WorldCat Identities

Grémare, Antoine

Overview
Works: 29 works in 33 publications in 2 languages and 52 library holdings
Roles: Thesis advisor, Other, Author, Opponent, Contributor
Publication Timeline
.
Most widely held works by Antoine Grémare
CYCLE DE VIE, REPARTITION GEOGRAPHIQUE, PRODUCTION ET NUTRITION D'UNE ESPECE ACTUELLEMENT EN EMERGENCE DANS LE GOLFE DU LION : L'ANNELIDE POLYCHETE DITRUPA ARIETINA by ESTHER JORDANA( Book )

3 editions published in 2000 in French and held by 6 WorldCat member libraries worldwide

L'OBJECTIF DE CE TRAVAIL DE THESE ETAIT DE REPONDRE AUX DEUX PRINCIPALES QUESTIONS SOULEVEES PAR L'EMERGENCE DE L'ANNELIDE POLYCHETE DITRUPA ARIETINA EN BAIE DE BANYULS-SUR-MER : LES CAUSES AYANT PRESIDE A CE PHENOMENE ET SES CONSEQUENCES POSSIBLES SUR LE FONCTIONNEMENT DES ECOSYSTEMES LITTORAUX DU GOLFE DE LION. L'APPROCHE UTILISEE POUR REPONDRE A CES QUESTIONS A CONCERNE L'ETUDE DE FACTEURS CONTROLANT L'ECOLOGIE DE CET ORGANISME ET PLUS PARTICULIEREMENT : LE CYCLE DE VIE, LA DYNAMIQUE DES POPULATIONS, LA DISTRIBUTION GEOGRAPHIQUE, LA PRODUCTION ET LA CALCIFICATION ET ENFIN, LA NUTRITION. LES RESULTATS OBTENUS SUR LE CYCLE DE VIE, LA DYNAMIQUE DE POPULATIONS (I.E., FORTEMENT INSTABLE) ET LA DISTRIBUTION GEOGRAPHIQUE A L'ECHELLE LOCALE ET A CELLE DU GOLFE DE LION (I.E., TRES HETEROGENE) ONT PERMIS DE CONFIRMER L'HYPOTHESE D'UN CHANGEMENT GRANULOMETRIQUE, COMME LA CAUSE POSSIBLE DU PROCESSUS D'EMERGENCE. LA PRODUCTION SECONDAIRE TOTALE ET LA CALCIFICATION REPRESENTENT ENVIRON 0,5% DE LA MATIERE TOTALE IMPORTEE DANS LE GOLFE DE LION. MALGRE CETTE FAIBLE CONTRIBUTION, ET DU FAIT DE LA DISTRIBUTION HETEROGENE DES POPULATIONS, ELLE DOIT CERTAINEMENT AVOIR UNE IMPORTANCE PLUS GRANDE A DES ECHELLES SPATIALES PLUS REDUITES. DES FACTEURS ENVIRONNEMENTAUX COMME LA DISPONIBILITE DE NOURRITURE ET LES CONDITIONS HYDRODYNAMIQUES AFFECTENT SIGNIFICATIVEMENT L'ACTIVITE DE FILTRATION DE DITRUPA ARIETINA. CEPENDANT, LES VARIATIONS SAISONNIERES SEMBLENT PRINCIPALEMENT RESULTER DE L'ACTION DE FACTEURS ENDOGENES (I.E., AGE ET ETAT DE MATURATION SEXUELLE). LE REGIME ALIMENTAIRE EST COMPOSE DES PARTICULES DONT LA GAMME DE TAILLE EST COMPRISE ENTRE 0,4 ET 47 M. LA FRACTION PICOPLANCTONIQUE CONTRIBUE EN MOYENNE A 23,5% DE LA BIOMASSE PHYTOPLANCTONIQUE TOTALE INGEREE. LA COMPARAISON DES PERFORMANCES DE FILTRATION DE DITRUPA ARIETINA ET DE SPISULA SUBTRUNCATA SEMBLE INDIQUER QU'IL N'EXISTE PAS DES DIFFERENCES REELLEMENT SIGNIFICATIVES ENTRE CES DEUX ESPECES
RELATIONS ENTRE LA MATIERE ORGANIQUE ET LA FAUNE BENTHIQUE DANS LE GOLFE DU LION. ASSOCIATION DE PLUSIEURS APPROCHES A DIFFERENTES ECHELLES DE TEMPS ET D'ESPACE by LAURENCE MEDERNACH( Book )

