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Registros recuperados: 13
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Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) ArchiMer
Bridier, Guillaume; Meziane, Tarik; Grall, Jacques; Chauvaud, Laurent; Sejr, Mikael Kristian; Menneteau, Sylvain; Olivier, Frederic.
Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter sources, quality, and transfers in systems such as fjords can impede predictions of the evolution of benthic-pelagic coupling in response to global warming. Here, sources and quality of particulate organic matter (POM) and sedimentary organic matter (SOM) were characterized along an inner-outer gradient in a High Artic fjord (Young Sound, NE Greenland) exposed to extreme seasonal and physical constraints (ice-melting associated gradients). The influence of the...
Tipo: Text Palavras-chave: Arctic ecosystems; Benthic-pelagic coupling; Organic matter; Climate change; Fatty acids; Stable isotopes; Young Sound.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00492/60318/67180.pdf
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Effect of shear velocity and flow regimes on scallop post-larval detachment feed on two different diets ArchiMer
Gagne, Renee; Tremblay, Rejean; Olivier, Frederic; Pernet, Fabrice; Miner, Philippe; Samain, Jean-francois.
Through biological flume experiments, we studied the effect of shear velocity and attachment period on the percent detachment of Pecten maximus post-larvae of different sizes reared on two experimental diets. The first diet, (Pavlova lutheri, Isochrysis galbana, Chaetoceros calcitrans), which served as a reference diet (PTC), is commonly used in bivalve hatcheries; the second is the PTC diet with the addition of Rhodomonas salina (PTCR). Our results indicate that the detachment of post-larvae fed PTCR diet showed significant interactions between scallop length, attachment period and shear stress, while the post-larvae feed with the PTC diet showed only effect of shear stress factor. Furthermore, post-larvae exposed to various flume velocities showed...
Tipo: Text Palavras-chave: Attachment; Pecten maximus; Benthic boundary layer; Flume; Diet.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00111/22219/20056.pdf
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Fixation des larves de Crepidula fornicata : modalité de sélection de l'habitat en couche limite benthique ArchiMer
Olivier, Frederic; Retiere, Christian.
L'espèce invasive Crepidula fornicata, mollusque gastéropode prosobranche originaire d'Amérique du Nord introduit en France dans les années 1930 (Le Gall 1980, Blanchard 1995), prolifère depuis quelques décennies sur les côtes de la Manche et plus particulièrement dans les zones conchylicoles. Dans le Golfe Normand-Breton, les stocks d'adultes de crépidules sont estimés à 1,6 millions de tonnes, dont plus de 160000 tonnes au sud des îles Chausey (Blanchard 1995, Noël et al. 1995, Blanchard et Ehrhold 1999). Présente en épais tapis, cette espèce qui induit un envasement des fonds (sédimentation accrue, production de biodépôts) et qui est susceptible d'entrer en compétition pour la ressource trophique avec les espèces élevées (moules, huîtres, palourdes ......
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Ano: 2001 URL: http://archimer.ifremer.fr/doc/00104/21517/19098.pdf
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Influence of suspended and off-bottom mussel culture on the sea bottom and benthic habitats: a review ArchiMer
Mckindsey, Christopher W.; Archambault, Philippe; Callier, Myriam; Olivier, Frederic.
Aquaculture is the fastest growing sector of the food industry, raising concerns about the influence of this activity on the environment. We take a holistic approach to review off-bottom and suspended mussel culture effects on the benthic environment and benthic communities. Both longline and "bouchot" mussel culture add much physical structure (infrastructure and mussels) to the environment, altering hydrosedimentary processes by modifying currents and increasing sedimentation locally, and providing habitat for many benthic organisms. Biodeposition from mussels and these organisms increases benthic organic loading and linked biogeochemical processes to influence O(2), pH, redox potentials, dissolved sulphides, and other sediment parameters, benthic...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00044/15489/12963.pdf
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Lipid requirements of the scallop Pecten maximus (L.) during larval and post-larval development in relation to addition of Rhodomonas sauna in diet ArchiMer
Gagne, Renee; Tremblay, Rejean; Pernet, Fabrice; Miner, Philippe; Samain, Jean-francois; Olivier, Frederic.
The main objective of this study was to evaluate the effect of the addition of Rhodomonas salina in the diet of Pecten maximus on growth, survival and metamorphosis success in relation to biochemical content. Food quality is an essential factor in the success of larval, post-larval and juvenile development. A diet rich in polyunsaturated fatty acids present an advantage for growth, survival and metamorphosis success. Larvae and post-larvae fed with the diet containing R. sauna showed a higher accumulation of arachidonic acid (20:4n-6) and generally a lower concentration of docosahexaenoic acid (22:6n-3). Addition of R. sauna in diet was related with higher level of eicosapentaenoic acid (20:5n-3) in larval stages, but lower level in post-larvae. Addition...
