Journal
BEHAVIOURAL BRAIN RESEARCH
Volume 166, Issue 2, Pages 291-295Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.bbr.2005.07.011
Keywords
androgen levels testosterone; 11-ketotestosterone; cichlid fish; social status; Astatotilapia burtoni; challenge hypothesis
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Funding
- NIMH NIH HHS [F32MHO68175] Funding Source: Medline
- NINDS NIH HHS [NS R01-34950] Funding Source: Medline
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In vertebrates, circulating androgen levels are regulated by the hypothalamic-pituitary-gonadal (HPG) axis through which the brain controls the gonads via the pituitary. Androgen levels ultimately depend on factors including season, temperature, social circumstance, age, and other variables related to reproductive capacity and opportunity. Previous studies with an African cichlid fish, Astatotilapia burtoni, suggested that changes in both testosterone and 11-ketotestosterone (11-KT), an androgen specific to teleost fish, depend on male social status. Here we characterize circulating plasma concentrations of testosterone and 11-KT in socially dominant (territorial) and socially subordinate (nonterritorial) males. Territorial males have significantly higher circulating levels of both forms of androgen, which is another defining difference between dominant and subordinate males in this species. These results underscore how internal and external cues related to reproduction are integrated at the level of the HPG axis. (c) 2005 Elsevier B.V. All rights reserved.
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