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Scientists Warn of Threat of Plastic Waste on Marine Life

A huge belt of plastic photographed floating off the coast of the Caribbean island of Roatan, Honduras. (AFP)
A huge belt of plastic photographed floating off the coast of the Caribbean island of Roatan, Honduras. (AFP)
    Sydney, London - Asharq Al-Awsat
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Scientists Warn of Threat of Plastic Waste on Marine Life

A huge belt of plastic photographed floating off the coast of the Caribbean island of Roatan, Honduras. (AFP)
A huge belt of plastic photographed floating off the coast of the Caribbean island of Roatan, Honduras. (AFP)

Scientists are warning that micro-plastics in the ocean and the toxic chemicals in them are posing a significant risk to giant animals like whales, sharks and manta rays that are marine filter feeders.

A new study published in the Trends in Ecology and Evolution journal said that such animals swallow thousands of cubic meters of seawater daily in an effort to capture plankton, in which case they can ingest micro-plastics directly from polluted water or indirectly through contaminated prey, the German News Agency (dpa) reported.

Micro-plastics are small plastic pieces less than five millimeters long, which are harmful to marine life.

The study added that plastic-associated chemicals and pollutants can accumulate over decades and alter biological processes in the animals, leading to altered growth, development and reproduction, including reduced fertility.

Elitza Germanov, lead researcher of the study, said: “While a definitive connection between micro-plastic ingestion and toxin exposure for filter feeders remains to be confirmed, studies into seabirds and small fish have found a link.”

The marine species are also in danger due to their habitat areas overlapping micro-plastic pollution hotspots like the Gulf of Mexico, the Mediterranean Sea, the Bay of Bengal and the Coral Triangle (an area from Malaysia to the Solomon Islands in the Pacific).

Many of the animals, like manta rays, are threatened species, so it is difficult to assess plastic concentrations via conventional methods, such as stomach analysis, Germanov said.

The study’s lead author explained: “So we are using the non-lethal sampling of small amounts of tissue, which we are testing for chemical tracers using sophisticated and sensitive analytical tools.”

Many of the filter-feeding animals live a long life, but have few offspring throughout their lives.

Maria Cristina Fossi, a co-author of the study, said another study she led on whale sharks in the Gulf of California and on fin whales in the Mediterranean Sea confirmed exposure to toxic chemicals.

“As these areas are hotspots for micro-plastics, our results could indicate that filter feeders are taking up micro-plastics in their feeding grounds,” she said.

Lately, there has been a large number of reports and studies on marine life facing an existential threat from the millions of tons of plastic waste that end up in the oceans each year.

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Soviet-era Spacecraft Plunges to Earth after 53 Years Stuck in Orbit

FILE - This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)
FILE - This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)
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Soviet-era Spacecraft Plunges to Earth after 53 Years Stuck in Orbit

FILE - This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)
FILE - This photo provided by researcher Jane Greaves shows the planet Venus, seen from the Japan Aerospace Exploration Agency's Akatsuki probe in May 2016. (J. Greaves/Cardiff University/JAXA via AP)

A Soviet-era spacecraft plunged to Earth on Saturday, more than a half-century after its failed launch to Venus.
The European Union Space Surveillance and Tracking confirmed its uncontrolled reentry, based on analysis and no-shows of the spacecraft on subsequent orbits. The European Space Agency’s space debris office also indicated that the spacecraft had reentered after it failed to appear over a German radar station.
It was not immediately known where the spacecraft came in or how much, if any, of the half-ton spacecraft survived the fiery descent from orbit. Experts said ahead of time that some if not all of it might come crashing down, given it was built to withstand a landing on Venus, the solar system’s hottest planet.
The chances of anyone getting clobbered by spacecraft debris were exceedingly low, scientists said.
Launched in 1972 by the Soviet Union, the spacecraft known as Kosmos 482 was part of a series of missions bound for Venus. But this one never made it out of orbit around Earth, stranded there by a rocket malfunction.
Much of the spacecraft came tumbling back to Earth within a decade of the failed launch. No longer able to resist gravity’s tug as its orbit dwindled, the spherical lander — an estimated 3 feet (1 meter) across — was the last part of the spacecraft to come down. The lander was encased in titanium, according to experts, and weighed more than 1,000 pounds (495 kilograms).
After following the spacecraft’s downward spiral, scientists, military experts and others could not pinpoint in advance precisely when or where the spacecraft might come down. Solar activity added to the uncertainty as well as the spacecraft’s deteriorating condition after so long in space.
As of Saturday morning, the US Space Command had yet to confirm the spacecraft's demise as it collected and analyzed data from orbit.
The US Space Command routinely monitors dozens of reentries each month. What set Kosmos 482 apart — and earned it extra attention from government and private space trackers — was that it was more likely to survive reentry, according to officials.
It was also coming in uncontrolled, without any intervention by flight controllers who normally target the Pacific and other vast expanses of water for old satellites and other space debris.