Scientists Found Anthropogenic Mercury in Earth's Deep Ocean Trenches

Scientists found anthropogenic mercury in Earth's deep ocean trenches
Scientists found anthropogenic mercury in Earth's deep ocean trenches


Scientists found anthropogenic mercury in Earth's deep ocean trenches. Two teams of marine biologists have found methylmercury, a potent toxin that biodegrades in sediments and endangered organisms of sea-borne species in the trenches of Mariana, Yap, and Kermadec in the Pacific Ocean.

The Mariana Trench has a snail (bottom left) and a small amphibian (center) at 8,145 meters, the deepest stretch in the world in the western Pacific Ocean. Tianjin University Dr. One of the research teams led by Ruoyu Sun, measured mercury concentrations and isotopic compositions in 7,000–11,000 m of captured snails and crustaceans and stored at 5,500–9,200 m in the Mariana and Yap.

"During 2016-2017, we deployed sophisticated offshore movement vehicles on the seabed of the Mariana and Yap trenches, which are among the most remote and inaccessible places on Earth, and captured endemic fauna and sediment collections. Done, "Dr. Sun said, "We were able to present evidence of uneven isotopes of mercury that mercury in trench fauna originates from methylmercury, especially in the upper ocean."

"We can attribute this to the specific isotopic fingerprint that indicates that it comes from the upper ocean." Previous research had concluded that methylmercrew occurred primarily in the first few hundred meters of the ocean. To be sure, there will be limited mercury bioaccumulation that is deeper than fish that would have had a limited opportunity to ingest methylmercury. With this work, we now believe that this is not true.

Dr. from the University of Michigan The second team, led by Joel Blum, took samples of fish and shellfish from the Mariana and Cremadec trenches. "We have used isotopic signatures of mercury at both locations, suggesting that the mercury found in trench species is largely derived from the atmosphere and enters the ocean in the rain," the scientists said. .

"We know that this mercury accumulates from the atmosphere to the ocean surface and is then transported to the deep seas in fish and marine mammals, as well as to bodies drowned in small particles," said Dr. Blum. We identified this by measuring the isotopic composition of mercury, which showed that mercury at sea level coincided with that of fish found at approximately 400-600 m depth in the Central Pacific.

"Some of this mercury occurs naturally, but most of it is likely to come from human activity." Dr. Our findings suggest that deep oceans occur in the deep seas, and this means that anthropogenic mercury on Earth's surface is more widespread in the deep seas than before. Scientists will present their results for this week at the GoldsmithID 2020 Geochemistry Conference.



Pink flamingos with lasers are more aggressive
Pink flamingos with lasers are more aggressive


Pink flamingos with lasers are more aggressive, according to new studies. Lesser flamingos (Phoeniconaias minor), a species of flamingo found in sub-Saharan Africa and India, do not have a reproductive period. When in good condition, they reproduce; And this is often demonstrated by a 'pink blush' on the wings. So when birds are more irritable than food, according to new research, most pink people put pressure on others.

A bright pink flamingo low pushing a paler bird. Flamingos live in large groups with complex social structures. Color plays an important role in this, ”said Dr. Paul Rose, a researcher at the University of Exeter. "The color comes from the carotenoids in their food, which are mainly algae for lesser flamingos that filter with water."

"A healthy flamingo that is an efficient feeder, demonstrated by its colorful feathers, will have more time and energy to be aggressive and prominent when feeding." Dr. Rose and his colleague Laura Soule of the Sparshole University Center studied the behavior of the lesser flamingo housed at the Slimbridge Wetland Center of the Wildfowl and Wetlands Trust (WWT).

Scientists observed birds under various feeding conditions: in an indoor feeding container, a large indoor feeding pool, and a large pool with available food. In outdoor pools, flamingos spent less than half the time exhibiting aggressiveness, while feeding times doubled (compared to feeding with a bowl).

"When birds have to group together to get their food, they tend to fluff up more and therefore spend less time," said Dr. Rose. "It is not always possible to feed these birds from the outside, as the flamingo Bass weighs just 2kg and is native to Africa, so captive birds in places like the UK will be very cold when they come out in winter. "

However, this study suggests that they should be fed in as wide an area as possible. Whenever possible, creating a large outdoor feeding area can encourage natural eating patterns and reduce excess aggression. This research suggests that zoos don't have to drastically change the way they place their animals for a big beneficial difference in animal behavior.

The findings were published in the journal Ethology.



     

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