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| Deborde, Jonathan; Marchand, Cyril; Molnar, Nathalie; Della Patrona, Luc; Meziane, Tarik. |
| In mangrove ecosystems, strong reciprocal interactions exist between plant and substrate. Under semi-arid climate, Rhizophora spp. are usually predominant, colonizing the seashore, and Avicennia marina develops at the edge of salt-flats, which is the highest zone in the intertidal range. Along this zonation, distribution and speciation of C, Fe, S, N, and P in sediments and pore-waters were investigated. From the land-side to the sea-side of the mangrove, sediments were characterized by I/ increase in: (i) water content; (ii) TOC; (iii) mangrove-derived OM; II/ and decrease in: (i) salinity; (ii) redox; (iii) pH; (iv) solid Fe and solid P. Beneath Avicennia and Rhizophora, TS accumulated at depth, probably as a result of reduction of iron oxides and... |
| Tipo: Text |
Palavras-chave: Mangrove; Zonation; Biogeochemistry; New Caledonia. |
| Ano: 2015 |
URL: https://archimer.ifremer.fr/doc/00251/36252/34802.pdf |
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| Marchand, Cyril; Lallier Verges, E; Baltzer, F; Alberic, P; Cossa, Daniel; Baillif, P. |
| The accumulation of nine heavy metals in fine-grained sediments from the mangrove fringed coast of French Guiana is evaluated. The dynamic features of the South American tropical coastline, from the Amazon to the Orinoco Rivers, result in mangrove sediments being alternately submitted to phases of erosion and net sedimentation a few tens of years long. This process influences the distribution of the heavy metals associated with these frequently re-mobilized deposits. Sedimentary cores and mangrove plant samples were collected, at different seasons, in various swamps characterized by different properties (content of sedimentary organic matter, distance from sea water and fresh water). The ranges of measured concentrations expressed in mu mol g(-1) were the... |
| Tipo: Text |
Palavras-chave: French Guiana; Mangrove; Fe/Mn cycling; Heavy metals. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1041.pdf |
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| Marchand, Cyril; Molnar, N.; Deborde, Jonathan; Della Patrona, Luc; Meziane, Tarik. |
| Coastal tropical shrimp farming may impact the adjacent ecosystems through the release of large quantities of effluents rich in nutrients. In New Caledonia, mangroves are considered as a natural biofilter to reduce impacts on the surrounding World Heritage listed lagoon. Our main objective was to understand the influence of effluent discharge on the biogeochemistry of mangrove sediments. A monitoring of the physico-chemical parameters of mangrove sediments was carried out during a whole year, including active and non active periods of the farm. The parameters studied were: i) benthic primary production (Chl-a concentrations), ii) physico-chemical parameters of sediments (redox potential, pH, salinity, TOC, TN, TS, δ13C and δ15N), iii) concentrations of... |
| Tipo: Text |
Palavras-chave: Shrimp farming; Effluents; Mangrove; Sediment biogeochemistry; New Caledonia. |
| Ano: 2014 |
URL: https://archimer.ifremer.fr/doc/00251/36253/34801.pdf |
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| Marchand, Cyril; Allenbach, Michel; Lallier-verges, Elisabeth; Della Patrona, Luc; Virly, Sabrina; Rataud, Clément. |
| Le présent rapport est constitué de six parties. Dans la 1ère partie, nous donnons quelques généralités introductives sur la mangrove, et plus spécifiquement sur la mangrove de Nouvelle-Calédonie, ainsi que sur notre site d’étude. La 2nde partie est consacrée à l’évaluation de la biodiversité végétale ainsi qu’à la caractérisation de la structure de la formation de mangrove étudiée. La 3ème partie est consacrée à l’étude de la géochimie des sédiments de mangrove, cette section est divisée en 2 sous-parties, l’une concernant les formes azotées, l’autre concernant le carbone et les métaux lourds. La 4ème partie concerne l’étude des assemblages meïobenthiques, qui réagissent fortement à des perturbations de type organique. La 5ème partie est dédiée à la... |
| Tipo: Text |
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| Ano: 2008 |
URL: http://archimer.ifremer.fr/doc/00198/30917/29288.pdf |
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