Testosterone, growth and the evolution of sexual size dimorphism
Testosterone, growth and the evolution of sexual size dimorphism
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DOI：
10.1111/j.1420-9101.2009.01772.x
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发表时间：
2009-08-01
影响因子：
2.1
通讯作者：
Calsbeek, R.
中科院分区：
文献类型：
--
作者：
Cox, R. M.;Stenquist, D. S.;Calsbeek, R.
宏观进化模式与发育机制的整合是表型进化研究的一个突出挑战。在这里，我们使用的实验和比较数据相结合，以测试是否进化方向的性别大小二型性（SSD）对应的内分泌调节生长的潜在变化。首先，我们结合联合收割机圈养繁殖的研究与标记重捕数据表明，男性偏向SSD的棕色变色蜥蜴（Anolis sagrei）的发展，因为男性增长显着快于女性的青少年和成年人。然后，我们使用阉割手术和睾丸激素植入来证明阉割抑制，睾丸激素刺激，男性的成长。我们的结论是审查出版的睾酮操纵其他有鳞爬行动物的进化模式的背景下，在SSD。总的来说，这些研究表明，SSD的演变伴随着睾酮对男性生长影响的潜在变化，可能促进SSD的快速演变。
The integration of macroevolutionary pattern with developmental mechanism presents an outstanding challenge for studies of phenotypic evolution. Here, we use a combination of experimental and comparative data to test whether evolutionary shifts in the direction of sexual size dimorphism (SSD) correspond to underlying changes in the endocrine regulation of growth. First, we combine captive breeding studies with mark-recapture data to show that male-biased SSD develops in the brown anole lizard (Anolis sagrei) because males grow significantly faster than females as juveniles and adults. We then use castration surgeries and testosterone implants to show that castration inhibits, and testosterone stimulates, male growth. We conclude by reviewing published testosterone manipulations in other squamate reptiles in the context of evolutionary patterns in SSD. Collectively, these studies reveal that the evolution of SSD has been accompanied by underlying changes in the effect of testosterone on male growth, potentially facilitating the rapid evolution of SSD.