Tipo: Text Palavras-chave: Nutrition; Biochemical characteristics; Fatty acids; Sterol profiles.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00019/13045/10205.pdf
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Marine invertebrate fauna of the Chausey archipelago: an annotated checklist of historical data from 1828 to 2008 ArchiMer
Godet, Laurent; Le Mao, Patrick; Grant, Cindy; Olivier, Frederic.
The first updated list of the marine invertebrate fauna of the Chausey archipelago (Normand-Breton Gulf, France) is presented. All publications regarding the natural history of the area, as well as the existing collections of marine invertebrates from 1828 to 2008 were examined. A total of 769 species (including 245 Arthropoda, 197 Mollusca, 146 Polychaeta), have been recorded in this area covering 5000 ha. This species richness is largely the result of the complexity of benthic habitatsof the archipelago and its long history of field work, dating back to the 19(th) Century. The historical data set of this region presents an opportunity to assess long-term changes in nearshore communities and to design conservation sites based on their scientific value.
Tipo: Text Palavras-chave: Chausey; Marine invertebrates; Inventory; Historical data.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00006/11696/8471.pdf
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Match/mismatch between the Mytilus edulis larval supply and seston quality: effect on recruitment ArchiMer
Toupoint, Nicolas; Gilmore-solomon, Lisandre; Bourque, Francois; Myrand, Bruno; Pernet, Fabrice; Olivier, Frederic; Tremblay, Rejean.
We considered Cushing's match/mismatch theory in a heterotrophic environment and hypothesized that settlement and recruitment success in blue mussel are higher when the food supply is rich in polyunsaturated and essential fatty acids (PUFA/EFA). To test this hypothesis, we monitored larval development as well as fatty acid composition in trophic resources during two successive reproductive seasons. The decoupling we found between the presence of competent larvae in the water column and settlement rates strongly suggests that metamorphosis is delayed until conditions are suitable. In both years, the major mussel settlement peak was synchronized with a phytoplanktonic pulse rich in EFA, consisting of a large autotrophic bloom in 2007 and a short but...
Tipo: Text Palavras-chave: Fatty acids; Larval supply; Match/mismatch; Mytilus edulis; Picoeukaryotes; Recruitment; Settlement rate; Trophic settlement trigger.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00098/20923/19676.pdf
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Multiscale patterns in the diversity and organization of benthic intertidal fauna among French Atlantic estuaries ArchiMer
Blanchet, Hugues; Gouillieux, Benoit; Alizier, Sandrine; Amouroux, Jean-michel; Bachelet, Guy; Barille, Anne-laure; Dauvin, Jean-claude; De Montaudouin, Xavier; Derolez, Valerie; Desroy, Nicolas; Grall, Jacques; Gremare, Antoine; Hacquebart, Pascal; Jourde, Jerome; Labrune, Celine; Lavesque, Nicolas; Meirland, Alain; Nebout, Thiebaut; Olivier, Frederic; Pelaprat, Corine; Ruellet, Thierry; Sauriau, Pierre-guy; Thorin, Sebastien.
Based on a parallel sampling conducted during autumn 2008, a comparative study of the intertidal benthic macrofauna among 10 estuarine systems located along the Channel and Atlantic coasts of France was performed in order to assess the level of fauna similarity among these sites and to identify possible environmental factors involved in the observed pattern at both large (among sites) and smaller (benthic assemblages) scales. More precisely this study focused on unraveling the observed pattern of intertidal benthic fauna composition and diversity observed at among-sites scale by exploring both biotic and abiotic factors acting at the among- and within-site scales. Results showed limited level of similarity at the among-site level in terms of intertidal...
Tipo: Text Palavras-chave: Estuaries; Macrozoobenthos; Diversity; Structuring Factors; WFD.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00179/29016/27444.pdf
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Nursery function of coastal temperate benthic habitats: New insight from the bivalve recruitment perspective ArchiMer
Barbier, Pierrick; Meziane, Tarik; Foret, Martin; Tremblay, Rejean; Robert, Rene; Olivier, Frederic.
Marine habitat function has been typically investigated in terms of biogeochemical regulation but rarely in terms of population renewal, which is mainly controlled by recruitment dynamics. The recruitment phase is crucial for organisms with a bentho-pelagic life cycle, such as bivalves, and it regulates the population renewal success. This study provides new insight on the role of temperate benthic habitats on bivalve recruitment, as a function of nursery areas. Six dominant benthic habitats of the Chausey archipelago (Normandy, France) were studied. In each habitat, bivalve recruit assemblages were described at the end of two reproductive seasons. Furthermore, Ostrea edulis juveniles were immerged on each habitat during two months to compare growth...
