Persistence of plastic debris and its colonization by bacterial communities after two decades on the abyssal seafloor.

Krause, Stefan , Molari, M., Gorb, E. V., Gorb, Stanislav, Kossel, Elke and Haeckel, Matthias (2020) Persistence of plastic debris and its colonization by bacterial communities after two decades on the abyssal seafloor. Open Access Scientific Reports, 10 (9484). DOI 10.1038/s41598-020-66361-7.

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Abstract

The fate of plastic debris entering the oceans is largely unconstrained. Currently, intensified research is devoted to the abiotic and microbial degradation of plastic floating near the ocean surface for an extended period of time. In contrast, the impacts of environmental conditions in the deep sea on polymer properties and rigidity are virtually unknown. Here, we present unique results of plastic items identified to have been introduced into deep-sea sediments at a water depth of 4150 m in the eastern equatorial Pacific Ocean more than two decades ago. The results, including optical, spectroscopic, physical and microbial analyses, clearly demonstrate that the bulk polymer materials show no apparent sign of physical or chemical degradation. Solely the polymer surface layers showed reduced hydrophobicity, presumably caused by microbial colonization. The bacterial community present on the plastic items differed significantly (p < 0.1%) from those of the adjacent natural environment by a dominant presence of groups requiring steep redox gradients (Mesorhizobium, Sulfurimonas) and a remarkable decrease in diversity. The establishment of chemical gradients across the polymer surfaces presumably caused these conditions. Our findings suggest that plastic is stable over extended times under deep-sea conditions and that prolonged deposition of polymer items at the seafloor may induce local oxygen depletion at the sediment-water interface.

Document Type: Article
Research affiliation: OceanRep > GEOMAR > FB2 Marine Biogeochemistry > FB2-MG Marine Geosystems
Kiel University
Refereed: Yes
Open Access Journal?: Yes
DOI etc.: 10.1038/s41598-020-66361-7
ISSN: 2045-2322
Projects: JPIO-MiningImpact, BASEMAN
Expeditions/Models/Experiments:
Date Deposited: 15 Jun 2020 11:09
Last Modified: 29 Jul 2020 07:27
URI: http://oceanrep.geomar.de/id/eprint/49864

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