Consulta: creatorFacets:"Gauthier, Olivier"
Registros recuperados: 13
Data/hora: 09/06/2024 07:41:43

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

Habitat heterogeneity influences cold-seep macrofaunal communities within and among seeps along the Norwegian margin. Part 1: macrofaunal community structure
Provedor de dados: 5
Autores: Decker, Carole; Morineaux, Marie; Van Gaever, Saskia; Caprais, Jean-claude; Lichtschlag, Anna; Gauthier, Olivier; Andersen, Ann C.; Olu, Karine.
Håkon Mosby mud volcano (HMMV) is one of the most active and most studied seep sites in European waters. Many authors have described its thermal activity, dynamic of mud flows, and geochemical and microbial processes. It is characterised by a concentric zonation of successive biogenic habitats related to an activity and geochemical gradient from its centre to its periphery. Around the central area covered by mud flows, white and grey microbial mats occur among areas of bare sediment, whereas siboglinid tubeworm fields of Sclerolinum contortum and/or Oligobrachia haakonmosbiensis colonise the peripheral areas. The meiofaunal community is known to be structured among habitats, but the macrofauna has rarely been investigated and has never been sampled in...
Tipo: Text
Palavras-chave: Cold-seep; Community structure; Macrofauna; Norwegian margin; Polychaeta.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00074/18517/16130.pdf

Seep communities from two mud volcanoes in the deep eastern Mediterranean Sea: faunal composition, spatial patterns and environmental control
Provedor de dados: 5
Autores: Ritt, Benedicte; Desbruyeres, Daniel; Caprais, Jean-claude; Gauthier, Olivier; Ruffine, Livio; Buscail, Roselyne; Olu-le Roy, Karine; Sarrazin, Jozee.
The Mediterranean Sea constitutes a unique environment to study cold-seep ecosystems due to the presence of different geodynamic settings, from an active margin along the Mediterranean Ridge (MR) to a passive margin in the Nile Deep-Sea Fan (NDSF). We attempted to identify the structure of benthic communities associated with the Napoli and Amsterdam mud volcanoes (MVs) located on the MR and to establish the links between faunal distribution and environmental conditions at different spatial scales. Comparison between the 2 MVs revealed that the faunal distribution seemed to be mainly controlled by the characteristics of the microhabitats. On both geological structures, the variability between the different microhabitats was higher than the variability...
Tipo: Text
Palavras-chave: Mediterranean Ridge; Cold seeps; Benthic fauna; Environmental conditions; Diversity indices; Microhabitats.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00106/21725/19292.pdf

First insights into the structure and environmental setting of cold-seep communities in the Marmara Sea
Provedor de dados: 5
Autores: Ritt, Benedicte; Sarrazin, Jozee; Caprais, Jean-claude; Noel, Philippe; Gauthier, Olivier; Pierre, Catherine; Henry, Pierre; Desbruyeres, Daniel.
A brackish-water cold seep on the North Anatolian Fault (NAF) in the Marmara Sea was investigated with the Nautile submersible during the MarNaut cruise in 2007. This active zone has already been surveyed and revealed evidence of active seeping on the seafloor, such as bubble emissions, patches of reduced sediments, microbial mats and authigenic carbonate crusts. MarNaut was the first opportunity to sample benthic communities in the three most common microhabitats (bioturbated and reduced sediments, carbonate crust) and to examine their relationships with environmental conditions. To do so, faunal communities were sampled and chemical measurements were taken close to the organisms. According to diversity indices, the bioturbated microhabitat exhibited the...
Tipo: Text
Palavras-chave: Marmara Sea; Cold seep; Benthic fauna; Biological diversity; Environmental conditions; Chemosynthetic.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00014/12506/9528.pdf

Diversity and distribution of cold-seep fauna associated with different geological and environmental settings at mud volcanoes and pockmarks of the Nile Deep-Sea Fan
Provedor de dados: 5
Autores: Ritt, Benedicte; Pierre, Catherine; Gauthier, Olivier; Wenzhoefer, Frank; Boetius, Antje; Sarrazin, Jozee.
The Nile Deep-Sea Fan (NDSF) is located on the passive continental margin off Egypt and is characterized by the occurrence of active fluid seepage such as brine lakes, pockmarks and mud volcanoes. This study characterizes the structure of faunal assemblages of such active seepage systems of the NDSF. Benthic communities associated with reduced, sulphidic microhabitats such as sediments and carbonate crusts were sampled by remotely operated vehicles during two cruises in 2006 (BIONIL) and 2007 (MEDECO). Environmental conditions and biological factors including family-level faunal composition, density and diversity were measured at local and regional scales. Significant differences were detected at different spatial scales: (1) the fauna of reduced habitats...
Tipo: Text
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00037/14798/12212.pdf

