Moore M C, Crews D
Gen Comp Endocrinol. 1986 Sep;63(3):424-30. doi: 10.1016/0016-6480(86)90142-5.
The lizard genus Cnemidophorus consists of both sexual species and unisexual, all-female species. We characterized changes in circulating levels of gonadal sex steroid hormones in males and females in one of the sexual species, C. inornatus, to compare them to previously measured levels in a unisexual, parthenogenetic species, C. uniparens. Reproductively active male C. inornatus have high levels of dihydrotestosterone and somewhat lower levels of testosterone. These levels are highest immediately after females become sexually receptive and decrease later at the onset of testicular regression. Female C. inornatus have high levels of estradiol and low levels of progesterone during the previtellogenic and vitellogenic phases of the ovarian cycle. During the postovulatory phase, they have low levels of estradiol and high levels of progesterone. We could not detect circulating levels of androgen at any phase of the ovarian cycle. The patterns of hormone secretion in the female C. inornatus are virtually identical to those of its direct evolutionary descendant, C. uniparens. This confirms our previous conclusion that the evolution of the parthenogenetic mode of reproduction and expression of male-like pseudosexual behavior that are characteristic of the unisexual C. uniparens has not been accomplished by evolutionary modifications in the pattern of sex steroid hormone secretion. Rather it is the response to this pattern of secretion that has been modified.
鞭尾蜥属（Cnemidophorus）既包含有性生殖物种，也包含孤雌生殖的单性全雌性物种。我们对有性生殖物种丽纹鞭尾蜥（Cnemidophorus inornatus）的雄性和雌性体内性腺性类固醇激素的循环水平变化进行了特征描述，以便与之前在单性、孤雌生殖物种单性鞭尾蜥（Cnemidophorus uniparens）中测得的水平进行比较。处于生殖活跃期的雄性丽纹鞭尾蜥体内二氢睾酮水平较高，睾酮水平略低。这些水平在雌性开始具有性接受能力后立即达到最高，随后在睾丸退化开始时下降。雌性丽纹鞭尾蜥在卵巢周期的卵黄生成前期和卵黄生成期，雌二醇水平较高，孕酮水平较低。在排卵后期，它们的雌二醇水平较低，孕酮水平较高。在卵巢周期的任何阶段，我们都检测不到雄激素的循环水平。雌性丽纹鞭尾蜥的激素分泌模式与其直接进化后代单性鞭尾蜥几乎相同。这证实了我们之前的结论，即单性鞭尾蜥所特有的孤雌生殖方式的进化以及类似雄性的假性行为的表达，并非通过性类固醇激素分泌模式的进化改变而实现。相反，是对这种分泌模式的反应发生了改变。
