa-Petretski,Marilvia (1) Lima,Neuza R. W. (1) SOTO- GAMBOA,MAURICIO (1) Silva,Leonardo G. da (1) Palavra-chave Total testosterone (2) 17 Beta-estradiol (1) Aggressive behavior (1) Binding-proteins (1) Challenge hypothesis (1) Free testosterone (1) Globulin (1) Octodon degus (1) Prevalence of parasitism (1) Scales lines (1) Mais... Tipo do documento Info:eu-repo/semantics/article (1) Journal article (1) Ano 2007 (1) 2005 (1) País Brazil (1) Chile (1) Idioma Inglês (2)		Ordenar por:  Relevância Autor Título Ano Registros recuperados: 2 Primeira ... 1 ... Última Parasitic castration, growth, and sex steroids in the freshwater bonefish Cyphocharax gilbert (Curimatidae) infested by Riggia paranensis (Cymothoidea) Neotropical Ichthyology Lima,Neuza R. W.; Azevedo,Juliana de S.; Silva,Leonardo G. da; Dansa-Petretski,Marilvia. Cyphocharax gilbert shows parasitic castration when infested by the crustacean Riggia paranensis, being unable to reproduce. Fish were sampled in the middle rio Itabapoana, Brazil, to study the prevalence of parasitism, growth, and sex steroid concentrations, considering the body size, sex, and reproductive condition of specimens. Most of the fish analyzed were infested (56.0%). The presence of two lines on the scales was more frequent among infested fish (22.0%) than among fish without parasites (12.0% for females and 10.0% for males). The occurrence of three lines on the scales was rare (3.5% among infested and 2.0% among females without parasites). These results suggest that growth of the host is faster than that of non infested fish. The serum... Tipo: Info:eu-repo/semantics/article Palavras-chave: Prevalence of parasitism; Scales lines; 17 Beta-estradiol; Total testosterone. Ano: 2007 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1679-62252007000400006 Free and total testosterone levels in field males of Octodon degus (Rodentia, Octodontidae): accuracy of the hormonal regulation of behavior RChHN SOTO- GAMBOA,MAURICIO. Animals exhibit continuous seasonal changes in physiological, morphological and behavioral traits associated to their natural annual cycles. One of the most important changes in the organism occurs at the initiation of breeding season. In males these changes include activation of spermatogenesis, enhance of sexual secondary characters and an increase of aggressiveness. All of theses changes are basically regulated by testosterone, but the physiological basis of this testosterone regulation and the effective hormone proportion that acts in target tissues are unknown. In this work I evaluated the relationship between total testosterone, free testosterone associated to aggressive behavior in wild males of Octodon degus. I compared hormonal levels and... Tipo: Journal article Palavras-chave: Free testosterone; Total testosterone; Globulin; Binding-proteins; Aggressive behavior; Challenge hypothesis; Octodon degus. Ano: 2005 URL: http://www.scielo.cl/scielo.php?script=sci_arttext&pid=S0716-078X2005000200006 Registros recuperados: 2 Primeira ... 1 ... Última

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