洞庭湖地区不同生态类型区鼠类群落组成及其演替趋势

20 0 1年对洞庭湖地区 3种生态类型区鼠类群落结构的取样调查结果表明 ,黑线姬鼠和社鼠是洞庭湖地区 3种生态类型区的主要优势鼠种。黑线姬鼠以农田为主要栖息地 ,在不同作物地间进行季节性迁移 ,并侵入到丘陵山林之中 ;社鼠是林地内的优势种 ;山区和丘陵的林缘农田生境则以这 2种鼠为优势种。从洞庭湖区鼠类群落的历史资料看 ,曾经为农田生态系统优势鼠种之一的褐家鼠的比例已大大降低 ,形成了以黑线姬鼠占绝对地位的格局。在房舍 ,褐家鼠的优势地位已被小家鼠取代

Rodent community structure and succession in different ecotypic areas in Dongting Lake region

Investigations on the rodent community structure in 3 ecotypic areas of Dongting Lake region in 2001 showed that Apodemus agrarius and Rattus confucianus were the dominant species in the three different ecotypic areas of the region.Apodemus agrarius inhabited mainly in the farmland,immigating from field to field seasonally following changes in crop cultivation and even invaded forests on hills.Rattus confucianus was the dominant species in the forests.The boundary areas between forest and farmland on the hills and mountains were dominated by both of them.Historical statistics in the region showed that Rattus norvegicus had once been the dominant species in the farmfield,but now it dropped rapidly in proportion and was displaced by Apodemus agrarius in dominance.Moreover,the dominance of Rattus norvegicus in farmhouses was also taken over by Mus musculus.