发情期的雄性麋鹿根据序位分为群主、挑战者和单身汉3个等级,序位变化是雄性麋鹿应对环境压力的直 观体现。本文利用胆量和侵犯2个行为指标在麋鹿生活史不同阶段的耦合强弱,来解释幼体时麋鹿序位发育、亚 成体时雄性序位定型及发情期时挑战者对群体序位的扰动。行为取样采用焦点取样法和扫描取样法相结合;分 析个体间行为样本流的非同步化水平,以同类型行为中较早发生、同步化率较低的判断为胆大;侵犯则结合攻 击行为和取胜指数来判定;粪样睾酮水平测定采用放射免疫分析法。结果显示雄性麋鹿幼体胆量和侵犯耦合与 等级序位呈负相关(r=-0.111 8,P=0.018 3);成体胆量和侵犯耦合与等级序位的波动呈正相关(r=0.917 9,P= 0.002 6)。从亚成体到成体:4头雄性麋鹿序位上升(胆量和侵犯耦合r=0.852 3,P=0.000 3),其中1头成为鹿 王;4头序位未发生改变(胆量和侵犯耦合r=0.482 9,P=0.006 3);3头序位下降(胆量和侵犯耦合r=0.251 7, P=0.003 5)。雄性麋鹿幼体睾酮水平与等级序位呈正相关(r=0.860 7,P=0.005 5);亚成体睾酮水平与等级序 位呈正相关(r=0.845 7,P=0.004 4);成体睾酮水平与等级序位呈正相关(r=0.954 6,P=0.001 8)。结果表明雄 性麋鹿发情期胆量和侵犯耦合强度与等级序位波动呈正相关;等级序位上升与睾酮水平升高有关。
In estrus,male Père David's Deer (Elaphurus davidianus) are divided into three ranks:king,challenger and bachelor.The order change was an intuitive performance of males'face to pressures.In this paper,the coupling degree of boldness and aggression in different stages of the life history of Père David's Deer was used to explain the rank development of Père David's Deer when they were young,the rank formation when they were sub-adults,and the rank fluctuations of the challenger during estrus.The behavior sampling method combines focus sampling and scanning sampling. Boldness was judged as the un-synchronization level of the behavior sample flow,and the early occurrence and low presynchronization rate of the same type of behavior.Aggression was judged by combination of aggressive behavior and winning index.Fecal testosterone levels were determined by radioimmunoassay.The results showed that there was a negative correlation between boldness and aggression coupling and grade development (r=-0.111 8,P=0.018 3) in young Père David's Deer.There was a positive correlation between boldness and aggression coupling and rank fluctuation (r=0.917 9,P=0.002 6) in sub-adults Père David's Deer.From sub-adult to adult estrus stage,four Père David's Deers achieved rank rise (boldness and aggression coupling r=0.852 3,P=0.000 3),and a Père David's Deer became the king.Four Père David's Deers did not change (boldness and aggression coupling r=0.482 9,P=0.006 3).Three Père David's Deers rank decreased (boldness and aggression coupling r=0.251 7,P=0.003 5).There was a positive correlation between testosterone level and rank of young Père David's Deer (r=0.860 7,P=0.005 5).There was a positive correlation between testosterone level and rank of sub-adult Père David's Deer (r=0.8457,P=0.004 4).There was a positive correlation between testosterone level and rank of adult Père David's Deer in rut (r=0.954 6,P=0.001 8).Con- clusion:The coupling strength of boldness and aggression is positively correlated with the rank fluctuation of male Père David's Deer during estrus.Elevated rank is associated with raised secretion of testosterone levels.
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