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Registros recuperados: 23
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Coastal waters freshening and extreme seasonality affect organic matter sources, quality, and transfers in a High Arctic fjord (Young Sound, Greenland) ArchiMer
Bridier, Guillaume; Meziane, Tarik; Grall, Jacques; Chauvaud, Laurent; Sejr, Mikael Kristian; Menneteau, Sylvain; Olivier, Frederic.
Arctic benthic ecosystems are expected to experience strong modifications in the dynamics of primary producers and/or benthic-pelagic coupling under climate change. However, lack of knowledge about the influence of physical constraints (e.g. ice-melting associated gradients) on organic matter sources, quality, and transfers in systems such as fjords can impede predictions of the evolution of benthic-pelagic coupling in response to global warming. Here, sources and quality of particulate organic matter (POM) and sedimentary organic matter (SOM) were characterized along an inner-outer gradient in a High Artic fjord (Young Sound, NE Greenland) exposed to extreme seasonal and physical constraints (ice-melting associated gradients). The influence of the...
Tipo: Text Palavras-chave: Arctic ecosystems; Benthic-pelagic coupling; Organic matter; Climate change; Fatty acids; Stable isotopes; Young Sound.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00492/60318/67180.pdf
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Combined effects of global climate change and nutrient enrichment on the physiology of three temperate maerl species ArchiMer
Qui-minet, Zujaila Nohemy; Coudret, Jérôme; Davoult, Dominique; Grall, Jacques; Mendez‐sandin, Miguel; Cariou, Thierry; Martin, Sophie.
Made up of calcareous coralline algae, maerl beds play a major role as ecosystem engineers in coastal areas throughout the world. They undergo strong anthropogenic pressures, which may threaten their survival. The aim of this study was to gain insight into the future of maerl beds in the context of global and local changes. We examined the effects of rising temperatures (+3°C) and ocean acidification (−0.3 pH units) according to temperature and pH projections (i.e., the RCP 8.5 scenario), and nutrient (N and P) availability on three temperate maerl species (Lithothamnion corallioides, Phymatolithon calcareum, and Lithophyllum incrustans) in the laboratory in winter and summer conditions. Physiological rates of primary production, respiration, and...
Tipo: Text Palavras-chave: Calcification; Maerl; Nitrate; Ocean acidification; Ocean warming; Phosphate; Photosynthesis; Respiration.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00595/70722/68955.pdf
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Comparative study of isotopic trends in two coastal ecosystems of North Biscay: A multitrophic spatial gradient approach ArchiMer
Mortillaro, J. M.; Schaal, G.; Grall, Jacques; Nerot, C.; Brind'Amour, Anik; Marchais, V.; Perdriau, M.; Le Bris, H..
In coastal estuarine embayments, retention of water masses due to coastal topography may result in an increased contribution of continental organic matter in food webs. However, in megatidal embayments, the effect of topography can be counterbalanced by the process of tidal mixing. Large amounts of continental organic matter are exported each year by rivers to the oceans. The fate of terrestrial organic matter in food webs of coastal areas and on neighboring coastal benthic communities was therefore evaluated, at multi-trophic levels, from primary producers to primary consumers and predators. Two coastal areas of the French Atlantic coast, differing in the contributions from their watershed, tidal range and aperture degree, were compared using carbon and...
Tipo: Text Palavras-chave: Bay of Brest; Bay of Vilaine; Benthic; Filter-feeders; Stable isotopes; Organic matter.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00167/27847/26203.pdf
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DCE en Manche-Atlantique : Essais inter-laboratoires sur les mesures d’abondance des zostères (Zostera marina et Zostera noltei). Validation de protocoles et recommandations ArchiMer
Auby, Isabelle; Oger-jeanneret, Helene; Rigouin, Loic; Rollet, Claire; Trut, Gilles; Grall, Jacques; Maguer, Marion; Guigues, Nathalie; Lalere, Béatrice.
Ce rapport a été réalisé dans le cadre du programme scientifique et technique AQUAREF pour les années 2016- 2018, au titre de l’action « B » « Mettre en oeuvre les méthodes de bioindication dans la surveillance et l’évaluation».
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Ano: 2018 URL: https://archimer.ifremer.fr/doc/00483/59510/62393.pdf
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Easier detection of invertebrate "identification-key characters" with light of different wavelengths ArchiMer
Koken, Marcel; Grall, Jacques.
