Bridgehead effects distort global flows of alien species
Bertelsmeier, C., & Ollier, S. (2021). Diversity and Distributions, ddi.13388. https://doi.org/10.1111/ddi.13388
A major goal of invasion biology is to understand global species flows between donor and recipient regions. Our current view of such flows assumes that species are moved directly from their native to their introduced range. However, if introduced populations serve as bridgehead populations that generate additional introductions, tracing intercontinental flows between donor and recipient regions misrepresents the introduction history. Here, we show that such bridgehead effects distort our view of global species flows.