2 editions published in 2000 in French and held by 5 WorldCat member libraries worldwide

AFIN DE COMPARER LES APTITUDES DES DIFFERENTS DESCRIPTEURS BIOCHIMIQUES A DECRIRE LA QUALITE NUTRITIVE DE LA MATIERE ORGANIQUE PARTICULAIRE, CE TRAVAIL DE THESE CHERCHAIT A EVALUER LES VARIATIONS SPATIO-TEMPORELLES DE LA QUALITE DE LA MATIERE ORGANIQUE PARTICULAIRE DANS LE GOLFE DU LION AINSI QUE LES VARIATIONS DE LA FAUNE BENTHIQUE. L'ETUDE DES VARIATIONS A HAUTE FREQUENCE ET EN MILIEU COTIER DE LA QUALITE DE LA MATIERE ORGANIQUE PARTICULAIRE COMBINEE A L'ETUDE DES PHENOMENES METEOROLOGIQUES A CE SITE A PERMIS DE CONFIRMER LE ROLE MAJEUR DE LA REMISE EN SUSPENSION SOUS L'ACTION D'EVENEMENTS METEOROLOGIQUES DANS LA DYNAMIQUE DE SEDIMENTATION. LA CONSTANCE DES SPECTRES D'ACIDES AMINES DISPONIBLES (EHAA) A CONSTITUE LE PRINCIPAL RESULTAT DE CETTE ETUDE. IL SUGGERE QU'UN SIMPLE DOSAGE DE LA SOMME DES EHAA SUFFIRAIT A RENDRE COMPTE DES LIMITATIONS SUBIES PAR LA FAUNE PAR RAPPORT AUX ACIDES AMINES ESSENTIELS DISPONIBLES. LE PRINCIPAL ELEMENT RESSORTANT DE L'ETUDE A ECHELLE SAISONNIERE DE LA QUALITE DE LA MATIERE ORGANIQUE ET DE FAUNE SUIVANT UN GRADIENT COTE-LARGE A CONCERNE L'ATTENUATION DES VARIATIONS DE LA COMPOSITION BIOCHIMIQUE DE LA MATIERE ORGANIQUE PARTICULAIRE AVEC LA PROFONDEUR. LES LIPIDES ET LES ACIDES AMINES DISPONIBLES ONT ETE LES DESCRIPTEURS BIOCHIMIQUES DE LA MATIERE ORGANIQUE LES PLUS APTES A DECRIRE LES VARIATIONS DE LA FAUNE DANS LES SEDIMENTS DE VASE. L'ETUDE DE LA QUALITE DE LA MATIERE ORGANIQUE SEDIMENTAIRE ET DES CARACTERISTIQUES FAUNISTIQUES A MESOECHELLE A MONTRE UN SCHEMA DE VARIATION DE LA QUALITE DE LA MATIERE ORGANIQUE PARTICULAIRE, UNIQUE POUR TOUTE A ZONE DU GOLFE DU LION, QUI PRESENTE UNE DIMINUTION DES TENEURS EN ELEMENTS NUTRITIFS DANS LA ZONE 0-200 M ET UNE AUGMENTATION JUSQU'A DES PROFONDEURS DE 900 M. SUIVANT LES ZONES BATHYMETRIQUES CONSIDEREES LES LIPIDES ET LES EHAA SE SONT AVERES ETRE LES MEILLEURS DESCRIPTEURS DE LA VALEUR NUTRITIONNELLE DES SUBSTRATS PARTICULAIRES
Aspects quantitatifs de la reproduction chez quelques annélides polychètes : Intérets et perspectives by Antoine Grémare( Book )

1 edition published in 1988 in French and held by 5 WorldCat member libraries worldwide

ETUDE AU NIVEAU DE LA STRATEGIE, PHYSIOLOGIE ET DYNAMIQUE DES ASPECTS QUANTITATIFS DE LA REPRODUCTION CHEZ PLUSIEURS ANNELIDES POLYCHETES. L'AUTEUR FOURNIT EGALEMENT UNE DESCRIPTION DU CYCLE DE E. NEBULOSA DANS LA REGION DE BANYULS SUR MER
Utilisation de la macrofaune benthique en tant qu'indicateur des changements environnementaux : création et utilisation d'une base de données sur les côtes du Languedoc-Roussillon by Céline Labrune( Book )

2 editions published in 2006 in French and held by 4 WorldCat member libraries worldwide

