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Long M., Moriceau B., Gallinari M., Lambert C., Huvet A., Raffray Jean, Soudant P. (2015). Interactions between microplastics and phytoplankton aggregates : impact on their respective fates. Marine Chemistry, 175 (SI), 39-46. ISSN 0304-4203

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Lien direct chez l'éditeur doi:10.1016/j.marchem.2015.04.003

Titre
Interactions between microplastics and phytoplankton aggregates : impact on their respective fates
Année de publication2015
Type de documentArticle référencé dans le Web of Science WOS:000358391100005
AuteursLong M., Moriceau B., Gallinari M., Lambert C., Huvet A., Raffray Jean, Soudant P.
SourceMarine Chemistry, 2015, 175 (SI), p. 39-46. ISSN 0304-4203
RésuméPlastic debris are resistant to degradation, and therefore tend to accumulate in marine environment. Nevertheless recent estimations of plastic concentrations at the surface of the ocean were lower than expected leading the communities to seek new sinks. Among the different processes suggested we chose to focus on the transport of microplastics from the surface to deeper layers of the ocean via phytoplankton aggregates that constitute most of the sinking flux. Interactions between microplastics and aggregates were studied by building a new device: the flow-through roller tank that mimics the behaviour of laboratory made aggregates sinking through a dense layer of microplastics. Three types of aggregates formed from two different algae species (the diatom Chaetoceros neogracile, the cryptophyte Rhodomonas salina and a mix) were used as model. With their frustule made of biogenic silica which is denser than the organic matter, diatom aggregates sunk faster than R. sauna aggregates. Diatom aggregates were on average bigger and stickier while aggregates from R. sauna were smaller and more fragile. With higher concentrations measured in R. saline aggregates, all model-aggregates incorporated and concentrated microplastics, substantially increasing the microplastic sinking rates from tenths to hundreds of metres per day. Our results clearly show that marine aggregates can be an efficient sink for microplastics by influencing their vertical distribution in the water column. Furthermore, despite the high plastic concentrations tested, our study opens new questions regarding the impact of plastics on sedimentation fluxes in oceans. As an effect of microplastic incorporation, the sinking rates of diatom aggregates strongly decreased meanwhile the sinking rates of cryptophyte aggregates increased.
Plan de classementEcologie, systèmes aquatiques [036] ; Sciences fondamentales / Techniques d'analyse et de recherche [020]
LocalisationFonds IRD [F B010064876]
Identifiant IRDfdi:010064876
Lien permanenthttp://www.documentation.ird.fr/hor/fdi:010064876

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