Nutrient fluxes between water column and sediments: Potential influence of the pearl oyster culture

Gaertner‐Mazouni, Nabila; Lacoste, Élise; Bodoy, Alain; Peacock, Lisa M.; Rodier, Martine; Langlade, Marie-José; Orempuller, Joel; Charpy, Loïc

doi:10.1016/j.marpolbul.2012.02.013

Cited by 30 publications

(19 citation statements)

References 31 publications

(41 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We consider that extracted Chl a gives a more reliable measure of phytoplankton biomass, and the in vivo gradient observed by Thomas et al (2010) may be due to an increase in fluorescence with depth rather than any real biomass increase. In our case, the homogeneous distribution of Chl a indicates no photoinhibition in the upper layer in agreement with Lefebvre et al (2012) and could be explained (1) by low nutrient inputs from the benthic system at the sedimentwater interface as measured by Gaertner-Mazouni et al (2012):…”

Section: Phytoplankton Distribution Control and Productivitysupporting

confidence: 79%

See 1 more Smart Citation

Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia

Charpy

Rodier²,

Fournier³

et al. 2012

Marine Pollution Bulletin

Self Cite

View full text Add to dashboard Cite

Section: Phytoplankton Distribution Control and Productivitysupporting

confidence: 79%

“…In Ahe, nitrogen fluxes at the water-sediment interface were measured in situ using benthic transparent hemispheres (Gaertner-Mazouni et al, 2012). Maximum values of benthic nitrogen fluxes (DIN) were recorded in stations directly under the influence of pearl oyster culture 32.06 and 35.6 lmol m À2 d -1 .…”

Section: Environmental Conditions and Nutrient Statusmentioning

confidence: 99%

Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia

Charpy

Rodier²,

Fournier³

et al. 2012

Marine Pollution Bulletin

Self Cite

View full text Add to dashboard Cite

“…With an estimated density of 40 pearl oysters per square meter at the farmed site, colonized ropes would thus supply around 70% of the nitrogen requirement for primary production, whereas cleaned pearl oysters would supply only 26%. For comparison, benthic nutrient fluxes under farm influence in Ahe have been shown to contribute a maximum of 30% of the requirement for primary production (Gaertner- Mazouni et al 2012). These results confirm the importance of nutrient regeneration within the water column in comparison with benthic fluxes and stress the necessity of studying in tandem the influence of the 2 compartments.…”

Section: Overall Impact Of Pearl Oyster Long-lines On Nutrient Dynamimentioning

confidence: 99%

“…diazotrophy) are the main sources of nitrogen identified, providing around 10 and 25%, respectively, of the nitrogen demand for primary production (Charpy-Roubaud et al 1990). The indirect influence of pearl oyster cultivation on nutrient regeneration has only recently been investigated with the study of Gaertner- Mazouni et al (2012). These authors reported that benthic nitrogen fluxes were higher in areas below pearl oysters than in noncultivated areas and could contribute up to 28% of the nitrogen demand for primary production.…”

Section: Introductionmentioning

confidence: 99%

Influence of farmed pearl oysters and associated biofouling communities on nutrient regeneration in lagoons of French Polynesia

Lacoste¹,

Gueguen²,

Moullac³

et al. 2014

Aquacult. Environ. Interact.

View full text Add to dashboard Cite

Bivalve cultivation can significantly contribute to nutrient cycling in semi-enclosed ecosystems. We investigated the influence of suspended pearl oyster culture on nutrient regeneration in the water column of 3 oligotrophic lagoons in French Polynesia. The aim of this first study performed in a tropical area was to assess the seasonal variability of nutrient fluxes and to quantify the contribution of biofouling communities. In situ metabolic enclosure systems were used to measure nutrient uptake or release by 'cultivation units' (i.e. 4 pearl oysters with or without associated biofouling). In all 3 study lagoons (Tahiti, Mangareva, Ahe), nutrient fluxes produced by pearl oyster and associated biofouling communities (CR units) were 4-to 6-fold higher than those measured for cleaned pearl oysters. CR units can release dissolved inorganic nitrogen and soluble reactive phosphorus in the water column at a rate of 200 and 50 µmol h −1 , respectively. Trophic level and composition of biofouling communities may explain the variations of fluxes observed between the different islands. At the pearl farm scale (Ahe), pearl oyster long-lines may supply 70% of the inorganic nitrogen demand for primary production, with biofouling communities accounting for 60% of the total nutrient release. Pearl oyster culture enhances nutrient availability and alters stoichiometry, which can strongly modify the dynamics of the planktonic ecosystem.

show abstract

“…However, relatively little is known of the impact of oyster cultures on mineralization processes and nutrient dynamics regarding the phosphorus cycle and including both the speciation of particulate phosphorus forms and dissolved nutrient data (Anschutz et al 2007). Most studies on the impact of oyster cultures on nutrient cycles have mainly focused on nutrient fluxes (Gaertner- Mazouni et al 2012;Hyun et al 2013).…”

Section: Introductionmentioning

confidence: 99%

Impact of Oyster Farming on Diagenetic Processes and the Phosphorus Cycle in Two Estuaries (Brittany, France)

et al. 2014

View full text Add to dashboard Cite

This study aims to compare the impact of oyster cultures on diagenetic processes and the phosphorus cycle in the sediments of the Aber Benoît and the Rivière d'Auray, estuary of Brittany, France. Our results showed clear evidence of the seasonal impact of oyster cultures on sediment characteristics (grain size and organic matter parameters) and the phosphorus cycle, especially in the Aber Benoît. At this site, seasonal variations in sulfide and Fe concentrations in pore waters, as well as Fe-P concentrations in the solid phase, highlighted a shift from a system governed by iron reduction (Reference) to a system governed by sulfate reduction (beneath oyster). This could be partly explained by the increase in labile organic matter (i.e., biodeposits) beneath oysters, whose mineralization by sulfate led to high sulfide concentrations in pore waters (up to 4,475 lmol l -1 ). In turn, sulfide caused an enhanced release of phosphate in the summer, as adsorption sites for phosphate decreased through the formation of iron-sulfide compounds (FeS and FeS 2 ). In the Aber Benoît, dissolved Fe/PO 4 ratios could be used as an indicator of phosphate release into oxic water. Low Fe/PO 4 ratios in the summer indicated higher effluxes of phosphate toward the water column (up to 47 lmol m -2 h -1 ). At other periods, Fe/PO 4 ratios higher than 2 mol/mol indicated very low phosphate fluxes. In contrast, in the Rivière d'Auray, the occurrence of macroalgae, stranding regularly all over the site, clearly masked the impact of oyster cultures on sediment properties and the phosphorus cycle and made the use of Fe/PO 4 ratios more difficult in terms of indicators of phosphate release.

show abstract

Nutrient fluxes between water column and sediments: Potential influence of the pearl oyster culture

Cited by 30 publications

References 31 publications

Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia

Physical and chemical control of the phytoplankton of Ahe lagoon, French Polynesia

Influence of farmed pearl oysters and associated biofouling communities on nutrient regeneration in lagoons of French Polynesia

Impact of Oyster Farming on Diagenetic Processes and the Phosphorus Cycle in Two Estuaries (Brittany, France)

Contact Info

Product

Resources

About