Species invasion as the title Thank you, the case of invasive alien species

Biological invasion has become a global topic, and we should always maintain a high degree of vigilance when facing invasive alien species, and remove them from the environment in time to avoid serious damage to the local environment.

The water hyacinth, which once grew wildly, to the big white moth that damaged serious trees, and then to the scavengers and crayfish, these are all invasive alien species. Moreover, the invasion of each species has brought a serious impact on the local area and even the whole country. After discovering unknown species, many people will find them novel and become interested in them.

And in the case of good intentions, they will be released in the same way.

As everyone knows, their "kindness" has caused serious damage to the local ecological environment. Many times, these species, because there are no natural predators, go on a wild reproduction.

Therefore, if you want to protect the environment, you need to put an end to biological invasion, and the best way to protect it is not to release unknown organisms into the natural environment in the wild.

The second attitude: actively eradicate alien speciesFor some species where biological invasion is rampant, I think we are all familiar with it; So when we see this kind of species that are put into the species by "well-wishers" in our lives. They should be eliminated in time, or taken out of the wild to avoid biological invasions.

There were once people who wanted to buy tortoises to "do good deeds" for themselves; However, after many releases, it is always found that the tortoises still crawl back to shore.

It can be seen that many people who are keen on animal release are very lacking in even the most basic common sense of animal release; What we can do is not to release animals at will, and to discourage some people around us from releasing animals at will.

Try to resist it, I remember watching a science program before, water hyacinth is a foreign species, there are no natural enemies after coming to China, so a large pond grows it, it will affect the effect of your fish pond, and may even cause the fish in the pond to die, so don't bring it back, you must boycott.

I think we should be vigilant, many people think that it is good to eat these invasive species, this idea is very one-sided, species invasion will have an impact on our ecology, and this impact is difficult to reverse if it expands.

We should have a rational attitude and must not allow invasive alien species to grow arbitrarily, because this may have an adverse impact on our country.

No matter what the species, we must have a comprehensive understanding of it, if it is good, it can be introduced, and if it is bad, it is not allowed to enter.

Because alien species may pose a threat to local species, invasive alien species should be resolutely resisted.

Handling should be resisted. Because invasive alien species can have a negative impact on the local ecology, they should be resisted.

In fact, we should have an attitude of extermination or repatriation, because they themselves will have an impact on our ecological environment.

Peace with each other on the premise of protecting human security is the only way to bring peace to the world.

Landlord, adopt me, there is no wealth.

Summary. More than 660 invasive alien species have been discovered in China, and their invasion pathways mainly include: natural invasion.

Biological hazards caused by natural migration of plant seeds or animal larvae through air movements, water movements, or insect and bird transmission; Artificial introduction is divided into intentional introduction and unintentional introduction. Among them, it is intended to be introduced for the purpose of viewing and so on. Inadvertently introduced is inadvertently introduced with the import and export of ** sea vessels or inbound passengers.

In addition, fruits, meat, and even shoe soles brought by inbound passengers will also become a route for the invasion of alien species.

More than 660 invasive alien species have been discovered in China, and their invasion pathways mainly include: natural invasion. Biological hazards caused by natural migration of plant seeds or animal larvae through air movements, water movements, or insect and bird transmission; Artificial introduction is divided into intentional introduction and unintentional introduction.

Among them, it is intended to be introduced for the purpose of viewing and so on. Inadvertently introduced is inadvertently introduced with the import and export of ** sea vessels or inbound passengers. In addition, fruits, meat, and even shoe soles brought by inbound passengers will also become a route for the invasion of alien species.

The main reason is that there is a gap in the legislative aspect for the time being. "One of the important reasons for the large-scale invasion and rapid spread of alien species is that China's legislation on the invasion of alien species is relatively lagging behind. "In order to solve and control the damage caused by invasive alien species to China's ecological environment and economy, it is urgent to establish a special law to control the invasion of alien species."

There are three pathways of alien species invasion: conscious introduction, unintentional introduction and natural invasion. For example, in the 70s of the 20th century, China introduced water hyacinth (water hyacinth) native to South America as pig feed, but water hyacinth has spread all over rivers, lakes and ponds in North China, East China, Central China and South China.