Immune responses of phenoloxidase and superoxide dismutase in the manila clam Venerupis philippinarum challenged with Vibrio tapetis – Part I: Spatio-temporal evolution of enzymes’ activities post-infection
Provedor de dados: 5
Autores: Le Bris, Cedric; Richard, Gaelle; Paillard, Christine; Lambert, Christophe; Seguineau, Catherine; Gauthier, Olivier; Pernet, Fabrice; Guerard, Fabienne.
Manila clams, Venerupis philippinarum (Adams and Reeve, 1850), were experimentally challenged with two Vibrio tapetis strains: CECT4600T, the causative agent of Brown Ring Disease (BRD); and LP2 supposedly non-pathogenic in V. philippinarum. Changes in phenoloxidase (PO) and superoxide dismutase (SOD), two major enzymes involved in immunity, were studied in two tissues, the mantle and hemolymph for 30 days after infection in the extrapallial cavity. Bacterial infection in V. philippinarum resulted in modulation of PO and SOD activities that was both tissue- and time-dependent. A response at early times was detected in the mantle and was associated with significant increases in PO and SOD activities in LP2- and CECT4600T-challenged clams 36h post injection....
Tipo: Text
Palavras-chave: Venerupis philippinarum; Vibrio tapetis; Immunity; Phenoloxidase; Superoxide dismutase.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00221/33257/31733.pdf

Are spatial variations in the diets of hydrothermal fauna linked to local environmental conditions?
Provedor de dados: 5
Autores: De Busserolles, F.; Sarrazin, Jozee; Gauthier, Olivier; Gelinas, Y.; Fabri, Marie-claire; Sarradin, Pierre-marie; Desbruyeres, Daniel.
Trophic relationships in Bathymodiolus azoricus mussel bed communities on the Tour Eiffel hydrothermal edifice (Lucky Strike) were assessed using delta C-13 and delta N-15 signatures from 14 hydrothermal species. The nutritional basis of B. azoricus was also investigated with delta S-34. Faunal samples and environmental data (temperature, pH, total dissolved sulfide, iron and copper concentrations) were collected from 12 different locations on the edifice. Chemical conditions varied between microhabitats, and were all correlated to temperature. Carbon and nitrogen isotopic results revealed the presence of two, apparently independent, trophic groups. The first was composed of symbiont-bearing fauna (B. azoricus and their associated polychaetes...
Tipo: Text
Palavras-chave: Lucky Strike (37 degrees 17.29 ' N 32 degrees 16.45 ' W); Mid Atlantic Ridge; Food webs; Hydrothermal springs; Environmental conditions; Stable isotopes.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7312.pdf

Evaluation de la sensibilité des habitats élémentaires (DHFF) d’Atlantique, de Manche et de Mer du Nord aux pressions physiques
Provedor de dados: 5
Autores: La Riviere, Marie; Aish, Annabelle; Auby, Isabelle; Ar Gall, Erwan; Dauvin, Jean-claude; De Bettignies, Thibaut; Derrien-courtel, Sandrine; Dubois, Stanislas; Gauthier, Olivier; Grall, Jacques; Janson, Anne Laure; Thiebaut, Eric.
Le Ministère de l’Environnement de l’Energie et de la Mer a confié au Service du Patrimoine Naturel (Muséum National d’Histoire Naturelle), en lien étroit avec les acteurs de la recherche scientifique, la coordination d’un projet sur l’évaluation de la sensibilité des habitats benthiques aux pressions d’origine anthropique. L’objectif de ce travail est de qualifier la sensibilité générique des habitats présents en France métropolitaine pour aider à l’orientation et à la priorisation de mesures de gestion (pour des activités actuelles ou futures), adaptées aux enjeux de conservation, afin de respecter les objectifs d’atteinte ou de maintien d’un ECF (DCSMM) ou BEE (DHFF). Ce travail permet également de mettre en évidence les habitats et/ou les pressions...
Tipo: Text
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00376/48699/49033.pdf

Effects of macroalgal accumulations on the variability in zoobenthos of high-energy macrotidal sandy beaches
Provedor de dados: 5
Autores: Quillien, Nolwenn; Nordstrom, Marie C.; Gauthier, Olivier; Bonsdorff, Erik; Paulet, Yves-marie; Grall, Jacques.
Sandy beaches, forming the most widespread coastal habitat in the world, are threatened by the effects of increasing anthropogenic pressure in the context of global change, including the increased occurrence of green tides composed of free-living Ulva spp. Sandy beaches are also highly dynamic ecosystems that support numerous essential ecological functions and contain a distinctive biodiversity, but their precise functioning and natural variability (i.e. the disentangling of biological and physical influences) remain under-studied. Our study aimed at determining the effects of space, time, and environmental variables on the natural variability of macrofaunal community structure and at specifically determining the effects of macroalgal accumulations on the...
Tipo: Text
Palavras-chave: Macrotidal sandy beach; Macrofauna; Green tides; Space-time analysis; Beta-diversity.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00260/37078/73131.pdf

