Hormonal correlates of reproductive seasonality in wild female Hanuman langurs (Presbytis entellus)
Hormonal correlates of reproductive seasonality in wild female Hanuman langurs (Presbytis entellus)
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DOI：
10.1002/(sici)1098-2345(200006)51:2
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发表时间：
2000-06
影响因子：
2.4
通讯作者：
T. Ziegler;K. Hodges;P. Winkler;M. Heistermann
中科院分区：
文献类型：
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作者：
T. Ziegler;K. Hodges;P. Winkler;M. Heistermann
迄今为止，尚不清楚尼泊尔Ramnagar地区自由放养的哈努曼叶猴的性行为和交配的季节性发生是否与雌性卵巢功能的季节性变化有关，如果是的话，是什么因素触发了生殖期的开始。本研究采用无创粪便激素分析和行为观察相结合的方法，对生活在高季节性栖息地的野生叶猴雌性卵巢周期和受孕时间的季节性模式进行了研究和表征；2)考察卵巢周期、行为性发情与女性身体状况的季节关系。在14个月的时间里，研究人员收集了生活在多雄性群体中的9只雌性小鼠的行为数据和粪便样本。使用7倍量表，每月通过目视检查评估雌性的身体状况。通过测定提取的粪便中的免疫反应性孕二醇葡萄糖醛酸酯（iPdG）来确定排卵周期和受孕时间。雌性个体的激素谱在排卵周期的发生上有明显的季节性分布，主要集中在7 - 10月。雌性发情行为的分布具有相似的季节性特征，在所有发情期中，有88.2%的发情期伴有排卵。卵巢周期的开始以及交配活动与雨季的开始密切相关。雌性平均在第二个排卵周期受孕（怀孕时长：211.6±3.4天），受孕时间限制在动物身体状况改善的月份。总的来说，目前的数据清楚地表明，在拉姆纳加尔进行季节性繁殖的叶猴，生态条件（降雨、食物供应和质量）影响排卵的开始和受孕的时间。点。[j] .林业科学与技术，2006,31(1):1 - 4。©2000 Wiley‐Liss, Inc。
To date, it is not known whether the seasonal occurrence of sexual behavior and mating in free‐ranging Hanuman langurs at Ramnagar, Nepal, is correlated with seasonal changes in female ovarian function, and, if so, which factor(s) triggers the onset of the reproductive period. Using non‐invasive fecal hormone analysis in combination with behavioral observations, this study was carried out to: 1) investigate and characterize seasonal patterns of ovarian cyclicity and timing of conception in wild langur females living in a highly seasonal habitat; and 2) examine the relationship between seasonal patterns of ovarian cyclicity, behavioral estrus, and female physical condition. Behavioral data and fecal samples were collected during a total period of 14 months from nine females living in a multi‐male group. Physical condition of the females was assessed monthly by visual inspection, using a seven‐fold scale. Ovulatory cycles and timing of conceptions were identified by the measurement of immunoreactive pregnanediol glucuronide (iPdG) in extracted feces. Hormone profiles in individual females revealed a clearly seasonal distribution in the occurrence of ovulatory cycles, which were restricted to the period from July to October. The distribution of female estrus behavior showed a similar seasonal pattern, and in total 88.2% of all estrus periods observed in the focal females were accompanied by ovulation. Onset of ovarian cycles as well as mating activities were strongly correlated with the onset of the rainy season. Females conceived, on average, in their second ovulatory cycle (pregnancy length: 211.6 ± 3.4 days), with timing of conception being confined to the months when animals showed an improved physical condition. Collectively the present data clearly suggest that in seasonally‐breeding langurs at Ramnagar, ecological conditions (rainfall, food availability, and quality) influence the onset of ovulations and timing of conceptions. Am. J. Primatol. 51:119–134, 2000. © 2000 Wiley‐Liss, Inc.