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Registros recuperados: 12
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Assessment of bacterial dependence on marine primary production along a northern latitudinal gradient ArchiMer
Fouilland, Eric; Le Floc'H, Emilie; Brennan, Debra; Bell, Elanor M.; Lordsmith, Sian L.; Mcneill, Sharon; Mitchell, Elaine; Brand, Tim D.; Garcia-martin, E. Elena; Leakey, Raymond J. G..
Recent observations in polar marine waters have shown that a large fraction of primary production may be lost to respiration by planktonic bacteria due to very low bacterial growth efficiencies in cold waters. Here we report that sea temperature may be a key factor influencing the interaction between bacteria and primary production in North Atlantic and Arctic waters, suggesting that low primary production rates could not sustain bacterial carbon demand in the coldest Arctic waters. The use of freshly produced phytoplankton exudate by bacteria in early- and mid-summer was assessed, together with the bacterial uptake of dissolved inorganic nitrogen (DIN = nitrate and ammonium), in surface waters along a latitudinal gradient from the North Sea to the Arctic...
Tipo: Text Palavras-chave: Carbon coupling; Arctic waters; Phytoplankton and bacteria interactions; Nitrogen fluxes.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00453/56417/58087.pdf
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Bioremediation of fishpond effluent and production of microalgae for an oyster farm in an innovative recirculating integrated multi-trophic aquaculture system ArchiMer
Li, Meng; Callier, Myriam; Blancheton, Jean-paul; Galès, Amandine; Nahon, Sarah; Triplet, Sebastien; Geoffroy, Thibault; Menniti, Christophe; Fouilland, Eric; Roque D'Orbcastel, Emmanuelle.
Integrated multi-trophic aquaculture (IMTA) systems are a promising solution for sustainable aquaculture combining nutrient recycling with increased biomass production. An innovative land-based recirculating aquaculture system (RAS) was studied in France for a 60-day experiment. It combined a European sea bass (Dicentrarchus labrax) RAS with two other production systems: high rate algal ponds (HRAP) with natural marine polyspecific algal assemblages, and oysters in separate open tanks. The objective was the assessment of: 1) the efficiency and the stability of the microalgae bioremediation of the effluent from a fish RAS in spring and summer, 2) the abundance and the diversity patterns of the microalgae biomass for consumption in the oyster compartment of...
Tipo: Text Palavras-chave: Microalgae; IMTA; Nutrient bioremediation; Community structure; Oysters.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00480/59207/61900.pdf
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Carbon conversion efficiency and population dynamics of a marine algae–bacteria consortium growing on simplified synthetic digestate: First step in a bioprocess coupling algal production and anaerobic digestion ArchiMer
Vasseur, Christophe; Bougaran, Gael; Garnier, Matthieu; Hamelin, Jérôme; Leboulanger, Christophe; Le Chevanton, Myriam; Mostajir, Behzad; Sialve, Bruno; Steyer, Jean-philippe; Fouilland, Eric.
Association of microalgae culture and anaerobic digestion seems a promising technology for sustainable algal biomass and biogas production. The use of digestates for sustaining the growth of microalgae reduces the costs and the environmental impacts associated with the substantial algal nutrient requirements. A natural marine algae–bacteria consortium was selected by growing on a medium containing macro nutrients (ammonia, phosphate and acetate) specific of a digestate, and was submitted to a factorial experimental design with different levels of temperature, light and pH. The microalgal consortium reached a maximum C conversion efficiency (i.e. ratio between carbon content produced and carbon supplied through light photosynthetic C conversion and acetate)...
Tipo: Text Palavras-chave: Optimization; Nannochloris; Heterotrophic bacteria; Anaerobic digestion; Bioenergy.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00085/19642/17419.pdf
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Demonstration of facilitation between microalgae to face environmental stress ArchiMer
Krichen, Emna; Rapaport, Alain; Le Floc'H, Emilie; Fouilland, Eric.
Positive interactions such as facilitation play an important role during the biological colonization and species succession in harsh or changing environments. However, the direct evidence of such ecological interaction in microbial communities remains rare. Using common freshwater microalgae isolated from a High Rate Algal Pond HRAP treating wastewaters, we investigated with both experimental and modeling approaches the direct facilitation between two algal strains during the colonization phase. Our results demonstrate that the first colonization by microalgae under a severe chemical condition arose from the rapid growth of pioneer species such as Chlorella sorokiniana, which facilitated the subsequent colonization of low growth specialists such as...