The marine alpha-taxonomist often encounters two problems. Firstly, the "environmental dirt" that is frequently present on the specimens and secondly the difficulty in distinguishing key-features due to the uniform colours which fixed animals often adopt. Here we show that illuminating animals with deep-blue or ultraviolet light instead of the normal white-light abrogates both difficulties; dirt disappears and important details become clearly visible. This light regime has also two other advantages. It allows easy detection of very small, normally invisible, animals (0.1 mu m range). And as these light wavelengths can induce fluorescence, new identification markers may be discovered by this approach.
Tipo: Text Palavras-chave: Fluorescent colours; Light emission; Determination; Cryptic species; Dimorphism; Pattern UV light; Deep-blue light; Autofluorescence.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00185/29660/28026.pdf
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Environmental factors affecting maerl bed structure in Brittany (France) ArchiMer
Dutertre, Mickael; Grall, Jacques; Ehrhold, Axel; Hamon, Dominique.
This study used a large spatial scale approach in order to better quantify the relationships between maerl bed structure and a selection of potentially forcing physical factors. Data on maerl bed structure and morpho-sedimentary characteristics were obtained from recent oceanographic surveys using underwater video recording and grab sampling. Considering the difficulties in carrying out real-time monitoring of highly variable hydrodynamic and physicochemical factors, these were generated by three-dimensional numerical models with high spatial and temporal resolution. The BIOENV procedure indicated that variation in the percentage cover of thalli can best be explained (correlation = 0.76) by a combination of annual mean salinity, annual mean nitrate...
Tipo: Text Palavras-chave: Benthic habitats; Brittany; Environmental factors; Estuary; Large spatial scale; Maerl.
Ano: 2015 URL: https://archimer.ifremer.fr/doc/00280/39089/37816.pdf
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Evaluation de la sensibilité des habitats élémentaires (DHFF) d’Atlantique, de Manche et de Mer du Nord aux pressions physiques ArchiMer
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...
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Ano: 2017 URL: http://archimer.ifremer.fr/doc/00376/48699/49033.pdf
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First and repeated records of the tropical-temperate crab Asthenognathus atlanticus Monod, 1932 (Decapoda: Brachyura) in the eastern part of the Bay of Seine (eastern English Channel, France) ArchiMer
Jourde, Jerome; Alizier, Sandrine; Dancie, Chloe; Dauvin, Jean-claude; Desroy, Nicolas; Dubut, Severine; Gentil, Franck; Grall, Jacques; Hanin, Camille; Lanshere, Julien; Thiebaut, Eric.
Asthenognathus atlanticus Monod, 1932, has been reported for the first time from the eastern part of the Bay of Seine (eastern English Channel). A total of 30 specimens were collected between the years 2008 and 2011, along the Normandy coast from Ouistreham to Antifer, mainly on mud and muddy sand habitats, between 10 and 25 m depth. The distribution range of A. atlanticus has been previously known to cover eastern Atlantic coasts from Angola to the western English Channel, where it reached its northern limits. It is also present in the western part of the Mediterranean Sea. The changes in the sediment composition of the eastern Bay of Seine have probably led to the development of a potentially favorable habitat for this species. However, the data...
Tipo: Text Palavras-chave: Crustacea Decapoda; Asthenognathus atlanticus; Bay of Seine; Geographical extension; Eastern English Channel.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00131/24178/22365.pdf
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Heterogeneous energetic pathways and carbon sources on deep eastern Mediterranean cold seep communities ArchiMer
Carlier, Antoine; Ritt, Benedicte; Rodrigues, Clara F.; Sarrazin, Jozee; Olu, Karine; Grall, Jacques; Clavier, Jacques.
Cold seep communities in the Mediterranean Sea have only been discovered two decades ago, and their trophic ecology has been the subject of very few studies. We investigated the benthic food web of two deep chemosynthesis-based ecosystems on the Napoli and Amsterdam mud volcanoes (MVs) in the eastern Mediterranean Sea (similar to 2,000 m depth). Seeping methane has been detected at the surface of both MVs during pioneering cruises and has been hypothesised to be assimilated by benthic fauna as observed in other oceans' margins. Given the extreme oligotrophic character of the eastern Mediterranean Sea, we a priori expected that chemosynthetic food sources, especially methane-derived carbon (MDC), played a major trophic role in these deep seep communities...
