Consulta: creatorFacets:"Sauriau, Pierre-guy"
Registros recuperados: 74
Data/hora: 13/06/2024 05:17:44

Cartographie krigée des mollusques suspensivores compétiteurs trophiques des huîtres du bassin de Marennes-Oléron : l'implications pour la planification de l'échantillonnage
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Bacher, Cedric.
Stock assessement of wild soft-bottom mol/uses has been part of a general approach to shellfish management in oyster farming in Marennes-Oleron Bay. A sampling survey is described as a stratified random sampling after optimum allocation of the sample sire in each stratum. The aim of this study is ta ilIustrate the use of kriging techniques in the case of suspension-feeders. Regarding suspension-feeding molluscs. trophic competitors of the oyster Crassostrea gigas the whole stratified design produced an estimation with a precision around 25%. Then the geostatistical technique. i.e. kriging was used to depict the spatial and variability patterns of several trophic groups. The biomass data are expressed in ash-free. dry-weight units. In addition, the...
Tipo: Text
Palavras-chave: Marennes Oléron; Crassostrea gigas; Krigeage; Suspensivore; Echantillonnage stratifié; Peuplement benthique.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/publication-3055.pdf

Recent invasion of the Japanese oyster drill along the French Atlantic coast: identification of specific molecular markers that differentiate Japanese, Ocinebrellus inornatus, and European, Ocenebra erinacea, oyster drills
Provedor de dados: 5
Autores: Garcia Meunier, Pascale; Martel, Corine; Pigeot, Jacques; Chevalier, Guillemette; Blanchard, Gérard; Goulletquer, Philippe; Robert, Stephane; Sauriau, Pierre-guy.
The direct amplification of length polymorphism technique (DALP) has been used to distinguish species-specific banding patterns in two marine gastropod oyster drills Ocenebra erinacea (Linnaeus, 1758) and Ocinebrellus inornatus (Recluz, 1851). Ocenebra erinacea is the European oyster drill, common along all European coasts. Ocinebrellus inornatus, the Japanese oyster drill, was recorded in oyster growing areas of the Marennes-Oleron Bay (SW France) for the first time in 1995. This new biological invasion could lead to an increase, which must be evaluated, in the predation risk for cultivated species i.e. oysters and blue mussels, and for littoral fishing resources along the French Atlantic coasts. As a result, since specific identification of early life...
Tipo: Text
Palavras-chave: French Atlantic coast; Ocenebra erinacea; Ocinebrellus inornatus; Marine bioinvasions; Molecular markers.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-569.pdf

Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database
Provedor de dados: 5
Autores: 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

Ecological Quality Status of the Marennes-Oléron Bay (SW France): inference from soft-bottom macrozoobenthos monitored in coastal and transitional waters under the E.U. Water Framework Directive
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Cajeri, Pauline; Cottet, Maud; Blanchet, Hugues; Bachelet, Guy; Lavesque, Nicolas; De Montaudouin, Xavier; Dubois, Sophie; Pothier, Anaelle; Auby, Isabelle; Trut, Gilles; Lamouroux, Mélina.
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00212/32308/30729.pdf

Determination of diet in Manila clams by spatial analysis of stable isotopes
Provedor de dados: 5
Autores: Dang, C.; Sauriau, Pierre-guy; Savoye, N.; Caill-milly, Nathalie; Martinez, P.; Millaret, C.; Haure, Joel; De Montaudouin, X.
Spatial changes in the dietary regime of Ruditapes philippinarum from intertidal sediments of Arcachon Bay were depicted by analyzing stable isotope ratios in both its adductor muscles and potential trophic sources. Manila clams were collected from 50 sites in May to June 2006. Dietary reconstruction was based on the IsoSource mixing model, considering trophic enrichments of 3.5%. for carbon and 3.0%. for nitrogen, which were determined experimentally. delta C-13 and delta N-15 values, respectively, averaged -28.2 and 5.2 parts per thousand for riverine particulate organic matter (POM), -20.6 and 4.7 parts per thousand for inner bay phytoplankton, -21.0 and 5.6%. for outer bay phytoplankton, -16.8 and 4.8 parts per thousand. for microphytobenthos, -18.4...
Tipo: Text
Palavras-chave: SW France; Arcachon Bay; Spatial variability; Mixing model; Trophic sources; C and N stable isotopes; Muscle; Ruditapes philippinarum.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/2009/publication-6886.pdf

Angiospermes des côtes françaises Manche-Atlantique. Propositions pour un indicateur DCE et premières estimations de la qualité
Provedor de dados: 5
Autores: Auby, Isabelle; Oger-jeanneret, Helene; Sauriau, Pierre-guy; Hily, Christian; Barille, Laurent.
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00032/14358/11646.pdf

Contrôle de surveillance 2016 DCE de la flore benthique de substrats durs intertidaux de la masse d’eau côtière « Pertuis Breton - FRGC53 ». Macroalgues intertidales en deux saisons au Grouin NE Loix (île de Ré) IR : rapport final des analyses du suivi printanier et du suivi automnal
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Breret, M.; Aubert, F.; Le Duff, M.
La Directive Cadre sur l’Eau 2000/60/CE du 23 octobre 2000 établit un nouveau cadre pour une politique communautaire dans le domaine de l’eau. Elle fixe comme objectif général d’atteindre, à l’horizon 2015, un bon état écologique (biologique et chimique) des masses d’eaux souterraines et de surface, ces dernières incluant les eaux côtières (MEC) et les eaux de transition (MET) (http://envlit.ifremer.fr/surveillance/directive_cadre_sur_l_eau_dce). Le contrôle de surveillance de l’état écologique s’effectue, entre autres éléments biologiques, sur les macrophytes, les phanérogames marines et les invertébrés benthiques. C’est parmi ceux-ci que se trouvent les invertébrés marins habitant des substrats meubles soit de petits fonds (benthos subtidal) soit de la...
Tipo: Text
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00387/49867/50426.pdf

Mise en place de la DCE dans les masses d'eau côtières des Pays de la Loire - Prospection de la flore et de la faune benthiques et proposition d'un réseau de surveillance
Provedor de dados: 5
Autores: Barille, Anne-laure; Harin, Nicolas; Sauriau, Pierre-guy; Truhaud, Nicolas; Oger-jeanneret, Helene.
The Water Framework Directive (WFD) sets an objective of "good condition" for aquatic environments by 2015. Its implementation along the shoreline is the object of a well-established collaboration between the Ministry of Ecology and Sustainable Development (which became the Ministry of Sustainable Ecology, Development and Urban Planning), the Water Agencies and IFREMER. While the MEDD/IFREMER national agreement brings elements of methodology and general knowledge for managing French shoreline policy, it covers only very partially the needs of shoreline politics in Brittany and the Pays de la Loire region, and requires supplementary items linked to the specifics of the Loire-Brittany shoreline: very widespread and numerous water masses due to the presence...
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-2591.pdf

Open atlantic coast of Europe - a century of introduced species into french waters
Provedor de dados: 5
Autores: Goulletquer, Philippe; Bachelet, G; Sauriau, Pierre-guy; Noel, P.
This paper aims to establish a comprehensive Iist of exotic species introduced into Atlantic French waters over the last century as well as their origin, and the vectors involved in the process. At least 104 non indigenous species have been recorded in the Atlantic and Channel coastal wa• ters. Among those species, only a few (Bonamia ostreae, Crepidula fornicata) have resulted in highly significant negative impacts and side-effects on the coastal activity. In contrast, the introduction of the Japanese oyster Crassostrea gigas can be considered to be successful, sustaining a large industry counting more than 4,000 companies and 150,000 tons of yearly production. Over the last decade, French and European laws have strenghtened the controls over exotic...
Tipo: Text
Ano: 2002
URL: https://w3.ifremer.fr/archimer/doc/00000/3100/

Multiscale patterns in the diversity and organization of benthic intertidal fauna among French Atlantic estuaries
Provedor de dados: 5
Autores: 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

Effects of short flexible seagrass     Zostera noltei     on flow, erosion and deposition processes determined using flume experiments
Provedor de dados: 5
Autores: Ganthy, Florian; Soissons, Laura; Sauriau, Pierre-guy; Verney, Romaric; Sottolichio, Aldo.
Innovative flume experiments were conducted in a recirculating straight flume. Zostera noltei meadows were sampled in their natural bed sediments in the field at contrasting stages of their seasonal growth. The aims of this study were: (i) to quantify the combined effects of leaf flexibility and development characteristics of Zostera noltei canopies on their interaction with hydrodynamics; and (ii) to quantify the role of Zostera noltei meadows in suspended sediment trapping and bed sediment resuspension related with changes in hydrodynamic forcing caused by the seasonal development of seagrasses. Velocity within the canopy was significantly damped. The attenuation in velocity ranged from 34 to 87% compared with bare sediments and was associated with a...
Tipo: Text
Palavras-chave: Arcachon Bay; Flexible vegetation; Flow modification; Flume experiments; France; Sediment resuspension; Sediment trapping; Zostera noltei.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00244/35507/34016.pdf

Can molluscan assemblages give insights into Holocene environmental changes other than sea level rise? A case study from a macrotidal bay (Marennes-Oleron, France)
Provedor de dados: 5
Autores: Poirier, Clement; Sauriau, Pierre-guy; Chaumillon, Eric; Allard, Jonathan.
During the Late Holocene, the rate of sea level rise decreased and climate changes, hydrodynamic processes or anthropogenic impacts became predominant parameters governing the sedimentary infill of estuarine environments. The aim of this study is to describe the response of past benthic mollusc communities to these forcing factors. Mollusc skeletal remains were sampled from three 8000, 5500 and 2600 year-long sedimentary records in the Marennes-Oleron Bay (Atlantic Coast, France), where environmental changes have previously been identified thanks to a combination of very high resolution seismic profiles and sedimentological data. Molluscan assemblages successfully record environmental changes, even at the smallest temporal scale. They provide relevant...
Tipo: Text
Palavras-chave: Atlantic Coast; Sediment core; Palaeoenvironment; Death assemblage; Macrofauna.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6833.pdf

