alexa Seasonal Pattern of the Biogeochemical Properties of Ma
ISSN: 2155-9546

Journal of Aquaculture Research & Development
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Research Article

Seasonal Pattern of the Biogeochemical Properties of Mangrove Sediments Receiving Shrimp Farm Effluents (New Caledonia)

Marchand C1*, Molnar N1,2, Deborde J1, Patrona LD3 and Meziane T2
1IRD, French Research Organization, New Caledonia, France
2UMR Biology of Aquatic Organisms and Ecosystems, National Museum Natural History, CP 53, 61 Rue Buffon, 75231 Paris Cedex 05, France
3Department of Lagons, Ecosystems and Sustainable Aquaculture (LEAD/NC), Ifremer, 101, Promenade Roger Laroque, Centre IRD, BP 2059 – 98846 Nouméa Cedex, New Caledonia, France
Corresponding Author : Marchand C
IRD, UR 206, UMR 7590 – IMPMC
F-98848 New Caledonia, France
Tel: +33637081531
E-mail: [email protected]
Received March 27, 2014;; Accepted June 23, 2014; Published July 03, 2014
Citation: Molnar N, Marchand C, Deborde J, Patrona LD, Meziane T (2014) Seasonal Pattern of the Biogeochemical Properties of Mangrove Sediments Receiving Shrimp Farm Effluents (New Caledonia). J Aquac Res Development 5:262. doi: 10.4172/2155-9546.1000262
Copyright: © 2014 Marchand C, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
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Abstract

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 dissolved nitrogen, iron and phosphorus. A mangrove developing in the same physiographic conditions, presenting the same zonation, and free of anthropogenic input was used as reference. The concentration of benthic Chl-a measured at sediment surface in the effluent receiving mangrove was twice to three times that measured in the control zone whatever the season. We thus suggest that nutrients inputs significantly increased the phytobenthic production in the effluent receiving mangrove during the whole year, even after the cessation of discharges and because of natural seasonal
dynamic of phytobenthos. Although the flow of surface OM was increased, the OM content at depth was not higher than in the control mangrove. However, the contribution of mangrove detritus to the sedimentary organic pool was higher probably as a result of higher density and much greater individual size of the mangrove trees. Unlike the control mangrove sediment, the effluent receiving mangrove sediment was not stratified, redox potential values were high and presence of Fe3+ was detected down to 50 cm depth, probably as a result of a larger root system, allowing a better sediment oxygenation and accentuated OM decomposition processes, and thus limiting ecosystem saturation.

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