Mauget R, Garcia V, Jouventin P
Centre d'Etudes Biologiques de Chizé/CNRS, Villiers en Bois, France.
Gen Comp Endocrinol. 1995 May;98(2):177-84. doi: 10.1006/gcen.1995.1058.
Changes in plasma LH, prolactin, testosterone, estradiol, and progesterone were investigated throughout moult and reproduction in free-living male and female Gentoo penguins (Pygoscelis papua) at Crozet Island (46 degrees S, 51 degrees E), where this species is able to relay after a reproductive failure. In both sexes, LH, prolactin, and steroid hormones, remained at basal levels during the moult. LH level was highest at the time of arrival at the colony for breeding and, although it decreased after courtship, it did not drop at basal value by incubation and first chick brooding period. Prolactin peaked for both chick brooding periods; replacement clutch was associated with an increased secretion of LH, whereas high prolactin levels were maintained. Testosterone, in male, and estradiol, in female, peaked during courtship I and chick brooding II; progesterone, in female, peaked during courtship I and II. These hormonal patterns are consistent with those observed in passerine species which are also able to relay after a reproductive failure. Winter breeding observed at Crozet Island might reflect the extreme adaptive capacity of Gentoo penguin species.
在克罗泽群岛（南纬46度，东经51度）对野生巴布亚企鹅（Pygoscelis papua）的雄性和雌性个体在换羽及繁殖全过程中血浆促黄体生成素（LH）、催乳素、睾酮、雌二醇和孕酮的变化进行了研究，该物种在繁殖失败后能够再次繁殖。在两性中，换羽期间LH、催乳素和类固醇激素均维持在基础水平。到达繁殖地时LH水平最高，尽管求偶后有所下降，但在孵化和首次育雏期并未降至基础值。催乳素在两个育雏期均达到峰值；重新产卵与LH分泌增加有关，而催乳素水平保持较高。雄性的睾酮和雌性的雌二醇在求偶I期和育雏II期达到峰值；雌性的孕酮在求偶I期和II期达到峰值。这些激素模式与在繁殖失败后也能够再次繁殖的雀形目物种中观察到的一致。在克罗泽群岛观察到的冬季繁殖可能反映了巴布亚企鹅物种极强的适应能力。