Trait‐based approach to monitoring marine benthic data along 500 km of coastline
Provedor de dados: 5
Autores: Boyé, Aurelien; Thiébaut, Éric; Grall, Jacques; Legendre, Pierre; Broudin, Caroline; Houbin, Céline; Le Garrec, Vincent; Maguer, Marion; Droual, Gabin; Gauthier, Olivier.
Aim β diversity and its linkages with ecosystem functioning remain poorly documented. This impedes our capacity to predict biodiversity changes and how they affect ecosystem functioning at scales relevant for conservation. Here, we address the functional implications of ongoing seafloor changes by characterizing at regional scale the taxonomic and functional α and β diversities of benthic habitats currently threatened by biotic homogenization. Location Western Europe. Methods Combining a trait‐based approach to benthic community monitoring data covering a 7‐year period and 500 km of coast, we explored the mechanisms governing community assembly in habitats associated with two types of foundation species, intertidal seagrass and subtidal maerl beds,...
Tipo: Text
Palavras-chave: Beta diversity; Biotic homogenization; Broad-scale monitoring; Community assembly; Coralline algae; Ecosystem engineers; Functional diversity; Zostera marina.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00515/62688/67074.pdf

Measure and mis-measure of species diversity in deep-sea chemosynthetic communities
Provedor de dados: 5
Autores: Gauthier, Olivier; Sarrazin, Jozee; Desbruyeres, Daniel.
Our knowledge of species diversity in deep-sea chemosynthetic communities has come a long way since their discovery in the late 1970s, However, their study poses serious challenges that are linked to their remoteness, the variable selectivity and effectiveness of sampling tools in different conditions, a lack of consensus on the size compartments and sieve size used in practice, and the persistent discovery of species that are previously unknown to science. Still, with increasing accessibility and new sampling tools, quantitative data are becoming both more frequent and extensive, reducing limitations in the estimation and comparison of species diversity. Here, we review the literature for common difficulties encountered in the measurement and comparison...
Tipo: Text
Palavras-chave: Deep-sea ecosystems; Chemosynthetic community; Species diversity; Richness; Evenness; Rarefaction; Diversity profiles; Diversity ordering; Alpha diversity; Statistical analysis.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00001/11274/7842.pdf

Functional trait‐based approaches as a common framework for aquatic ecologists
Provedor de dados: 5
Autores: Martini, Séverine; Larras, Floriane; Boye, Aurelien; Faure, Emile; Aberle, Nicole; Archambault, Philippe; Bacouillard, Lise; Beisner, Beatrix E; Bittner, Lucie; Castella, Emmanuel; Danger, Michael; Gauthier, Olivier; Karp‐boss, Lee; Lombard, Fabien; Maps, Frédéric; Stemmann, Lars; Thiébaut, Eric; Usseglio‐polatera, Philippe; Vogt, Meike; Laviale, Martin; Ayata, Sakina‐dorothée.
Aquatic ecologists face challenges in identifying the general rules of the functioning of ecosystems. A common framework, including freshwater, marine, benthic, and pelagic ecologists, is needed to bridge communication gaps and foster knowledge sharing. This framework should transcend local specificities and taxonomy in order to provide a common ground and shareable tools to address common scientific challenges. Here, we advocate the use of functional trait‐based approaches (FTBAs) for aquatic ecologists and propose concrete paths to go forward. Firstly, we propose to unify existing definitions in FTBAs to adopt a common language. Secondly, we list the numerous databases referencing functional traits for aquatic organisms. Thirdly, we present a synthesis...
Tipo: Text
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00663/77504/79245.pdf

The marine intertidal zone shapes oyster and clam digestive bacterial microbiota
Provedor de dados: 5
Autores: Offret, Clement; Paulino, Sauvann; Gauthier, Olivier; Château, Kevin; Bidault, Adeline; Corporeau, Charlotte; Miner, Philippe; Petton, Bruno; Pernet, Fabrice; Fabioux, Caroline; Paillard, Christine; Blay, Gwenaelle Le.
Digestive microbiota provides a wide range of beneficial effects on host physiology and are therefore likely to play a key role in marine intertidal bivalve ability to acclimatize to the intertidal zone. This study investigated the effect of intertidal levels on the digestive bacterial microbiota of oysters Crassostrea gigas and clams Ruditapes philippinarum, two bivalves with different ecological niches. Based on the 16S rRNA region sequencing, digestive glands, seawater and sediments harbored specific bacterial communities, dominated by OTUs assigned to the Mycoplasmatales, Desulfobacterales and Rhodobacterales orders, respectively. Field implantation modified digestive bacterial microbiota of both bivalve species according to their intertidal position....
Tipo: Text
Palavras-chave: Microbiota; Oysters; Clams; Intertidal zone; Digestive gland; Metabarcoding.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00628/73961/73320.pdf