With the development and progress of the times, especially in the past half century, the way of life of human beings can be said to have undergone earth-shaking changes, especially after entering the 21st century, human activities have become more and more frequent, and the rapid development of logistics and transportation has also allowed many species to follow human beings to go farther.
For example, in the recent period, China's customs found a large number of overseas sent over, which contains packages of black-bellied fruit flies, which can be said to be obviously the invasion of alien species, so where do these black-bellied fruit flies come from? Why do they send so much to our country?
What is Drosophila Black??
When it comes to fruit flies, I believe that friends will not feel strange, when we usually buy some fruits, and some of them have not had time to eat, resulting in decay, we will find that there will be some fruit flies on it, and the black-bellied fruit fly is also one of the fruit fly species, but compared to other fruit flies, the black-bellied fruit fly is the most thoroughly studied and understood by humans.
From the distribution point of view, the black-bellied fruit fly was not a global distribution at first, its origin is in the tropics, subtropical regions, but now, with human activities, the black-bellied fruit flies have long been all over the world, and they are a very intelligent animal, and when the climate is reduced, they will hide in human homes, hide in the corner for winter.
So why do scientists know so much about the black-bellied fruit fly? What are their research values? Speaking of which, the earliest discovery of drosophila melanogaster was made in 1830, but for some reasons, scientists did not conduct more in-depth research on drosophila for more than 70 years.
It wasn't until the beginning of the 20th century, in 1901, that scientists (William Ernest Castle) officially began to study Drosophila nigris, and then because of their ease of cultivation and incredible reproduction rate, other scientists also began to study them.
Scientists have found that Drosophila melanogaster has 4 pairs of chromosomes, one of which is a sex chromosome, but they contain very few genomes, and through the hybridization of Drosophila melanogast, scientists have also bred new varieties of Drosophila melanogast, such as the inability to fly, with miniature wings, and the eyes become white, but can still see the outside world of The black-bellied Fruit Fly.
Over the years, through the study of the black-bellied fruit fly, many researchers have won the Nobel Prize for it, and it can be said that this small insect, which looks very inconspicuous, has made great contributions to the field of human biological research.
Why is the black-bellied fruit fly seized by customs?
However, although the scientific research value of the black-bellied fruit fly is still relatively large in the world, however, we all know that everything has a degree, which means that there are too many black-bellied fruit flies and it is not a good thing.
Because Fruit flies are currently mainly used for scientific research, this also leads to the process of genetic mutation research, they may be infected with many pathogens in the experiment, and the black-bellied fruit flies that carry the variable genes, once they enter the natural world, will be hybridized with other fruit flies, resulting in some serious consequences.
For example, for China's fruit industry planting, it is very harmful, so China's customs will seize these black-bellied fruit flies, after all, these black-bellied fruit flies are mixed in other items into our country, they are also from unknown sources, if the regular experimental institutions want to import some black-bellied fruit flies for scientific research, there will also be declarations, and handle the formal process procedures, and these black-bellied fruit flies do not go.
It is conceivable that these black-bellied flies are introduced, there should be other purposes, and the final delivery address is not real, likewise, the sender's address is also false, in the absence of formal procedures, there is every reason to suspect that these black-bellied fruit flies may carry unknown pathogens.
How terrible is the invasion of alien species?
According to the "List of Invasive Alien Species in China" released by China in June last year, it can be seen that the number of alien species invading China today has reached more than 660 kinds, and more than 10% of them have constituted or are likely to pose a great harm to the natural ecosystems of some parts of China.
For example, in recent times, because of the heavy rain, so in many places in Shenzhen, China, you can see a large snail on the roadside, this snail looks like a harmless human and animal, in fact, they are an invasive alien species - African large snail.
Many people buy it as a pet, and then after keeping it for a while, they release it for some reason, and at the beginning, because this snail is very viable and the reproductive ability is also amazing, so their number is growing geometrically, and they still have a snail with a large number of pathogens and bacteria in the body.
Once it is taken home to eat without knowing it, or in close contact with it, it may cause illness, and in severe cases, it may even endanger life.
From here, we can see how terrible invasive alien species are. And in addition to potential threats to humans, invasive alien species can also damage the ecological environment.
We all know that it takes a very long time for an ecosystem in any place to form, and in general, it takes at least hundreds or thousands of years to stabilize the species that live in it, to contain each other, and to rely on each other.
However, when there are invasive alien species in a place, this stable situation will be broken, because in a stable ecosystem, there is no other space for alien species, which leads to the alien species playing the role of an invader, if it is not strong in itself, the adaptability to the living environment is not too strong, once the adaptability is very strong, and there is no natural enemy, the local ecological environment will be broken.
This will lead to the local species diversity will also be destroyed, serious may lead to the extinction of some species, and it will be very difficult to recover in the future, so not only the black-bellied fruit fly, but also other exotic species, each species has its own habitat, artificial change, will only lead to catastrophe.