A paper published online recently in the journal Nature, Ecology and Evolution says scientists have found extremely serious pollution in the deepest trenches currently known on Earth, where artificial toxic chemicals have reached the deepest ocean and endanger those lives In the darkness of the marine creatures.
A survey released by the research team at the University of Aberdeen, Newcastle and the James Hutton Institute of the United Kingdom revealed that samples were sampled from the crustacean carcasses collected from the Pacific Mariana Trench and the Kermadek Trench High concentrations of persistent organic pollutants (PCBs) and polybrominated diphenyl ethers (PBDE), etc., the two trenches of the sea from the sea more than 9656 meters, the first author of the study, the University of Aberdeen researchers Alan Jamison and his colleagues found that the 10-kilometer end of the crustacean craniocets lived below sea level, and the content of persistent organic pollutants in adipose tissue was extremely high and difficult to degrade, It is 50 times that of similar pollutants in normal river crabs, which is very close to the level of Junhe Bay in Shizuoka Prefecture, Japan, which is one of the most polluted industrial areas in the Northwest Pacific.
According to British media reports, polychlorinated biphenyls and polybrominated diphenyl ethers are extremely difficult to break down and easily accumulate in organisms. They have been widely used as electrical insulators and flame retardants, although they were banned in the 1980s. Polychlorinated biphenyls are leaking from landfills, demolished buildings, and old industrial areas into rivers and the sea. They are extremely damaging to animals, once exposed, the immune system will be weakened, reproductive success rate decreased. In the case of killer whales, these pests accumulate in the whale, which may cause abortion or newborn whales to die.
Scientists at the University of Newcastle in the UK argue that contaminants are able to enter the trench, possibly they are attached to plastic particles, or contain contaminants in the carcasses that sink into the seabed, and then lead the results through the food chain. "We thought that the deep sea was not affected by humans, but the study showed that this was not the case, and that once the pollutants entered the trench they could not be degraded or spread to other places, they would only accumulate more slowly in the seabed. It is a major challenge for us to be faced with the impact of this on the entire ecosystem, which is not far from us and even closely related to surface water, which means that one day, The things we threw into the sea will re-emerge in some form. "