In the 1,000-hectare Dianchi Lake, water hyacinth has grown wildly, seriously damaging the structure and function of the aquatic ecosystem, and has led to the death of a large number of aquatic animals and plants. It is a natural invasion to be introduced by its own diffusion or with the help of natural forces, and microchamomile and American spotted diver fly are all invaded into China by natural factors. The unconscious introduction is the species that are introduced with activities such as **, transportation, tourism, etc., and the invasion of the American white moth belongs to this category.

Invasive species are found in all provinces, autonomous regions and municipalities in China, involving almost all ecosystems, from vertebrates and invertebrates to tall and low plants, as well as fungi, bacteria and viruses. Cao Aocheng, a researcher at the Institute of Plant Protection of the Chinese Academy of Agricultural Sciences, pointed out.

Invasive species have tenacious vitality and strong ability to spread invasion, and once introduced, they can spread rapidly, showing a "scattered J" type of population growth in a short period of time, which is correct. Although a population of an alien species to a new environment has tenacious vitality, the population growth is restricted by other organisms in the new environment, which is wrong. When a population of an alien species arrives in a new environment, the population continues to increase due to its strong adaptability to the environment, threatening the diversity of species in the new environment, right; An alien species to a new environment, the population does not adapt to the new environment and is eliminated, right, b correct.

Test site positioning] changes in population size.

Students are prone to confusion about invasive alien species.

The causes of the ecological crisis caused by the invasion of alien species: the empty ecological niche occupied by the sock digging section; Invasive species have tenacious vitality and strong ability to spread invasion, and once introduced, they can spread rapidly, showing a "J" shaped growth of the population in a short period of time. The environmental conditions of the relocation site are suitable; Invasive species are highly adaptable to the environment; Lack of control from predators.

In general, successful removal is beneficial to biodiversity, however, there is evidence that the removal of invasive species can have unintended impacts on native species and ecosystems without adequate planning, and that there are many types of unintended impacts. Excessive spraying of poisons on non-target organisms and the transfer of toxic substances to the food chain are all problems caused by the use of elimination. Some of these methods are unsuccessful because they have not completely eliminated the target organism, or because they have ignored the presence of the individual, or because they have not taken steps to reduce the likelihood of re-invasion after the re-elimination.

Ecosystem recovery may not be sufficient to remove invasive species, as some invasive species alter habitat conditions and make them unsuitable for native species. For example, in many places from the Middle East to the western United States, the invasive plants mesembryanthemum crystallinum and tamarixsppThis increases soil salinity, making it difficult for salt-sensitive native species to survive.

In such cases, clearance must be followed by additional means of habitat restoration.

Exotic tamarixsppShrublands have displaced much of the native riverside vegetation in the arid regions of the western United States, absorbing large amounts of water, narrowing waterways, salinizing soils, and degrading wildlife habitats.

Because Tamarix provides an important nesting habitat for an endangered local songbird, removal plans have been postponed again and again in parts of the area where it grows. The southwestern willow fly Empidomaxtrailiiextimus is currently down to less than 500 breeding pairs, and they have been inhabiting poplar (populusspp.) at the water's edge in the southwestern United Statesand willow (salixspp.).

Above. Urbanization, agriculture, fires, irrigation and grazing have all reduced its original habitat, and most of the remaining habitat has been replaced by Tamarix, which has reduced the reproductive success of the fly, but the flyer still needs to take advantage of the invader, which appears to be more suitable for other areas.

The gradual removal of Tamarix will be very beneficial to the flyer by giving native tree species a chance to re-colonize and provide a habitat for replacement. However, some areas invaded by Tamarix may no longer be able to grow native vegetation because water levels have dropped and the soil has become salinized, complicating the regrouping of native species as a result of Tamarix control. Regional waterlogging has prevented the regrowth of some native species, such as poplar, and has increased the likelihood of re-invasion of tamarix.

Managers believe that if planned and carefully restored, the removal of Tamarix will benefit the endangered flyer and other native species. However, inadequate planning of clean-up operations without steps such as irrigation and revegetation can fail, and in the process, endangered species can also be harmed.