The Experts below are selected from a list of 246 Experts worldwide ranked by ideXlab platform
Nabila Gaertnermazouni - One of the best experts on this subject based on the ideXlab platform.
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nutrient regeneration in the water column and at the sediment water interface in pearl Oyster Culture pinctada margaritifera in a deep atoll lagoon ahe french polynesia
Estuarine Coastal and Shelf Science, 2016Co-Authors: Elise Lacoste, Nabila GaertnermazouniAbstract:Abstract The aim of this work was to provide a first estimation of the overall contribution of pearl Oyster Culture to nutrient regeneration in a deep atoll lagoon. Nutrient release by pearl Oyster Culture in the water column and nutrient fluxes at the sediment–water interface were compared in two contrasted conditions (i.e. under the influence or not of pearl Oyster farming) in the Ahe atoll (French Polynesia). Nitrogen flux intensity was higher in the water column than at the benthic interface. Nitrogen was released at a rate of 31.36 μmol h−1 m−2 in the water column and 12.05 μmol h−1 m−2 at the sediment–water interface. Average phosphorus flux was 2.85 μmol h−1 m−2 at the sediment–water interface and 2.16 μmol h−1 m−2 in the water column. In this deep lagoon, pearl Oyster Culture exerted more influence in the pelagic compartment than at the benthic interface where flux rate seemed not to be influenced by the presence of pearl Oyster Culture. These results demonstrate that it is essential to study these two interfaces in concert when assessing the impact of suspended shellfish farming on nutrient dynamics. Overall, the impact of pearl Oyster Culture may stimulate phytoplankton growth near cultivation areas through the rapid recycling of inorganic nutrients.
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nutrient fluxes between water column and sediments potential influence of the pearl Oyster Culture
Marine Pollution Bulletin, 2012Co-Authors: Nabila Gaertnermazouni, Elise Lacoste, Alain Bodoy, Lisa Peacock, Martine Rodier, Mariejose Langlade, Joel Orempuller, Loic CharpyAbstract:Abstract This study quantifies benthic nutrient fluxes and sedimentation rates in the Ahe Atoll lagoon (French Polynesia), in two stations located under pearl Oyster frames, and two control stations away from the pearl Culture facility. Dissolved inorganic nitrogen fluxes ranged between 2 and 35 μmol N m −2 h −1 and Soluble Reactive Phosphorus varied between −3 and 8.2 μmol P m −2 h −1 . Particulate sedimentation rates beneath the Oysters were approximately five times higher than in the control zone and the percentage of small particles (⩽63 μm) were about the twice. In contrast, sediment composition was similar under and outside the direct influence of Oyster frames. In this ecosystem, where primary production is dependent on the available nitrogen, our study revealed that, while highly variable, benthic fluxes could sometimes contribute up to 28% of the nitrogen demand for primary production.
Elise Lacoste - One of the best experts on this subject based on the ideXlab platform.
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nutrient regeneration in the water column and at the sediment water interface in pearl Oyster Culture pinctada margaritifera in a deep atoll lagoon ahe french polynesia
Estuarine Coastal and Shelf Science, 2016Co-Authors: Elise Lacoste, Nabila GaertnermazouniAbstract:Abstract The aim of this work was to provide a first estimation of the overall contribution of pearl Oyster Culture to nutrient regeneration in a deep atoll lagoon. Nutrient release by pearl Oyster Culture in the water column and nutrient fluxes at the sediment–water interface were compared in two contrasted conditions (i.e. under the influence or not of pearl Oyster farming) in the Ahe atoll (French Polynesia). Nitrogen flux intensity was higher in the water column than at the benthic interface. Nitrogen was released at a rate of 31.36 μmol h−1 m−2 in the water column and 12.05 μmol h−1 m−2 at the sediment–water interface. Average phosphorus flux was 2.85 μmol h−1 m−2 at the sediment–water interface and 2.16 μmol h−1 m−2 in the water column. In this deep lagoon, pearl Oyster Culture exerted more influence in the pelagic compartment than at the benthic interface where flux rate seemed not to be influenced by the presence of pearl Oyster Culture. These results demonstrate that it is essential to study these two interfaces in concert when assessing the impact of suspended shellfish farming on nutrient dynamics. Overall, the impact of pearl Oyster Culture may stimulate phytoplankton growth near cultivation areas through the rapid recycling of inorganic nutrients.
