Deep-Sea News

Plastic in the Deep Sea: Virtually Unaltered After a Quarter of a Century

First long-term study on plastic degradation in a water depth of more than 4000 meter

Even in the most remote regions of the ocean, plastic debris can be found. But usually it is impossible to determine how long they have been lying on the seabed. Up to now, this has also hampered any attempt to estimate how long plastic degradation might take. Scientists led by the GEOMAR Helmholtz Centre for Ocean Research Kiel have now, for the first time, examined plastic items that have verifiably been at the abyssal seabed for more than 20 years. As the researchers publish in the online journal Scientific Reports, they could not find any traces of fragmentation or even degradation.

                               Plastic bag at the seafloor of the DISCOL area as seen by the deep-sea robot ROV KIEL 6000. Photo: ROV-Team/GEOMAR

Plastic products are durable. On one hand this is a great advantage, but on the other hand, if the plastic enters the environment, this advantage turns into a problem. According to current knowledge, natural degradation, as with organic matter, does not take place. It can only be estimated, how long plastic debris actually remains in the environment. Corresponding long-term experiments are lacking.

EM2 CokeCan label1On board the research vessel SONNE the scientists found a cola can inside the plastic bag. The labeling was still clearly visible. Photo: Matthias Haeckel/GEOMAR

This applies particularly to the deep sea that is poorly explored itself. Plastic objects that are found by chance with the help of deep-sea robots or other underwater vehicles are difficult to date. However, during an expedition with the German research vessel SONNE in 2015, researchers from the GEOMAR Helmholtz Centre for Ocean Research Kiel, the Max Planck Institute for Marine Microbiology in Bremen and the Kiel University were able to recover several pieces of waste from the seabed of the Eastern Pacific Ocean in a depth of more than 4000 meters. Conducting a little detective work allowed to constrain the age of deposition accurately. For the first time, this offered the opportunity to conduct a long-term study on plastic degradation in the deep sea.

EM3 Quark box 3The labelling of the curd box looked almost like new. Photo: Matthias Haeckel/GEOMAR

In reality, in 2015 the team was out in the Pacific about 440 nautical miles (815 km) off the coast of Peru to investigate another long-term experiment in the so-called DISCOL area. There, German scientists had ploughed a piece of seafloor in 1989 in order to understand the environmental impacts arising from potential future mining of manganese nodules. They visited this site again in 1992, 1996 and in 2015 to study the recovery of the deep-sea ecosystem.

EM4 2015 09 13 SO242 1 015 PLinke GEOMAR originalThe Remotely Operated Deep-Sea Vehicle ROV KIEL 6000 shortly before a dive during Expedition SO242. Photo: Peter Linke/GEOMAR

In 2015, the remotely operated deep-sea robot ROV KIEL 6000 observed almost incidentally some waste and recovered it from the seafloor. Among it was a plastic bag containing a Coke can, which was part of a special edition produced for the Davis Cup 1988. "The aluminum can itself would have corroded in the deep sea, if it was not wrapped tightly inside a plastic garbage bag that preserved it. This also indicates that the garbage bag must be of the same age," says Dr. Matthias Haeckel from GEOMAR, project manager on board back then and now co-author of the study.

RV SONNE oon cruise SO242/2 in the DISCOL area off Peru.The research vessel SONNE in the South East Pacific during expedition SO242. Actually, the aim of this expedition was to investigate the ecological impact of potential manganese nodule mining in the deep sea. Photo: Ralph Schwarz/GEOMAR

A second recovered item was a curd box from a German manufacturer. The printed address shows a five-digit postal code. These were not introduced in Germany until 1990. However, the manufacturer was bought by a rival company in 1999, and the brand name disappeared.

"Since the DISCOL area is far away from important shipping routes, the plastic bag and the curd box could be attributed to the DISCOL expeditions in 1989 and 1992 or 1996," says Dr Haeckel. After all, this offered the extremely rare opportunity to examine in detail datable plastic objects from the deep sea. "It turned out that neither the bag nor the curd box showed signs of fragmentation or even degradation," says biochemist Dr. Stefan Krause from GEOMAR, lead author of the study. He led the onshore analyses in the home laboratories.

A scientifically most interesting finding was that the microbial community on the plastic surfaces differed from the one identified in the surrounding seafloor sediments. "All of the species can be found in the deep-sea sediment, but apparently, larger accumulations of plastics could locally cause a shift in the ratio of the predominant species," says Dr. Krause.

Overall, the study provides the first scientifically sound indication of the fate of plastic debris in the deep sea. "This study builds also an important basis for our new project HOTMIC, where we aim to trace the plastic waste entering the ocean from the continents to the large oceanic eddies and further to their final sink, the abyssal seafloor," says Dr Haeckel.

At the same time, the findings provide a good argument for him to pay even closer attention to compliance with regulations regarding waste on board. "Fortunately, the mentality has changed considerably since the 1990s. Today, both, the crews of the ships and the research teams on board take great care to ensure that no waste is disposed overboard," says Dr Haeckel.

By GEOMAR Helmholtz Centre for Ocean Research Kiel

Journal Reference:

S. Krause, M. Molari, E. V. Gorb, S. N. Gorb, E. Kossel, M. Haeckel. Persistence of plastic debris and its colonization by bacterial communities after two decades on the abyssal seafloor. Scientific Reports, 2020; 10 (1) DOI: 10.1038/s41598-020-66361-7

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