Les bigorneaux perceurs des Pertuis Charentais : éléments de biologie - Synthèse des moyens de lutte
Provedor de dados: 5
Autores: Sauriau, Pierre-guy.
En avril 1995, un nouveau bigorneau perceur a été détecté dans le bassin de Marennes Oléron à l'occasion de l' échantillonnage des stocks de crépidules réalisé par le CREMA I'Houmeau à la demande du Conseil Général de Charente-Maritime. Depuis lors, cette espèce a été déterminée comme étant le bigorneau perceur japonais Ocinebrellus inornatus (Récluz, 1851) suite à l'expertise donnée par le Muséum National d'Histoire Naturelle de Paris. L'origine géographique de ce bigorneau perceur est le Pacifique-Ouest (littoral des pays asiatiques). Cette espèce est aussi connue sur les côtes Est du Pacifique où elle a, en effet, été accidentellement introduite dans le Puget Sound (Etat de Washington) dans les années 1920-1925 à la faveur de transferts de naissains...
Tipo: Text
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00424/53545/54405.pdf

Stock assesments of the non-cultivated molluscs in the oyster culture area of Marennes Oleron
Provedor de dados: 5
Autores: Sauriau, Pierre-guy.
A quantitative sampling was made on the non-cultivated molluscs of the soft bottom macrofauna in the bay of Marennes-Oleron. A stratified random sampling, including an optimal allocation strategy. provided adequate data to estimate abundance and biomass (total weight. dry weight and ash-free-dry weight) of each molluscan species. The main stratification factors were respectively the bathymetric levels. the different types of sediment and the differences between natural, oyster-free mud flats and cultivated areas. A Smith Mc-Intyre grab was used to sample the subtidal, shallow areas and the tidal flats as well. The total number of sampling stations was 370. The final estimation of the total weight of benthic molluscs was 14,400  ± 3,000 tons (at 95 %...
Tipo: Text
Palavras-chave: Marennes Oleron; Non cultivated benthic molluscs; Biomass; Stock assessments; Stratrification; Sampling; Marennes Oléron; Molluques benthiques non cultivés; Biomasse; Stocks; Stratification; Echantillonnage.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/publication-2867.pdf

Recherches de paramètres biométriques différenciant les espèces Ocenebra erinacea et Ocinebrellus inornatus
Provedor de dados: 5
Autores: Robert, Stephane; Rossi, Nadege; Le Moine, Olivier; Soletchnik, Patrick; Razet, Daniel; Guilpain, Patrice; Geairon, Philippe; Blouin, Frederic; Sauriau, Pierre-guy.
En complément des travaux réalisés dans le cadre du contrat INVABIO par le LBEM de La Rochelle pour parvenir à une caractérisation génétique de l'espèce Ocinebrellus inornatus, (Garcia-Meunier, 2002). Nous avons étudié la possibilité de caractériser les deux espèces Ocinebrellus inornatus (Récluz, 1851) et Ocenebra erinacea (Linné, 1758) présentent dans le bassin de Marennes-Oléron depuis 1995 (Pigeot et al., 2002) par une approche biométrique différente de celle présentée par Houart (2001) dans son ouvrage. Nous avons abordé cette possibilité de différentiation morpho-biométrique entre les deux espèces au travers de l'épaulement pour faire suite à l'étude de Sauriau (2002), de la surface operculaire, citée par Newman (2000) pour l'étude des cirripèdes et...
Tipo: Text
Palavras-chave: Biométrie; Gastéropode; Ocenebra erinacea; Ocinebrellus inornatus.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00134/24542/22574.pdf

Influence of the mode of macrofauna-mediated bioturbation on the vertical distribution of living benthic foraminifera: First insight from axial tomodensitometry
Provedor de dados: 5
Autores: Bouchet, Vincent; Sauriau, Pierre-guy; Debenay, J.p.; Mermillod-blondin, F; Schmidt, S; Amiard, J.c.; Dupas, B.
We investigated the influence of bioturbation by macrofauna on the vertical distribution of living (stained) benthic foraminifera in marine intertidal sediments. We investigated the links between macrofaunal bioturbation and foraminiferal distribution, by sampling from stations situated on a gradient of perturbation by oyster-farming, which has a major effect on benthic faunal assemblages. Sediment cores were collected on the French Atlantic coast, from three intertidal stations: an oyster farm, an area without oysters but affected by oyster biodeposits, and a control station. Axial tomodensitometry (CT-scan) was used for three-dimensional visualization and two-dimensional analysis of the cores. Biogenic structure volumes were quantified and compared...
Tipo: Text
Palavras-chave: Macrofauna; Living foraminifera; Interspecific interaction; CT scan; Bioturbating modes; Biogenic structures.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6146.pdf

Dynamics of spatial patterns of microphytobenthic biomass: inferences from a geostatistical analyisis of two comprenhensive surveys in Marennes-Oléron Bay (France)
Provedor de dados: 5
Autores: Guarini, Jean-marc; Blanchard, Gerard; Bacher, Cedric; Gros, Philippe; Riera, Pascal; Richard, Pierre; Gouleau, Dominique; Galois, Robert; Prou, Jean; Sauriau, Pierre-guy.
Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chl a m-2) than in January (ca 85 mg chl a m-2). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account for this result , we suggest that...
Tipo: Text
Palavras-chave: Marennes Oleron; Intertidal mudflat; Geostatistics; Spatial distribution; Chrlorophyll a; Microphytobenthos.
Ano: 1998
URL: https://archimer.ifremer.fr/doc/1998/publication-3820.pdf

Spatio-temporal variations in intertidal mudflat erodability: Marennes-Oleron Bay, western France
Provedor de dados: 5
Autores: Orvain, Francis; Sauriau, Pierre-guy; Le Hir, Pierre; Guillou, Gael; Cann, Philippe; Paillard, Michel.
A portable erosion device (ERIS) was deployed in November 2000 and May 2001 to investigate the spatio-temporal variation of fine-grained sediment erosion over a transect on the intertidal mudflats of Marennes-Oleron Bay, western France. The objective was to relate changes in bed erodability over diurnal emersion periods to bioturbation, rapid changes in sediment characteristics, and microphytobenthos biomass.   Macrofaunal assemblages were dominated by the bivalve, Scrobicularia plana, on the upper mudflat, and by the gastropod, Hydrobia ulvae. on the middle mudflat. A power relationship was obtained where tau(cr) was plotted as a function of sediment density. Results from the upper part of the mudflat deviated from this relationship due to bioturbation by...
Tipo: Text
Palavras-chave: EPS; Microphytobenthos; Erodability; Intertidal mudflat; Sediment; Scrobicularia plana; Hydrobia ulvae; Bioturbation; Resuspension; Eris.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3779.pdf

Influence of oyster culture practices and environmental conditions on the ecological status of intertidal mudflats in the Pertuis Charentais (SW France): A multi-index approach
Provedor de dados: 5
Autores: Bouchet, Vincent; Sauriau, Pierre-guy.
The ecological quality status (EcoQ) of intertidal mudflats constrained by Pacific oyster farming was assessed by single (H', AMBI, BENTIX and BOPA) and multimetric (M-AMBI and average score) index approaches in the Pertuis Charentais (SW France). Fifteen sampling stations were monitored seasonally for sedimentological features and macrozoobenthos in 2004. Sediments affected by oyster biodeposits showed organic matter enrichment, and sediments from off-bottom culture sites had higher organic matter contents and lower redox potentials than sediments from on-bottom culture sites. Biotic indices consistently registered responses of macrozoobenthos to organic enrichment but there was only partial agreement between single index-derived EcoQs. The average score...
Tipo: Text
Palavras-chave: Exposed/sheltered; Seasonal variations; Benthic macrofauna; Biotic index; Intertidal mudflats; Oyster farming practices.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4650.pdf

Site n°5. The Pertuis Breton (Bay of Biscay) France
Provedor de dados: 5
Autores: Bodoy, Alain; Martin, Jean-louis; Bacher, Cedric; Haubois, Anne-gaelle; Sauriau, Pierre-guy.
1.This report presents the results of a field study conducted in the ECASA test site nOS in the Pertuis Breton, France. The site is located on the Atlantic West coasts. It is open to the bay of Biscay, but is slightly protected against westerly winds. The bay has been exploited by intertidal mussels culture for centuries. 2. Within the bay, mussels (Mytilus edulis) are cultivated either by the traditional pole technique, around the bay or on longlines in the centre of the bay. The area occupied by these longline s represents 250 ha, and the resulting annual production is 1 000 tonnes of mussels. The average depth at mid tide is of 13.8 m. The sediment is sandy, with a small fraction of mud. 3. The site is subject to several regular monitoring through the...
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/00304/41516/40724.pdf

Stable isotopes changes in the adductor muscle of diseased bivalve Ruditapes philippinarum
Provedor de dados: 5
Autores: Dang, Cecile; De Montaudouin, X.; Savoye, N.; Caill-milly, Nathalie; Martinez, P.; Sauriau, Pierre-guy.
In this article, we show how a disease could bias stable isotope analyzes of trophic networks and propose a strategy in the choice of tissues to be analyzed. In the past few years, a new pathology (brown muscle disease or BMD) affecting the posterior adductor muscle of Ruditapes philippinarum has emerged in Arcachon Bay. BMD induces a necrosis of muscle tissues which become infused by conchiolin and hence calcified. As muscle of mollusks are often used for trophic food webs studies through stable isotopic analyzes, this work investigated the effect of BMD on carbon and nitrogen isotopic ratios of anterior and posterior adductor muscles of clams collected in February and August 2007. Infected clams displayed a lower condition index and a posterior adductor...
Tipo: Text
Palavras-chave: Calcification; Disease; Adductor muscle; Stable isotopes; Ruditapes philippinarum; Clam.
Ano: 2009
URL: https://archimer.ifremer.fr/doc/2009/publication-6270.pdf

