当前位置： SCI文献检索 > CHEMOSPHERE期刊下所有文献 > Greenhouse gas cycling by the plastisphere: The sleeper issue of plastic pollution.

Greenhouse gas cycling by the plastisphere: The sleeper issue of plastic pollution.

Abstract：

:Plastic is an allochthonous material to marine ecosystems but is rapidly colonized by marine microbial communities, with an as yet unclear contribution to biogeochemical cycles. In this study, we investigated the influence of an active microbial community grown on microplastic particles (the plastisphere) on CO2 and N2O recycling and its potential role in greenhouse gas inventories and air-sea exchange. Microplastics were collected during two cruises (Cimar 21 and FIP Montes Submarinos) from the surface layer (5 m depth) from several contrasting trophic regions of the South Pacific Ocean, i.e., from a transition zone off the eutrophic coastal upwelling of Chile, to a mesotrophic transition area of oceanic seamounts and, finally, to an oligotrophic zone in the South Pacific Subtropical Gyre. . Experiments were carried out onboard to evaluate CO2 and N2O production/consumption by the plastisphere. The active microbial community and its specific quantification were determined for Cimar 21 using iTag 16 S rRNA. The experiments showed that the plastisphere generally contributed to CO2 and N2O production/consumption, with rates ranging from -20.5 (consumption) to +4.5 (production) μmol/m2/d. The seamounts and the transition zone presented the highest production/consumption rates. The experiments performed in the two seamount stations showed that production and consumption of CO2 were related to the environmental nutrient concentration. Both stations presented N2O consumption that was associated with the high nitrogen deficit of the subantarctic water mass. The transition zone presented CO2 and N2O production in a plastisphere dominated by heterotrophic communities. The plastisphere in oligotrophic waters was diverse and active. The experiments, however, presented low or no production of greenhouse gases. Our results show a contribution of CO2 and N2O to the global gas surface inventories and air-sea exchange is lower than 1% of the global sources. These results highlight different critical impacts of plastic pollution on the environment that have, until now, not been considered.

journal_name

Chemosphere

journal_title

Chemosphere

authors

Cornejo-D'Ottone M,Molina V,Pavez J,Silva N

doi

10.1016/j.chemosphere.2019.125709

subject

Has Abstract

pub_date

2020-05-01 00:00:00

pages

125709

eissn

0045-6535

issn

1879-1298

pii

S0045-6535(19)32950-9

journal_volume

246

pub_type

杂志文章

在线工具

Greenhouse gas cycling by the plastisphere: The sleeper issue of plastic pollution.