Testicular melanization in anuran species: ontogeny and sexual maturity
نویسندگان
چکیده
منابع مشابه
Ontogeny of central melatonin receptors in tadpoles of the anuran
11 Abstract The objective of this work was to study mela12 tonin receptors in the eye and the brain and their pos13 sible functionality in the ontogeny of Rana perezi. The 14 binding of 2-[I]melatonin increases throughout 15 embryonic larval development in both tissues. The most 16 pronounced increase takes place at the end of premeta17 morphosis and during early prometamorphosis. This 18 rise ...
متن کاملSexual dimorphism of AMH, DMRT1 and RSPO1 localization in the developing gonads of six anuran species.
In vertebrates, several genes which are differentially expressed in various species, have been implicated in sex determination and gonadal differentiation. We used immunolocalization to study the expression pattern of three proteins AMH, DMRT1, RSPO1 involved in the sexual differentiation of gonads. The pattern of AMH, DMRT1 and RSPO1 expression was analyzed in X. laevis and in five other diver...
متن کاملMating Signals Indicating Sexual Receptiveness Induce Unique Spatio-Temporal EEG Theta Patterns in an Anuran Species
Female mate choice is of importance for individual fitness as well as a determining factor in genetic diversity and speciation. Nevertheless relatively little is known about how females process information acquired from males during mate selection. In the Emei music frog, Babina daunchina, males normally call from hidden burrows and females in the reproductive stage prefer male calls produced f...
متن کاملSex identification and sexual maturity stages in farmed great sturgeon, Huso huso L. through biopsy
Since sturgeons have no external sexual dimorphism and there are no external markers to determine sex, internal examination of the gonads should be used to sex identification. The present study describes the biopsy method and histological observations of the gonads of great sturgeon (Huso huso) in both sexes at different age classes. Sex and maturity stages of 226 great sturgeons were identifie...
متن کاملInheritance of Age at Sexual Maturity
Dr. RAYMOND PEARL (1912) was the first worker to suggest that sexlinked factors were involved in the inheritance of fecundity. PEARL used as a measure of fecundity the eggs produced during the winter period. He proposed that two major dominant factors were responsible for high egg production, one of which resided in the sex chromosome. GOODALE (1919) and HURST (1921) each failed to confirm the ...
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ژورنال
عنوان ژورنال: Amphibia-Reptilia
سال: 2020
ISSN: 0173-5373,1568-5381
DOI: 10.1163/15685381-20191206