Tipo: Text Palavras-chave: Gulf of Mexico; Anaerobic methane oxidation; Stable isotope analysis; Sea hydrothermal vents; Food web structure; Kazan mud volcano; Florida escarpment; Trophic relationships; Benthic communauties; Lamellibrachia SP.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00016/12684/9633.pdf
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Identification des post-larves de deux Calyptraeidae Calyptraea chinensis et Crepidula fornicata ArchiMer
Jezequel, Youenn; Carlier, Antoine; Grall, Jacques.
This study presents four morphological criteria based on the shell, determined under a stereomicroscope, allowing the identification of the Calyptraeidae’s post larvae in Calyptraea chinensis and Crepidula fornicata from a 0.7mm size. The septum shape in C. chinensis is spiraled while in C. fornicata it is perpendicular to the longitudinal axis of the shell (beginning of the lodge’s formation), which constitutes the most reliable criterion when trying to discriminate between the species. C. chinensis shells coloration appears homogeneous and concentric whereas colored spots are observed on C. fornicata shells. Calyptraea chinensis shell shape is circular while Crepidula fornicata shell shape is oval. Lastly the apex appears centered in C. chinensis and...
Tipo: Text Palavras-chave: Calyptraea chinensis; Crepidula fornicata; Post-larve; Critères morphologiques; Calyptraea chinensis; Crepidula fornicata; Post larva; Morphological criteria.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00523/63535/67199.pdf
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Les fonds marins de Bretagne, un patrimoine remarquable : connaître pour mieux agir ArchiMer
Bajjouk, Touria; Duchene, Julie; Guillaumont, Brigitte; Maud, Bernard; Blanchard, Michel; Derrien-courtel, Sandrine; Dubois, Stanislas; Grall, Jacques; Hamon, Dominique; Hily, Christian; Le Gal, Aodren; Rigolet, Carine; Rossi, Nadège; Ledard, Michel.
Depuis la fin des années 90, les besoins de connaissance et de suivi de la biodiversité marine se sont accrus sensiblement. Les attentes sont motivées par la nécessité de mieux évaluer aussi bien l’impact du changement climatique que celui des activités anthropiques. Fortement convoitées, la faune et la flore benthiques sont en effet soumises à de multiples perturbations générées par les activités humaines, soit physiquement (effets de la pêche aux engins traînants, extractions de granulats, conchyliculture, etc.), soit résultant de pollutions chroniques (rejets urbains, industriels et agricoles) ou d’apports accidentels (pollutions pétrolières, introduction d'espèces exogènes). Il s’agit également de contribuer aux mesures de gestion ou de protection des...
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Ano: 2015 URL: http://archimer.ifremer.fr/doc/00311/42243/41811.pdf
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Liste des espèces marines introduites dans les eaux bretonnes et des espèces introduites envahissantes des eaux périphériques ArchiMer
Blanchard, Michel; Goulletquer, Philippe; Hamon, Dominique; Le Mao, Patrick; Nezan, Elizabeth; Gentil, Franck; Simon, Nathalie; Viard, Frédérique; Ar Gall, Erwan; Grall, Jacques; Hily, Christian; Le Duff, Michel; Stiger-pouvreau, Valérie; Acou, Anthony; Derrien-courtel, Sandrine; Feunteun, Eric; D'Hondt, Jean-loup; Canard, Alain; Ysnel, Frédéric; Perrin, Bertrand.
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Ano: 2010 URL: http://archimer.ifremer.fr/doc/00026/13737/10865.pdf
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Loimia ramzega sp nov., a new giant species of Terebellidae (Polychaeta) from French waters (Brittany, English Channel) ArchiMer
Lavesque, Nicolas; Bonifacio, Paulo; Londono-mesa, Mario H.; Le Garrec, Vincent; Grall, Jacques.
