How did alien species come in?
In recent years, China's ecological environment has been seriously disturbed by alien species, and the well-known crayfish, water hyacinth, Fushou snail, crocodile eel, etc. are all exotic species, how did they enter China?
There are three main forms of channels for these overseas visitors to smuggle in and out:
Natural invasion: natural migration occurs through the flow of air, water, or by insects and birds carrying plant seeds and animal larvae. China has a long border line and coastline bordering mountains and rivers, which cannot be avoided but also does not account for a large proportion.
Artificial intentional introduction: For the purpose of improving species reproduction, for ornamental purposes, making feed, etc., sometimes actively introduce alien species, which shows that alien species are not necessarily harmful. Of course, some people enter China deliberately and deliberately because of ignorance or knowingly introduce some harmful living creatures to evade inspection.
Artificial unintentional introduction: This mainly refers to the import and export trade of sea vessels or inbound passengers inadvertently carried by the introduction. Such as the loose nematode brought in in the wooden packaging box of imported equipment. Fruits, meats, and even soles of shoes brought by inbound travelers can become a pathway for invasive alien species. This is the main way for alien species to invade.
Of course, dealing with the invasion is not helpless, first, strengthen legal publicity to eliminate subjective carrying and punishment of malicious evasion; Second, customs, inspection and quarantine and border inspection can block most foreign objects from outside the national gate. #Exotic Species #How scary are the "water monster" alligator eel #