Dynamics of particulate organic matter composition in coastal systems: a spatio-temporal study at multi-systems scale
Provedor de dados: 5
Autores: Lienart, Camilla; Savoye, Nicolas; Bozec, Yann; Breton, Elsa; Conan, Pascal; David, Valerie; Feunteun, Eric; Grangere, Karine; Kerherve, Philippe; Lebreton, Benoit; Lefebvre, Sebastien; L'Helguen, Stephane; Mousseau, Laure; Raimbault, Patrick; Richard, Pierre; Riera, Pascal; Sauriau, Pierre-guy; Schaal, Gauthier; Aubert, Fabien; Aubin, Sebastien; Bichon, Sabrina; Boinet, Christophe; Bourasseau, Line; Breret, Martine; Caparros, Jocelyne; Cariou, Thierry; Charlier, Karine; Claquin, Pascal; Cornille, Vincent; Corre, Anne-marie; Costes, Laurence; Crispi, Olivier; Crouvoisier, Muriel; Czamanski, Marie; Del Amo, Yolanda; Derriennic, Herve; Dindinaud, Francois; Durozieri, Maia; Hanquiez, Vincent; Nowaczyk, Antoine; Devesa, Jeremy; Ferreira, Sophie; Fornier, Michel; Garcia, Fabrice; Garcia, Nicole; Geslin, Sandrine; Grossteffan, Emilie; Gueux, Aurore; Guillaudeau, Julien; Guillou, Gael; Joly, Orianne; Lachaussee, Nicolas; Lafont, Michel; Lamoureux, Jezabel; Lecuyer, Eric; Lehodey, Jean-paul; Lemeille, David; Leroux, Cedric; Mace, Eric; Maria, Eric; Pineau, Philippe; Petit, Franck; Pujo-pay, Mireille; Rimelin-maury, Peggy; Sultan, Emmanuelle.
In coastal systems, the multiplicity of sources fueling the pool of particulate organic matter (POM) leads to divergent estimations of POM composition. Eleven systems (two littoral systems, eight embayments and semi-enclosed systems and one estuary) distributed along the three maritime façades of France were studied for two to eight years in order to quantify the relative contribution of organic matter sources to the surface-water POM pool in coastal systems. This study was based on carbon and nitrogen elemental and isotopic ratios, used for running mixing models.  The POM of the estuary is dominated by terrestrial material (93% on average), whereas the POM of the other systems is dominated by phytoplankton (84% on average). Nevertheless, for the latter...
Tipo: Text
Palavras-chave: Particulate organic matter; Coastal systems; C and N stable isotopes; C:N ratio; Mixing model.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00374/48550/48871.pdf

DCE-Benthos - Macroalgues Fixées, Sous-éléments de qualité "Macroalgues Subtidales (et faune associée)" et "Macroalgues Intertidales", Surveillance des MEC et MET du bassin Adour-Garonne, Année 2017
Provedor de dados: 5
Autores: Derrien-courtel, Sandrine; Aubert, Fabien; Breret, Martine; De Casamajor, Marie-noelle; Lissardy, Muriel; Nussbaumer, Marielle; Sanchez, Florence; Sauriau, Pierre-guy.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00514/62585/66934.pdf

Fonctionnement de la nourricerie à sole des pertuis Charentais - Rapport final - Décembre 2010
Provedor de dados: 5
Autores: Biais, Gerard; Leaute, Jean-pierre; Sauriau, Pierre-guy; Loizeau, Veronique; Robert, Serge; Lavesque, Nicolas; Lepareur, Fanny; Aubert, Fabien; Joassard, Lucette; Paticat, François; Roupsard, François.
La sole est la ressource halieutique qui contribue le plus aux débarquements en valeur des pêches réalisées dans le golfe de Gascogne (52 M € en 2007-09). Elle arrive aussi en première place dans les débarquements de la pêche charentaise (8 M € en 2007-09). Une flottille de grands fileyeurs spécialisés dans sa pêche s'est développée dans le golfe de Gascogne, dont certaines des unités les plus performantes sont basées à Royan. Le port de La Cotinière est l'un des premiers pour les débarquements de sole des chalutiers opérant dans le golfe de Gascogne. Cette espèce contribue aussi à l'équilibre financier annuel de nombreux petits bateaux côtiers.
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00304/41547/40755.pdf

Protocoles de suivi stationnel des herbiers à zostères pour la Directive Cadre sur l’Eau (DCE) Zostera marina - Zostera noltei. Version 2
Provedor de dados: 5
Autores: Auby, Isabelle; Sauriau, Pierre-guy; Oger-jeanneret, Helene; Hily, Christian; Dalloyau, Sebastien; Rollet, Claire; Trut, Gilles; Fortune, Mireille; Plus, Martin; Rigouin, Loic.
Tipo: Text
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00186/29685/28059.pdf

First report of Quinqueloculina carinatatriata (Wiesner, 1923) (foraminifera) along the french atlantic coast (Marennes-Oléron bay and ile de Ré)
Provedor de dados: 5
Autores: Bouchet, Vincent; Debenay, Jean-pierre; Sauriau, Pierre-guy.
Large populations of the living benthic foraminifera Quinqueloculina carinatastriata (Wiesner, 1923) are reported for the first time from intertidal mudflats of the French Atlantic coast (Marennes-Oléron Bay and Ile de Ré). Maximum abundance of living specimens was recorded in early autumn. The species was previously described from the Adriatic and Tyrrhenian Seas (central Mediterranean Sea) and reported from the Eastern Mediterranean and Red Seas, as well as tropical and subtropical regions. A survey of available literature to trace records of the species in muddy shallow habitats along the western coasts of Europe and Africa reveals that the species is unrecorded from the Western Mediterranean Sea and is unknown in the eastern Atlantic Ocean from the...
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2587.pdf

Aquaculture marine et littorale
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Merceron, Michel; Goulletquer, Philippe.
Marine fish farming is fairly recent in France and it is still in the process of being developed. On the Atlantic and Channel coasts, it deals mainly with Atlantic salmon (Salma salar), fario trout (Salmonella faria) with l,400 t in 1991, and turbot (Scophthalmus maximus) with 600 t. In Gravelmes a bass (Dicentrarchus labrax) and bream (Sparus auratus) farm (1,000 t) uses water which is heated (Mediterranean production for these two species is around 2,000 t). Although these figures are low compared to French shellfish farming (200,000 t) and foreign fish farms (150,000 t in Norway, for example), they are growing.
Tipo: Text
Palavras-chave: Biocénoses; Conchyliculture; Algoculture; Mesure de Protection; Impact non trophiques; Impact; Aquaculture littorale; Aquaculture marine.
Ano: 1997

Ecological and biological factors controlling the concentrations of trace elements (As, Cd, Cu, Hg, Se, Zn) in delphinids Globicephala melas from the North Atlantic Ocean
Provedor de dados: 5
Autores: Caurant, Florence; Amiard, Jean-claude; Amiard-triquet, Claude; Sauriau, Pierre-guy.
Trace elements (As, Cd, Cu, Hg, Se and Zn) were determined in liver and kidney of pilot whales Globicephala melas Traill, 1809 collected from 7 schools caught at different seasons around the Faroe Islands. These and other biological data at our disposal enabled us to confirm and to define more accurately the relations shown previously between age, sex and trace element concentrations in marine mammals. The most striking features were: (1) the elevated levels of Cd and Hg in pilot whales compared to other marine mammals and to minimum adverse-effect levels established for humans; (2) the biocumulative behaviour of Cd and Hg; (3) the high correlations between Hg and Se, predominantly influenced by age; and (4) the high correlations between Cd and Zn, the...
Tipo: Text
Palavras-chave: Marine mammals; Heavy metals; Interactions.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00196/30766/29149.pdf

Pipetman et bottes en caoutchouc à la recherche d'hôte(s) de Marteilia refringens
Provedor de dados: 5
Autores: Audemard, Corinne; Le Roux, Frédérique; Sauriau, Pierre-guy; Sautour, Benoît; Combes, C.; Coustau, C.; Blachier, Philippe; Berthe, Franck.
Over the last thirty years, the French production of flat oyster Ostrea edulis dropped from15,000 tons/year to 1,500 tons. Marteilia refringens, a parasite of the flat oyster's digestive gland, is partly responsible for this drop. The fight against this pathogen agent requires a better knowledge of its parasitic cycle. The main hypothesis is the existence of a heteroxenous cycle, that is to say a cycle involving more than one host. However, for thirty years this or these hosts have not been found, and the cycle of Marteilia refringens remains unknown.
Tipo: Text
Palavras-chave: Claires ostréicoles; Parasite; Détection; Biologie moléculaire; Marteilia refringens.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/acte-3272.pdf

Numerical analysis of the food web of an intertidal mudflat ecosystem on the Atlantic coast of France
Provedor de dados: 5
Autores: Leguerrier, Delphine; Niquil, Nathalie; Boileau, N; Rzeznik, J; Sauriau, Pierre-guy; Le Moine, Olivier; Bacher, Cedric.
Food web modelling is an ideal way to describe ecosystems, because it accounts for the totality of the relationships between its various components. One difficulty of such an approach, however, lies in the lack of data and information about some ecological relationships, resulting in under-defined systems. Inverse analysis can serve to complete steady-state food webs where the number of direct flow measurements is insufficient relative to the actual number of flows. We applied this method to the intertidal mudflat ecosystem of Brouage (eastern Marennes-Oleron Bay, SW France) and estimated the annual average carbon flows between the compartments of a coupled benthic and pelagic trophic food web from primary producers (microphytobenthos and phytoplankton) to...
Tipo: Text
Palavras-chave: Network analysis; Food web; Inverse analysis; Carbon flow.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-3134.pdf