A new species of Terebellidae, Loimia ramzega sp. nov., has been identified from North Brittany beaches (English Channel). This new species is characterized by its gigantic size (max 650 mm, live), two pairs of lateral lappets on segments 1 and 3; first pair more ventral, second pair more developed and lateral but oblique, with wavy edge. Nine ventral pads from segment 2 (fused on segments 2 and 3), first three pads swollen, next ones subsequently decreasing in size. Three types of notochaetae, asymmetrically bilimbate, symmetrically bilimbate and capillary. Uncini pectinate with 6 teeth (some with 5 teeth) slightly decreasing in size, in one vertical row. Pygidium with about 14 long conical marginal papillae surrounding anus.
Tipo: Text Palavras-chave: Terebellinae; Morphology; Molecular; Taxonomy; DNA COI 16S; North-east Atlantic; France.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00431/54224/55764.pdf
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Metabarcoding is powerful yet still blind: a comparative analysis of morphological and molecular surveys of seagrass communities ArchiMer
Cowart, Dominique A.; Pinheiro, Miguel; Mouchel, Olivier; Maguer, Marion; Grall, Jacques; Mine, Jacques; Arnaud-haond, Sophie.
In the context of the sixth wave of extinction, reliable surveys of biodiversity are increasingly needed to infer the cause and consequences of species and community declines, identify early warning indicators of tipping points, and provide reliable impact assessments before engaging in activities with potential environmental hazards. DNA metabarcoding has emerged as having potential to provide speedy assessment of community structure from environmental samples. Here we tested the reliability of metabarcoding by comparing morphological and molecular inventories of invertebrate communities associated with sea-grasses through estimates of alpha and beta diversity, as well as the identification of the most abundant taxa. Sediment samples were collected from...
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Ano: 2015 URL: https://archimer.ifremer.fr/doc/00255/36596/35164.pdf
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Multiscale patterns in the diversity and organization of benthic intertidal fauna among French Atlantic estuaries ArchiMer
Blanchet, Hugues; Gouillieux, Benoit; Alizier, Sandrine; Amouroux, Jean-michel; Bachelet, Guy; Barille, Anne-laure; Dauvin, Jean-claude; De Montaudouin, Xavier; Derolez, Valerie; Desroy, Nicolas; Grall, Jacques; Gremare, Antoine; Hacquebart, Pascal; Jourde, Jerome; Labrune, Celine; Lavesque, Nicolas; Meirland, Alain; Nebout, Thiebaut; Olivier, Frederic; Pelaprat, Corine; Ruellet, Thierry; Sauriau, Pierre-guy; Thorin, Sebastien.
Based on a parallel sampling conducted during autumn 2008, a comparative study of the intertidal benthic macrofauna among 10 estuarine systems located along the Channel and Atlantic coasts of France was performed in order to assess the level of fauna similarity among these sites and to identify possible environmental factors involved in the observed pattern at both large (among sites) and smaller (benthic assemblages) scales. More precisely this study focused on unraveling the observed pattern of intertidal benthic fauna composition and diversity observed at among-sites scale by exploring both biotic and abiotic factors acting at the among- and within-site scales. Results showed limited level of similarity at the among-site level in terms of intertidal...
Tipo: Text Palavras-chave: Estuaries; Macrozoobenthos; Diversity; Structuring Factors; WFD.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00179/29016/27444.pdf
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On the presence of the rissoid gastropod Alvania lamellata Dautzenberg, 1889 on the top of the azorean Condor seamount (206 m depth) ArchiMer
Le Duff, Michel; Bongiorni, Lucia; Zeppilli, Daniela; Grall, Jacques.
This note reports the presence of the rissoid gastropod Alvania lamellata Dautzenberg, 1889 on the top of the Condor seamount (Azores) at 206 m depth. This allows reconsideration of the ecology of the species which lives in the deep circalittoral rather than in the bathyal zone.
Tipo: Text Palavras-chave: Rissoidae; Alvania lamellata; Açores; Mont sous-marin; Étage; Rissoidae; Alvania lamellata; Azores; Seamount; Habitat.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00199/31051/29471.pdf
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Protocoles de suivi stationnel des herbiers à zostères pour la Directive Cadre sur l’Eau (DCE). Zostera marina - Zostera noltei. Version 3 ArchiMer
Auby, Isabelle; Oger-jeanneret, Helene; Gouillieux, Benoît; Grall, Jacques; Janson, Anne-laure; Maguer, Marion; Rigouin, Loic; Rollet, Claire; Sauriau, Pierre - Guy; Trut, Gilles.
