南充城区小型兽类群落组成及优势种微尾鼩的性比特征

Composition of Small Mammal Community Structure and the Sex Ratio Characteristics of the Dominant Species (Anouro Sorex Squamipes) in Nanchong City

采用夹日法对南充城区的居民区、河谷、风景区和校园4种生境的小型兽类群落组成和优势种微尾的性比及其月变化和年龄组进行了研究.结果表明,南充城区共有微尾(Anourosorexsquamipes)、褐家鼠(Rattusnorvegicus)、社鼠(Niviventerconfucianus)、黄胸鼠(Rattusflavipecius)、黑线姬鼠(Apodemusagrarius)、大足鼠(Rattusnitidus)、小家鼠(Musmusculus)和灰麝(Crociduraattenuata)等8种小型兽类,群落组成以微尾为主.优势种微尾的总性比(♀/♂)为1.07(χ2=0.64,P>0.05),差异不显著,种群性比存在明显的年龄变化,但月性比变化不明显.

The composition of small mammal community structure and the variation of sex ratio characteristics among month and age groups of the dominant species (Anota-osorex squamipes) was studied in Nanchong City from September 2003 to April 2004. Trapping night method was used in four investigation sites located in residential (habitats,) riverside, beauty spot and campus.The results showed that there were eight species of small mammals in Nanchong City:Anourosorex squamipes, Rattus norvegicus, Niviventer confucianus, Rattus flavipecius, Apodemus agrarius, Rattus nitidus,Mus musculus and Croci dura attenuata, Anourosorex squamipes was the dominant species and its sex ratio in wild population was 1.07 (♀/♂ ) ( x^2=0. 64, P>0. 05); The sex ratio changing among age groups and month, but the sex ratio changing among month was insignificant.