Environmental and behavioural factors affecting activity in the intertidal gastropod Hydrobia ulvae
Provedor de dados: 5
Autores: Orvain, Francis; Sauriau, Pierre-guy.
Laboratory microcosms were used to investigate the mud snail Hydrobia ulvac (Pennant) bioturbation activities and behavioural changes in response to snail density, algal food, sediment moisture content, light regime and water cover conditions. Density-dependent kinetics of bioturbated muddy areas were described by von Bertalanffy equations, which provided reliable estimates of mud surface covering rates by snail tracks (m(2) h(-1) snail(-1)), Snails need a wet habitat to be active either covered by seawater or by moving in fluid layers for low-tide conditions. Light and microphytobenthic biomass, which are less potent to affect snail activity, are positively interrelated to increase covering rates in the tested chl a concentrations within the range of 1 -...
Tipo: Text
Palavras-chave: Modelling; Intertidal mudflat; Hydrobia ulvae; Environmental factors; Bioturbation; Behaviour.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-3775.pdf

Dynamics and sources of suspended particulate organic matter in the Marennes-Oléron oyster farming bay: Insights from stable isotopes and microalgae ecology
Provedor de dados: 5
Autores: Malet, Nathalie; Sauriau, Pierre-guy; Ryckaert, Mireille; Malestroit, Pascale; Guillou, Gael.
The aim of this study was to distinguish between sources of the complex variety of Marennes-Oléron Bay suspended particulate organic matter (SPOM) contributing to the tropho-dynamics of the Marennes-Oléron oyster farming bay. Basic biomarkers (Chl a, C/N and POC/Chl a ratios), carbon and nitrogen stable isotopes from SPOM were analyzed and the microalgae community was characterized. The sampling strategy was bimonthly from March 2002 to December 2003; samples were taken from an intertidal mudflat. Four main sources contributed to the SPOM pool: terrigenous input from rivers, neritic phytoplankton, resuspended microphytobenthos and periodic inputs from intertidal Zostera noltii meadows. Seasonal fluctuations were observed in both years of the study period:...
Tipo: Text
Palavras-chave: Heatwave; Zostera noltii; Mudflat; Microphytobenthos; Phytoplankton; Suspended particulate organic matter; Marennes Oléron Bay.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4313.pdf

Use of biotic indices in semi-enclosed coastal ecosystems and transitional waters habitats - Implications for the implementation of the European Water Framework Directive
Provedor de dados: 5
Autores: Blanchet, H; Lavesque, Nicolas; Ruellet, T; Dauvin, J; Sauriau, Pierre-guy; Desroy, Nicolas; Desclaux, C; Leconte, M; Bachelet, G; Janson, A; Bessineton, C; Duhamel, S; Jourde, J; Mayot, S; Simon, S; De Montaudouin, X.
This study deals with the application of macrozoobenthos-based biotic indices (BI) within the frame of the implementation of the European Water Framework Directive. More precisely, this study aimed at assessing the performance of five recently developed methodologies (BI) for the assessment of ecological quality status (EcoQ) in two semi-enclosed, sheltered coastal ecosystems and in one transitional water body situated along the Western French coast, namely Marennes-Oleron Bay, Arcachon Bay, and the Seine Estuary. This study showed that these five indices rarely agreed with each other, describing very different pictures of the overall EcoQ of the three study sites. This work also clearly underlined the limitations of these approaches, notably the...
Tipo: Text
Palavras-chave: Transitional waters; Semi enclosed coastal ecosystems; Benthic invertebrates; Directive; European Water Framework; Biotic index.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3987.pdf

Contrôle de surveillance 2016 DCE de la masse d’eau côtière « Pertuis Breton – FRGC53 » et de la masse d’eau de transition « Estuaire du Lay - FRGT30 » pour les suivis stationnels des herbiers de Zostera (Zosterella) noltei
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Aubert, F.; Pineau, P.
La Directive Cadre sur l’Eau 2000/60/CE du 23 octobre 2000 établit un nouveau cadre pour une politique communautaire dans le domaine de l’eau. Elle fixait comme objectif général d’atteindre, à l’horizon 2015, un bon état écologique (biologique et chimique) des masses d’eaux souterraines et de surface, ces dernières incluant les eaux côtières (MEC) et de transition (MET) (http://envlit.ifremer.fr/surveillance/directive_cadre_sur_l_eau_dce). Le contrôle de surveillance de l’état écologique s’effectue entre autres éléments biologiques sur les macrophytes, les macroinvertébrés et les phanérogames marines. C’est parmi celles-ci que se trouvent les herbiers intertidaux de la zostère naine Zostera (Zosterella) noltei Hornemann nommée alternativement Zostera...
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00387/49865/50425.pdf

Recent expansion of the oriental shrimp Palaemon macrodactylus (Crustacea: Decapoda) on the western coasts of France
Provedor de dados: 5
Autores: Lavesque, Nicolas; Bachelet, Guy; Beguer, Melanie; Girardin, Michel; Lepage, Mario; Blanchet, Hugues; Sorbe, Jean-claude; Moderan, Julien; Sauriau, Pierre-guy; Auby, Isabelle.
The invasive oriental shrimp Palaemon macrodactylus Rathbun, 1902 has considerably extended its distribution in transitional waters along the Atlantic and Channel coasts of France during the period 2007-2010. The most probable method of a primary introduction of this species is ballast waters, but passive transport by water currents is also a possible mechanism of colonization (secondary introductions). Palaemon macrodactylus is a powerful invader of transitional waters and these new populations should be monitored in the future to assess any consequences to native species.
Tipo: Text
Palavras-chave: Palaemon macrodactylus; Palaemonidae; Invasive species; Western France; Transitional waters.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00181/29213/27622.pdf

Comparative analysis of the food webs of two intertidal mudflats during two seasons using inverse modelling: Aiguillon Cove and Brouage Mudflat, France
Provedor de dados: 5
Autores: Degre, Delphine; Leguerrier, D; Du Chatelet, E; Rzeznik, J; Auguet, Jean-christophe; Dupuy, Christine; Marquis, E; Fichet, Denis; Struski, Caroline; Joyeux, E; Sauriau, Pierre-guy; Niquil, Nathalie.
Inverse analysis was used to model the food webs of two intertidal mudflat ecosystems: Aiguillon Cove (AC) and Brouage Mudflat (BM) (south-western Atlantic coast, France). The aim of the present study is to describe and compare the functioning of these two ecosystems. The method of inverse analysis has been adapted in order to take into account, in a single calculation, two seasons: spring/summer (mid-March to mid-October) and autumn/winter (the rest of the year). Gathering all available data on the two sites, the most important gaps in knowledge were identified with the help of sensitivity analyses: they concerned mainly the exports of material by grazing fish (such as mullet Liza ramada), resuspension of microphytobenthos, and fluxes linked to microfauna...
Tipo: Text
Palavras-chave: Atlantic coast; Sensitivity analysis; Tidal flat; Inverse analysis; Steady state; Food web.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1863.pdf

A model of fluff layer erosion and subsequent bed erosion in the presence of the bioturbator, Hydrobia ulvae
Provedor de dados: 5
Autores: Orvain, Francis; Le Hir, Pierre; Sauriau, Pierre-guy.
Previous studies have shown that the gastropod Hydrobia ulvae destabilizes the top layers of fine-grained sediments. This process is mediated by the formation of a "biogenic" fluff layer that includes tracks, faecal pellets and mucus. This fluff layer has been shown to be easily resuspended before general bed erosion. In order to examine how fluff layer and bed. erosion interact, flume experiments were performed with fluid sediments of varying water contents. Ten thousand snails were placed and allowed to crawl for 5 h on the sediment surface, and then the resuspended sediment mass was measured in response to step-wise shear stress increases. Two distinct erosion phases were observed: (1) initial resuspension of the fluff layer and (2) the subsequent bed...
Tipo: Text
Palavras-chave: Gastropoda; Erosion sediment; Bioturbation; Cohesive sediment; Marine sediment.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-805.pdf

The influence of sediment cohesiveness on bioturbation effects due to Hydrobia ulvae on the initial erosion of intertidal sediments: A study combining flume and model approaches
Provedor de dados: 5
Autores: Orvain, F; Sauriau, Pierre-guy; Bacher, Cedric; Prineau, Michel.
Laboratory experiments performed in a recirculating flume were designed to quantify the bioturbation influence of the mud snail Hydrobia ulvae, one of the most abundant deposit feeders on European intertidal mudflats. Variations in sediment moisture content that occur between bedforms in shore-normal, ridge and runnel systems of intertidal mudflats were added to the model definition. Sediment erosion thresholds, erosion rates and the microalgal pigment composition of resuspended material were quantified for different H. ulvae densities (0, 1000, 5000, 10 000 and 50 000 snails m(-2)) and applied bed shear stresses. Two different sediment moisture contents were tested. In the absence of macrofauna, recorded turbidities increased up to the maximum applied...
Tipo: Text
Palavras-chave: Model; Flume; Chloropigments; Ridges and tunnels; Mudflat; Sediment; Hydrobia ulvae; Bioturbation; Resuspension.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3774.pdf

First record of the successful invader Palaemon macrodactylus in Arcachon Bay and Charente estuary (SW France)
Provedor de dados: 5
Autores: Lavesque, Nicolas; Bachelet, Guy; Blanchet, Hugues; Moderan, Julien; Sauriau, Pierre-guy; Duquesne, Elise; Auby, Isabelle; Sorbe, Jean-claude.
Tipo: Text
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00181/29214/27623.pdf

