In the field of invasive species ecology, time is limited and funds are scarce, making it hard to do those intensive, long-term studies that would really let us know how a non-native species is affecting the ecosystem. As a result, the fact that very few species have been shown to have gone extinct due to the introduction of a non-native species is sometimes presented as evidence that invasive species are not really a problem. But as reported at Science Daily, a new study being published in the journal American Naturalist demonstrates that non-native birds and plants are establishing on islands in great numbers, pushing up tallies of local biodiversity while increasing global homogenization. There is evidence that this massive influx of species is influencing the ecosystem regardless of the fact that native species aren't disappearing. You can read the article abstract by going here and scrolling down the page.