Percentage life forms and total percent species per pathway. Columns show the percent of each life form per pathway type, with the total number of species per pathway above each column. For example, 35% of the species that can be introduced as ornamental plants are trees, and trees make up 45% of the species that can be spread by rivers. Black dots show the total percent of species per pathway type. For example, 78% of the total species can be introduced as ornamental plants, 63% as rivers and 48% by animals.