Protocoles de suivi stationnel des herbiers à zostères pour la Directive Cadre sur l’Eau (DCE), Zostera marina, Zostera noltii
Provedor de dados: 5
Autores: Auby, Isabelle; Dalloyau, Sébastien; Hily, Christian; Oger-jeanneret, Helene; Plus, Martin; Sauriau, Pierre-guy; Trut, Gilles.
Tipo: Text
Ano: 2013
URL: https://archimer.ifremer.fr/doc/00072/18368/15941.pdf

Contribution to a synopsis of marine species richness in the Pertuis Charentais Sea with new insights in soft-bottom macrofauna of the Marennes-Oleron Bay
Provedor de dados: 5
Autores: De Montaudouin, Xavier; Sauriau, Pierre-guy.
The catalogue of soft-bottom macrofauna in the Marennes-Oleron Bay (French Atlantic coast) has been updated from a benthic survey conducted in April-May 1995. 262 stations were selected using a stratified random strategy based on sediment types and bathymetric levels. 231 soft-bottom macrofauna species were identified. A synopsis of all available literature since the first local marine study published in 1710 by Antoine Ferchauld de Reaumur indicated that 60 benthic species were reported in the Marennes-Oleron Bay for the first time. The sampling effort, i.e. more than 1 station per km(2) and size of the sieving square mesh (1 mm), can partially explain these results. Most of the new recorded species were crustaceans (28 species) and polychaete annelids...
Tipo: Text
Palavras-chave: Pertuis Charentais; Marennes Oleron Bay; Checklist; Species richness; Macrozoobenthos.
Ano: 2000
URL: https://archimer.ifremer.fr/doc/2000/publication-885.pdf

Cinétique d'acquisition du terroir Marennes-Oléron par l'huître creuse Crassostrea gigas : approche par les isotopes stables
Provedor de dados: 5
Autores: Malet, Nathalie; Sauriau, Pierre-guy; Haure, Joel.
Japanese oysters previously reared in controlled conditions were replaced into the Marennes Oléron Bay on intertidal oyster parks during 2002 summertime. Kinetics of carbon and nitrogen isotope ratios was followed in 5 organs (digestive gland, gills, mantle, muscle and gonads). Results confirmed excepted significant  differences in isotopie signatures between organs and revealed differences in the time required reaching equilibrium with the isotopie signatures of local food sources.
Tipo: Text
Palavras-chave: Cinétique; Isotopes stables; Bassin de Marennes Oléron; Crassostrea gigas.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/acte-6526.pdf

Digestibilité de l'algue Skeletonema costatum par la palourde japonaise Ruditapes philippinarum : éléments d'optimisation appliqués à la vénériculture intensive en marais
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; IFREMER - Laboratoire Ecosystèmes Conchylicoles (LEC) La Tremblade; ECOCEAN - Environnement Littoral &amp; Marin La Rochelle.
Le présent rapport se scinde en trois volets. le premier expose la genèse de l'application à l'aquaculture intensive d'une technique employée en agriculture intensive. Le second volet s'attache à comparer les résultats des calculs de taux de digestibilité acquis, d'une part, in vitro sous des conditions de débit circulant et de type nourriture variables et, d'autre part, in situ par prélèvement des palourdes directement dans le système d'élevage. Enfin le dernier volet contient l'analyse des la distribution spatiales des colonies algales de Skeletonema costatum dans une claire ostréicole expérimentale.
Tipo: Text
Palavras-chave: Vénériculture; Marais; Algue; Skeletonema costatum; Digestion; Ruditapes philippinarum; Bivalvia.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/00144/25476/23629.pdf

Modelling the effects of macrofauna on sediment transport and bed elevation: Application over a cross-shore mudflat profile and model validation
Provedor de dados: 5
Autores: Orvain, Francis; Le Hir, Pierre; Sauriau, Pierre-guy; Lefebvre, Sebastien.
Tipo: Text
Palavras-chave: Modelling; Sediment dynamics; Erodability; Bioturbation; Macrofauna; Biota; Sediment stability.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00079/19055/18610.pdf

Estimation du stock de coques (Cerastoderma edule) élevé dans le Traict du Croisic en 2001.
Provedor de dados: 5
Autores: Haure, Joel; Papin, Mathias; Palvadeau, Hubert; Sauriau, Pierre-guy; Nourry, Max; Penisson, Christian; Dupuy, Beatrice; Martin, Jean-louis.
Le Traict du Croisic représente une surface de 650 hectares dont 180 hectares sont dédiés à la conchyliculture. Bien que divers types d’élevage soient pratiqués (huîtres creuses Crassostrea gigas, moules Mytilus edulis, palourdes Venerupis spp.), l’élevage de la coque Cerastoderma edule représente, à lui seul, 140 hectares de concessions soit 76 % de la surface allouée à l’exploitation conchylicole. La production de coques est de 1200 à 2000 tonnes par an, ce qui fait du Traict le premier centre d’élevage et le deuxième producteur français après la baie de Somme où 2500 tonnes par an sont extraites de l’exploitation des gisements naturels (Bonnel, 1986). Il existe peu d’études scientifiques sur l'élevage de la coque dans le Traict du Croisic. Les...
Tipo: Text
Palavras-chave: Crastoderma edule; Coque; Conchyliculture; Stock; Biomasse.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00326/43765/43322.pdf

Structure spatiale et cartographie des peuplements benthiques du bassin de Marennes- Oléron : première approche par la méthode du krigeage
Provedor de dados: 5
Autores: Bacher, Cedric; Sauriau, Pierre-guy.
Les peuplements benthiques du bassin de Marennes-Oléron  ont été échantillonnées au printemps 1984 dans le but d'étudier le stock des compétiteurs  des populations de filtreurs cultivés (huître Crassostrea  gigas et moule Mytilus edulis). 370 échantillons ont été prélevés sur une surface d'étude de 18Okm2 en utilisant un plan aléatoire stratifié. Les résultats ont été regroupés en deux groupes d'espèces ayant des stratégies nutritionnelles différentes (mollusques déposivores ou suspensivores).  Ces deux groupes trophiques ont été cartographiés, après une transformation logarithmique en utilisant la technique du krigeage. Pour chaque groupe  trois modèles de structure spatiale ont été utilisés: covariance généralisée, semi-variogrammme unidirectionnel ou...
Tipo: Text
Palavras-chave: France; Estimation stocks; Structure spatiale; Stratification; Peuplement benthique; Bassin Marennes Oléron; Cartographie; Modélisation.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/acte-6863.pdf

High-throughput phenotyping of health biomarkers in Crassostrea gigas by magnetic resonance imaging
Provedor de dados: 5
Autores: Francois, Cyrille; Quellec, Stéphane; Collewet, Guylaine; Peyramaure, Paul; Musse, Maja; Lamy, Jean-baptiste; Sauriau, Pierre-guy; Haure, Joel.
High-throughput phenotyping of shellfish’s traits constitutes a challenge due to the specificities of aquatic animals. Appropriate measuring tools have often to be developed or adapted, in order to continuously and automatically acquire data of biomarkers of interest. IMAGIGAS project aimed to explore a non-destructive and non-invasive approach by using magnetic resonance imaging (MRI) to monitor at high-throughput two biomarkers (body weight and temperature) of the pacific oyster, before and during infectious challenges by Ostreid Herpesvirus type 1 (OsHV-1). Pacific oysters and OsHV-1 suspension and contaminated seawater were produced at Ifremer facilities. The experiments were conducted in 2016-2017 by three staffs (Ifremer LGPMM, Irstea IRM Food,...
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00404/51553/52153.pdf

Organisation trophique de la malacofaune benthique non cultivée du bassin ostréicole de Marennes-Oléron
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Mouret, Véronique; Rince, Jean-philippe.
Stock assessment of wild soft-bottom molluscs formed part of a study carried out in the Marennes-Oléron oyster-farming bay. The sampling design was based on a stratified random sampling. The results are presented using three descriptors: species richness, abundance and biomass. In spring 1984, wild molluscs corresponded to nearly 20% of oyster-rearing stocks. Knowledge of the feeding behaviour and geographical distribution of the various trophic groups within the bay enables to estimate trophic competition with the cultivated species (Crassostrea gigas and Mytilus edulis). Five trophic groups were specified: suspension-feeders, deposit-feeders,   suspension/deposit feeders, carnivores and herbivores. Their organization in terms of species number seemed to...
Tipo: Text
Palavras-chave: Mollusque benthique; Organisation trophique; Compétition trophique; Suspensivore; Échantillonnage stratifié; Soft-bottom mollusc; Trophic system; Trophic competition; Suspension-feeder; Stratified sampling.
Ano: 1989
URL: http://archimer.ifremer.fr/doc/1988/publication-2874.pdf

Dynamics of particulate organic matter composition in coastal systems: forcing of spatio-temporal variability at multi-systems scale
Provedor de dados: 5
Autores: Lienart, Camilla; Savoye, Nicolas; David, Valerie; Ramond, Pierre; Tress, Paco Rodriguez; Hanquiez, Vincent; Marieu, Vincent; Aubert, Fabien; Aubin, Sebastien; Bichon, Sabrina; Boinet, Christophe; Bourasseau, Line; Bozec, Yann; Breret, Martine; Breton, Elsa; Caparros, Jocelyne; Cariou, Thierry; Claquin, Pascal; Conan, Pascal; Corre, Anne-marie; Costes, Laurence; Crouvoisier, Muriel; Del Amo, Yolanda; Derriennic, Herve; Dindinaud, Francois; Duran, Robert; Durozier, Maia; Devesa, Jeremy; Ferreira, Sophie; Feunteun, Eric; Garcia, Nicole; Geslin, Sandrine; Grossteffan, Emilie; Gueux, Aurore; Guillaudeau, Julien; Guillou, Gael; Jolly, Orianne; Lachaussee, Nicolas; Lafont, Michel; Lagadec, Veronique; Lamoureux, Jezabel; Lauga, Beatrice; Lebreton, Benoit; Lecuyer, Eric; Lehodey, Jean-paul; Leroux, Cedric; L'Helguen, Stephane; Mace, Eric; Maria, Eric; Mousseau, Laure; Nowaczyk, Antoine; Pineau, Philippe; Petit, Franck; Pujo-pay, Mireille; Raimbault, Patrick; Rimmelin-maury, Peggy; Rouaud, Vanessa; Sauriau, Pierre-guy; Sultan, Emmanuelle; Susperregui, Nicolas.
In costal systems, particulate organic matter (POM) results from a multiplicity of sources having their respective dynamics in terms of production, decomposition, transport and burial. The POM pool experiences thus considerable spatial and temporal variability. In order to better understand this variability, the present study employs statistical multivariate analyses to investigate links between POM composition and environmental forcings for a panel of twelve coastal systems distributed along the three maritime regions of France and monitored weekly to monthly for 1 to 8 years. At multi-system scale, two main gradients of POC composition have been identified: a ‘Continent-Ocean’ gradient associated with hydrodynamics, sedimentary dynamics and depth of the...
Tipo: Text
Palavras-chave: Particulate organic matter; Coastal systems; Environmental forcing; Meta-analysis; France.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00433/54471/55848.pdf