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Nutrient regeneration in the water column and at the sediment–water interface in pearl Oyster Culture (Pinctada margaritifera) in a deep atoll lagoon (Ahe, French Polynesia)
Estuarine Coastal and Shelf Science, 2016Co-Authors: Elise Lacoste, Nabila Gaertner-mazouniAbstract:Abstract The aim of this work was to provide a first estimation of the overall contribution of pearl Oyster Culture to nutrient regeneration in a deep atoll lagoon. Nutrient release by pearl Oyster Culture in the water column and nutrient fluxes at the sediment–water interface were compared in two contrasted conditions (i.e. under the influence or not of pearl Oyster farming) in the Ahe atoll (French Polynesia). Nitrogen flux intensity was higher in the water column than at the benthic interface. Nitrogen was released at a rate of 31.36 μmol h−1 m−2 in the water column and 12.05 μmol h−1 m−2 at the sediment–water interface. Average phosphorus flux was 2.85 μmol h−1 m−2 at the sediment–water interface and 2.16 μmol h−1 m−2 in the water column. In this deep lagoon, pearl Oyster Culture exerted more influence in the pelagic compartment than at the benthic interface where flux rate seemed not to be influenced by the presence of pearl Oyster Culture. These results demonstrate that it is essential to study these two interfaces in concert when assessing the impact of suspended shellfish farming on nutrient dynamics. Overall, the impact of pearl Oyster Culture may stimulate phytoplankton growth near cultivation areas through the rapid recycling of inorganic nutrients.
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nutrient fluxes between water column and sediments potential influence of the pearl Oyster Culture
Marine Pollution Bulletin, 2012Co-Authors: Nabila Gaertnermazouni, Elise Lacoste, Alain Bodoy, Lisa Peacock, Martine Rodier, Mariejose Langlade, Joel Orempuller, Loic CharpyAbstract:Abstract This study quantifies benthic nutrient fluxes and sedimentation rates in the Ahe Atoll lagoon (French Polynesia), in two stations located under pearl Oyster frames, and two control stations away from the pearl Culture facility. Dissolved inorganic nitrogen fluxes ranged between 2 and 35 μmol N m −2 h −1 and Soluble Reactive Phosphorus varied between −3 and 8.2 μmol P m −2 h −1 . Particulate sedimentation rates beneath the Oysters were approximately five times higher than in the control zone and the percentage of small particles (⩽63 μm) were about the twice. In contrast, sediment composition was similar under and outside the direct influence of Oyster frames. In this ecosystem, where primary production is dependent on the available nitrogen, our study revealed that, while highly variable, benthic fluxes could sometimes contribute up to 28% of the nitrogen demand for primary production.
Madeline Changsun Wu - One of the best experts on this subject based on the ideXlab platform.
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marinomonas ostreistagni sp nov isolated from a pearl Oyster Culture pond in sanya hainan province china
International Journal of Systematic and Evolutionary Microbiology, 2006Co-Authors: Peiyuan Qian, Po Keung Wong, Madeline Changsun WuAbstract:A Gram-negative, aerobic, halophilic, neutrophilic, rod-shaped, non-pigmented, polar-flagellated bacterium, UST010306-043T, was isolated from a pearl-Oyster Culture pond in Sanya, Hainan Province, China in January 2001. This marine bacterium had an optimum temperature for growth of between 33 and 37 °C. On the basis of 16S rRNA gene sequence analysis, the strain was closely related to Marinomonas aquimarina and Marinomonas communis, with 97.5–97.7 and 97.1 % sequence similarity, respectively. Levels of DNA–DNA relatedness to the type strains of these species were well below 70 %. Analyses of phylogenetic, phenotypic and chemotaxomonic characteristics showed that strain UST010306-043T was distinct from currently established Marinomonas species. A novel species with the name Marinomonas ostreistagni sp. nov. is proposed to accommodate this bacterium, with strain UST010306-043T (=JCM 13672T=NRRL B-41433T) as the type strain.
Peiyuan Qian - One of the best experts on this subject based on the ideXlab platform.
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Marinomonas ostreistagni sp. nov., isolated from a pearl-Oyster Culture pond in Sanya, Hainan Province, China.
