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In 1988, the White Sturgeon, White Sturgeon, Chinese Sturgeon and Yangtze River Sturgeon in the Yangtze River were listed as national first-class protected animals. Now that the white sturgeon is gone, the current state of the Yangtze River biological system has once again aroused people's concerns. The Chinese sturgeon, which is also the flagship species of aquatic biodiversity conservation, is also in jeopardy.
The natural distribution of Chinese sturgeon runs through the upper, middle and lower reaches of the Yangtze River and offshore waters, and is a typical representative of aquatic organisms in the Yangtze River. Public data show that at present, the mainland has not monitored the natural breeding of wild Chinese sturgeon for 5 consecutive years. Wei Qiwei, a researcher at the Yangtze River Institute of the Chinese Academy of Fishery Sciences and known as the "father of the Chinese sturgeon", said, "The living conditions of the Chinese sturgeon continue to deteriorate. ”
In recent years, in order to save the Chinese sturgeon, many breeding and stocking activities have been carried out in various places. According to preliminary statistics, more than 8 million Chinese sturgeon have been artificially released since 1981. The problem, however, is that the natural reproduction of its wild populations remains unrecoverable.
Can we expect natural breeding of wild Chinese sturgeon populations?" This cannot be said to be an expectation, but we cannot sit still. Wei Qiwei said. According to reports, at present, the Chinese sturgeon has broken through artificial breeding and full artificial breeding, and the breeding unit has reached more than 20. In a sense, species can be preserved from extinction.
Wei Qiwei said that to prevent the extinction of Chinese sturgeon, the seed preservation project is the most critical. "These [Chinese sturgeon] artificial groups can't just be raised in small ponds, they have to go to the sea. After seed preservation, it is necessary to form effective reproduction. Breeding groups should exert more benefits and breed offspring. This is critical. ”
In recent years, Liu Huanzhang, a researcher at the Institute of Hydrobiology of the Chinese Academy of Sciences, has been monitoring the wild population of Chinese sturgeon in the Yichang section of the Yangtze River. "Through monitoring, we recommend that the spawning grounds be repaired." Liu Huanzhang said that the breeding of Chinese sturgeon has strict requirements for the environmental conditions of spawning grounds. After the construction of Gezhouba, the spawning grounds were limited to 3,000 to 5,000 sections downstream of Gezhouba. Researchers recommend that ecological scheduling be carried out during the breeding season to ensure the water temperature and flow required for breeding. Removal of the barrier embankment to restore the spawning area and topographic and geomorphological characteristics of the Chinese sturgeon; At night during the breeding season, close the spawning grounds across the river bridge, prohibit vehicle traffic and turn off the lights to avoid disturbing the breeding activities of the Chinese sturgeon.
The researchers also suggested that a national-level Chinese sturgeon conservation center should be established to focus on promoting species protection in a targeted and planned manner. At the same time, special research on the life history and key habitats of Chinese sturgeon will be carried out to eventually restore the wild breeding activities of Chinese sturgeon. Read the full >>>
After understanding the wild living environment of the aquatic Chinese sturgeon, let's take a look at the terrestrial plant giant konjac. Giant konjac is one of the three flagship species of rare and endangered plants in the world, the largest single inflorescence in the world, and the world's most smelly flower. It is extremely difficult for the troll to flower, only 3-4 times in a lifetime, and each flowering does not exceed 2 days.
On July 23, another giant konjac bloomed in the exhibition greenhouse of the National Botanical Garden (North Garden), less than a week after the previous flowering giant konjac. It is worth mentioning that the Tropical Exhibition Greenhouse of the National Botanical Garden (North Garden) is closed every Monday in principle, and this time it is temporarily open on Monday, July 25 in order to facilitate the viewing of giant konjac.
The giant konjac, which opened on July 23, is the last plant to bloom in the National Botanical Garden's giant konjac group, reaching a height of 1.84 meters, 16 centimeters taller than the previous one. The group flowering of giant konjac in the National Botanical Garden can be said to have set a number of records, including the first group flowering, the first publication of pollination videos, and the extension of the viewing period to one week, etc. The creation of these records has benefited from the scientific management and meticulous maintenance of the researchers of the National Botanical Garden.
In order to allow citizens and tourists to enjoy the world's top rare and endangered plants, the National Botanical Garden specially puts the giant konjac in the exhibition greenhouse for display. Some tourists do not understand that the giant konjac is already in the greenhouse, why build a small greenhouse alone?
This actually has a lot to do with the ecological habits of giant konjac. Trolls are native to the tropical rain forest of Sumatra, and their growth and flowering have higher requirements for the surrounding environment, especially for temperature and humidity, and the temperature needs to be between 26-28 degrees Celsius and the humidity is above 80%.
The third troll is expected to wave goodbye soon, which also announces the end of the world's first public display of the troll group. Although the National Botanical Garden (North Garden) already has a record of 6 giant konjac flowers, it is still a problem to accurately predict the next flowering time of the giant konjac. Read the full >>>
During the summer vacation, it is also the annual tourist season in various places, just a few days ago, "Hainan Sanya a room is difficult to find, Xinjiang Duku Highway 'blocked crying', the highest 50,000 special train tickets are slow and untouched" and other news once dominated the social platform. The resurgence of the tourism market, especially the popularity of self-driving tours, is also considered by many voices to be a symbol that our social life is on the right track.