Programme de Surveillance DCE/DCSMM-Benthos « macroalgues intertidales » et faune associée du bassin Adour-Garonne : suivis 2018 « Côte Nord Est île d’Oléron », « Estuaires Gironde aval » et prospection « Estuaire Seudre » : rapport final
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Breret, M; Aubert, F.
Tipo: Text
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00593/70501/68652.pdf

Needle in a haystack: involvement of the copepod Paracartia grani, in the life-cycle of the oyster pathogen Marteilia refringens
Provedor de dados: 5
Autores: Audemard, Corinne; Le Roux, Frédérique; Barnaud, Antoine; Collins, Catherine; Sautour, B; Sauriau, Pierre-guy; De Montaudouin, X; Coustau, C; Combes, C; Berthe, Franck.
Marteilia refringens is a major pathogen of the European flat oyster, Ostrea edulis Linnaeus. Since its description, the lifecycle of this protozoan parasite has eluded discovery. Attempts to infect oysters experimentally have been unsuccessful and led to the hypothesis of a complex life-cycle involving several hosts. Knowledge of this life-cycle is of central importance in order to manage oyster disease. However, the exploration of M. refringens life-cycle has been previously limited by the detection tools available and the tremendous number of species to be screened in enzootic areas. In this study, these two restrictions were circumvented by the use of both molecular detection tools and a mesocosm with low biodiversity. Screening of the entire fauna of...
Tipo: Text
Palavras-chave: Experimental transmission; In situ hybridization; PCR; Paracartia grani; Ostrea edulis; Marteilia refringens.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-2778.pdf

Invasion of the eastern Bay of Biscay by the nassariid gastropod Cyclope neritea: origin and effects on resident fauna
Provedor de dados: 5
Autores: Bachelet, G; Simon-bouhet, B; Desclaux, C; Garcia-meunier, P; Mairesse, G; De Montaudouin, X; Raigne, H; Randriambao, K; Sauriau, Pierre-guy; Viard, F.
The distribution area of the nassariid gastropod Cyclope neritea (L.) includes the Mediterranean and the Black Sea, as well as the Atlantic coasts of the southern Iberian Peninsula. The species has spread north to the eastern Bay of Biscay (Arcachon Bay in 1976, Marennes-Oleron area and Morbihan Gulf in 1983-84). This spread might be explained either by (1) a natural spread favoured by environmental changes (e.g. an increase of temperature) or (2) a sudden range expansion due to the introduction of individuals from distant native populations. Molecular genetic analyses based on mitochondrial markers suggest that the present C. neritea population in Arcachon Bay has been introduced, probably unintentionally with oyster transfers, from several source...
Tipo: Text
Palavras-chave: Introduced species; Scavenging gastropods; Population genetics; Interspecific competition; Behaviour parasites.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10848/7582.pdf

Crepidula fornicata L. (mollusque, gastéropode) en baie de Marennes-Oléron : cartographie des fonds par sonar à balayage latéral et estimation du stock
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; Pichocki-seyfried, C; Walker, P; De Montaudouin, Xavier; Palud, Cecile; Heral, Maurice.
Extensive and detailed subtidal ground mapping of the Marennes-Oleron Bay and Fouras-Aix areas was performed with a side-scan sonar. Side-scan sonographs gave a comprehensive view of sedimentological bottom environments and also allowed us to outline locations of grounds colonised by the gastropod mollusc Crepidula fornicata L. with a precise estimate of their surface. A sedimentological map of the centre of the Marennes-Oleron Bay is given, describing spatial organisation of the following four types of sediment: pure mud, fine sand, coarse sand and rocks. Crepidula beds were also recognised on sonographs and were estimated to cover 181 hectares in the Fouras-Aix area and 615 hectares within the Marennes-Oleron Bay. Standard sampling methods were then...
Tipo: Text
Palavras-chave: Crepidula fornicata; Cartographic; Stock; Sonar à balayage latéral; Marennes-OlCron; Crepidula fornicata; Mapping; Stock assessment; Side-scan sonar; Marennes-Oleron Bay.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-854.pdf

Les mollusques invasifs des bassins conchylicoles du littoral Manche-Atlantique : diversité et structure génétiques des populations invasives, compétition avec les taxons indigènes, gestion du risque pour les écosystèmes et la conchyliculture
Provedor de dados: 5
Autores: Bachelet, Pierrre; De Montaudouin, Xavier; Desclaux, C.; Mairesse, G.; Raigne, H.; Randriambao, K.; Garcia Meunier, Pascale; Martel, C.; Pascal, P. Y.; Sauriau, Pierre-guy; Simon-bouhet, Benoît; Robert, Stephane; Geairon, Philippe; Goulletquer, Philippe; Grangere, Karine; Guilpain, Patrice; Le Moine, Olivier; Rossi, Nadege; Seugnet, Jean-luc; Soletchnik, Patrick.
Shellfish areas usually receive a large number of introduced species. During the present project, we specially focused on 4 marine benthic molluscs introduced in shellfish areas along the Channel and Atlantic coasts of France: the gastropods Crepidula fornicata, Ocinebrellus inornatus and Cyclope neritea, and the bivalve Ruditapes philippinarum. Our study was conducted according to three main axes:  (i) the characterization of introduction and expansion patterns of species within their newly colonized area. In the three invasive gastropods  C. fornnicata, C. neritea and 0. inornatus, a high level of genetic diversity was detected in the French populations which indicated a complex process of introduction (with multiple population sources or secondary...
Tipo: Text
Palavras-chave: Recommandations; Transfert; Ecosystèmes marins; Insularité; Expansion; Introduction espèces; Invasions biologiques; Mollusques.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-3305.pdf

Influence of hydro-sedimentary factors on mollusc death assemblages in a temperate mixed tide-and-wave dominated coastal environment: Implications for the fossil record
Provedor de dados: 5
Autores: Poirier, Clement; Sauriau, Pierre-guy; Chaumillon, Eric; Bertin, Xavier.
Mollusc death assemblages were recovered in 98 subtidal sampling stations on the seafloor of the shallow Pertuis Charentais Sea (Atlantic coast of France). Taxonomic composition and spatial distribution of death assemblages were investigated, as well as their response to sediment grain size (field data), bottom shear stress (coupled tide and wave hydrodynamic modelling), and sediment budget (bathymetric difference map) Results showed that molluscs are likely to be reliable paleoenvironmental indicators since death assemblages were able to acquire ecological changes within years (decadal-scale taphonomic inertia), and live-dead agreement inferred from existing data on living benthic communities was high, except close to river mouths and intertidal mudflats...
Tipo: Text
Palavras-chave: Benthos; Estuary; Holocene; Paleoecology; Sediment budget; Taphonomy.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00017/12814/10260.pdf

Cadmium pathways in an exploited intertidal ecosystem with chronic cadmium inputs (Marennes-Oleron, Atlantic coast, France)
Provedor de dados: 5
Autores: Pigeot, J; Miramand, P; Guyot, T; Sauriau, Pierre-guy; Fichet, D; Le Moine, Olivier; Huet, V.
The Marennes-Oleron Bay is subject to chronic pollution by cadmium (Cd) from the Gironde watershed. An ecosystem approach was used to study the fate of cadmium in the different biological compartments. The median Cd concentration was 0.4 mu g g(-1) dry weight for the 63 benthic species measured. When combined with the respective biomasses for the different species studied, we estimated that 7 kg of Cd is partitioned into the soft tissues of the benthic species in the bay. The majority of this cadmium was distributed between primary producers, mainly microphytobenthos (40 %), and suspension-feeders, mainly oysters (40 %). All other benthic species measured were associated with negligible masses of Cd. Two trophic levels contained 98 % of the Cd: 3 kg was...
Tipo: Text
Palavras-chave: Marennes Oleron Bay; Trophic food web; Bioaccumulation; Cadmium; Macrofauna; Microphytobenthos; Macrophytes.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3615.pdf

Satellite and In Situ Monitoring of Chl-a, Turbidity, and Total Suspended Matter in Coastal Waters: Experience of the Year 2017 along the French Coasts
Provedor de dados: 5
Autores: Gohin, Francis; Bryère, Philippe; Lefebvre, Alain; Sauriau, Pierre-guy; Savoye, Nicolas; Vantrepotte, Vincent; Bozec, Yann; Cariou, Thibault; Conan, Pascal; Coudray, Sylvain; Courtay, Gaelle; Françoise, Sylvaine; Goffart, Anne; Hernández Fariñas, Tania; Lemoine, Maud; Piraud, Aude; Raimbault, Patrick; Rétho, Michael.
The consistency of satellite and in situ time series of Chlorophyll-a (Chl-a), Turbidity and Total Suspended Matters (TSM) was investigated at 17 coastal stations throughout the year 2017. These stations covered different water types, from relatively clear waters in the Mediterranean Sea to moderately turbid regions in the Bay of Biscay and the southern bight of the North-Sea. Satellite retrievals were derived from MODIS/AQUA, VIIRS/NPP and OLCI-A/Sentinel-3 spectral reflectance. In situ data were obtained from the coastal phytoplankton networks SOMLIT (CNRS), REPHY (Ifremer) and associated networks. Satellite and in situ retrievals of the year 2017 were compared to the historical seasonal cycles and percentiles, 10 and 90, observed in situ. Regarding the...
Tipo: Text
Palavras-chave: Satellite; Coastal monitoring; Chlorophyll-a; Total suspended matter; Turbidity.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00645/75669/76536.pdf