International journal of systematic and evolutionary microbiology, 2020Co-Authors: Peiyuan Qian, Po Keung Wong, Madeline WuAbstract:A Gram-negative, aerobic, halophilic, neutrophilic, rod-shaped, non-pigmented, polar-flagellated bacterium, UST010306-043(T), was isolated from a pearl-Oyster Culture pond in Sanya, Hainan Province, China in January 2001. This marine bacterium had an optimum temperature for growth of between 33 and 37 degrees C. On the basis of 16S rRNA gene sequence analysis, the strain was closely related to Marinomonas aquimarina and Marinomonas communis, with 97.5-97.7 and 97.1 % sequence similarity, respectively. Levels of DNA-DNA relatedness to the type strains of these species were well below 70 %. Analyses of phylogenetic, phenotypic and chemotaxomonic characteristics showed that strain UST010306-043(T) was distinct from currently established Marinomonas species. A novel species with the name Marinomonas ostreistagni sp. nov. is proposed to accommodate this bacterium, with strain UST010306-043(T) (=JCM 13672(T)=NRRL B-41433(T)) as the type strain.
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marinomonas ostreistagni sp nov isolated from a pearl Oyster Culture pond in sanya hainan province china
International Journal of Systematic and Evolutionary Microbiology, 2006Co-Authors: Peiyuan Qian, Po Keung Wong, Madeline Changsun WuAbstract:A Gram-negative, aerobic, halophilic, neutrophilic, rod-shaped, non-pigmented, polar-flagellated bacterium, UST010306-043T, was isolated from a pearl-Oyster Culture pond in Sanya, Hainan Province, China in January 2001. This marine bacterium had an optimum temperature for growth of between 33 and 37 °C. On the basis of 16S rRNA gene sequence analysis, the strain was closely related to Marinomonas aquimarina and Marinomonas communis, with 97.5–97.7 and 97.1 % sequence similarity, respectively. Levels of DNA–DNA relatedness to the type strains of these species were well below 70 %. Analyses of phylogenetic, phenotypic and chemotaxomonic characteristics showed that strain UST010306-043T was distinct from currently established Marinomonas species. A novel species with the name Marinomonas ostreistagni sp. nov. is proposed to accommodate this bacterium, with strain UST010306-043T (=JCM 13672T=NRRL B-41433T) as the type strain.
Jiajang Hung - One of the best experts on this subject based on the ideXlab platform.
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responses of phytoplankton and periphyton to system scale removal of Oyster Culture racks from a eutrophic tropical lagoon
Marine Ecology Progress Series, 2008Co-Authors: Chunhan Huang, Tingchaie Huang, Hueimeei Su, Jiajang HungAbstract:There is great concern about the ecological impacts and benefits of Oyster Culture on estuaries and coastal waters. To examine the effects of the system-scale removal of Oyster Culture racks on phytoplankton and pe- riphyton in a eutrophic tropical lagoon, a long-term study was conducted at 2 to 3 mo intervals from June 2000 to June 2004 (includes the time of complete Oyster Culture removal from Tapong Bay, southwestern Taiwan in June 2002). The abundances, productivities, and community structures of the inner (poorly flushed) and outer (well flushed) regions were compared before and after rack re- moval. Tidal flushing was an important factor regulating the responses of phytoplankton. After rack removal, mean chlorophyll a and maximum gross production (GPmax) rate of phytoplankton increased 4-fold in the in- ner region, but remained unchanged in the outer region and at the control site. Phytoplankton communities in both regions and at the control site were dominated by Bacillariophyta alone before rack removal, but shifted to a co-dominance of Bacillariophyta, Dinophyta, and Cyanobacteria after rack removal. When GPmax rate was normalized to chl a (P B max) and expressed as maximum photosynthetic intensity, no significant difference was detected before and after rack removal in either region. Chl a accumulation rate, GPmax rate, P B max, and dominant species of periphyton did not differ significantly before and after rack removal in either region. Our results sug- gest the effectiveness of top-down control of phytoplank- ton abundances and a reduction in community diversity by Cultured Oysters in this eutrophic lagoon.
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Relative importance of phytoplankton and periphyton on Oyster-Culture pens in a eutrophic tropical lagoon
Aquaculture, 2005Co-Authors: Teng-chung Wang, Hueimeei Su, Jiajang HungAbstract:The relative importance of biomass and productivity of phytoplankton and periphyton on Oyster-Culture pens was quantified from the tidal inlet to the inner region along a transect across a eutrophic tropical lagoon representing a gradient in flushing time over a complete seasonal cycle. Water flushing modified nutrient concentrations in the water column and the responses of phytoplankton and periphyton to nutrient enrichment. Nutrient concentrations were greater at sites in the inner region subject to poor flushing and lower at sites in the outer region subject to fast flushing. Phytoplankton chlorophyll a was greater at sites in the inner region. However, periphyton biomass decreased with increasing flushing times. Daily production rates of phytoplankton were also greater at sites in the inner region, but no significant differences in those of periphyton were observed among the study sites. On the basis of lagoon area, periphyton contributed