Les données quantitatives concernant la macrofaune benthique des substrats meubles du littoral de la région Languedoc-Roussillon ont été centralisées et homogénéisées au sein d'une base de données relationnelle. Son utilisation a permis 1. d'étudier la distribution spatiale et la diversité des assemblages de polychètes et des communautés de la macrofaune benthique, 2. d'étudier les changements à long terme des communautés benthiques de la Baie de Banyuls-sur-Mer, et 3. de caractériser l'état écologique actuel de la zone échantillonnée. Les patrons de distribution spatiale des polychètes et de la macrofaune benthique totale sont semblables. Ils reflètent tous 2 nettement la carte sédimentologique du Golfe du Lion, montrant ainsi l'importance de la granulométrie dans la distribution de la macrofaune benthique. Différentes facettes de la diversité de ces assemblages est appréhendée à plusieurs échelles spatiales. La comparaison à long terme des communautés de la baie de Banyuls-sur-Mer montre que la fréquence des évènements de resuspension ayant lieu pendant la période de recrutement pourrait jouer un rôle important dans la détermination de la composition faunistique des communautés peu profondes, notamment dans la dynamique de population de l'annélide polychète Ditrupa arietina. La dominance de ces communautés par cette espèce complique la caractérisation du statut écologique du Golfe du Lion. En effet, selon que l'indice biotique utilisé considère Ditrupa arietina comme sensible ou tolérante aux perturbations, les résultats diffèrent grandement
Structure and diversity of shallow soft-bottom benthic macrofauna in the Gulf of Lions (NW Mediterranean) by Céline Labrune( )

1 edition published in 2008 in English and held by 2 WorldCat member libraries worldwide

Dynamics of the Upogebia pusilla-Gyge branchialis marine host-parasite system by Ludovic Pascal( )

1 edition published in 2016 in English and held by 2 WorldCat member libraries worldwide

Activity patterns in the terebellid polychaete Eupolymnia nebulosa assessed using a new image analysis system by Olivier Maire( )

1 edition published in 2006 in English and held by 2 WorldCat member libraries worldwide

Relationship between filtration activity and food availability in the Mediterranean mussel Mytilus galloprovincialis by Olivier Maire( )

1 edition published in 2007 in English and held by 2 WorldCat member libraries worldwide

Marine monitoring in Europe: is it adequate to address environmental threats and pressures? by Suzanne J Painting( )

1 edition published in 2019 in English and held by 2 WorldCat member libraries worldwide

Diversité taxinomique et fonctionnelle des habitats benthiques dans l'espace et dans le temps : une perspective régionale et décennale by Aurélien Boyé( )

1 edition published in 2018 in French and held by 1 WorldCat member library worldwide

This thesis takes advantage of long-term monitoring data covering a regional scale to better apprehend the maindrivers of the diversity of coastal seafloors. Through consideration of multiple spatial and temporal scales and different facets o fcommunity diversity, the main objective of this work was to provide a better predictive understanding of the responses of benthic communities to environmental changes. In particular, this thesis addressed the potential consequences of the on-going homogenisation of the seafloor and the global loss of biogenic habitats, havens of diversity made by foundation species. Through comparison of two such habitats, intertidal seagrass meadows and subtidal maerl beds, with bare sediment devoid of foundationspecies, this thesis has highlighted the key role of biogenicstructures for long-term maintenance of the diversity andfunctioning of benthic communities. Indeed, these habitats mediate the dynamics and responses of benthic communities to environmental conditions, ensure a greater stability of their spatial structures at regional scale, and appeared essential for the long-term maintenance of the ecological functions benthic invertebrates are associated with. This work also highlighted that foundation species may affect benthic communities through different mechanisms, and that has implications on the structure and vulnerability of these communities. Lastly, this the sisemphasized a strong spatial and temporal stability of community richness despite important underlying changes in composition and there by stressed the need to better characterise these compositional variations to guide conservation. These variations contributed, for instance, to an unexpectedly high taxonomic and functional richness of bare sediment at regional scale,similar to those of biogenic habitats, despite being locally depauperate. Overall, broad-scale monitoring programs are fundamental assets to bridge local empirical and theoretical ecological knowledge to the broader scales at which society manage and benefits from natural ecosystems
Exploration des réseaux d'interactions en écologie : de la structure vers la dynamique : signification des analyses des matrices de communauté en écologie des estuaires by Jean-Sébastien Nelva Pasqual( )