Impact of the oyster Crassostrea gigas on a microbial community in Atlantic coastal ponds near La Rochelle
Provedor de dados: 5
Autores: Dupuy, Christine; Pastoureaud, Annie; Ryckaert, Mireille; Sauriau, Pierre-guy; Montanie, Hélène.
To assess the in situ impact of oysters Crassostrea gigas on planktonic protist and bacteria communities and the potential contribution of protozoa to their food resource intake, the abundance and the diversity of protists and bacteria were followed in 2 Atlantic coastal ponds, with and without oysters. The protist biomass in such ponds was high, with a maximum in spring of 982 mug C l(-1) and a minimum in winter of 179 pg C l(-1). Whatever the season, the presence of oysters (20 m(-2) corresponding to an average of 23 mg dry weight m(-2)) induced a significant decrease in &gt;5 pm protist abundance. On the contrary, planktonic organisms &lt;5 pm, such as Chlorophyta flagellates and bacteria, developed similarly in both ponds. It can be assumed that such...
Tipo: Text
Palavras-chave: Trophic link; Bacteria; Protists; Microbial food web; Coastal pond; Food source; Oysters; Bivalve.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-822.pdf

Mortalité de Crassostrea gigas dans le bassin de Marennes Oléron. Etude physico chimique du sédiment. Etude du modèle de mortalité "plat-table" de C. gigas dans le bassin de Marennes Oléron. Etude "Dynamo" du projet MOREST
Provedor de dados: 5
Autores: Soletchnik, Patrick; Bouchet, Vincent; Malestroit, Pascal; Seugnet, Jean-luc; Blouin, Frederic; Radford-knoery, Joël; Burgeot, Thierry; Sauriau, Pierre-guy.
In the scope of the study of the "on-bottom/off-bottom" mortality model in the south of the Marennes Oléron Bay, the result of the 2003 multidisciplinary study (Dynamor) appears to be the hypothesis of an acute stress, "ultimate" trigger of the mortality episodes in June. In 2004 we aim to look for the nature of this stress through the physico-chemical analysis of the sediment (Eh, pH, sulphides and ammoniacal nitrogen), the organic matter and chlorophyll load on the surface of the sediment between April and July. Herbicides are also measured in the water column, south of the bay (Seudre), during the same period. A "precocious" (around the first week of June) and "weak" (lower mortality rate on this working site since 1997) mortality peak happens when the...
Tipo: Text
Palavras-chave: Bassin Marennes Oléron; Phytobenthos; Mortalité; Crassostrea gigas; Foraminiferes benthiques; Répartition verticale; Sédiment; Huître; Echantillonnage.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/rapport-3383.pdf

Interacting effects of Hydrobia ulvae bioturbation and microphytobenthos on the erodibility of mudflat sediments
Provedor de dados: 5
Autores: Orvain, Francis; Sauriau, Pierre-guy; Sygut, A; Joassard, Lucette; Le Hir, Pierre.
Microphytobenthos-macrofauna sediment interactions and their effects on sediment erodability were examined in laboratory experiments. Sediment beds were manipulated in a tidal mesocosm to produce diatom mats in exponential or in stationary phases of development after 6, 8 or 11 d of culture. These sediment beds were used in flume experiments to investigate the influence of bioturbation by the gastropod Hydrobia ulvae on both sediment and pigment resuspension as a function of the physiological state of the microphytobenthic mats. In most experiments, only a surface layer was resuspended. A model was used to analyse in detail the contribution of each variable to this surface-layer erosion. Bioturbation was the major factor controlling resuspension, and its...
Tipo: Text
Palavras-chave: Sediment; Bioturbation; Erosion; Model; Hydrobia ulvae; Physiological state; Microphytobenthos; Resuspension.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-3780.pdf

Infection dynamics of Marteilia refringens in flat oyster Ostrea edulis and copepod Paracartia grani in a claire pond of Marennes-Oleron Bay
Provedor de dados: 5
Autores: Audemard, Corinne; Sajus, Marie-céline; Barnaud, Antoine; Sautour, Benoît; Sauriau, Pierre-guy; Berthe, Franck.
The protozoan parasite Marteilia refringens has been partly responsible for the severe decrease in the production of the European flat oyster Ostrea edulis Linnaeus in France since the 1970s. The calanoid copepod Paracartia grani Sars was recently found to be a host for M refringens in French shallow-water oyster ponds ('claires'). This study reconsidered M refringens transmission dynamics in the light of this finding, taking into account not only oyster infection dynamics and environmental factors but also data concerning the copepod host. P. grani population dynamics in the claire under study revealed that this species is the dominant planktonic copepod in this confined ecosystem. During winter, M refringens overwintered in O. edulis, with P. grani...
Tipo: Text
Palavras-chave: Claire pond; Infection dynamics; Paracartia grani; Ostrea edulis; Marteilia refringens.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-2858.pdf

Spatio-temporal differentiation in the population structure of Hydrobia ulvae on an intertidal mudflat (Marennes-Oleron Bay, France)
Provedor de dados: 5
Autores: Haubois, Anne-gaelle; Guarini, Jean-marc; Richard, Pierre; Blanchard, Gerard; Sauriau, Pierre-guy.
Spatio-temporal changes in density, breeding cycle, growth and population structure of Hydrobia ulvae (Gastropoda: Prosobranchia) were studied by monthly sampling of a wide bare mudflat in Marennes-Oleron Bay. Four stations, located along a cross-shore transect and characterized by different geomorphological structures, were investigated from March 2000 to February 2001. Hydrobia ulvae was mainly distributed in the upper half part of the mudflat and no individuals were found in the lower part. The breeding cycle extended from March to December and showed two annual peaks, in spring and in autumn. Three cohorts were recruited during the year and showed high growth rates during summer; the parameters of the von Bertalanffy model describing the growth curves...
Tipo: Text
Palavras-chave: Gastropoda; Mudflat; Spatio temporal change; Population dynamic.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-598.pdf

Réseau trophique du bassin de Marennes-Oléron (rapport 1996). Région Poitou-Charentes
Provedor de dados: 5
Autores: Bacher, Cedric; Blanchard, Gerard; Bougrier, Serge; Cariou-le Gall, Valerie; Delmas, D.; Deslous Paoli, Jean-marc; Dinet, A.; Garet, Marie-josee; Geairon, Philippe; Jonquieres, Gerard; Laisne, A.; Maffei, E.; Montagna, P. A.; De Montaudouin, Xavier; Morin, S.; Richard, P.; Riera, Pascal; Sauriau, Pierre-guy; Vrignaud, N.
Les cartographies annuelles des biomasses microphytobenthiques ont été réalisées pour le bassin de Marennes-Oléron. Parallèlement les cartographies des caractéristiques sédimentaires ont été établies simultanément aux cartes d'abondance et biomasse macrofauniques en portant un effort particulier sur les densités des compétiteurs des huîtres notamment les Crépidules. Simultanément les études des mécanismes contrôlant le réseau trophique sur la vasière de Brouage ont été poursuivies notamment les relations entre les flux de sels nutritifs et le microphytobenthos. L'importance de ce dernier compartiment dans la nutrition de l'huître a été clairement mis en évidence par l'utilisation des traçeurs isotopiques naturels. Enfin, les caractéristiques de filtration...
Tipo: Text
Palavras-chave: Bassin de Marennes Oléron; Microphytobenthos; Physiologie; Crassostrea gigas; Crépidules; Modèle réseau trophique; Cartographie; Charente-Maritime.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00102/21294/18911.pdf

Anthrophisation in introduction d'espèces exogènes: mise en place de l'analyse génétique d'une population invasive de bigorneaux perceurs Ocinebrellus inornatus (Recluz, 1851) dans le bassin de Marennes-Oléron
Provedor de dados: 5
Autores: Garcia-meunier, Pascale; Saab, Lucie; Pigeot, Jacques; Chevalier, Guillemette; Goulletquer, Philippe; Sauriau, Pierre-guy.
bien qu'elles aient existé depuis plusieurs siècles, les invasions biologiques en milieu marin se sont considérablement accélérées durant les dernières décennies, suite à l'accroissement du trafic maritime à travers les océans et aux transferts intercontinentaux d'espèces à des fins d'aquaculture. Ainsi, la découverte dans le bassin de Marennes-Oléron d'une nouvelle espèce de bigorneau perceur Ocinebrellus inornatus (Récluz,1851), originaire du Pacifique asiatique, laisse présager un accroissement des risques de mortalité pour les cheptels cultivés (huître, moule) et pour les ressources de la pêche littorale. Notre premier objectif est avant d'en étudier la dynamique de population d'en définir les caractéristiques génétiques en comparaison de celles de...
Tipo: Text
Palavras-chave: Ocinebrellus inornatus; Invasions biologiques; Pression anthropique; Marqueurs moléculaires; Pertuis Charentais.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00065/17582/15105.pdf