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00592/70434/68528.pdf
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Etude d'une méthode d'échantillonnage des populations de chevrettes (Macrobrachium lar. et M. australe) des rivières de Nuku Hiva (Marquises, Polynésie française) IRD
Fouilland, Eric.
Une méthode d'échantillonnage des #Macrobrachium$, macrocrustacés dulçaquicoles, est étudiée dans le cadre d'un suivi de la faune non cible aux traitements des rivières de l'île de Nuku-Hiva (Marquises) visant l'éradication du "nono noir des vallées" (#Simulim buissoni$). Plusieurs engins de pêche ont été étudiés dont de petites nasses fabriquées à l'aide de bouteilles plastiques. Le "comportement" de ces bouteilles en regard des captures échantillonnées est abordé par comparaison avec les captures d'autres types de pièges (grandes nasses et pêche électrique), divers types de bouteilles (appâtées, colorées), et différentes orientations des bouteilles dans la rivière. L'abondance des captures est analysée en fonction de l'échappement et des fluctuations de...
Tipo: Text Palavras-chave: EAU DOUCE; FAUNE NON CIBLE; ECHANTILLONNAGE; METHODE DE CAPTURE; ENGIN PECHE; EXPERIMENTATION; ANALYSE STATISTIQUE; DENSITE DE POPULATION; CRUSTACE; CHEVRETTE.
Ano: 1993 URL: http://www.documentation.ird.fr/hor/fdi:38943
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Fish, Algae, and Oysters: The Winning Trio in Aquaculture ArchiMer
Roque D'Orbcastel, Emmanuelle; Boudin, Elyse; Li, Meng; Carcaillet, Frédérique; Fouilland, Eric.
Most older methods of fish farming, or aquaculture, have focused on growing only a single species of sea life, for example, salmon. Modern aquaculture systems involve the cultivation of two or more species together, based on what happens normally in the food chain, so that one species can provide a source of food for another species in the farm. This article describes the results of an experiment combining fish culture with algae culture and oyster culture. We show that algae can grow using fish waste, and oysters can eat algae to produce good-quality, healthy food, which reduces the pollution generated by aquaculture.
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00595/70702/68909.pdf
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Heterotrophic Bacteria Show Weak Competition for Nitrogen in Mediterranean Coastal Waters (Thau Lagoon) in Autumn ArchiMer
Trottet, Aurore; Leboulanger, Christophe; Vidussi, Francesca; Pete, Romain; Bouvy, Marc; Fouilland, Eric.
The importance of heterotrophic bacteria relative to phytoplankton in the uptake of ammonium and nitrate was studied in Mediterranean coastal waters (Thau Lagoon) during autumn, when the Mediterranean Sea received the greatest allochthonous nutrient loads. Specific inhibitors and size-fractionation methods were used in combination with isotopic N-15 tracers. NO3 (-) and NH4 (+) uptake was dominated by phytoplankton (60 % on average) during the study period, which included a flood event. Despite lower biomass specific NH4 (+) and NO3 uptake rates, free-living heterotrophic bacteria contributed significantly (> 30 %) to total microbial NH4 (+) and NO3 (-) uptake rates in low chlorophyll waters. Under these conditions, heterotrophic bacteria may be...
Tipo: Text Palavras-chave: Bacteria; Phytoplankton; Inhibitors; Size fractionation; Nitrogen uptake; Dissolved inorganic nitrogen.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00314/42497/41907.pdf
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Importance of ecological interactions during wastewater treatment using High Rate Algal Ponds under different temperate climates ArchiMer
Galès, Amandine; Bonnafous, Anaïs; Carré, Claire; Jauzein, Vincent; Lanouguère, Elodie; Le Floc'H, Emilie; Pinoit, Joanna; Poullain, Clothilde; Roques, Cécile; Sialve, Bruno; Simier, Monique; Steyer, Jean-philippe; Fouilland, Eric.
Several studies focused on wastewater treatment in High Rate Algal Ponds (HRAP) suggest that highly variable climatic conditions cause large variations of microalgal biomass productivity. In the present study, we show that similar carbon, nitrogen and phosphorus removal efficiencies were reached in different HRAPs treating urban wastewaters located in two different temperate (Mediterranean and oceanic) climates. Furthermore, similar ecological successions were observed in these HRAPs. During the start-up phase, the consumption of organic matter by detritivores, already present in the wastewater, appears to be necessary for the microalgae to grow within two weeks in spring. The growth of the rapid-growing species, Chlorella sp., followed by the...
