“… 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.
Plastic waste causes $13 billion in damage to marine ecosystems each year, according to the UN Environment Program. California and cities including Chicago, Seattle and Portland have banned single-use plastic bags.
“The implications are obvious and severe,” said Jim Elliott, director of the Center for Birds of Prey, about the discovery of the repellents and retardants in all 27 birds sampled among eagles, hawks and owls. “Who’s next on the (food chain) ladder? It’s us.”
A UC Davis researcher is studying whether tiny bits of plastic used in face washes, toothpaste and other consumer products are accumulating in Sacramento-area rivers and flowing out to the Pacific Ocean. Microbeads are tiny synthetic particles barely noticeable to… Read More ›