What are the biological invasion phenomena? Specific performance, reason

Biological invasion refers to the phenomenon that a certain organism is introduced naturally or artificially from other places and becomes wild, which causes certain harm to the local ecosystem. These creatures are called alien species. For example, the American white moth, which was popular for a while in the early stage.

After the alien pests invade the new suitable growth area, their populations will multiply rapidly and gradually develop into new local "dominant species", which will seriously damage the local ecological security. Specifically, the consequences mainly include the following points: First, the invasion of alien species will seriously destroy the biodiversity of organisms and accelerate species extinction. Biodiversity includes all plants, animals, microbial species and their genetic information, as well as complex systems at different levels formed by organisms and their living environment. [2] Although the biodiversity of a country or region is endowed by nature, any country must invest a lot of manpower and material resources to try its best to maintain its biodiversity. However, the invasion of alien species is the number one enemy threatening biodiversity. After the introduction of invasive species into different places, due to the lack of natural enemies and other restrictive factors that can limit their reproduction, the consequences are rapid diffusion, massive expansion, formation of dominant species, and competition with local species for limited food and space resources, which directly leads to the degradation or even extinction of local species.

The reason is that they accidentally reach a new environment without natural enemies or other biological restrictions, so they spread quickly and cause disasters.