Tipo: Text Palavras-chave: Microalgae; Predators; Bacteria; Urban effluents; Ammonia and phosphate removal.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00490/60210/63713.pdf
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Influence of bacteria on the response of microalgae to contaminant mixtures ArchiMer
Fouilland, Eric; Gales, Amandine; Beaugelin, Ines; Lanouguere, Elodie; Pringault, Olivier; Leboulanger, Christophe.
When microalgae are exposed to contaminants, the role of associated bacteria within the phycosphere, the microenvironment surrounding algal cells, remains largely unknown. The present study investigated the importance of algae-associated bacteria on the responses of microalgae growth to metallic and organic toxicant exposure. The effects of a polluted sediment elutriate, and of metal or pesticide mixtures at environmentally relevant concentrations (<10 μg L−1) were assessed on the growth of two microalgae strains: Isochrysis galbana, a prymnesiophyte, and Thalassiosira delicatula, a centric diatom. Both cultures were maintained as axenic or bacterized under similar conditions in batch cultures. In axenic conditions, the metal mixture addition at low...
Tipo: Text Palavras-chave: Microbial interactions; Metallic and pesticide contaminants; Sediments.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00453/56422/58325.pdf
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Influence of nitrogen enrichment on size-fractionated in vitro carboxylase activities of phytoplankton from Thau Lagoon (Coastal Mediterranean Lagoon, France) ArchiMer
Fouilland, Eric; Descolas Gros, Chantal; Collos, Yves; Vaquer A, André; Souchu, Philippe; Gasc, Anne; Bibent, Bertrand; Pons, Virginie.
The influence of dissolved inorganic and organic nitrogen (DIN and DON) enrichments on pools of enzymes responsible for CO2 fixation by the Calvin-Benson (Rubisco) and beta-carboxylation pathways (beta-carboxylases) were studied in a natural plankton assemblage. The plankton community from a coastal Mediterranean lagoon were incubated in situ for 24 h with initially ammonium, nitrate and DON (taurine) enrichments and compared to a control without any enrichment. An increase of small picophytoplankton and diatom biomass was observed in the enriched inorganic nitrogen treatments 7 - 10 h after the initial enrichment. Phytoplankton biomass decreased in the control and under taurine enrichment suggesting an inorganic nitrogen limitation of phytoplankton growth.
Tipo: Text Palavras-chave: Heterotrophy; Autotrophy; Nitrogen enrichments; Size fractionated phytoplankton; Carboxylase activities.
Ano: 2002 URL: http://archimer.ifremer.fr/doc/2002/publication-451.pdf
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Interspecific differences in the effect of fish on marine microbial plankton ArchiMer
Villeger, Sebastien; Fouilland, Eric; Argenty, Jeremy; Bouvier, Corinne; Carre, Claire; Bouvier, Thierry.
The productivity of most marine ecosystems is limited by the availability of dissolved nitrogen (N) and phosphorus (P). Nutrient recycling is therefore a key process for ecosystem functioning. Fish recycle nutrients through the excretion of ammonia and phosphate and can influence the abundance and community structure of primary producers such as phytoplankton. However, the effect of fish on other plankton compartments, and whether all fish species have similar effects, is largely unknown. We used a tank experiment to test how 2 Mediterranean fish species, gilthead seabream Sparus aurata and golden mullet Chelon auratus, with distinctly different N and P excretion rates, can affect the abundance and community structure of 3 plankton compartments:...
Tipo: Text Palavras-chave: Marine fish; Nutrient excretion; Protozooplankton; Phytoplankton; Bacteria.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00584/69659/67585.pdf
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Significance of Plankton Community Structure and Nutrient Availability for the Control of Dinoflagellate Blooms by Parasites: A Modeling Approach ArchiMer
Alves-de-souza, Catharina; Pecqueur, David; Le Floc'H, Emilie; Mas, Sebastien; Roques, Cecile; Mostajir, Behzad; Vidussi, Franscesca; Velo-suarez, Lourdes; Sourisseau, Marc; Fouilland, Eric; Guillou, Laure.
Dinoflagellate blooms are frequently observed under temporary eutrophication of coastal waters after heavy rains. Growth of these opportunistic microalgae is believed to be promoted by sudden input of nutrients and the absence or inefficiency of their natural enemies, such as grazers and parasites. Here, numerical simulations indicate that increasing nutrient availability not only promotes the formation of dinoflagellate blooms but can also stimulate their control by protozoan parasites. Moreover, high abundance of phytoplankton other than dinoflagellate hosts might have a significant dilution effect on the control of dinoflagellate blooms by parasites, either by resource competition with dinoflagellates (thus limiting the number of hosts available for...
Tipo: Text
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00274/38478/36938.pdf
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