Invasive alien species in Guangzhou

Brazil turtle, happy grass (also known as Canada goldenrod), scavenger ... These are currently the largest flower, yangcheng aquatic product market horizon hot selling should be harmful invasive alien species. They once from the garden and Aquarium escape out of the box ", suitable for living environment, extensive breeding unceremoniously devour the living environment of the local species, and thereby to Guangzhou local biological diversity pose serious threats.

Guangdong affected by serious exotic species invasion because Guangdong foreign exchange and foreign trade more frequently, with most areas warm climate, suitable for the growth of the species are relatively large, which makes the Guangdong become fragile area of alien plants.

Three ways of penetrating the invasion:

Current invasive species invade there are three main ways: the first is intended to introduce. Some individuals or bodies for reasons of economy, landscaping, ornamental purpose such as the introduction of alien species, the last flood. For example, when a pig feed and the introduction of water hyacinth, later found it was crazy and propagation, causing clogging River, influence domestic water, breeding mosquitoes and flies.

The second is accidentally introduced. Usually with the people and products through the aircraft, ships, trains, automobiles and other means of transport, as stowaways were introduced to the new environment.

The third is the natural fall. For example, plant seeds move into the wind or river to the other places, or bird eaten back to another place. Aircraft grass and plants is to rely on the natural factors of intrusion into our country, now give Yunnan and Guangdong.

Losses: annual eat Guangdong billions

According to experts, a conservative estimate, the annual exotic species invasion to Guangdong Province caused economic losses of up to several billion dollars. But once the invasion success of alien species, it is extremely difficult to eradicate and control the cost of the harm.

Typical of invasive alien species

Scavenger: swallow has dominated the Pearl River or Creek four

Photo scavenger

Origin: Latin America omnivorous fish

Invasion history: "scavenger" for General Home fish people should not strange, because it looks quite the "honest" and into the fish eat Aquarium box with junk the habits of dung, can save people the trouble of cleaning fish tanks. Many people are fond of it as ornamental fish kept in fish tanks. But later found it kept growing fast, and will eat the same tank culture of small fish, loses it's favour. Some people figure it directly into easily in the Pearl River field, making them able to field of the environment to multiply, and gradually erode the growth of the Pearl River basin of four, has dominated the tributaries.

Hazard: according to Guangzhou fishery detachment Zou Rong-introduction to natural enemies in the Pearl River not scavenger and its propagation ability is strong, can produce 300 ~ 500 tablets of eggs, all the eggs hatch into almost all can fish, grew into the scavenger generally after long 20 ~ 30 cm long, probably to a second burden. Zou Rong ya say, because this scavenger is omnivorous fish can eat anything, including water waste and some small fry, propagation very fast, it is the most terrible aspect is the ability to swallow fish eggs, serious prejudice other species propagation.

It is reported that in the Pearl River basin has been stressed by the abundance, Zou Rong ya that morning when I often see those "urban fisherman" at the river fishing, catch many head flat tail long, ugly zuijian like black "strange fish", are actually scavenger. Sometimes, some cleanup of the Pearl River water sanitation team, just a fishing can gain many scavenger. Now, particularly from the white goose pond waters to Huangpu Hong Kong waters this freshwater is already a scavenger of "world", four have been eaten. However, there is currently no effective means to control the spread of scavenger continue.

Brazil turtle: multiply force Super accelerated local turtle extinction

Map for Brazil turtle

Origin: South America

Invasion history: Brazil turtle, in Guangzhou, almost all of the pet market can see it. However, this best seller in Guangzhou, the family pet is already

Global invasive species, was the World Conservation Union as one of the world's most dangerous one of 100 alien species.

Recently, this reporter visited fangcun Aquarium market, Brazil turtle see when prices are low, 10 Yuan to trading and to attract many people to buy. It is one of the booth, every day to buy Brazil turtles of many children and young people to buy a home as a pet, but also the elderly buy back set free for a mythical figure Kili.

Hazard: the power of the small charming "but don't underestimate. According to experts, Brazil turtle but true "eco-killer". It is reported that Brazil turtle on food and environment requirements are not high, strong environmental adaptability, growth, reproduction and strong, predator. If it just released to the wild rivers and lakes, there is no natural enemies, because basic would snatch the local turtles, tortoises threatened local food and its related species survive on their ecosystem chain cause great damage. Especially adapted to Brazil turtle once the local environment, to extensive breeding and exclusive local freshwater turtles, to accelerate local turtle extinction process. In Taiwan, Brazil as a pet turtle introducing non to 20 years, but had to settle in Taiwan to build communities, a reproduction of Taiwan most common turtle species. Local wild Brazil turtle will prey on small fish, shellfish and frogs ' eggs and tadpoles, causing local ecological catastrophe in water, such as the Taiwan of Keelung River has long been Brazil turtle "dominate". Experts, Brazil more than local Turtle Tortoise has advantages, such as native tortoise to the age of seven began to "sexual maturity," but because Brazil turtle two-year-old has spawned, it is also a cheap Brazil turtle.

Happy grass: once around the flowers knot

Plant extinction

Figure for happy grass

Origin: Canada, also known as Canada goldenrod, yellow niao or goldenrod

Invasion history: "the plant killer," said the Canada goldenrod, flower called happy grass, it flowers very small, Scorpion caudate arranged, then combined into the large yuanzhuihuaxu, bright color, has become the largest florist yangcheng mainly with flowers, is very popular.

Hazard: surface looks weak weak "small yellow" should have a strong ability to reproduce and noninfringement, can undermine the growth of other plants, known as "plant killer" and "Overlord flower".

According to reports, the vitality of the grass happiness is so strong that a flower can form more than very small seed particles, they can even as like dandelion seeds in the wind. If people don't accidentally brought seeds of flowers in the desert to the wild barren land, it is possible to enable them to root. Due to the lack of natural enemies, "the little yellow" propagation very quickly, therefore occupy its growth area for the survival of other species to be extinct. According to reports, a flower shop in the sale of the flower buds just starting to bloom, temporarily not much threat. Once the flowers fall, knot, the seed in contact with soil, they will rapidly spread in rooting out to seriously damage vegetation in the region, on the ecological environment and species pose a serious threat to the security will be. Therefore, like to buy home placed in the public view, do not arbitrarily discarded because it may dump is born out of the 10 acres.