Abstract: From November 2009 to January 2010, an investigation was conducted to study the winter time habitat selection of wild boar (Sus scrofa ussuricus) in Huangnihe Nature Reserve. Based on the biological characters of wild boar and the landform characteristics of Huangnihe Nature Reserve, 47 line transects were installed, and the ecological factors for the selection by wild boar, including altitude, slope position, aspect, slope gradient, vegetable type, crown density, tree height, tree diameter, food abundance, sheltering class, distance from water source, and distance from human disturbance, were investigated. In winter time, the wild boar in the reserve preferred the broadleaf forest and broadleaf-conifer mixed forest at altitude ≤1000 m and lower southern slope position, with high food abundance and sheltering class and normal crown density, near water source, and far away from human disturbance. Principal component analysis showed that the first 4 principal components of test habitat site variables explained 77.5% of the total variance. The primary factors determining the habitat selection of wild boar were altitude, slope gradient, and distance from human disturbance, and the secondary factors were tree diameter, sheltering class, and distance from water source.

Key words: Bt transgenic cotton, Ecological risk, Risk assessment, Insect resistance, IPM