Impacts of shrimp farm effluent on water quality, benthic metabolism and N-dynamics in a mangrove forest (New Caledonia)

Molnar, Nathalie; Welsh, David T.; Marchand, Cyril; Deborde, Jonathan; Méziane, Tarik

doi:10.1016/j.ecss.2012.07.012

Cited by 95 publications

(49 citation statements)

References 45 publications

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“…In the mangrove studied herein, the influence of the effluents on C, N, and P dynamic as well as on the physico-chemical characteristics of the sediment were already demonstrated (Molnar et al, 2013Aschenbroich et al, 2015). Organic matter exported from shrimp farm stimulated oxygen demand and nutrient regeneration rates.…”

Section: Introductionmentioning

confidence: 93%

“…In contrast to other parts of the world, farms are built on salt flats, developing upstream the mangrove forests, and there were no direct losses of mangroves due to pond construction. However, pond effluents are discharged into the adjacent mangroves, considered to be a "natural biofilter" that can reduce or eliminate impacts on the surrounding World Heritage listed lagoon and coral reef (Thomas et al, 2010;Molnar et al, 2013). The impact and fate of shrimp farm effluents in mangrove ecosystems can be studied using physico-chemical parameters, nutrients concentration, quantity and quality of organic matter.…”

Section: Introductionmentioning

confidence: 99%

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Meiofauna distribution in a mangrove forest exposed to shrimp farm effluents (New Caledonia)

Patrona

Marchand

Hubas

et al. 2016

Marine Environmental Research

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Meiofauna abundance, biomass and individual size were studied in mangrove sediments subjected to shrimp farm effluents in New Caledonia. Two strategies were developed: i) meiofauna examination during the active (AP) and the non-active (NAP) periods of the farm in five mangrove stands characteristics of the mangrove zonation along this coastline, ii) meiofauna examination every two months during one year in the stand the closest to the pond (i.e. Avicennia marina). Thirteen taxonomic groups of meiofauna were identified, with nematodes and copepods being the most abundant ones. Meiofauna abundance and biomass increased from the land side to the sea side of the mangrove probably as a result of the increased length of tidal immersion. Abundance of total meiofauna was not significantly different before and after the rearing period. However, the effluent-receiving mangrove presented twice the meiofauna abundance and biomass than the control one. Among rare taxa, mites appeared extremely sensitive to this perturbation.

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Section: Introductionmentioning

confidence: 93%

Section: Introductionmentioning

confidence: 99%

Meiofauna distribution in a mangrove forest exposed to shrimp farm effluents (New Caledonia)

Patrona

Marchand

Hubas

et al. 2016

Marine Environmental Research

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“…Furthermore, they turnover, transform and export particulate and dissolved organic and inorganic nutrients of terrestrial origin (Molnar et al, 2013), trap and stabilize sediments (Nerot et al, 2009). The annual cycle of inundation of coastal lagoons with cracking sediments is very relevant for the local biogeochemistry of organic matter and phosphorus (Arenas and De la Lanza, 1981).…”

Section: Introductionmentioning

confidence: 99%

Comparison of the Mangrove Soil With Different Levels of Disturbance in Tropical Agua Brava Lagoon, Mexican Pacific

Gutiérrez¹

2016

Appl Ecol Env Res

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Abstract. The texture and geochemical parameters of soil in tropical mangrove ecosystems have been broadly studied, but the effect of environmental stress on mangrove soil with different levels of disturbance has not been established. This study aimed to compare the texture and soil geochemistry of mangrove ecosystems with two levels of disturbance in the tidal basin of Agua Brava Lagoon, National Wetlands Nayarit, Mexico. Forty eight soil samples were collected from two areas of the mangrove ecosystem during an annual cycle; one in high mangrove condition (according to estimated Leaf Area Index) with low disturbance (LD) and the other in poor mangrove condition with high disturbance (HD). Generally, soil texture tends to be softer in LD than HD sites. LD sites had higher concentration of total N and P, organic matter (OM) and organic carbon (OC). HD sites presented an environmental stress with high levels of Ca, Na, salinity and conductivity. We identified four processes that dominate the dynamics of soil in the study area; MO, OC, N relationship and acid-base relationship. In conclusion, the soil conditions of LD and HD sites are dissimilar according to the level of mangrove disturbance, thus demonstrating the importance to maintain healthy mangrove ecosystem.

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“…This large amount may result (i) from its production linked to the high organic matter content; (ii) and/or from the absence of a root system that can uptake it; (iii) and/or eventually from possible dissimilatory nitrate reduction to ammonium (DNRA) processes. In some mangroves of New Caledonia, DNRA can account for 10%-60% of total nitrate reduction [55], and favors nitrogen retention, which otherwise would have been denitrified to ammonium. In addition, organic enrichment and production of dissolved sulfides favor DNRA by inhibiting denitrification.…”

Section: Distribution and Speciation Of Nitrogen Species Along The Mamentioning

confidence: 99%

Concentrations and Fractionation of Carbon, Iron, Sulfur, Nitrogen and Phosphorus in Mangrove Sediments Along an Intertidal Gradient (Semi-Arid Climate, New Caledonia)

Deborde

Marchand

Molnar

et al. 2015

JMSE

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Abstract: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 sulfate. The loss of total Fe observed towards the sea-side may be related to sulfur oxidation and to more intense tidal flushing of dissolved components. Except the organic forms, dissolved N and P concentrations were very low OPEN ACCESSJ. Mar. Sci. Eng. 2015, 3 53beneath Avicennia and Rhizophora stands, probably as a result of their uptake by the root systems. However, in the unvegetated salt-flat, NH4 + can accumulate in organic rich and anoxic layers. This study shows: (i) the evolution of mangrove sediment biogeochemistry along the intertidal zone as a result of the different duration of tidal inundation and organic enrichment; and (ii) the strong links between the distribution and speciation of the different elements.

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Impacts of shrimp farm effluent on water quality, benthic metabolism and N-dynamics in a mangrove forest (New Caledonia)

Cited by 95 publications

References 45 publications

Meiofauna distribution in a mangrove forest exposed to shrimp farm effluents (New Caledonia)

Meiofauna distribution in a mangrove forest exposed to shrimp farm effluents (New Caledonia)

Comparison of the Mangrove Soil With Different Levels of Disturbance in Tropical Agua Brava Lagoon, Mexican Pacific

Concentrations and Fractionation of Carbon, Iron, Sulfur, Nitrogen and Phosphorus in Mangrove Sediments Along an Intertidal Gradient (Semi-Arid Climate, New Caledonia)

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