1 edition published in 2014 in French and held by 1 WorldCat member library worldwide

Le concept de réseau d'interactions est central en Écologie et différents modèles et méthodes ont été utilisés. Ce travail de thèse met en relation deux approches développées par des courants séparés : l'étude des matrices de communauté et les analyses entrée-sortie. Il confronte leurs hypothèses aux propriétés fondamentales des écosystèmes estuariens. Il précise explicitement les liens entre les différentes matrices, ainsi que la signification des mixed trophic impacts. Les matrices de la storage et de la throughflowanalyses sont reliées à des jacobiennes de modèles à compartiments dont les flux sont contrôlés par les compartiments donneurs ou receveurs. Contrairement à ce qui est le plus souvent présenté dans la littérature, l'analyse des mixed trophic impacts est ici interprétée en terme de présence-absence du compartiment considéré. Avec les données disponibles sur les réseaux trophiques de cinq estuaires européens, des matrices qualitatives et quantitatives sont construites afin de réaliser des analyses de sensibilité. Ces premières explorations montrent des niveaux d'incertitudes très élevés, et ceci même pour le signe des prédictions. Par ailleurs, ce travail de thèse approfondit les possibilités d'étude de dynamiques transitoires à partir de la matrice de communauté. Il souligne des éléments importants qu'il est nécessaire de prendre en compte lorsque ces approches sont choisies
Dynamique des populations de palourdes japonaises (Ruditapes philippinarum) dans le bassin d'Arcachon : conséquences sur la gestion des populations exploitées by Cécile Dang( )

1 edition published in 2009 in French and held by 1 WorldCat member library worldwide

The Manila clam (Ruditapes philippinarum) was introduced into Arcachon Bay at the beginning of the 1980s for aquaculture purposes. It rapidly naturalized in all intertidal flats of the lagoon. Nowadays, Arcachon Bay ranks at the first French place in terms of exploitable stock. However, recent stock assessments have shown an unbalance size structure with a deficit in juvenile and adult clams (> 38 mm shell length). These alarming patterns asked many questions on the sustainability of Manila clam populations within Arcachon Bay and have motivated the present thesis. This study aimed to better understand the population dynamics of this species and also some factors controlling this dynamic. The final objective was to improve the Manila clam fishing management with a model raised with results of the study. Von Bertalanffy growth parameters (K and L8) were both determined by a field survey of populations and by a tagged-recapture experiment during two years. Growth appeared slow with a homogeneous K within the bay and different L8 according to the sites. This study also evidenced a normal natural mortality and an inefficient reproduction (low condition index, low recruitment). Among the factors that could explain these dynamics, different pathogens were monitored during two years: digenean trematodes, brown ring disease and perkinsosis. Moreover, an emergent pathology (brown muscle disease, BMD) has been discovered. Only perkinsosis and BMD revealed high prevalences and intensities. Perkinsosis induced mitigated effects on growth whereas BMD-infected clams rise to the surface of the sediment and died. Trophic sources were also important to explain growth and were studied with carbon and nitrogen stable isotopes. This study displayed a heterogeneous repartition of Manila clam trophic sources within the bay and a phytoplankton dominated diet. The proportion of ingested phytoplankton was correlated with L8. Growth and mortality parameters were integrated in a management model. If no new management measures were taken, the clam stock will continue to decrease. Different management situations have been simulated and new measures have been adopted by administrator organisms
L'argent : sources, transfert et bioaccumulation : cas du système fluvio-estuarien girondin by Laurent Lanceleur( )

1 edition published in 2011 in French and held by 1 WorldCat member library worldwide

