不同社群序位布氏田鼠的繁殖行为

在实验室条件下观察了捕自内蒙古草原的不同序位布氏田鼠的繁殖行为特征。结果表明，雌鼠对雄性配偶存在着激烈的竞争，高序位雌鼠获得被选择、交尾及产仔的机会最多，较低序位雌鼠若被选择并且产仔，则其序位将随之上升；高序位雄鼠对各个序位雌鼠均可选择，且在繁殖期间对同性个体表现很强的攻击性，以获得更多的交配机会。在社群繁殖中高序位雌、雄个体的作用明显高于低序位个体，这是布氏田鼠种群长期选择进化的生存策略。实验支持了布氏田鼠为混交制、一雄多雌的婚配制度推论。

Study on Reproductive Behavior of Different Social Hierarchy of Brandt's Vole

In order to understand the relationship between the social hierarchy a nd reproductive characteristic,the reproductive behavior of different social ra nks of BrandtDK's vole was studied in laboratory during the breeding seas on from Ma y to September of 2000 Observation of the behavior was carried out after the n i nety nine adult voles in fifteen typical families were sexually confirmed, weigh ed, numbered by cutting toes and marked by the hair cut The behavioral frequen c ies of different voles and the serial numbers of pregnant females were recorded The detailed results of behavioral analysis were shown as follows The competi t ion among females for male partners was fierce The dominant female acquired th e most chances of being selected to mate with, while the subordinate female might be chosen and its hierarchy got higher The dominant male, which may select all rankDK's females, has the most aggressive attacking behavior to other m ale s in ord er to obtain more breeding opportunities Based on the experimental analysis, a s a result of population evolution in long period, the conclusion that BrandtD K's vo les with high hierarchy played the most important role in social reproduction co uld be drawn, with agreement on the mating system of one male with females or mi xed mating