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Registros recuperados: 10
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Are deep-sea ecosystems surrounding Madagascar threatened by land-use or climate change? ArchiMer
Fontanier, Christophe; Mamo, Briony; Toucanne, Samuel; Bayon, Germain; Schmidt, Sabine; Deflandre, Bruno; Dennielou, Bernard; Jouet, Gwenael; Garnier, Eline; Sakai, Saburo; Lamas, Ruth Martinez; Duros, Pauline; Toyofuku, Takashi; Sale, Aurelien; Belleney, Deborah; Bichon, Sabrina; Boissier, Audrey; Cheron, Sandrine; Pitel, Mathilde; Roubi, Angelique; Rovere, Mickael; Gremare, Antoine; Dupre, Stephanie; Jorry, Stephan.
In this short communication, we present a multidisciplinaty study of sedimentary records collected from a deep-sea interfluve proximal to the mouths of major northwestern Madagascan rivers. For the last 60 years, the seafloor has been repeatedly disturbed by the deposition of organic rich, tropical, terrestrial sediments causing marked reductions in benthic biodiversity. Increased soil erosion due to local land-use, deforestation and intensifying tropical cyclones are potential causes for this sedimentary budget and biodiversity shift. Our marine sedimentary records indicate that until now, these conditions have not occurred within the region for at least 20,000 years.
Tipo: Text Palavras-chave: Multidisciplinary study; Benthic foraminifera; Land-use; Tropical cyclones.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00413/52488/53276.pdf
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Benthic foraminifera from the deep-water Niger delta (gulf of Guinea): Assessing present-day and past activity of hydrate pockmarks ArchiMer
Fontanier, Christophe; Koho, K. A.; Goni-urriza, M. S.; Deflandre, Bruno; Galaup, S.; Ivanovsky, A.; Gayet, Nicolas; Dennielou, Bernard; Gremare, Antoine; Bichon, S.; Gassie, C.; Anschutz, P.; Duran, R.; Reichart, G. J..
We present ecological and isotopic (δ18O and δ13C) data on benthic foraminifera sampled from 4 deep-sea stations in a pockmark field from the deep-water Niger delta (Gulf of Guinea, Equatorial Atlantic Ocean). In addition, a series of sedimentological and (bio)geochemical data are shown to back up foraminiferal observations. All stations are located within 1.2 km of each other, so prevailing oceanographic conditions can be assumed to be similar at each site. Two of the sites (GMMC-01 and GMMC-02) are located in a pockmark (named “pockmark A”) where current methane seepages were recorded by ROV observations. A third station (GMMC-03) is located in the topographic depression interpreted as a collapsed pockmark (named “pockmark B”). The fourth site (GMMC-04)...
Tipo: Text Palavras-chave: Niger delta; Hydrate pockmark; Foraminifera; Stable isotopes; Bacteria.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00211/32194/30628.pdf
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Etude des relations entre le phytoplancton et les phénomènes de toxicité d’origine inconnue dans le Bassin d'Arcachon ArchiMer
Maurer, Daniele; Bec, Beatrice; Neaud-masson, Nadine; Rumebe, Myriam; Auby, Isabelle; Gremare, Antoine.
Since the introduction of the oyster Crassostrea gigas in the Arcachon Basin, the sale of oysters has been banned for the first time in 2005, based on mouse bioassay positive for lipophilic toxins. If the beginning of this episode could be related to the presence in water of microalgae of the genus Dinophysis and okadaic acid in the hepatopancreas of oyster, it has not been the same for the end of the period, which was qualified as of "atypical toxicity episode" or "toxicity of unknown origin", that is to say, "an episode of shellfish contamination, revealed in a toxic response in mice by intraperitoneal injection , whose origin can not be explained by the presence of known toxins usually sought”. Between 1993 and 2009, 7 episodes Dinophysis or okadaic...
Tipo: Text
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00031/14245/11526.pdf
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Experimental study of filtration activity in Ditrupa arietina (Annelida Polychaeta) using an automated image analysis system ArchiMer
Duchene, Jean Claude; Jordana, Esther; Charles, François; Gremare, Antoine; Amouroux, Jean Michel.
An automated image analysis system designed to assess the activity of benthic organisms is described. This system is used to study filtration in the serpulid polychaete Ditrupa arietina. The video sensor of the system is composed of a black and white charged coupled device, a microprocessor, a memory and an interface board. It is driven by real-time routines, which are downloaded in permanent memory prior to each experiment. These routines control picture acquisition frequency and compute the differences in grey levels between the image recorded at a given time and a reference image (corresponding to no filtration in the case of D. arietina). These differences are used to detect numerical objects, which are stored in the memory board. At the end of each...
Tipo: Text Palavras-chave: Polychètes; Analyse d'images; Activité; Filtration; Polychaetes; Image analysis; Activity; Filtration.
