Exponential increase of plastic burial in mangrove sediments as a major plastic sink
Martin, Cecilia (King Abdullah University of Science and Technology. Red Sea Research Center and Computational Bioscience Research Center)
Baalkhuyur, F. (King Abdullah University of Science and Technology. Red Sea Research Center and Computational Bioscience Research Center)
Valluzzi, L. (King Abdullah University of Science and Technology. Red Sea Research Center and Computational Bioscience Research Center)
Saderne, Vincent (King Abdullah University of Science and Technology. Red Sea Research Center and Computational Bioscience Research Center)
Cusack, M. (King Abdullah University of Science and Technology. Red Sea Research Center and Computational Bioscience Research Center)
Almahasheer, Hanan (Imam Abdulrahman Bin Faisal University. Department of Biology)
Krishnakumar, P. K. (King Fahd University of Petroleum and Minerals. Center for Environment and Water)
Rabaoui, L. (King Fahd University of Petroleum and Minerals. Center for Environment and Water)
Qurban, M. A. (King Fahd University of Petroleum and Minerals. Geosciences Department)
Arias Ortiz, Ariane (University of California. Department of Environmental Science)
Masqué Barri, Pere (Universitat Autònoma de Barcelona. Institut de Ciència i Tecnologia Ambientals)
Duarte, Carlos M.. (Aarhus University. Department of Biology)
Universitat Autònoma de Barcelona. Departament de Física

Data:	2020
Resum:	Sequestration of plastics in sediments is considered the ultimate sink of marine plastic pollution that would justify unexpectedly low loads found in surface waters. Here, we demonstrate that mangroves, generally supporting high sediment accretion rates, efficiently sequester plastics in their sediments. To this end, we extracted microplastics from dated sediment cores of the Red Sea and Arabian Gulf mangrove (Avicennia marina) forests along the Saudi Arabian coast. We found that microplastics <0. 5 mm dominated in mangrove sediments, helping explain their scarcity, in surface waters. We estimate that 50 ± 30 and 110 ± 80 metric tons of plastic may have been buried since the 1930s in mangrove sediments across the Red Sea and the Arabian Gulf, respectively. We observed an exponential increase in the plastic burial rate (8. 5 ± 1. 2% year-1) since the 1950s in line with the global plastic production increase, confirming mangrove sediments as long-term sinks for plastics.
Ajuts:	Agència de Gestió d'Ajuts Universitaris i de Recerca 2017/SGR-1588 Ministerio de Economía y Competitividad MDM2015-0552
Nota:	Unidad de excelencia María de Maeztu CEX2019-000940-M
Drets:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, sempre que no sigui amb finalitats comercials, i sempre que es reconegui l'autoria de l'obra original.
Llengua:	Anglès
Document:	Article ; recerca ; Versió publicada
Publicat a:	Science advances, Vol. 6, Issue 44 (October 2020) , art. eaaz5593, ISSN 2375-2548

DOI: 10.1126/sciadv.aaz5593
PMID: 33115749

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