Spatial distribution of invasive alien animal and plant species and its influencing factors in China

The distribution of invasive alien species is influenced by abiotic and biotic factors.Understanding distribution patterns is crucial for prediction,risk prevention,and management of invasive alien species.Based on invasive alien species,environmental conditions,and anthropological factors,we used principal component analysis (PCA) and canonical correspondence analysis (CCA) to explore the spatial distribution patterns and densities of invasive alien species and their determining factors in China.Furthermore,we analyzed the relationship between diversity of invasive alien and native species at both country and regional scales.Results showed that the number and density of invasive alien species (138 animal species;384 plant species) decreased from the southeast coast to inland northwest China and invasive animals and plants showed the same pattern.Our results indicated that mean annual precipitation (MAP) and gross domestic product (GDP) are key factors shaping the distribution patterns of invasive alien species in China.Invasive alien species diversity and native species diversity were significantly positively correlated with each other,though correlations differed in different regions,depending on the study scale.