Qingdao suffered the largest invasion of Enteromorpha in history, and the coastline turned into grassland instantly. What is the cause of this phenomenon?

When Enteromorpha enterica occurs, a seaside in Qingdao instantly turns into a grassland. Men are paddling in the waves of green vegetation, and dogs accidentally wander into it and run happily, creating an alternative landscape. At the mouth of Jiaozhou Bay in Qingdao and the Yellow Sea, green Enteromorpha invades the sea like a green carpet. Qingdao City promptly and accurately assesses the development trend of Enteromorpha, and adopts intensified efforts to intercept, salvage, and clean up the Enteromorpha to ensure that Enteromorpha attacks once and effectively clean up the Enteromorpha to keep the coastline clean. So what is the reason that caused Enteromorpha to become the tragedy of Qingdao overnight? What happened in 2007?

People discovered that there were some other things mixed in the Enteromorpha... bamboo poles. Where did the bamboo poles come from the sea? Investigations continued toward the root of the problem, and it was discovered that since 2003, the scale of seaweed farming along the coast of northern Jiangsu has expanded rapidly. Farming seaweed requires inserting many bamboo poles as supports in the coastal shoals. Not only does seaweed grow on these farming rafts, , and also become a suitable place for the growth of Enteromorpha prolifera. Every spring, when seaweed is harvested in large quantities, the green algae attached to bamboo poles and hemp ropes are manually cleaned up. There are at least 16,000 tons of them every year, and nearly 40% of them are enteromorpha. As the tide surged, the green algae on the beach was swept into the sea again, and with the action of ocean currents and sea winds, it began a long expedition

In the hinterland of the South Yellow Sea, due to the two provinces of Jiangsu and Shandong The eutrophication of water bodies caused by the discharge of industrial and agricultural sewage just provides space for these green algae to explode. Under sufficient sunlight, by late May, continuous patches of Enteromorpha have been produced, and soon after, patches of Enteromorpha The enteromorpha enteromorpha will come to the coast of Shandong Peninsula, eventually leading to the enteromorpha enteromorpha disaster in Qingdao (and surrounding counties and cities). The Enteromorpha that has not floated to the shore may sink to the bottom of the sea and become the "seed" of the Enteromorpha disaster in the next year. Enteromorpha that drifts to the coast robs a large amount of oxygen in the water, affecting aquaculture; or accumulates in large quantities on the coast, destroying the coastal landscape; under the scorching sun, Enteromorpha will rot and produce an unpleasant smell. Why is it that we can never finish harvesting Enteromorpha prolifera every year?

Because they have super reproductive capabilities. During the growth of Enteromorpha prolifera, some cells will develop into gametocysts and release gametes. The gametes are divided into male and female, and have flagella on the outside. ?After the union of a male and a female, the zygote is afraid of light and will sink to the bottom of the sea to find something to grab and fix, and then start to grow. Here's the interesting thing. If the gametes of both sexes are not united, the flagella will fall off, the embryo will sink and grow, and it will start to grow asexually. Then after the first reproductive zygote grows, it will release spores, and the spores will also grow and develop later.

Part of the mother body of Enteromorpha can also divide and grow into new Enteromorpha. So scary. The complex life history + various reproduction methods + stronger nutrient absorption capacity and photosynthesis efficiency than other algae allow Enteromorpha to gradually reproduce from spring to summer every year, and then cover the entire sea surface. People only saw them when the green tide broke out and they were everywhere. Their complex life history and the principle of their rapid population growth have yet to be further studied. Enteromorpha is dynamic, and the sea surface drifts at any time according to the action of wind, waves and currents

Specialized maritime law enforcement ships patrol, study, judge, command, and dispatch offshore fishing boats for precise salvage. Three lines of defense have been set up at sea to reduce the landing rate of Enteromorpha Enteromorpha. The most feared weather is strong winds, waves, fog, and swells, making it difficult for fishing boats to move, while Enteromorpha poses risks near the shore. At present, Qingdao uses satellite remote sensing, helicopters, maritime cruises, near-shore monitoring stage trackers and other means to increase monitoring and forecasting and comprehensive information analysis, timely adjust the maritime interception force, optimize the near-shore interception network, and fully implement the maritime interception of Enteromorpha Enteromorpha. Enteromorpha can be used as medicine and is good for smokers; it is rich in protein and can be eaten. The excess is turned into waste and is mainly used to make seaweed organic fertilizer for commercial crops and flowers.