Onset of Daily Activity in a Female Songbird Is Related to Peak-Induced Estradiol Levels
Onset of Daily Activity in a Female Songbird Is Related to Peak-Induced Estradiol Levels
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雌性鸣禽日常活动的开始与峰值引起的雌二醇水平有关
DOI：
10.1093/icb/icz112
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发表时间：
2019
影响因子：
2.6
通讯作者：
Greives, Timothy J.
中科院分区：
文献类型：
--
作者：
Graham, Jessica L.;Needham, Katie B.;Bertucci, Emily M.;Pearson, Alexis A.;Bauer, Carolyn M.;Greives, Timothy J.
对圈养鸟类和哺乳动物的研究表明，昼夜节律（即，每日）的行为节律响应于性类固醇激素的增加而改变。最近，我们和其他人已经证明了在峰值（促性腺激素释放激素[GnRH]诱导的性）类固醇水平的高度个体重复性，我们已经发现，这些GnRH诱导的水平与他们的日常（夜间）内源性峰值高度相关。在野生动物中，生殖内分泌轴的组织和活动的个体差异是否与每日时间有关还不清楚。为了开始探索这些可能的联系，我们测试的假设，最大水平的性类固醇激素雌二醇（E2）和发病的日常活动有关的雌性鸣禽，黑眼睛junco（junco hyemalis）。我们发现，雌性与高水平的GnRH诱导的E2离开他们的巢在早上显着早于女性与低刺激水平。我们没有观察到睾酮和这种活动开始的测量之间的关系。我们的研究结果表明，一个人的生殖内分泌轴和昼夜节律系统之间的相互作用和变化观察到一个人的日常活动开始。我们建议未来的研究检查最大性类固醇激素和日常活动开始的时间之间的关系。
Research in captive birds and mammals has demonstrated that circadian (i.e., daily) behavioral rhythms are altered in response to increases in sex-steroid hormones. Recently, we and others have demonstrated a high degree of individual repeatability in peak (gonadotropin-releasing hormone [GnRH]-induced sex) steroid levels, and we have found that these GnRH-induced levels are highly correlated with their daily (night-time) endogenous peak. Whether or not individual variation in organization and activity of the reproductive endocrine axis is related to daily timing in wild animals is not well known. To begin to explore these possible links, we tested the hypothesis that maximal levels of the sex steroid hormone estradiol (E2) and onset of daily activity are related in a female songbird, the dark-eyed junco (Junco hyemalis). We found that females with higher levels of GnRH-induced E2departed from their nest in the morning significantly earlier than females with lower stimulated levels. We did not observe a relationship between testosterone and this measure of onset of activity. Our findings suggest an interaction between an individual’s reproductive endocrine axis and the circadian system and variation observed in an individuals’ daily activity onset. We suggest future studies examine the relationship between maximal sex-steroid hormones and timing of daily activity onset.