Competition for resources is one of the most common ways that introduced species can harm native species. When a new species is introduced, it can compete with native species for food, water, and habitat. This competition can be especially intense if the introduced species is more aggressive or has a higher reproductive rate than native species. In some cases, the introduced species may even completely displace native species from their natural habitat.
Predation is another major threat that introduced species can pose to native species. When a new predator is introduced, it can prey on native species that have not evolved defenses against it. This can lead to a rapid decline in the population of native species, and in some cases, even to their extinction.
Disease transmission is another way that introduced species can harm native species. When a new species is introduced, it can bring with it diseases that can be transmitted to native species. These diseases can be devastating to native species that have not evolved immunity to them. In some cases, disease transmission can even lead to the extinction of entire populations of native species.
In addition to these direct effects, the introduction of a new species can also have a variety of indirect effects on native species. For example, the introduction of a new species can alter the food web, which can have negative effects on native species that rely on certain food sources. The introduction of a new species can also change the physical environment, which can make it more difficult for native species to survive.
The introduction of a new species can be a serious threat to native species. In some cases, the introduction of a new species can even lead to the extinction of native species. It is important to be aware of the potential risks associated with the introduction of new species, and to take steps to minimize these risks.