The main cause of red tide is environmental pollution. With the rapid development of modern chemical industry and agricultural production, the population of coastal areas has increased, and a large amount of industrial and agricultural wastewater and domestic sewage have been discharged into the ocean, the main cause of red tide. The explanation is as follows:
1. After industrial and agricultural wastewater and domestic wastewater are discharged into the ocean, nitrogen, phosphorus and other nutrient salts in the ocean increase significantly, causing water eutrophication. seawater and creating an environment for red tide organisms. Mass reproduction provides sufficient food and an environment of suitable water quality. Additionally, the development of offshore aquaculture has also increased the likelihood of red tides.
2. Besides pollutionof the environment, climate change is also one of the causes of red tides. Climate change will affect the marine environment, causing changes in seawater temperature, salinity and other factors, creating favorable conditions for red tide organisms to reproduce. At the same time, climate changes such as global warming have also exacerbated the frequency and severity of red tides.
3. Human activities also have an impact on the occurrence of red tides. Various human activities on land and sea, such as engineering construction, shipping, aquaculture, etc., can change the natural state of the marine environment, creating conditions conducive to the occurrence of red tides. For example, the seafloor substrate may be damaged during project construction, making it easier to release nutrients into the seawater./p>
The harms of red tide
1. Destroy the marine ecological structure: The occurrence of red tide causes algae and other plankton to multiply in the ocean, thereby changing the structure of the ocean ecosystem. This change will lead to the death and reduction of marine life and destroy the balance of the marine ecosystem.
2. Affect the survival of marine life: The occurrence of red tide leads to a decline in the oxygen content of the ocean and eutrophication of seawater, which will lead to the death and reduction of marine life. Some fish, shellfish and other marine organisms die due to lack of oxygen, thereby affecting the survival of marine organisms.
3. Threat to human health: The occurrence of red tide will also produce toxic substances, which may pose a threat to humans and other organisms. For example, some red tide organisms secretent toxins and people may experience symptoms of poisoning after eating seafood containing toxins.