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Article Dans Une Revue Marine Pollution Bulletin Année : 2023

Microplastics in the maximum chlorophyll layer along a north-south transect in the Mediterranean Sea in comparison with zooplankton concentrations

Olivia Gérigny
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  • PersonId : 1303019
Dorian Bienvenu
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  • PersonId : 1303020
Christophe Ravel
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  • PersonId : 1303021
Pamela Fierro-González
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  • PersonId : 1302246
Loïc Guilloux
Nouha Makhlouf
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  • PersonId : 1303044
Javier Tesán Onrubia
Marc Pagano
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  • PersonId : 173214
  • IdHAL : marc-pagano

Résumé

The aim of this study was to characterize and quantify microplastics (MPs) at the chlorophyll maximum layer (CML), around 30 to 60 m depth, during a cruise dedicated to the study of contaminants in plankton, the MERITE-HIPPOCAMPE project, along a north-south transect in the western Mediterranean Sea (Tedetti et al., 2023). Plankton were collected by horizontal net tows in this layer using a multinet Hydrobios Midi equipped with 60 μm mesh-size nets. The collected plankton were fractionated through a sieve column for various later contaminant measurements and for zooplankton analysis (Fierro-Gonz´alez et al., 2023). For all stations, samples were also fully examined for microplastics (MPs) for fractions >300 μm. MPs were found at all stations in the CML layer (mean: 42.9 ± 45.4 MPs m- 3), of which 96 ± 4 % were fibers. The ratios of mesozooplankton/MPs and detritus/MPs in this CML were respectively 223 ± 315 and 2544 ± 2268. These data are analyzed together with MPs concentrations from sea- surface sampled with a 300 μm net-size Manta net at the same stations. Overall, our observations highlight the very high density of fibers at the CML, mainly associated with aggregates, raising the hypothesis of their interactions with marine snow. Therefore, the importance of marine snow and vertical layering will have to be considered in future MP distribution modelling efforts.
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Dates et versions

hal-04269744 , version 1 (03-11-2023)

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Citer

François Carlotti, Olivia Gérigny, Dorian Bienvenu, Christophe Ravel, Pamela Fierro-González, et al.. Microplastics in the maximum chlorophyll layer along a north-south transect in the Mediterranean Sea in comparison with zooplankton concentrations. Marine Pollution Bulletin, 2023, 196, pp.115614. ⟨10.1016/j.marpolbul.2023.115614⟩. ⟨hal-04269744⟩
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