The drought in the Yangtze River basin has a great impact on Poyang Lake. Not only humans, but animals are also affected by the continuous drought, especially Yangtze River finless porpoise.
html On September 3, some netizens discovered a dead Yangtze River finless porpoise on the north shore of Poyang Lake. The finless porpoise was found on the beach in the lake area with reddish-brown bloodstains around it. The cause of death is temporarily unknown. The body has been transported by the Jiangxi Agriculture Department. Go, hoping to find out the cause of death from this dead body.
It is understood that this finless porpoise is the seventh finless porpoise to die in the Poyang Lake water system this year. Whether the deaths of these finless porpoises are coincidences or accidents requires in-depth investigation.
Poyang Lake reverses drought during flood season
Poyang Lake is a typical lake within a lake. During the flood season in previous years, the lake surface area of Poyang Lake became larger and reached its peak. From a distance, it looked as wide as an "ocean". The water level drops during the dry season, but the deep water area still retains water deep enough to provide habitat for Yangtze finless porpoises, fish, etc.
During the dry season, Poyang Lake will turn into a "migratory bird paradise". About 400,000 to 800,000 migratory birds come here to spend the winter every year. The reason for this is Because the structure of the lake in Poyang Lake causes the water level to become low during the dry season, a large number of shoals are exposed. The fish, shrimps, snails, clams and other aquatic organisms in the shoals can survive for water birds; the roots, plant seeds, young leaves, etc. in the shoals can also be used for water supply. Herbivorous birds survive.
Poyang Lake has returned to dryness during the flood season this year. Among them, the water level at the key point of Poyang Lake, "Xingzi Station", is only 7.99 meters, falling below 8 meters. This marks that Poyang Lake has officially entered the extremely dry water position, and this has a great impact on local organisms. Large, this is mainly reflected in the following three points.
- The water level dropped rapidly
Although the water level also dropped during the dry season in the past, the rate of decline was not fast. However, due to the impact of high temperature and drought this summer, the water level of Poyang Lake dropped rapidly, with an average drop of about 15 centimeters per day.
The bottom of Poyang Lake is not flat land, but has many small puddles. When the water level drops, some fish, shrimps, snails, clams and other organisms that are too late to evacuate will be trapped in the small puddles.
Affected by high temperatures, the water temperature in small puddles rises significantly, and small puddles continue to evaporate. In a few days, fish, shrimps, snails, clams and other organisms in small puddles will not be able to survive and will eventually die.
The Yangtze finless porpoise will also face such a threat. The Yangtze finless porpoise is large in size and will come to shallow water areas in order to find food. The water level drops quickly, making it easy for them to become stranded. In order to prevent finless porpoises from becoming stranded, the local area has stepped up patrols. Once a finless porpoise is found stranded, it will be Return them to deep water with enough help.
- Affects the reproduction of fish and shrimp
In previous years, the flood season was the breeding season of fish and shrimp. Fish like to lay eggs in shallow water areas with lush aquatic plants. The complex terrain here is conducive to avoiding the foraging of natural enemies, and at the same time, it can provide sufficient food for the young.
Poyang Lake has returned to dryness during the flood season, which has not only reduced the number of places for fish to breed, but also caused their population density to be too concentrated due to the drop in water levels. Many of them are trapped in small puddles and have died in large numbers. Waterbirds also Predating them in large numbers has resulted in a decline in the number of fish and shrimp.
It was observed locally that a large number of egrets gathered in a small puddle that had not completely dried up. For the egrets, it is a good thing that the flood season will dry up, but it is a bad thing for fish, shrimps and Yangtze finless porpoises. Fish and shrimp are more likely to die, while Yangtze finless porpoises are at risk of starvation.
In order to protect the Yangtze finless porpoise, the local government has carried out supplementary feeding in the areas where the finless porpoises roam. The Poyang County Agriculture and Rural Affairs Department released 1,200 kilograms of live small fish into the Poyang Lake finless porpoise core reserve to provide timely food supplements for the finless porpoises.
- Aquatic grass grows premature
Poyang Lake water level has exposed a large number of lake areas. Now these places are already known as " The lake area becomes a grassland. "
Poyang Lake enters the dry period in advance. For wintering migratory birds, it may face the problem of food shortage, because the winter migratory birds eat tender stems. Nowadays, water plants have begun to grow. In winter, water plants are fibroburated and migratory birds are difficult to feed.
, and now the water level of Poyang Lake has fallen, the water level will decrease at the time of withering. The area for the life of the winter migratory birds will be reduced.
is so difficult for the Yangtze River porpoise to live during the flood season. The survival pressure facing in the dry period will increase, which may lead to the return of the Yangtze River pills to the main lake area to live, and the shipping in the main lake area will also affect its further survival.
summarizes
for the Yangtze Relief, drought has a great impact on it, but drought is not completely waterless in Poyang Lake. There is still a large lake area that can act as its shelter. Although
drought will affect their survival and even make their lives difficult, the drought of will not cause them to extinct , and this year my country has made many measures to ensure that porpoons can survive better, such as:: Make up, patrol, and investigate items that may scratch porpoons.
is still relatively rare in history like this flood season. If the future climate can be normal, plus human protection, porpoises may reproduce the vitality of the past and even from endangered.
