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Influence of environmental and anthropogenic factors on the composition, concentration and spatial distribution of microplastics: A case study of the Bay of Brest (Brittany, France).
Environ Pollut. 2017 Jun; 225:211-222.EP

Abstract

The concentration and spatial distribution of microplastics in the Bay of Brest (Brittany, France) was investigated in two surveys. Surface water and sediment were sampled at nine locations in areas characterized by contrasting anthropic pressures, riverine influences or water mixing. Microplastics were categorized by their polymer type and size class. Microplastic contamination in surface water and sediment was dominated by polyethylene fragments (PE, 53-67%) followed by polypropylene (PP, 16-30%) and polystyrene (PS, 16-17%) microparticles. The presence of buoyant microplastics (PE, PP and PS) in sediment suggests the existence of physical and/or biological processes leading to vertical transfer of lightweight microplastics in the bay. In sediment (upper 5 cm), the percentage of particles identified by Raman micro-spectroscopy was lower (41%) than in surface water (79%) and may explain the apparent low concentration observed in this matrix (0.97 ± 2.08 MP kg-1 dry sediment). Mean microplastic concentration was 0.24 ± 0.35 MP m-3 in surface water. We suggest that the observed spatial MP distribution is related to proximity to urbanized areas and to hydrodynamics in the bay. A particle dispersal model was used to study the influence of hydrodynamics on surface microplastic distribution. The outputs of the model showed the presence of a transitional convergence zone in the centre of the bay during flood tide, where floating debris coming from the northern and southern parts of the bay tends to accumulate before being expelled from the bay. Further modelling work and observations integrating (i) the complex vertical motion of microplastics, and (ii) their point sources is required to better understand the fate of microplastics in such a complex coastal ecosystem.

Authors+Show Affiliations

LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, IUEM, rue Dumont d'Urville, 29280 Plouzané, France.LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, IUEM, rue Dumont d'Urville, 29280 Plouzané, France. Electronic address: ika.paulpont@univ-brest.fr.Ifremer, Laboratoire Détection, Capteurs et Mesures, Centre de Bretagne, ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France.Ifremer, LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, Centre de Bretagne, ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France.LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, IUEM, rue Dumont d'Urville, 29280 Plouzané, France.LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, IUEM, rue Dumont d'Urville, 29280 Plouzané, France.LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, IUEM, rue Dumont d'Urville, 29280 Plouzané, France.LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, IUEM, rue Dumont d'Urville, 29280 Plouzané, France.Ifremer, LEMAR UMR 6539 CNRS/UBO/IRD/Ifremer, Centre de Bretagne, ZI de la Pointe du Diable, CS 10070, 29280 Plouzané, France.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

28371735

Citation

Frère, L, et al. "Influence of Environmental and Anthropogenic Factors On the Composition, Concentration and Spatial Distribution of Microplastics: a Case Study of the Bay of Brest (Brittany, France)." Environmental Pollution (Barking, Essex : 1987), vol. 225, 2017, pp. 211-222.
Frère L, Paul-Pont I, Rinnert E, et al. Influence of environmental and anthropogenic factors on the composition, concentration and spatial distribution of microplastics: A case study of the Bay of Brest (Brittany, France). Environ Pollut. 2017;225:211-222.
Frère, L., Paul-Pont, I., Rinnert, E., Petton, S., Jaffré, J., Bihannic, I., Soudant, P., Lambert, C., & Huvet, A. (2017). Influence of environmental and anthropogenic factors on the composition, concentration and spatial distribution of microplastics: A case study of the Bay of Brest (Brittany, France). Environmental Pollution (Barking, Essex : 1987), 225, 211-222. https://doi.org/10.1016/j.envpol.2017.03.023
Frère L, et al. Influence of Environmental and Anthropogenic Factors On the Composition, Concentration and Spatial Distribution of Microplastics: a Case Study of the Bay of Brest (Brittany, France). Environ Pollut. 2017;225:211-222. PubMed PMID: 28371735.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of environmental and anthropogenic factors on the composition, concentration and spatial distribution of microplastics: A case study of the Bay of Brest (Brittany, France). AU - Frère,L, AU - Paul-Pont,I, AU - Rinnert,E, AU - Petton,S, AU - Jaffré,J, AU - Bihannic,I, AU - Soudant,P, AU - Lambert,C, AU - Huvet,A, Y1 - 2017/04/01/ PY - 2016/07/18/received PY - 2017/03/08/revised PY - 2017/03/09/accepted PY - 2017/4/4/pubmed PY - 2017/7/29/medline PY - 2017/4/4/entrez KW - Coastal ecosystem KW - Dispersal particle modelling KW - Hydrodynamic KW - Microplastic KW - Raman spectroscopy KW - Sediment KW - Surface water SP - 211 EP - 222 JF - Environmental pollution (Barking, Essex : 1987) JO - Environ. Pollut. VL - 225 N2 - The concentration and spatial distribution of microplastics in the Bay of Brest (Brittany, France) was investigated in two surveys. Surface water and sediment were sampled at nine locations in areas characterized by contrasting anthropic pressures, riverine influences or water mixing. Microplastics were categorized by their polymer type and size class. Microplastic contamination in surface water and sediment was dominated by polyethylene fragments (PE, 53-67%) followed by polypropylene (PP, 16-30%) and polystyrene (PS, 16-17%) microparticles. The presence of buoyant microplastics (PE, PP and PS) in sediment suggests the existence of physical and/or biological processes leading to vertical transfer of lightweight microplastics in the bay. In sediment (upper 5 cm), the percentage of particles identified by Raman micro-spectroscopy was lower (41%) than in surface water (79%) and may explain the apparent low concentration observed in this matrix (0.97 ± 2.08 MP kg-1 dry sediment). Mean microplastic concentration was 0.24 ± 0.35 MP m-3 in surface water. We suggest that the observed spatial MP distribution is related to proximity to urbanized areas and to hydrodynamics in the bay. A particle dispersal model was used to study the influence of hydrodynamics on surface microplastic distribution. The outputs of the model showed the presence of a transitional convergence zone in the centre of the bay during flood tide, where floating debris coming from the northern and southern parts of the bay tends to accumulate before being expelled from the bay. Further modelling work and observations integrating (i) the complex vertical motion of microplastics, and (ii) their point sources is required to better understand the fate of microplastics in such a complex coastal ecosystem. SN - 1873-6424 UR - https://www.unboundmedicine.com/medline/citation/28371735/Influence_of_environmental_and_anthropogenic_factors_on_the_composition_concentration_and_spatial_distribution_of_microplastics:_A_case_study_of_the_Bay_of_Brest__Brittany_France__ L2 - https://linkinghub.elsevier.com/retrieve/pii/S0269-7491(17)30983-1 DB - PRIME DP - Unbound Medicine ER -