Prevention of the introduction of new invasive species to a country is considered to be an effective measure against biological invasions. The growth of online sellers, however, makes the regulation of plant introductions much more challenging - a new plant is only a few clicks away and can be bought very easily.
Information on how or why alien species arrive in a country can help prevent future introductions. Such information is usually stored in databases, and in many parts of the world, these databases are used for research and management.
Have you ever wondered why species are organised in such a way that species in one group interact more with each other, than with species in other groups?
When we consider how invasive alien species affect native species, we mainly think of alien predators preying on native species. However, there are examples of native species that prey on alien species - which leads ecologists to the question “what are the effects of alien prey on predatory-prey relationships?”
Human impacts such as pollution, habitat degradation and invasive alien species threaten freshwater fishes, and as a result of these impacts, fishes in headwater streams are often cut off from larger populations in the river.