Multi-scale Analysis Of Spatial Patterns Of Invasive Alien Animals In China And Its Influence Factors

Biological invasion is one of the three most urgent environmental problems. The invasion of alien animal has caused biodiversity loss, ecological environmental damage and economic losses in China. To our knowledge, however, factors influencing the spatial patterns of these invasive animals have not been evaluated in China. Thus, it is very important to clarify the pattern of spatial distribution in various scales and to evaluate the influencing factors of invasive alien animals for further prediction and management. In this study, the patterns of spatial distribution of invasive animals and influences of the natural environmental factor and anthropogical factors in local and regional scale were analyzed by the principal component analysis and the multiple stepwise regression analysis using a database based on the publications. Results showed that there were136alien invasive animals recorded in China, among which insect was accounted for56.6%. From area of origin,31alien invasive animals are from North America among136alien invasive animals, following by Asia, South America, Africa and Europe. The invasive animals of China were mainly introduced in the unintentional ways, accounting for53.6%of the total invasive animal number. The number of invasive alien animals at the national scale decreased from the southeast to the northwest which was largely determined by latitude. The density of invasive alien animals at the national scale decreased from the southeast to the northwest, which could be attributed to the population density. However, in local scale the patterns of spatial distribution of invasive alien animals and influences factor varied greatly, indicating the diverse factors that affected the spatial pattern of invasion alien animal at the regional scale is different. Our findings could be important implications for and the management of the invasive alien animals in China.