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      Androgens and Mating Systems: Testosterone-induced Polygyny in Normally Monogamous Birds

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      The Auk
      JSTOR

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          Abstract

          Recent investigations of the plasma profiles of testosterone (T) in free-living birds suggest that circulating levels of T during the reproductive cycle remain elevated longer in males of polygynous species than in males of monogamous species. When the hormonal profile of polygynous males is mimicked by the administration of subcutaneous implants of T to males of monogamous species, thus maintaining plasma levels of this androgen at high vernal levels, frequencies of territorial aggression and courtship behavior remain elevated, resulting in a marked increase in the size of the territory. A substantial number of T-implanted males also become polygynous, attracting two and sometimes three females to settle on their enlarged territories. These data suggest strongly that the nature of avian mating systems is regulated proximately by temporal patterns of hormone secretion.

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          Most cited references18

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          The operated Markov´s chains in economy (discrete chains of Markov with the income)

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            The determination of five steroids in avian plasma by radioimmunoassay and competitive protein-binding.

            A method has been developed for the simultaneous determination of testosterone, 5alpha-dihydrotestosterone and corticosterone, or of estrone, estradiol-17beta and corticosterone, after separation on a Celite:propylene glycol:ethylene glycol column (6:1.5:1.5 w/v/v). The lower quarter of the column was packed with a Celite: water mixture (3:1 w/v) as a stationary phase (glycol) 'trap'. This effectively prevented leaching of the glycols into the eluate as the concentration of ethyl acetate in the mobile phase was increased to elute the more polar steroids. In addition, a second system utilizing a Celite: ethylene glycol column (2:1 w/v) for the separation of estrone and estradiol-17beta is described. Testosterone, 5alpha-dihydrotestosterone, estrone and estradiol-17beta were measured by radioimmunoassay and corticosterone by a competitive protein-binding technique. Reliability criteria are presented showing that the assay systems used are accurate and reproducible. Plasma-steroid levels of eight avian species are also presented and compared with those found by other investigators.
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              Physiological Stress in Birds

              H S Siegel (1980)
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                Author and article information

                Journal
                The Auk
                JSTOR
                0004-8038
                1938-4254
                October 1984
                October 01 1984
                October 1984
                October 01 1984
                : 101
                : 4
                : 665-671
                Affiliations
                [1 ]The Rockefeller University Field Research Center, Tyrrel Road, Millbrook, New York 12545 USA
                Article
                10.2307/4086893
                b91015a8-addb-426d-92de-884736348047
                © 1984
                History

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