Bioavailability of chromium, nickel, iron and manganese in relation to their speciation in coastal sediments downstream of ultramafic catchments: A case study in New Caledonia

Merrot, Pauline; Juillot, Farid; Flipo, Léonore; Tharaud, Mickaël; Viollier, Éric; Noël, Vincent; Pape, Pierre Le; Fernandez, Jean-Michel; Moreton, Benjamin; Morin, Guillaume

doi:10.1016/j.chemosphere.2022.134643

Cited by 10 publications

(6 citation statements)

References 116 publications

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“…This territory resulted from a non-volcanic geological formation caused by tectonic plate convergence during the Eocene, which resulted in one of the largest ophiolitic complexes on earth [ 50 ]. The progressive erosion of the ultramafic rock of the territory induced the transfer of metallic compounds to the lagoon, causing high concentrations and potential bioavailability of metals in the sea [ 41 , 51 , 52 ]. Rivers are vectors of matter toward the lagoon and have a low annual average flow rate but can increase massively after intense rainfall [ 53 ].…”

Section: Methodsmentioning

confidence: 99%

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

Meyneng,

Lemonnier,

Le Gendre

et al. 2024

Environmental Microbiome

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Background Coastal ecosystem variability at tropical latitudes is dependent on climatic conditions. During the wet, rainy season, extreme climatic events such as cyclones, precipitation, and winds can be intense over a short period and may have a significant impact on the entire land‒sea continuum. This study focused on the effect of river runoff across the southwest coral lagoon ecosystem of Grand Terre Island of New Caledonia (South Pacific) after a cyclonic event, which is considered a pulse disturbance at our study site. The variability of coastal microbiomes, studied by the metabarcoding of V4 18S (protists) and V4–V5 16S (bacteria) rDNA genes, after the cyclone passage was associated with key environmental parameters describing the runoff impact (salinity, organic matter proxies, terrestrial rock origin metals) and compared to community structures observed during the dry season. Results Microbiome biodiversity patterns of the dry season were destructured because of the runoff impact, and land-origin taxa were observed in the coastal areas. After the rainy event, different daily community dynamics were observed locally, with specific microbial taxa explaining these variabilities. Plume dispersal modeling revealed the extent of low salinity areas up to the coral reef area (16 km offshore), but a rapid (< 6 days) recovery to typical steady conditions of the lagoon's hydrology was observed. Conversely, during the same time, some biological components (microbial communities, Chl a) and biogeochemical components (particulate nickel, terrigenous organic matter) of the ecosystem did not recover to values observed during the dry season conditions. Conclusion The ecosystem resilience of subtropical ecosystems must be evaluated from a multidisciplinary, holistic perspective and over the long term. This allows evaluating the risk associated with a potential continued and long-term disequilibrium of the ecosystem, triggered by the change in the frequency and intensity of extreme climatic events in the era of planetary climatic changes.

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Section: Methodsmentioning

confidence: 99%

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

Meyneng,

Lemonnier,

Le Gendre

et al. 2024

Environmental Microbiome

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“…A two pools analysis, with a rapidly extractable pool or "labile pool", and a less rapidly extractable pool or "less labile pool", has been considered previously to represent the potential mobile trace metals under EDTA-based kinetic extractions; this approach has been applied to assess the total mobile pools of trace metals from sediments, soils, soils mixed with organic wastes, organic amendments and compost, (Bermond et al, 2005;Brunori et al, 2005;Fangueiro et al, 2005;Labanowski et al, 2008;Santos et al, 2010;Pasquet et al, 2018;Merrot et al, 2022;Klein et al, 2023). Under the same approach, trace metals and inorganic nutrients release rate from sunscreens to seawater has been determined by a kinetic scheme that considers transfer between elements in organic material, colloidal suspension and seawater compartments (Rodríguez-Romero et al, 2019).…”

Section: Kinetic Modelmentioning

confidence: 99%

Penguin Guano Trace Metals Release to Antarctic Waters: A Kinetic Modelling

Gutiérrez

Sparaventi²,

Galán

et al. 2023

Preprint

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“…Indeed, one-third of the main land surface is covered by ultramafic substrates rich in nickel, iron, chrome, cobalt, and manganese trace metals but poor in nitrogen, phosphorus, and potassium (Pelletier 2007, Merrot 2019. These metals are naturally present in coastal ecosystems due to leaching and natural erosion via ultramafic catchments (Bird et al 1984, Biscéré et al 2017, Merrot et al 2022. However, owing to anthropic activities such as urbanisation and particularly mining operation, metal concentrations have increased over the last decades due to large amounts of terrestrial discharge in the coastal ecosystems (Biscéré et al 2015, Merrot et al 2022.…”

Section: Introductionmentioning

confidence: 99%

Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

MÉRIOT,

ROUSSEL,

BRUNET

et al. 2024

Photosynt.

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RC -reaction center; rDNA -ribosomal deoxyribonucleic acid; RLC -rapid light curves; ROS -reactive oxygen species. Acknowledgments: The authors acknowledge Ifremer for supporting the Maorix project, Cresica for supporting the MICROCOMET project, and the South Province of New Caledonia for financing the PhD fellowship of V. Meriot and for delivering the sampling authorization (20274-2019/2-ISP/DENV). We would like to thank Adecal Technopole for its technical support. †

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Bioavailability of chromium, nickel, iron and manganese in relation to their speciation in coastal sediments downstream of ultramafic catchments: A case study in New Caledonia

Cited by 10 publications

References 116 publications

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

Subtropical coastal microbiome variations due to massive river runoff after a cyclonic event

Penguin Guano Trace Metals Release to Antarctic Waters: A Kinetic Modelling

Heterocapsa cf. bohaiensis (dinoflagellate): identification and response to nickel and iron stress revealed through chlorophyll a fluorescence

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