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Seasonal variation in the antivibrio activity of two organic extracts from two red seaweed: Palmaria palmata and the introduced Grateloupia turuturu against the abalone pathogen Vibrio harveyi ArchiMer
Garcia-bueno, Nuria; Dumay, Justine; Guerin, Thomas; Turpin, Vincent; Paillard, Christine; Stiger-pouvreau, Valerie; Pouchus, Yves-francois; Aitor Marin-atucha, Arnaldo; Decottignies, Priscilla; Fleurence, Joel.
The wide polarity range and highly polar compounds of two selected red seaweed, Grateloupia turuturu and Palmaria palmata were extracted using two different types of solvent, dichloromethane/methanol and methanol/water. Monthly in vitro antibacterial activities were studied using the microplate method against the marine bacteria Vibrio harveyi strain ORM4, known to infect abalone. Inhibition, slowdown and delay of Vibrio harveyi growth were investigated. Polar compounds of seaweed showed an activity against the abalone pathogen. The best activity was recorded from P. palmata collected in spring, with an inhibition of 7.9% of the bacterial growth. Preliminary 1H NMR profiles identified the differences between the extracts.
Tipo: Text Palavras-chave: Antibacterial activity; Abalone disease; Haliotis tuberculata; Red seaweed; Vibrio harveyi.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00617/72875/71929.pdf
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Subtidal Microphytobenthos: A Secret Garden Stimulated by the Engineer Species Crepidula fornicata ArchiMer
Androuin, Thibault; Polerecky, Lubos; Decottignies, Priscilla; Dubois, Stanislas; Dupuy, Christine; Hubas, Cedric; Jesus, Bruno; Le Gall, Erwan; Marzloff, Martin; Carlier, Antoine.
The slipper limpet Crepidula fornicata is an emblematic invasive species along the northeast Atlantic coast. This gregarious gastropod lives in stacks of several individuals and forms extended beds in shallow subtidal areas. The effects of this engineer species on the colonized habitat can be physical (e.g., presence of hard-shell substrates with uneven topography) or biological (e.g., nutrient enrichment by direct excretion or via biodeposition). We hypothesized that through biological activity, nutrient fluxes at the sediment-water interface are enhanced, leading to stimulated primary productivity by microphytobenthos (MPB) associated with Crepidula beds. To test this fertilization hypothesis, we conducted a 10-day mesocosm experiment using C. fornicata...
Tipo: Text Palavras-chave: Crepidula fornicata; Engineer species; Subtidal microphytobenthos; Fertilization; Hyperspectral imaging.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00472/58338/60893.pdf
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The dark side of soft tissues: unexpected inorganic carbonate in the invasive slipper limpet Crepidula fornicata and its implications for stable isotope interpretations ArchiMer
Androuin, Thibault; Dubois, Stanislas; Decottignies, Priscilla; Pelleter, Ewan; Carlier, Antoine.
Rationale Stable isotopic analysis is extensively used in trophic ecology. Inorganic carbonates, usually originating from shell fragments, are routinely removed from samples using an acid treatment because they affect δ13C values. However, acid treatment can also change δ15N values. For some taxa such as molluscs, the general assumption is that acid pre‐treatment is not necessary since their shell is easily dissected from soft tissues and represents the only source of inorganic carbonates. However, other sources of non‐dietary carbon (e.g., intracellular inorganic carbon) enriched in 13C thus get overlooked. Methods Soft tissues (foot) of the invasive gastropod Crepidula fornicata of different size classes were analysed for their δ13C and δ15N values with...
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Ano: 2019 URL: https://archimer.ifremer.fr/doc/00464/57602/59798.pdf
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There's no harm in having too much: A comprehensive toolbox of methods in trophic ecology ArchiMer
Majdi, Nabil; Hette-tronquart, Nicolas; Auclair, Etienne; Bec, Alexandre; Chouvelon, Tiphaine; Cognie, Bruno; Danger, Michael; Decottignies, Priscilla; Dessier, Aurélie; Desvilettes, Christian; Dubois, Stanislas; Dupuy, Christine; Fritsch, Clémentine; Gaucherel, Cédric; Hedde, Mickaël; Jabot, Franck; Lefebvre, Sebastien; Marzloff, Martin; Pey, Benjamin; Peyrard, Nathalie; Powolny, Thibaut; Sabbadin, Régis; Thébault, Elisa; Perga, Marie-elodie.
Trophic ecology is the study of feeding interactions and food acquisition by organisms. It includes the causes and consequences of those behaviours at all levels of biological organisation. As a field of research, it crosses many disciplinary boundaries and provides knowledge that is pertinent to many other areas of ecology. Here we list and categorise the methods available to trophic ecologists whose toolbox has broadened considerably in recent years. They encompass empirical and numerical approaches with focus ranging from molecules to ecosystems. We further examine the relationship of each method to features such as the scale of observation (from microbes to largest organisms) and organisational level (from individuals to ecosystems) as well as the...
Tipo: Text Palavras-chave: Food web; Feeding interactions; Flux of energy; Computer simulations; Trophic models.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00487/59834/65986.pdf
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Tissue-Specific Biomarker Responses in the Blue Mussel Mytilus spp. Exposed to a Mixture of Microplastics at Environmentally Relevant Concentrations ArchiMer
Revel, Messika; Lagarde, Fabienne; Perrein-ettajani, Hanane; Bruneau, Mélanie; Akcha, Farida; Sussarellu, Rossana; Rouxel, Julien; Costil, Katherine; Decottignies, Priscilla; Cognie, Bruno; Châtel, Amélie; Mouneyrac, Catherine.
The impact of a microplastic (MP) mixture composed of polyethylene (PE) and polypropylene (PP) plastic particles, prepared from commercially available products, was evaluated in blue mussels Mytilus spp. exposed to three environmentally relevant concentrations: 0.008 μg L−1 (low), 10 μg L−1 (medium), and 100 μg L−1 (high). Organisms were exposed for 10 days followed by 10 days of depuration in clean seawater under controlled laboratory conditions. The evaluation of MP effects on mussel clearance rate, tissue structure, antioxidant defenses, immune and digestive parameters, and DNA integrity were investigated while the identification of plastic particles in mussel tissues (gills, digestive gland, and remaining tissues), and biodeposits (feces and...
Tipo: Text Palavras-chave: Microplastics; Polyethylene; Polypropylene; Mytilus; Oxidative stress; Biomarkers.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00489/60089/63427.pdf
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