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Registros recuperados: 41
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Biocénose des fonds meubles du médiolittoral. Sous-région marine Mers celtiques. Evaluation initiale DCSMM. ArchiMer
Grall, Jacques; Cornubert, Ondine.
Tipo: Text Palavras-chave: Mers celtiques; Médiolittoral; Fonds meubles; Biocénoses; Habitats; Ouessant.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00328/43937/43510.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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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».
Tipo: Text
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00483/59510/62393.pdf
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Biocénoses des fonds meubles de l’infralittoral. Sous-région marine Mers celtiques. Evaluation initiale DCSMM. ArchiMer
Grall, Jacques; Cornubert, Ondine.
Tipo: Text Palavras-chave: Mers celtiques; Infralittoral; Fonds meubles; Biocénoses; Habitats.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00328/43940/43513.pdf
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Trait‐based approach to monitoring marine benthic data along 500 km of coastline ArchiMer
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
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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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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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Biocénoses des fonds durs du médiolittoral. Sous-région marine Golfe de Gascogne. Evaluation initiale DCSMM. ArchiMer
Ar Gall, Erwan; Hily, Christian; Grall, Jacques; Le Duff, Michel; Redon, Christophe; Kerninon, Fanny.
Tipo: Text Palavras-chave: Golfe de Gascogne; Biocénoses; Fonds durs; Médiolittoral.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00329/44017/43589.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.
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00026/13737/10865.pdf
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Biocénoses des fonds durs du médiolittoral. Sous-région marine Mers celtiques. Evaluation initiale DCSMM. ArchiMer
Ar Gall, Erwan; Hily, Christian; Grall, Jacques; Le Duff, Michel; Redon, Christophe; Kerninon, Fanny.
Tipo: Text Palavras-chave: Mers celtiques; Biocénoses; Fonds durs; Médiolittoral.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00328/43938/43511.pdf
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Biocénoses des fonds meubles du médiolittoral. Sous-région marine Golfe de Gascogne. Evaluation initiale DCSMM. ArchiMer
Grall, Jacques; Cornubert, Ondine.
Tipo: Text Palavras-chave: Golfe de Gascogne; Médiolittoral; Fonds meubles; Biocénoses; Habitats.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00329/44016/79137.pdf
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Small-scale effects of hydrodynamics on the structure of intertidal macroalgal communities: A novel approach ArchiMer
Burel, Thomas; Schaal, Gauthier; Grall, Jacques; Le Duff, Michel; Chapalain, Georges; Schmitt, Blondie; Gemin, Maxence; Boucher, Olivier; Ar Gall, Erwan.
Wave height was used as a proxy to assess the effect of hydrodynamics on the development and structure of intertidal North-East Atlantic rocky macroalgal communities (Brittany). The characterization of hydrodynamics at small-scale (about 10 m) was performed through wave height in situ monitoring using pressure sensors. Both the diversity and the cover of the macroalgal communities were sampled in parallel. Wave heights exhibit large variations with values ranging from ca. 5 cm to 1.60 m. We show that wave height directly controls the cover of macroalgal canopies (Pearson's r between −0.62 and −0.39). In all communities, most of the fucoid covers regressed with increasing wave height values. By contrast, positive correlations were found at low shore levels...
Tipo: Text Palavras-chave: Macroalgal communities; Intertidal zone; Rocky shores; Wave heights; Hydrodynamics; Mini-diver; Brittany.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00506/61769/65752.pdf
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Biocénoses des fonds meubles de l’infralittoral. Sous-région marine Golfe de Gascogne. Evaluation initiale DCSMM. ArchiMer
Grall, Jacques; Cornubert, Ondine.
Tipo: Text Palavras-chave: Golfe de Gascogne; Fonds meubles; Biocénoses; Infralittoral.
Ano: 2012 URL: https://archimer.ifremer.fr/doc/00329/44019/79132.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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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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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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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: https://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
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The Impossible Sustainability of the Bay of Brest? Fifty Years of Ecosystem Changes, Interdisciplinary Knowledge Construction and Key Questions at the Science-Policy-Community Interface ArchiMer
Ragueneau, Olivier; Raimonet, Melanie; Maze, Camille; Coston-guarini, Jennifer; Chauvaud, Laurent; Danto, Anatole; Grall, Jacques; Jean, Frederic; Paulet, Yves-marie; Thouzeau, Gerard.
In this contribution, the study of the Bay of Brest ecosystem changes over the past 50 years is used to explore the construction of interdisciplinary knowledge and raise key questions that now need to be tackled at the science-policy-communities interface. The Bay of Brest is subject to a combination of several aspects of global change, including excessive nutrient inputs from watersheds and the proliferation of invasive species. These perturbations strongly interact, affecting positively or negatively the ecosystem functioning, with important impacts on human activities. We first relate a cascade of events over these five decades, linking farming activities, nitrogen, and silicon biogeochemical cycles, hydrodynamics of the Bay, the proliferation of an...
Tipo: Text Palavras-chave: Sustainability; Land-ocean continuum; Bay of Brest; Interdisciplinarity; Science-policy-community interface.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00616/72792/72272.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
Registros recuperados: 41
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