GreenTracker| Wealth and population density, coupled with increased international trade and commerce, are the forces most linked to invasive species that disrupt ecosystems, causing severe ecological or agricultural damage. Previously, researchers believed the ‘culprits’ to be climate change and land cover.
Human activities often related to trade, travel and transport, particularly in the past 50 years, have caused a surge in the number of introduced species, ranging from plants to fungi, insects, fish, birds, reptiles and mammals. Some are innocuous, but many displace native species and cause a range of ecosystem disruption. As a crossroads of international travel and trade, with both a high population and high income, Europe has experienced many invasive species. via Science Daily