“Isolating plastic fibres from inside animals from nearly 11 kilometres deep (seven miles) just shows the extent of the problem. Also, the number of areas we found this in, and the thousands of kilometre distances involved shows it is not just an isolated case, this is global.”
Microplastics in Ocean
More than five trillion pieces of plastic are estimated floating on the surface of the world’s oceans. It has been claimed that there is now enough plastic to form a permanent layer in the fossil record.
cientists say that the equivalent of a dump truck load of plastic is deposited in the world’s oceans every minute, and this quantity will only increase as consumption and population grow, too. By 2050, it’s said there will be more plastic than fish in the seas. The UN writes, “As many as 51 trillion microplastic particles – 500 times more than stars in our galaxy – litter our seas, seriously threatening marine wildlife.”
“… plastic debris is often contaminated with toxic chemicals. Plastics can absorb and concentrate toxic pollutants present at trace levels in seawater, and some of the chemical additives mixed in during the manufacturing process can be toxic as well. When marine organisms ingest chemical-laden plastic pieces, some of the pollutants may be released within the gut of the animal and absorbed into body tissue. Although it is uncertain how much of these harmful chemicals enter marine animals due to ingestion of plastic debris in the ocean, laboratory experiments suggest there may be reason for concern.”
The researchers then observed the oysters’ physiological responses to ingesting the microplastics. The most obvious effect was on reproduction. Oysters that were exposed to microplastics produced fewer and smaller egg cells and slower sperm. Exposed oysters also produced fewer larvae and their offspring tended to grow more slowly.
But ocean plastics pose a threat to a wide variety of marine animals, and their risk is determined by the amount of debris an animal encounters, as well as the size and shape of the debris.
A new global review led by the University of Exeter that set out to investigate the hazards of marine plastic pollution has warned that all seven species of marine turtles can ingest or become entangled in the discarded debris that… Read More ›