Silver (Ag) emissions into the environment from former mining activities and various industrial applications (e.g. jewellery, medicine, photography, electronic products and more recently nanotechnology) make Ag both a historic and an emergent pollutant for which information on its transfer and toxicity in aquatic system are scarce. This work provides a first assessment of Ag sources, transfer and bioaccumulation in the Gironde fluvial-estuarine system. The Lot-Garonne-Gironde River continuum, known for its polymetallic pollution (e.g. Cd, Zn) derived from the Decazeville basin, is a model system for studies on metal transfer from watersheds to the ocean. The relationship between historical records (~50 years) of Ag concentrations in sediment cores from the Lot River, upstream (Ag: 0.3 mg/kg) and downstream (Ag: up to 7 mg/kg) of the Decazeville basin and those of Cd constitutes evidence of a common source and transport/settlement processes due to industrial activities until 1986. High particulate Ag (AgP: 260 mg/kg) and dissolved Ag (AgD: 1,260 ng/l) concentrations in the Riou-Mort River were attributed to current leaching and erosion of slag heaps by rainwater. Those concentrations were 2 to 3 orders of magnitude greater than typical values in the Gironde watershed. However, the Riou-Mort River contribution to the Garonne River Ag fluxes (AgD: 0.008-0.041 t/a; AgP: 0.306-2.44 t/an; 1999-2009) remained low (AgP: <11%; AgD: <6%). The Garonne River provided the quasi totality (63-83%) of Ag inputs to the estuary, mainly in its particulate form (96±2%). The regional geochemical background (AgP/ThP=0.026) was useful to estimate (i) the natural contribution (20-65%) to total AgP fluxes and (ii) the anthropogenic specific fluxes of AgP (15±10 g/km²/a and 0.24±0.16 g/hab/a) in the Garonne watershed (La Réole). In the estuarine salinity, chloro-complexation desorbed ~60% of AgP, causing maximalum AgD concentrations (6-8 ng/l) at salinity 15-25 (addition to the dissolved phase). This quantity was similar to the potentially bioavailable or reactive fraction (i.e. extracted by HCl 1 M). The first estimations of net fluxes suggested that 50-80% of the Ag annual export to the coast occurred in the dissolved phase (0.64-0.89 t/a in 2008 and 0.56-0.77 t/a in 2009). Even if the ionic form Ag+ (the main form in freshwater) is considered as the most bioavailable form, Ag accumulation in estuarine organisms (oysters, shrimps and eels) reflected the higher exposition pressure in brackish water. In-situ caging of European Eels (recommended species for the biosurvey of aquatic systems; European Water Framework Directive) in key sites of the Gironde Estuary during 3 months, highlighted the direct and trophic pathways of Ag contamination at the environmental level. The historical record of Ag contamination of the Gironde Estuary oysters (1979-2007, French Mussel Watch, RNO) indicated that the Decazeville basin was a major Ag source until ~1988. However, the maximum Ag accumulation in oysters after 1993 (from ~40 to more than 100 mg/kg, dry weight) suggested an increasing contribution of additional and contemporary Ag sources like photography, cloud seeding (30-63 kg/a) or Toulouse and Bordeaux wastewater effluents (42-57 kg/a). This work is a basis for future work on Ag (including nanoparticles) cycles and related risks in aquatic systems (quantification, transfer and toxicity)
Bacterial and macrofaunal communities in the sediments of the West Gironde Mud Patch, Bay of Biscay (France)( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Abstract: Changes in (1) main sediment characteristics, and (2) benthic bacterial and macrofaunal communities were simultaneously addressed along an inner-outer transect within the West Gironde Mud Patch (Bay of Biscay, NE Atlantic), through the sampling of three stations (E: inner part, C: central part and W: outer part) during July 2010. Except in the top centimetre where a sandy layer was found at station E, all sediments were muddy and tended to be coarser and richer in photosynthetic pigments and particulate organic carbon and nitrogen at stations C and W than at station E. Maximum oxygen penetration depth was also lower at station E than at stations C and W. These results are consistent with: (1) the occurrence of strong hydrodynamics precluding current sedimentation in the inner part of the WGMP, and (2) conversely, inputs of particles originating from the Gironde Estuary in its central and outer part. Prokaryotic cell abundances were lower at station E than at stations C and W. Bacterial community composition also differed more clearly at station E as compared to stations C and W. Conversely, macrofaunal abundances and species richness decreased monotonously from station E to station W (i.e., along the inner-outer gradient). Macrofaunal composition strongly differed at station E on one side, and stations C and W on the other side. These results are consistent with the current paradigm regarding the long term effect of major rivers on benthic macrofauna given that strong hydrodynamics at station E precludes the sedimentation of fine particles originating from the Gironde Estuary. At last, we found no overall correlation between benthic bacterial and macrofaunal compositions, which may however clearly result from limitations in our sampling design
Rôle de l'espèce ingénieure Upogebia pusilla dans le fonctionnement biogéochimique des écosystèmes intertidaux à herbier (Zostera noltei) du bassin d'Arcachon by Ludovic Pascal( )

1 edition published in 2017 in French and held by 1 WorldCat member library worldwide

