Heritable variation in testosterone levels in male garter snakes ( Thamnophis sirtalis )

Heritable variation in testosterone levels in male garter snakes ( Thamnophis sirtalis )
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雄性袜带蛇(Thamnophis Sirtalis)睾酮水平的遗传变异

DOI:
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发表时间:
2004
期刊:
影响因子:
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通讯作者:
C. J. Hubbard
C. J. Hubbard
中科院分区:
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文献类型:
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作者:
R. King;J. Cline;C. J. Hubbard

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在76条雄性吊带蛇(Thamnophis sirtalis)的195、318和437天龄时测量了循环睾酮水平,这些雄性吊带蛇是由26条野生捕获的雌性所生的。睾酮水平在三个年龄阶段均随体重的增加而显著增加,在318天和437天的家庭间差异显著。在318天和437天的时候,“全同胞”遗传率估计接近1,但这些估计可能会被母体效应、显性和上位性所夸大。循环睾酮水平的遗传变异证据表明,受这种激素影响的性状(生殖、领土和竞争行为;体型和形状)的进化可能通过这种激素控制机制的变化来调节。
Circulating testosterone levels were measured at 195, 318 and 437 days of age in 76 male garter snakes (Thamnophis sirtalis) born to 26 wild-caught females. Testosterone levels increased significantly with increasing mass at all three ages and differed significantly among families at 318 and 437 days.‘Full-sib’ estimates of heritability were near one at 318 and 437 days but these estimates may be inflated by maternal effects, dominance and epistasis. Evidence of heritable variation in circulating testosterone levels suggests that the evolution of traits affected by this hormone (reproductive, territorial and agonistic behaviour; body size and shape) might be mediated through changes in this hormonal control mechanism.
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