Passive and Active Removal of Marine Microplastics by a Mushroom Coral (Danafungia scruposa)

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35 Scopus citations

Abstract

Although millions of tons of plastics end up in oceans each year, floating plastics account for only about 1% of all plastic inputs in the ocean. Particularly, microplastics below 1 mm in length, are missing in surface waters due to removal processes like ingestion by marine animals, biofouling, and sinking. Here, we studied how a species of mushroom corals (Danafungia scruposa), common in the Maldives, contributed to the removal of microplastics from the water suspension through active (ingestion) and passive (adhesion to the surface) mechanisms. We evaluated if removal rates were affected by the presence of the coral natural prey (i.e., Artemia salina) and by biofouling on the surface of the microplastic. We found that the coral quickly interacts both actively and passively with microplastics and that the probability for the coral to ingest and retain microplastics was higher when the surface of the microplastic was biofouled. We also found that passive adhesion of microplastics was the primary mechanism through which corals sequester microplastics from the water column.
Original languageEnglish (US)
JournalFrontiers in Marine Science
Volume7
DOIs
StatePublished - Mar 5 2020

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: We thank the MaRHE Center of the University of Milano-Bicocca, especially Davide Maggioni for support during field-work. We also thank Julia Reisser, with the Ocean Clean-up Project for providing the biofouled microplastic from the N. Pacific Gyre used in the experiment. Funding. This work was supported and funded by the King Abdullah University of Science and Technology (KAUST) through the baseline funding of CD.

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