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Abundant plankton-sized microplastic particles in shelf waters of the northern Gulf of Mexico.
Environ Pollut. 2017 Nov; 230:798-809.EP

Abstract

Accumulation of marine debris is a global problem that affects the oceans on multiple scales. The majority of floating marine debris is composed of microplastics: plastic particles up to 5 mm in diameter. With similar sizes and appearances to natural food items, these small fragments pose potential risks to many marine organisms including zooplankton and zooplanktivores. Semi-enclosed seas are reported to have high concentrations of microplastics, however, the distribution and concentration of microplastics in one such system, the Gulf of Mexico, remains unknown. Our study documented and characterized microplastics in continental shelf waters off the Louisiana coast in the northern Gulf of Mexico, using bongo nets, neuston nets, and Niskin bottles. Additionally, we compared the size distributions of microplastics and zooplankton collected using the nets. Plastics were manually sorted from the samples, documented, and measured using digital microscopy. Confirmation of putative plastics was carried out by hydrofluoric acid digestion and a subsample was analyzed using FTIR microscopy. Estimated concentrations of microplastics collected on the inner continental shelf during this study are among the highest reported globally. Total microplastic concentrations ranged from 4.8 to 8.2 particles m-3 and 5.0-18.4 particles m-3 for the bongo and neuston samples, respectively. Niskin bottles collected smaller plastic particles than the nets and indicated total microplastic concentrations (primarily fibers) from 6.0E4 - 15.7E4 particles m-3. Microplastic concentrations were greater than the abundances of all but four of the five most abundant taxa from bongo nets and were not statistically different from the abundances of any of the most numerous taxa from neuston nets. Sizes of microplastics and zooplankton partially or completely overlapped, suggesting the potential for confusion with natural prey.

Authors+Show Affiliations

Louisiana State University, College of the Coast and Environment, Department of Oceanography and Coastal Sciences, Baton Rouge, LA 70803, USA.Louisiana State University, College of the Coast and Environment, Department of Oceanography and Coastal Sciences, Baton Rouge, LA 70803, USA.Louisiana State University, College of the Coast and Environment, Department of Oceanography and Coastal Sciences, Baton Rouge, LA 70803, USA. Electronic address: mbenfie@lsu.edu.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28734261

Citation

Di Mauro, Rosana, et al. "Abundant Plankton-sized Microplastic Particles in Shelf Waters of the Northern Gulf of Mexico." Environmental Pollution (Barking, Essex : 1987), vol. 230, 2017, pp. 798-809.
Di Mauro R, Kupchik MJ, Benfield MC. Abundant plankton-sized microplastic particles in shelf waters of the northern Gulf of Mexico. Environ Pollut. 2017;230:798-809.
Di Mauro, R., Kupchik, M. J., & Benfield, M. C. (2017). Abundant plankton-sized microplastic particles in shelf waters of the northern Gulf of Mexico. Environmental Pollution (Barking, Essex : 1987), 230, 798-809. https://doi.org/10.1016/j.envpol.2017.07.030
Di Mauro R, Kupchik MJ, Benfield MC. Abundant Plankton-sized Microplastic Particles in Shelf Waters of the Northern Gulf of Mexico. Environ Pollut. 2017;230:798-809. PubMed PMID: 28734261.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Abundant plankton-sized microplastic particles in shelf waters of the northern Gulf of Mexico. AU - Di Mauro,Rosana, AU - Kupchik,Matthew J, AU - Benfield,Mark C, Y1 - 2017/08/10/ PY - 2016/09/16/received PY - 2017/07/10/revised PY - 2017/07/11/accepted PY - 2017/7/25/pubmed PY - 2017/12/29/medline PY - 2017/7/23/entrez KW - Acid digestion KW - Marine debris KW - Marine pollution KW - Microplastics KW - Surface area KW - Zooplankton SP - 798 EP - 809 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ. Pollut. VL - 230 N2 - Accumulation of marine debris is a global problem that affects the oceans on multiple scales. The majority of floating marine debris is composed of microplastics: plastic particles up to 5 mm in diameter. With similar sizes and appearances to natural food items, these small fragments pose potential risks to many marine organisms including zooplankton and zooplanktivores. Semi-enclosed seas are reported to have high concentrations of microplastics, however, the distribution and concentration of microplastics in one such system, the Gulf of Mexico, remains unknown. Our study documented and characterized microplastics in continental shelf waters off the Louisiana coast in the northern Gulf of Mexico, using bongo nets, neuston nets, and Niskin bottles. Additionally, we compared the size distributions of microplastics and zooplankton collected using the nets. Plastics were manually sorted from the samples, documented, and measured using digital microscopy. Confirmation of putative plastics was carried out by hydrofluoric acid digestion and a subsample was analyzed using FTIR microscopy. Estimated concentrations of microplastics collected on the inner continental shelf during this study are among the highest reported globally. Total microplastic concentrations ranged from 4.8 to 8.2 particles m-3 and 5.0-18.4 particles m-3 for the bongo and neuston samples, respectively. Niskin bottles collected smaller plastic particles than the nets and indicated total microplastic concentrations (primarily fibers) from 6.0E4 - 15.7E4 particles m-3. Microplastic concentrations were greater than the abundances of all but four of the five most abundant taxa from bongo nets and were not statistically different from the abundances of any of the most numerous taxa from neuston nets. Sizes of microplastics and zooplankton partially or completely overlapped, suggesting the potential for confusion with natural prey. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/28734261/Abundant_plankton_sized_microplastic_particles_in_shelf_waters_of_the_northern_Gulf_of_Mexico_ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(16)31342-2 DB - PRIME DP - Unbound Medicine ER -