Tipo: Text Palavras-chave: Benthic habitats; Bivalve recruitment; Nursery function; Ostrea edulis; Fatty acids.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00367/47863/47845.pdf
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Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database ArchiMer
Gallon, Regis K.; Lavesque, Nicolas; Grall, Jacques; Labrune, Celine; Gremare, Antoine; Bachelet, Guy; Blanchet, Hugues; Bonifacio, Paulo; Bouchet, Vincent M. P.; Dauvin, Jean-claude; Desroy, Nicolas; Gentil, Franck; Guerin, Laurent; Houbin, Celine; Jourde, Jerome; Laurand, Sandrine; Le Duff, Michel; Le Garrec, Vincent; De Montaudouin, Xavier; Olivier, Frederic; Orvain, Francis; Sauriau, Pierre-guy; Thiebaut, Eric; Gauthier, Olivier.
This study aims to describe the patterns of soft bottom macrozoobenthic richness along French coasts. It is based on a collaborative database developed by the “Réseau des Stations et Observatoires Marins” (RESOMAR). We investigated patterns of species richness in sublittoral soft bottom habitats (EUNIS level 3) at two different spatial scales: 1) seaboards: English Channel, Bay of Biscay and Mediterranean Sea and 2) 0.5° latitudinal and longitudinal grid. Total observed richness, rarefaction curves and three incidence-based richness estimators (Chao2, ICE and Jacknife1) were used to compare soft bottom habitats species richness in each seaboard. Overall, the Mediterranean Sea has the highest richness and despite higher sampling effort, the English Channel...
Tipo: Text Palavras-chave: Zoobenthos; Species richness; Regional pattern; Latitudinal pattern; Soft-bottom; France.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00376/48769/49166.pdf
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The importance of turbulent kinetic energy on transport of juvenile clams (Mya arenaria) ArchiMer
Redjah, I.; Olivier, Frederic; Tremblay, R.; Myrand, B.; Pernet, Fabrice; Neumeier, U.; Chevarie, L..
Soft-shell clam, Mya arenaria, culture on the east coast of Canada is characterized by high loss following seeding. To evaluate the importance of passive transport due to currents, an experimental flume study was designed. The purpose was to measure the effects of hydrodynamic conditions, substrate, and clam size on dispersal in controlled laboratory condition and to interpret these results in relation to field measurements. Unidirectional currents with gradual increasing velocities (0 to 60 cm s(-1)) were applied to three substrates (muddy sand, medium sand, and coarse sand) in which clams from one of three size classes (10, 15, and 20 mm) had burrowed. We also examined the resulting effects of turbulent kinetic energy on the erosion of medium-grain sand...
Tipo: Text Palavras-chave: Clam transport; Substratum erosion; Unidirectional currents; Turbulence; ADV; Flume.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00014/12507/9368.pdf
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Trophic cues promote secondary migrations of bivalve recruits in a highly dynamic temperate intertidal system ArchiMer
Foret, Martin; Barbier, Pierrick; Tremblay, Rejean; Meziane, Tarik; Neumeier, Urs; Duvieilbourg, Eric; Olivier, Frederic.
Post-settlement dispersal is a key process in the recruitment of bivalves. To assess the role of such secondary migrations and to identify potential associated triggers, we conducted an in situ sampling survey during the summer recruitment period on the bivalve assemblages of a coarse-sediment temperate tidal habitat in the Chausey archipelago (Normandy, France). The dynamics of drifters were studied using three types of settler traps (for example, bedload, pelagic, and sinking transports), and we monitored both the abiotic (hydrological and hydrodynamic conditions) and the trophic (nano- and pico-sized particulate organic matter [POM]; fatty acid composition of POM and sediment organic matter [SOM]) environmental parameters. Such an approach allows the...
Tipo: Text Palavras-chave: Behavior; Bivalve recruits; Post-settlement dispersal; Secondary migrations; Trophic environment.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00475/58662/62406.pdf
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Validation of trophic and anthropic underwater noise as settlement trigger in blue mussels ArchiMer
Jolivet, Aurelie; Tremblay, Rejean; Olivier, Frederic; Gervaise, Cedric; Sonier, Remi; Genard, Betrand; Chauvaud, Laurent.
Like the majority of benthic invertebrates, the blue mussel Mytilus edulis has a bentho-pelagic cycle with its larval settlement being a complex phenomenon involving numerous factors. Among these factors, underwater noise and pelagic trophic conditions have been weakly studied in previous researches. Under laboratory conditions, we tested the hypothesis that picoplankton assimilation by the pediveliger blue mussel larvae acts as a food cue that interacts with anthropic underwater sound to stimulate settlement. We used C-13-labeling microalgae to validate the assimilation of different picoplankton species in the tissues of pediveliger larvae. Our results clearly confirm our hypothesis with a significant synergic effect of these two factors. However, only...
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Ano: 2016 URL: https://archimer.ifremer.fr/doc/00616/72843/72949.pdf
Registros recuperados: 13
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