This report is an update of the previous WFD monitoring protocols for seagrass beds on the French coasts (Channel, Atlantic). The different steps of field sampling and laboratory measurements are described.
Tipo: Text Palavras-chave: Directive Cadre sur l’eau; Herbiers; Zostera noltei; Zostera marina; Protocoles de suivi; Water Framework Directive; Seagrass beds; Zostera noltei; Zostera marina; Monitoring protocols..
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00471/58250/60782.pdf
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Regional and latitudinal patterns of soft-bottom macrobenthic invertebrates along French coasts: Results from the RESOMAR database ArchiMer
Gallon, Regis K.; Lavesque, Nicolas; Grall, Jacques; Labrune, Celine; Gremare, Antoine; Bachelet, Guy; Blanchet, Hugues; Bonifacio, Paulo; Bouchet, Vincent M. P.; Dauvin, Jean-claude; Desroy, Nicolas; Gentil, Franck; Guerin, Laurent; Houbin, Celine; Jourde, Jerome; Laurand, Sandrine; Le Duff, Michel; Le Garrec, Vincent; De Montaudouin, Xavier; Olivier, Frederic; Orvain, Francis; Sauriau, Pierre-guy; Thiebaut, Eric; Gauthier, Olivier.
This study aims to describe the patterns of soft bottom macrozoobenthic richness along French coasts. It is based on a collaborative database developed by the “Réseau des Stations et Observatoires Marins” (RESOMAR). We investigated patterns of species richness in sublittoral soft bottom habitats (EUNIS level 3) at two different spatial scales: 1) seaboards: English Channel, Bay of Biscay and Mediterranean Sea and 2) 0.5° latitudinal and longitudinal grid. Total observed richness, rarefaction curves and three incidence-based richness estimators (Chao2, ICE and Jacknife1) were used to compare soft bottom habitats species richness in each seaboard. Overall, the Mediterranean Sea has the highest richness and despite higher sampling effort, the English Channel...
Tipo: Text Palavras-chave: Zoobenthos; Species richness; Regional pattern; Latitudinal pattern; Soft-bottom; France.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00376/48769/49166.pdf
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Stable isotope ratios in bentho-demersal biota along a depth gradient in the bay of biscay: A multitrophic study ArchiMer
Schaal, Gauthier; Nerot, Caroline; Grall, Jacques; Chouvelon, Tiphaine; Lorrain, Anne; Mortillaro, Jean-michel; Savoye, Nicolas; Brind'Amour, Anik; Paulet, Yves-marie; Le Bris, Herve.
Although stable isotope ratios are increasingly used to investigate the trophic ecology of marine organisms, their spatial variations are still poorly understood in the coastal environment. In this study, we measured the stable isotope composition (δ13C, δ15N) of suspended particulate organic matter (SPOM) (primary producer), a suspension feeder, the great scallop Pecten maximus (primary consumer), megabenthic decapods and benthic fishes (secondary consumers) along a depth gradient (from 5m to 155m depth) across the continental shelf of the Bay of Biscay. Although the three trophic levels exhibited similar δ13C patterns along the gradient, the δ15N patterns varied between SPOM, scallops and carnivores. The δ15N difference between SPOM and scallops...
Tipo: Text Palavras-chave: Trophic; Coastal; Bivalves; Food web; Bay of Biscay.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00288/39921/38481.pdf
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The spread goes on: the non-indigenous species Grandidierella japonica Stephensen, 1938 (Amphipoda: Aoridae) has reached Brittany (Gulf of Morbihan) ArchiMer
Droual, Gabin; Le Garrec, Vincent; Cabelguen, Jérôme; Gélinaud, Guillaume; Grall, Jacques.
For the first time in Brittany, the aorid amphipod Grandidierella japonica Stephensen, 1938 is reported in the Noyalo River (Gulf of Morbihan). The finding of ovigerous females suggests a well-established, self-sustaining population. Similarly to other European localities, we hypothesise that the shellfish farming industry is the main vector of introduction.
Tipo: Text Palavras-chave: Grandidierella japonica; Conchyliculture; Espèce non-indigène; Bretagne; Grandidierella japonica; Shellfish farming; Non-indigenous species; Brittany.
Ano: 2017 URL: https://archimer.ifremer.fr/doc/00512/62414/66683.pdf
Registros recuperados: 23
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