Adhesion to coral surface as a potential sink for marine microplastics

C. Martin, E. Corona, G.A. Mahadik, C.M. Duarte
Environmental Pollution, volume 255, Part 2, (2019)

Adhesion to coral surface as a potential sink for marine microplastics

Keywords

Plastic, Coral reef, Scleractinia, Ingestion, Red Sea

Abstract

​Only 1% of plastic entering the ocean is found floating on its surface, with high loads in ocean accumulation zones and semi-enclosed seas, except for the Red Sea, which supports one of the lowest floating plastic loads worldwide. Given the extension of reefs in the Red Sea, we hypothesize a major role of scleractinian corals as sinks, through suspension-feeding, and assessed microplastic removal rates by three Red Sea coral species. Experimental evidence showed removal rates ranging from 0.25 × 10−3 to 14.8 × 10−3microplastic particles polyp−1 hour−1, among species. However, this was only 2.2 ± 0.6% of the total removal rate, with passive removal through adhesion to the coral surface being 40 times higher than active removal through suspension-feeding. These results point at adhesion of plastic to coral reef structures as a major sink for microplastics suspended in the water column after sinking, helping explain low concentrations in Red Sea surface waters.

Code

DOI: 10.1016/j.envpol.2019.113281

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