However, according to the People's Daily health client, the spillover of the epidemic caused by self-driving trips in many places since July has involved many provinces and cities.
In the context of the Olmi kerong mutation is still raging in parts of the mainland, many places have reported that new outbreaks are related to self-driving travel, which obviously requires the attention of various localities, and timely targeted adjustments in epidemic prevention policies, and changes from time to time to respond to the new characteristics and new risk factors presented in the current epidemic transmission process.
As the relevant person in charge of the National Health Commission said at the press conference of the Joint Prevention and Control Mechanism of the State Council on July 21, the global epidemic has rebounded, the mobility of domestic personnel has increased during the summer, the risk of local epidemics in various places has increased, and the national epidemic prevention and control situation is still severe and complex. This also requires that all localities should further implement relevant epidemic prevention measures in light of the current situation, and continue to do a good job of "external prevention of import and internal prevention of rebound" in a scientific, accurate and effective manner.
It should be noted that it is recommended to do a good job in epidemic prevention for self-driving tours, which does not mean that self-driving tours should be one-size-fits-all. All localities should not use this as an excuse to increase the number of layers to prevent the normal passage of self-driving tourists, but to upgrade the response plan according to local conditions, make the epidemic prevention strategy more targeted, and more scientifically, accurately and effectively balance the demand for self-driving travel and epidemic prevention safety under the requirements of the "nine no's". Read the full >>>
On July 23, Chinese ushered in the heat of the twenty-four solar terms. "Summer" means hot, and the summer is the ultimate heat, the strongest and hottest solar term of the year, accompanied by humid and rainy weather. According to the forecast of the Central Meteorological Observatory, many places on the mainland will continue to have high temperature weather, and the local area can even reach 40 degrees Celsius.
The same is true abroad. At least 1,700 people in Spain and Portugal have reportedly died from the heat in Europe, which continues to be affected by extreme heat weather; Forest fires in the United Kingdom, France, Italy and other countries are also directly related to this.
There are also many unusual details along with the weather changes, and according to media reports, the ice sheet of Arctic Greenland is melting in a large area. Between July 15 and 17, 6 billion tonnes of ice were lost each day, enough to fill 7.2 million Olympic-size swimming pools.
According to the natural cycle, summer is also the melting season of Greenland's ice sheet. However, the melting of the Greenland ice sheet this summer has been particularly rapid. On July 19, Greenland's temperature was approaching 60 degrees Fahrenheit (about 15.5 degrees Celsius). Because the temperature anomaly caused the ice to be soft, the plane could not take off and land normally, so that some researchers stayed in the local area, and even wore shorts to play volleyball and short-sleeved shirts to go out.
The "steaming" model, which has been widely opened around the world, has once again put the issue of global climate change in front of mankind. The consequences of increasingly hotter weather will be mainly reflected in the generation of stronger and longer heat waves, more prolonged droughts, more wildfires and more extreme rainfall. All of this can have a serious impact on human life, even disasters.
Moreover, if the trend of global warming is not controlled, future high temperatures will increase and continue. In the face of this situation, governments, and even everyone, have a responsibility to contribute to the mitigation of global warming. Read the full >>>
Monkeypox is generally endemic in West and Central Africa, but many countries and regions outside these regions have reported monkeypox cases since May. On July 23, local time, the World Health Organization declared the monkeypox outbreak to constitute a "public health emergency of international concern".
According to foreign media analysis, this rare determination means that WHO believes that the monkeypox outbreak poses a sufficiently large threat to the global health situation and requires a coordinated international response to prevent further spread of the monkeypox virus and possibly escalate into a pandemic.
An international team of researchers led by scientists at Queen Mary University of London reported in the New England Journal of Medicine on July 21 that researchers analyzed 528 cases of monkeypox reported in 16 countries from April 27 to June 24 this year, and found that 95% of these cases were sexually transmitted. Of these cases, 98% were gay or bisexual men, and 41% were infected with the human immunodeficiency virus (HIV). The median age of patients was 38 years.
CNN reports that children have been diagnosed with monkeypox virus, meaning anyone can be infected with monkeypox virus due to close skin-to-skin contact. In the case of children, the U.S. Centers for Disease Control and Prevention says that monkeypox virus infection in children is spread through "intimate contact behaviors such as cuddling, as well as sharing items such as towels, bedding, cups and cutlery."
According to Xinhua, some experts worry that declaring the monkeypox outbreak a "public health emergency of international concern" could inadvertently exacerbate the vaccine battle, exacerbating existing health inequalities in rich and poor countries. Many wealthy countries have stockpiled vaccines in large quantities, although the symptoms of monkeypox cases found in these countries are relatively mild.
The WHO Regional Office for Africa has also previously said that the supply of monkeypox vaccine is insufficient at this stage, and recommends vaccination for groups in high-risk environments, such as health workers who trace close contacts of cases. Read the full >>>
Edited by Ai Zheng Liu Zhe Design Jia Chenchen Proofread zhao lin