Potential Invasion Danger Risk Assessment of Alien Fishes in Yarlung Zangbo River, Tibet

In recent years, with the development of aquaculture and the intensification of human activities, a total of 13 alien fishes are introduced into the Yarlung Zangbo River on the Tibet Plateau. Among them, 8 species of them are established and 5 of them are not yet. To study the mechanism of invasion and building the early warming system of potential danger of introduced species, we compiled 23 life-history and ecological characteristics of the 13 alien fish species. The phylogenetic history is also given into consideration to make sure the species are independent samples. Applying ANOVA, Mann-Whitney U test and principal coordinate analysis on the fish traits of life history, we validated two hypotheses proposed in this study. There are significant differences of life-history and ecological traits between successful established species and not-established species. It also reveals that the ecological niches of successful established species and of not-established species are separated from each other. Further more, a model developed by discriminate analysis correctly categorized established fishes with 100% accuracy. We then identified 15 species that have a high risk to establish in the Basin of Yarlung Zangbo River if introduced from their native area.