Ano: 2000 URL: http://archimer.ifremer.fr/doc/00323/43377/42834.pdf
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Is benthic food web structure related to diversity of marine macrobenthic communities? ArchiMer
Sokolowski, Adam; Wolowicz, M.; Asmus, H.; Asmus, R.; Carlier, Antoine; Gasiunaite, Z.; Gremare, Antoine; Hummel, H.; Lesutiene, J.; Razinkovas, A.; Renaud, Paul; Richard, P.; Kedra, M..
Numerical structure and the organisation of food webs within macrozoobenthic communities has been assessed in the European waters (Svalbard, Barents Sea, Baltic Sea, North Sea, Atlantic Ocean and the Mediterranean Sea) to address the interactions between biodiversity and ecosystem functioning. Abundance and classical species diversity indices (S, H', J) of macrofaunal communities were related to principal attributes of food webs (relative trophic level and food chain length, FCL) that were determined from carbon and nitrogen stable isotope values. Structure of marine macrobenthos varies substantially at a geographical scale; total abundance ranges from 63 ind. m(-2) to 34,517 ind. m(-2), species richness varies from 3 to 166 and the Shannon-Weaver...
Tipo: Text Palavras-chave: Macrobenthic communities; Biodiversity; Food web structure; Diversity-structure interactions; European waters.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00093/20378/18214.pdf
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JERICO-NEXT. JRAP Synthesis and contribution to the strategy for the future ArchiMer
Gremare, Antoine; Puillat, Ingrid; Karlson, Bengt; Artigas, Felipe; Nizzetto, Luca; Rubio, Anna; Laakso, Lauri; Mourre, Baptiste.
Six Joined Research activity Projects (JRAPS have been achieved within JERICO-NEXT. These projects have been set up to tackle some of the complex technical and scientifical issues associated with the implementation of Coastal Ocean Observing over a wide range of environmental conditions and spatiotemporal scales. The topics of these projects have been defined in relation with some of the Marine Strategy Framework Directive: JRAP 1: Biodiversity of plankton, harmful algal blooms and eutrophication, JRAP 2: Monitoring changes in microbenthic biodiversity, assessing potential environmental controls and functional consequences JRAP 3: Occurrence of contaminants in Northern coastal waters and biological responses JRAP 4: 4D characterization of trans-boundary...
Tipo: Text
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00577/68871/67242.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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Origin and composition of sediment organic matter in a coastal semi-enclosed ecosystem: An elemental and isotopic study at the ecosystem space scale ArchiMer
Dubois, S.; Savoye, N.; Gremare, Antoine; Plus, Martin; Charlier, K.; Beltoise, A.; Blanchet, Hugues.
The origin and composition of sediment organic matter (SOM) were investigated together with its spatial distribution in the Arcachon Bay - a macrotidal lagoon that shelters the largest Zostera noltii meadow in Europe - using elemental and isotopic ratios. Subtidal and intertidal sediments and primary producers were both sampled in April 2009. Their elemental and isotopic compositions were assessed. Relative contributions of each source to SOM were estimated using a mixing model. The SOM composition tended to be homogeneous over the whole ecosystem and reflected the high diversity of primary producers in this system. On average, SOM was composed of 25% of decayed phanerogams, 19% of microphytobenthos, 20% of phytoplankton, 19% of river SPOM and 17% of...
Tipo: Text Palavras-chave: Sediment organic matter; Primary producers; C and N stable isotopes; Zostera noltii; Arcachon Bay.
Ano: 2012 URL: http://archimer.ifremer.fr/doc/00073/18426/16059.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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Unexpected biotic resilience on the Japanese seafloor caused by the 2011 Tohoku-Oki tsunami ArchiMer
Toyofuku, Takashi; Duros, Pauline; Fontanier, Christophe; Mamo, Briony; Bichon, Sabrina; Buscail, Roselyne; Chabaud, Gerard; Deflandre, Bruno; Goubet, Sarah; Gremare, Antoine; Menniti, Christophe; Fujii, Minami; Kawamura, Kiichiro; Koho, Karoliina Annika; Noda, Atsushi; Namegaya, Yuichi; Oguri, Kazumasa; Radakovitch, Olivier; Murayama, Masafumi; De Nooijer, Lennart Jan; Kurasawa, Atushi; Ohkawara, Nina; Okutani, Takashi; Sakaguchi, Arito; Jorissen, Frans; Reichart, Gert-jan; Kitazato, Hiroshi.
On March 11th, 2011 the Mw 9.0 2011 Tohoku-Oki earthquake resulted in a tsunami which caused major devastation in coastal areas. Along the Japanese NE coast, tsunami waves reached maximum run-ups of 40 m, and travelled kilometers inland. Whereas devastation was clearly visible on land, underwater impact is much more difficult to assess. Here, we report unexpected results obtained during a research cruise targeting the seafloor off Shimokita (NE Japan), shortly (five months) after the disaster. The geography of the studied area is characterized by smooth coastline and a gradually descending shelf slope. Although high-energy tsunami waves caused major sediment reworking in shallow-water environments, investigated shelf ecosystems were characterized by...
Tipo: Text Palavras-chave: Palaeoceanography; Biodiversity.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00248/35914/34453.pdf
Registros recuperados: 10
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