Role reversal in bed

Added: Courtnay Kyle - Date: 31.08.2021 15:54 - Views: 41833 - Clicks: 584

In most bird species males compete over access to females and have elevated circulating androgen levels when they establish and defend a breeding territory or guard a mate. Testosterone is involved in the regulation of territorial aggression and sexual display in males. In few bird species the traditional sex-roles are reversed and females are highly aggressive and compete over access to males. Such species represent excellent models to study the hormonal modulation of aggressive behavior in females.

Plasma sex steroid concentrations in sex-role reversed species follow the patterns of birds with "traditional" sex-roles. The neural mechanisms modulating endocrine secretion and hormone-behavior interactions in sex-role reversed birds are currently unknown. We investigated the sex differences in the mRNA expression of androgen receptors, estrogen receptor alpha, and aromatase in two brain nuclei involved in reproductive and aggressive behavior in the black coucal, the nucleus taeniae and the bed nucleus of the stria terminalis.

In the bed nucleus there were no sex differences in the receptor or aromatase expression. In the nucleus taeniae, however, we show for the first time, that females have a higher mRNA expression of androgen receptors than males. These suggest that the expression of agonistic and courtship behavior in females does not depend on elevated blood hormone levels, but may be regulated via increased steroid hormone sensitivity in particular target areas in the brain.

Hence, aggression in females and males may indeed be modulated by the same hormones, but regulated at different levels of the neuroendocrine cascade. Please enable it to take advantage of the complete set of features! Clipboard, Search History, and several other advanced features are temporarily unavailable. Search: Search. Advanced Clipboard. Display options Display role reversal in bed. Create file Cancel. citation Subject: 1 selected item: - PubMed. Format: Summary Summary text Abstract Abstract text.

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Similar articles Territorial aggression, circulating levels of testosterone, and brain aromatase activity in free-living pied flycatchers. Silverin B, et al. Horm Behav. PMID: Seasonal changes in aromatase and role reversal in bed receptor, but not estrogen receptor mRNA expression in the brain of the free-living male song sparrow, Melospiza melodia morphna. Wacker DW, et al. J Comp Neurol. Low sex steroids, high steroid receptors: Increasing the sensitivity of the nonreproductive brain.

Canoine V, et al. Dev Neurobiol. Do sex differences in the brain explain sex differences in the hormonal induction of reproductive behavior? What 25 years of research on the Japanese quail tells us. Balthazart J, et al.

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PMID: Review. Sex differences in androgen-regulated expression of cytochrome P aromatase in the rat brain. Roselli CE, et al.

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J Steroid Biochem Mol Biol. See all similar articles. Cited by 24 articles How research on female vertebrates contributes to an expanded challenge hypothesis. Rosvall KA, et al. Epub Sep Wingfield JC, et al. Front Endocrinol Lausanne. Genes linked to species diversity in a sexually dimorphic communication al in electric fish. Smith GT, et al. Epub Oct Aggressive behaviours track transitions in seasonal phenotypes of female Siberian hamsters. Rendon NM, et al. Funct Ecol. Epub Jan Neuroendocrine correlates of sex-role reversal in barred buttonquails.

Voigt C. Proc Biol Sci. See all "Cited by" articles. Publication types Research Support, Non-U. Gov't Actions. MeSH terms Animals Actions.

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Female Actions. Gene Expression Actions. In Situ Hybridization Actions. Male Actions. Substances Estrogen Receptor alpha Actions. RNA, Messenger Actions. Receptors, Androgen Actions.

Role reversal in bed

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