Echantillonnage des populations naturelles de mollusques compétiteurs trophiques des huîtres cultivées Crassostrea gigas du bassin de Marennes-Oléron : aspects méthodologiques
Provedor de dados: 5
Autores: Sauriau, Pierre-guy.
The main problems involved in making biomass and density estimates of benthic mol1uscs are the choice of a sampling plan, the level of systematic errors and random errors. A stratified random sampling after optimum allocation was used in the case. The benthic molluscs estimates (biomass or density) are highly variable, due to their aggregated distribution. The sampling gear used is a Smith Mc-lntyre grab which introduce a bias in the estimates. Nevertheless, the Macoma baLthica community was predominant in the bay but Cerastoderma edul.e appeared to be the dominant specie.
Tipo: Text
Palavras-chave: Cerastoderma edule; Macoma balthica; Marennes Oleron Bay; Crassostrea gigas; Stock assessment; Cerastoderma edule; Macoma balthica; Marennes Oléron; Crassostrea gigas; Echantillonnage.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/acte-2971.pdf

Gestion des bassins conchylicoles
Provedor de dados: 5
Autores: Heral, Maurice; Prou, Jean; Sauriau, Pierre-guy; Goulletquer, Philippe.
The excess of farmed mollusc biomass in some French shellfish-farming basins (Marennes-Oléron basin, Isle of Ré, Isle of Bourgneuf) has been clearly highlighted. This manifests itself as a decrease of growth consistency of the molluscs and an increase in chronic mortality rates not linked to pathogenic agents. To this excess of farmed biomass are added the biomass of oysters or "wild" mussels or biomass linked to abandoned concessions.
Tipo: Text
Palavras-chave: Estimation; Croissance; Biomasse; Conchylicultre.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/acte-3084.pdf

Evaluation du stock de palourdes du bassin d'Arcachon
Provedor de dados: 5
Autores: Bertignac, Michel; Auby, Isabelle; Sauriau, Pierre-guy; De Montaudouin, Xavier; Foucard, Julie; Martin, Sophie.
As part of a larger project financed by the European Union programme "Community initiative PESCA" on the study of "small scale fisheries" in Aquitaine (France), an estimation of the stock of clams in the Bassin d'Arcachon has been conducted. A two-stage stratified random sampling survey has been designed. Samples have been collected using a Hamon bottom sampler in 237 locations distributed over 24 km2. The clam Tapes philippinarum, which appeared in the basin following a series of aquaculture experiments in the mid eighties, is now the main species accounting for more than 90% of the abundance and the biomass, largely overcoming the European species Tapes decussata. The mean abundance and biomass (26 clams / m2 et l28g / m2) are above those estimated in...
Tipo: Text
Palavras-chave: Palourde; Tapes philippinarum; Tapes decussata; Evaluation stock; Pêche; Pêche à pied; Echantillonnage; Bassin d'Arcachon; Clam; Tapes philippinarum; Tapes decussata; Stock assessment; Fishery; Sampling; Bassin d'Arcachon.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00105/21658/19240.pdf

Effects of short-term environmental disturbances on living benthic foraminifera during the Pacific oyster summer mortality in the Marennes-Oléron Bay (France)
Provedor de dados: 5
Autores: Bouchet, Vincent; Debenay, Vincent; Sauriau, Pierre-guy; Radford Knoery, Joel; Soletchnik, Patrick.
Sediment cores were collected from April to August 2004 on tidal mudflats of the macrotidal Marennes-Oléron Bay (SW France), famous for the cultivation of Pacific oysters (Crassostrea gigas). The response of living (stained) benthic foraminifera to short-term biogeochemical disturbances in the sediment and overlying water, which may be involved in oyster summer mortality, was monitored. Short-term hypoxia occurred in early June, in conjunction with a sudden rise in temperature. In mid-June, the ammonia content of sediment porewater increased, leading to potentially maximal flux towards overlying waters. Foraminiferal assemblages, particularly in the topmost layer, were altered. Ammonia tepida was the most tolerant to temperature increase and hypoxic...
Tipo: Text
Palavras-chave: Marennes Oléron bay; Aquaculture; Crassostrea gigas; Intertidal; Ammonium; Hypoxia; Organic matter; Living benthic foraminifera.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2586.pdf

Zostères de Manche-Atlantique : de la DCE aux questions de recherche
Provedor de dados: 5
Autores: Oger-jeanneret, Helene; Trut, Gilles; Ganthy, Florian; Sauriau, Pierre-guy; Budzinski, Hélène; Gonzalez, Patrice; Gamain, Perrine; Maury-brachet, Régine; Feurtet-mazel, Agnès; Auby, Isabelle; Dalloyau, Sébastien; Rollet, Claire; De Casamajor, Marie-noelle; Sanchez, Florence; Rigouin, Loic; Fortune, Mireille; Lejolivet, Aurore; Thevand, Adeline; Grall, Jacques; Hily, Christian; Lamouroux, Mélina; Fera, Philippe.
Tipo: Text
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00310/42085/41387.pdf

Contrôle de surveillance 2017 DCE de la masse d’eau côtière «FRGC53 - Pertuis Breton» et de la masse d’eau de transition «FRGT30 - Estuaire du Lay» pour les herbiers de Zostera (Zosterella) noltei Hornemann : rapport final
Provedor de dados: 5
Autores: Aubert, F.; Sauriau, Pierre-guy; Pineau, P.
Tipo: Text
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00438/54974/56378.pdf

La Crépidule : identifier les mécanismes de sa prolifération et caractériser ses effets sur le milieu pour envisager sa gestion (Chantier : Baie de Marennes-Oléron)
Provedor de dados: 5
Autores: Sauriau, Pierre-guy; De Montaudouin, Xavier; Gomez, Stéphane; Joassard, Lucette; Breret, Martine.
Les points forts des résultats acquis sur le chantier Marennes-Oléron au cours du programme LITEAU Crépidule sont énumérés :  1- Introduite dans le bassin de Marennes-Oléron à la fin des années soixante, Crepidula fornicata y a depuis colonisé principalement les bordures de chenaux et fonds subtidaux répondant à ses exigences écologiques. Ce nouveau biotope représente moins de 13% des surfaces de la baie pour un stock vivant ne dépassant pas quelques milliers de tonnes frais. De plus, du fait des opérations de nettoyage organisées depuis 1980 en baie de Marennes-Oléron, une relative stabilité du stock de crépidule est à noter dans cette baie depuis 25 ans. Ce n’est en revanche pas le cas du site de Fouras, où les opérations de nettoyage ne sont pas...
Tipo: Text
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00032/14293/11572.pdf

La Crépidule : identifier les mécanismes de sa prolifération et caractériser ses effets sur le milieu pour envisager sa gestion (Chantier : Bassin d'Arcachon)
Provedor de dados: 5
Autores: De Montaudouin, Xavier; Sauriau, Pierre-guy; Nauleau, Peggy; Labarraque, Dorothée; Giraud, Karen; Tiozzo, Julien.
Le stock de crépidules dans le Bassin d’Arcachon est estimé à 155 t (poids frais). La faible expansion de cette espèce dans la lagune est sans doute liée à la rareté de son substrat de prédilection (vases subtidales) et à l’interdiction des engins de pêche traînants, agents dispersifs.  Même si les crépidules subissent une légère compétition intraspécifique au niveau du recrutement, la production des populations est proportionnelle à la biomasse, même pour des valeurs de 256 g poids sec m-2, soit 8 kg poids frais m-2. Aucun seuil d’autolimitation n’a donc été détecté.  Les crépidules présentes en milieu sableux ont tendance à envaser le milieu.  La signature isotopique des huîtres et des crépidules suggère certaines sources trophiques communes aux deux...
Tipo: Text
Ano: 2002
URL: http://archimer.ifremer.fr/doc/00032/14289/11568.pdf

Making water flow: a comparison of the hydrodynamic characteristics of 12 different benthic biological flumes
Provedor de dados: 5
Autores: Jonsson, Per R.; Van Duren, Luca A.; Amielh, Muriel; Asmus, Ragnhild; Aspden, Rebecca J.; Daunys, Darius; Friedrichs, Michael; Friend, Patrick L.; Olivier, Frédéric; Pope, Nick; Precht, Elimar; Sauriau, Pierre-guy; Schaaff, Estelle.
Flume tanks are becoming increasingly important research tools in aquatic ecology, to link biological to hydrodynamical processes. There is no such thing as a "standard flume tank", and no flume tank is suitable for every type of research question. A series of experiments has been carried out to characterise and compare the hydrodynamic characteristics of 12 different flume tanks that are designed specifically for biological research. These facilities are part of the EU network BioFlow. The flumes could be divided into four basic design types: straight, racetrack, annular and field flumes. In each facility, two vertical velocity profiles were measured: one at 0.05 m s(-1) and one at 0.25 m s(-1). In those flumes equipped with Acoustic Doppler Velocimeters...
Tipo: Text
Palavras-chave: Methods; Hydrodynamics; Flume tanks; Biological physical interaction; Benthic boundary layer.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2242.pdf

Effect of seasonal variation in trophic conditions and the gametogenic cycle on d13C and d15N levels of diploid and triploid Pacific oysters Crassostrea gigas
Provedor de dados: 5
Autores: Malet, Nathalie; Sauriau, Pierre-guy; Faury, Nicole; Soletchnik, Patrick; Guillou, Gael.
Carbon and nitrogen stable isotopes were investigated in separate organs of diploid and sterile triploid Pacific oysters Crassostrea gigas for 13 mo, together with changes in chemical and isotope composition of suspended matter sampled from an intertidal mudflat within Marennes-Oléron Bay, France. Particulate organic matter (POM) was a mixture of pelagic and benthic material with a predominance of neritic phytoplankton in spring, and resuspended microphytobenthos in summer and autumn. A remarkable shift of +30/00 in d13C was reflected in both diploids and triploids from spring to summer, and further temporal differences were observed amongst their tissues. Seasonal changes in POM d15N were also reflected in oyster tissues, with digestive gland and muscle...
Tipo: Text
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2828.pdf