千岛湖岛屿社鼠的扩散特征  

Dispersal characteristics of populations of Chinese white-bellied rats( Niviventer confucianus) in the Thousand Island Lake region

作　　者：张新玉[1] 王华[1] 鲍毅新[1] 王艳妮[1] 叶彬[1] 

机构地区：[1]浙江师范大学生态研究所,金华321004

出　　处：《生态学报》2016年第5期1312-1320,共9页Acta Ecologica Sinica

基　　金：浙江省自然科学基金(Y507080);国家自然科学基金项目(31200323);浙江省自然科学青年基金(LQ12C04001)

摘　　要：2009年7月—11月,2010年3月—11月对千岛湖两个岛屿上的社鼠(Niviventer confucianus)种群进行标志重捕,通过分析扩散个体的性别、年龄及扩散距离等,探讨陆桥岛屿环境下社鼠的扩散特征。研究结果显示:岛屿环境下社鼠的扩散率为37.96%,不同季节社鼠的扩散率存在差异,社鼠倾向于在春季发生扩散,尤其是3月份,社鼠扩散个体数最多;对于整个捕获史而言,雌雄扩散个体数存在极显著的差异(x^2=12.542,df=1,P<0.001),雄性个体更倾向于发生扩散;而在繁殖高峰期,当怀孕鼠存在时,雄性扩散数亦大于雌性,两者存在显著差异(x^2=4.504,df=1,P=0.034)。扩散个体体重的季节差异不显著;扩散与社鼠的年龄密切相关,社鼠更加倾向于在亚成年阶段发生扩散;另外,家群大小对社鼠扩散个体数量也有显著影响,家群越大,扩散个体越多;对扩散距离进行分析发现存在显著的性别差异(t=-9.229,df=50,P<0.001),雌性个体的平均扩散距离为(282.97±16.14)m,显著大于雄性的(146.70±6.80)m,而扩散距离与年龄、体重、最大活动距离均无显著相关性。We trapped two populations of Niviventer confucianus in the Thousand Island Lake region using the capture-markrecapture（ CMR） method from July to November 2009 and from March to September 2010,and explored the dispersal characteristics of the N. confucianus populations. The Biotas 2.0 software was used to calculate the dispersal distance. The x-2 test was used to analyze the effects of sex,season,and age on the number of dispersers. One-way analysis of variance（ ANOVA） was used to analyze the seasonal differences in body weight of the dispersers and the effects of age on the dispersal distance. The t test for independent samples was used to analyze the body weight differences between dispersers on two islands in the same season and the effect of sex on the dispersal distance. Linear regression analysis was used for correlation analysis. Our results showed that the dispersal ratio of N. confucianus was 37.96%,which is much higher than that of the Meriones unguiculatus and Microtus fortis that lived in the mainland. We considered the possibility that food and space limitations on the islands may lead to a dispersal ratio that is higher than that of mainland populations. The dispersal ratio showed significant differences among seasons,and the dispersal peak occurred in the spring,especially in March.Other studies showed that the peak breeding of N. confucianus occurs in April and May. We believe that the breeding behavior was fully active in the spring,contributing to the larger population size,and the breeding pressure led to the dispersal of some individuals. Sex-biased dispersal was detected,and the males were more likely to disperse（ x-2= 12.542,df = 1,P〈0. 001）. We assumed that more males dispersed in order to avoid inbreeding or to get more breeding opportunities,but this notion still needs genetic verification. A significant difference was found in the breeding period（ x-2=4.504,df = 1,P = 0. 034） when the pregnant rats were counted,which means that the pregnant females affected the dispersa

关 键 词：社鼠 扩散 婚配制度 千岛湖岛屿 

分 类 号：Q958.1[生物学—动物学]