In Arcachon bay, the endobenthic thalassinid crustacean Upogebia pusilla is tightly associated with the intertidal dwarf grass Zostera noltei providing the sediment stability required for the construction of (semi-)permanent burrows. Because of the depth and complex architecture of their burrow (> 30 cm), this high mobile engineer species have been largely ignored in previous studies aiming at better understanding the role of macrobenthic communities in the functioning of seagrass ecosystems and the consequences of their rapid decline. This manuscript presents an integrated study regarding the role played by U. pusillain the functioning of its ecosystem, with particular emphasis on the characterisation and quantification of the relationships between (1) its different activities (burrowing, ventilating,walking...), (2) both bioturbation modes and rates and (3) their respective impacts on the sedimentary biogeochemical dynamics. This work shows that mud shrimp activity leads tohigh mixing and bioirrigation of the surrounding sediment matrix, thus strongly enhancing organic matter mineralisation processes and solute exchanges across the sediment-water interface. Although the influence of U. pusilla on ecological and biogeochemical processes largely depends on environmental conditions (e.g., seasonality and parasitism), altogether my results suggest that the gradual decline of its population in Arcachon bay, as a direct consequence of benthic habitat degradation, may greatly alter the overall functioning of this vulnerable marine ecosystem
Ecology and behaviour of bottlenose dolphins (Tursiops truncatus) in a coastal area subject to shellfish farming by Séverine Methion( )

1 edition published in 2019 in English and held by 1 WorldCat member library worldwide

Studying the ecology of cetaceans living under the pressure of anthropogenic activities is essential for their conservation. Yet, there is a paucity of information on cetaceans and shellfish farming. Using a long-term and year-round dataset, this study investigates the ecology and the behaviour of a coastal cetacean, the bottlenose dolphin (Tursiops truncatus), in an important area for shellfish farming (Ría de Arousa, North-West Spain). A resident population of bottlenose dolphins was present year-round in this area. Their seasonal abundance varied from 56 to 144 individuals and their apparent survival was high. Of the investigated environmental factors, depth and shellfish farms were influencing dolphins habitat use, and chlorophyll-a and dissolved oxygen were influencing their spatio-temporal aggregation patterns. Foraging behaviour was mainly determined by the sea surface temperature, time of the day, and whether the dolphins were foraging within shellfish farm areas. Dolphins were predicted to be more likely found foraging inside these areas than outside (57% vs. 43%). Findings of this study also revealed variation in foraging behaviour among dolphins, with some individuals foraging more frequently than others within the shellfish farms. In turn, individuals that frequently foraged within shellfish farms had weaker associations compared to others. This study generates key insights into the ecology and the behaviour of a coastal cetacean living under the pressure of the shellfish farming industry. It further provides valuable information on conservation priorities for coastal cetaceans living under such pressures as well as regulations for the shellfish farming industry
Spatial heterogeneity of benthic biogeochemistry in two contrasted marine environments (Arcachon Bay and Bay of Biscay, SW France)( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Abstract: We have studied the heterogeneity of vertical profiles of biogeochemical components obtained from sediment core slicing. Sediment cores were collected in the intertidal zone of the Arcachon Bay and on the continental slope of the Bay of Biscay, at 550 and 1000m depth. At each station of the Arcachon Bay, five 1m-side zones were delimited at low tide. In each square, 3 cores were collected. Spatial heterogeneity on the continental slope was obtained from the study of 3 cores of multi-corer while 2 or 3 multi-corer deployments were used during the same oceanographic cruise. Similarity between profiles was determined to estimate the spatial heterogeneity at different scales. In the Arcachon Bay, results showed a spatial heterogeneity at a decimetre scale on apparently homogeneous areas. Despite the spatial variability, all the replicated profiles in Arcachon Bay sediments had similar trends, suggesting homogeneous benthic properties. However, a sampling with replicate cores handling is required for seasonal monitoring or study of biogeochemical mechanisms in coastal environments. We observe that the spatial variability on the continental margin of the Bay of Biscay is lower than in coastal environment of the Arcachon Bay. Heterogeneity is equivalent at a decimetre scale and at a hundred meters scale, which is the precision of the sampling positioning due to the drift of the boat and the tilt of the corer cable. In addition, our 10-year-long database for the Bay of Biscay showed that differences in the shape of profiles obtained in sediment cores collected at the same stations throughout this long period may not be interpreted in terms of evolution with time, because the observed variability is as high as the spatial heterogeneity
 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.94 (from 0.75 for Etude des ... to 0.97 for CYCLE DE V ...)

Languages
French (16)

English (8)