"Red tide" is an anomaly in marine ecosystems. It is caused by the explosive proliferation of red tide algae in the seaweed family under specific environmental conditions. Seaweed is a large family, except for some large seaweeds, many of which are very small plants, some of which are single-celled organisms. Depending on the species and number of organisms that trigger red tides, seawater sometimes takes on different colors such as yellow, green, and brown.
How red tides are formed
Red tide is a natural disaster, it is the explosive reproduction of some tiny plankton in the sea or high concentration caused by the discoloration of water, red tide has many colors, including red, green, brown and so on. The mechanism of red tide formation is very complex, which is the result of the combination of biological, meteorological, hydrological and other factors.
The formation of red tide and the eutrophication of water bodies in the sea are related, with the development of urbanization and industry and agriculture, many of the industrial and agricultural wastewater and domestic sewage discharged into the ocean have a large amount of organic matter and rich nutrient salts, which lead to eutrophication of water bodies, pollutants are difficult to be diluted and diffused, and red tide is formed. In addition, many areas with high mariculture density will also have eutrophication of water bodies because of their own pollution, and red tides may also form.
In addition, there are more than 330 kinds of plankton that can form red tides in the ocean, and there are about 150 species in China's coastal waters, and these plankton breed in large quantities will also lead to red tides.
The reason for the formation of red tide is also related to water temperature and salinity, different sea areas and different types of red tide, the requirements for water temperature and salinity at the time of their outbreak are different, in general, the sudden increase in surface water temperature and the sudden decrease in salinity will lead to the occurrence of red tide. If it is some of the more closed bays, the water exchange is relatively weak, then there will usually be red tide after the rain has passed.
How red tide is formed, what are its hazards
The formation of red tide and the eutrophication of the sea water body, with the industrial and agricultural wastewater and domestic sewage discharged into the ocean in large quantities, the nutrient elements in the marine water body increased sharply, resulting in eutrophication in the sea area, and the content of various trace elements and organic compounds was greatly increased, resulting in a large number of red tide organisms multiplying, resulting in the phenomenon of red tide.
Changes in seawater temperature and salinity can also cause the appearance of red tides. Usually, the sea temperature of 20 to 30 ° C is more prone to red tide, while the salinity in the range of 26 to 37 will be prone to red tide. If it is in some enclosed bay areas, due to the weak water exchange, it is more likely to occur after rain and sunshine.
In addition, the most indispensable factor for the formation of red tide is the red tide organisms, there are more than 330 kinds of plankton that can form red tide in the sea, the reason why red tide occurs is because of environmental changes that make red tide organisms gather or reproduce in large quantities. There are more than 150 kinds of red tide organisms in China's coastal waters, so there are often red tides.
What are the dangers of red tide
The emergence of red tides will lead to the destruction of the originally balanced ecosystems of the ocean, and red tides will change the surrounding environment, resulting in the inability of some marine organisms to grow, develop, reproduce normally, and even cause the death of some marine organisms.
The appearance of red tides can also destroy the bait base of fisheries, causing the fishery to reduce production. In addition, the large number of red tide organisms will lead to mechanical blockage of economic biological lobes such as fish and shrimp, causing these organisms to suffocate and die, and may even be poisoned because the red tide body or metabolites contain toxins.
Source: Tiger Vision Quest hushitm.com/kjzs/20211014/201327.html