Examples of biological invaders? About 300 words?

Fushou snail, also known as large bottle snail, apple snail, is native to the Amazon River basin in South America. It was introduced to China in 1981 as an edible snail, and has become a harmful invasive alien species because of its strong adaptability and rapid reproduction. The most recognizable feature of the snail is that the female snail can lay a "pink egg mass" on the surface of a solid object above the waterline.

Fushou snails eat a large amount of food, and biting rice and other agricultural plants can cause serious yield reduction, and it is a veritable rice killer. In addition, the shell of the snail is sharp, which is easy to scratch the hands and feet of farmers, and a large amount of feces can pollute the water body. Because each female snail can lay about 10,000 eggs per year, the reproduction is amazing, which can cause the extinction of other aquatic species, and it is very easy to destroy the local wetland ecosystem and agricultural ecosystem It was introduced to China in 1981.

Its meat is delicate and delicious, rich in protein, carotene, a variety of vitamins and minerals, is a delicacy on the table, due to the low fat content, is a high-quality tonic for patients with high blood pressure and coronary heart disease. In addition, it is also the feed for some valuable aquatic animals. Fushou snails are large, have a wide range of eating habits, strong adaptability, fast growth and reproduction, and high yield, and are cultivated all over China.

Eating insufficiently heated snails may cause infection of parasites such as Angiostrongylus cantonensis in the human body. In China, a South American aquatic plant, water hyacinth, has greatly reduced the water area of Dianchi Lake in Kunming, and the local climate is obviously dry, and 38 of the 68 species of fish in the lake have ceased to exist. According to conservative estimates, the area of serious occurrence and damage of forest invasive insects such as pine wood nematode, wetland pine mealybug, pine scale, American white moth, pine scale and other forest invasive insects has reached about 1.5 million hectares in China every year.

In recent years, 1.4 million to 1.6 million hectares of agricultural invasive insects such as rice weevil, American spotted diver fly, potato beetle, and African giant snail have been seriously affected every year. The annual economic loss of agriculture and forestry caused by alien species reaches 57.4 billion yuan, the cost of control of the American spotted submarine fly alone is 100 million yuan, and the annual cost of salvaging water hyacinth needs to be more than 5-1 billion yuan. The terrible invasive species that ravaged Chongming Island in Shanghai - Mutual Rice Flower, because of its sand fixation and siltation effect, was introduced from the United States 20 years ago, due to the lack of natural enemies, Mutual Rice Flower Grass has now become the absolute overlord of the entire Chongming Beach, resulting in a large number of fish and shellfish due to lack of food, and the aquaculture industry suffered fatal trauma, and the biological chain break directly affects the survival of birds on the island that feed on small fish, "If it is not controlled, the biological chain of Chongming Island will be seriously broken."

Spartina alterniflora is now spreading in large numbers along the coast of Fujian Province, and the death of large mangrove forests along the beach is the result of Spartina alterniflora.

Place of invasion: New Orleans, Louisiana, USA.

Intruder: Termites.

Method of infiltration: Originated by a signature.

In New Orleans, USA, exotic termites roam the entire South, destroying homes along the way. Biologist Claudia Riegel and other experts suspect that these alien termites traveled from half a world decades ago. It all started with a signature.

Half a century ago, in Tokyo Bay, Japan, American General MacArthur was presiding over the defeat and surrender ceremony of Japan in World War II. U.S. troops stationed in Japan and China packed their bags and prepared to return home. They use local wood to make crates.

In the end, the crates were dumped in a garbage dump near a military base in the South. However, a discarded wooden box is not necessarily empty. It is likely that there are stowaways hidden in the wood.

An exotic species: Taiwanese milk termites.

Over time, the litter of dangerous termites increased dramatically. But no one knew that termites were here, let alone how capable they were. Insects may be small, but a large number of insects can form a terrifying destructive force.

Termites that invade New Orleans have been lurking for years. But from the 60s of the 20th century, New Orleans began to be shrouded in gloom. There are termites everywhere, and sometimes they can't even walk.

They pounce on the faces and mouths of the locals. When termites lay eggs, the eggs get tangled in people's hairs and are everywhere.

1.Water hyacinth multiplies in large numbers in China.

2.Goldenrod.

3.Fushou snail.