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A new species of Anna (Mollusca: Neogastropoda: Buccinidae) from Brazil Rev. Bras. Zool.
Coltro,José; Dornellas,Ana Paula S..
Anna capixaba, a new species found in depths of 45-60 m off the coast of the state of Espírito Santo, southeastern Brazil, is herein described. The new species is mainly characterized by a teleoconch of 4.5 whorls, weakly demarcated from the protoconch; sculptured by rounded, prominent, narrowly-separated, spiral threads; outer lip with 5-6 teeth, posterior tooth stronger; columella with two plicae, smooth.
Tipo: Info:eu-repo/semantics/article Palavras-chave: Continental shelf; New species; Taxonomy; Western Atlantic.
Ano: 2013 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-46702013000100012
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Analysis of salinity measurements near islands on the French continental shelf of the Bay of Biscay ArchiMer
Lazure, Pascal; Jegou, Anne-marie; Kerdreux, Michel.
The Bay of Biscay is characterised by large fresh water inputs from two major rivers, the Loire and the Gironde, with a mean discharge of about 900 m(3)/s. To describe the spatial and temporal variability of the Loire and Gironde plumes, continuous salinity measurements were made at 4 locations on French coastal islands over periods lasting at least two years. These islands are located at a distance from the large local gradients linked to local inputs. Whereas sea surface salinity in the centre of the Bay of Biscay is 35.6, salinities at the coast vary between about 35 in summer to occasionally less than 30 in late winter or in spring. Minimum salinities do not occur at the same time along the coast, indicating a strong spatial gradient. Near the Loire...
Tipo: Text Palavras-chave: Bay of Biscay; Continental shelf; River plume; Seasonal variability; Salinity; Hydrology.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/publication-3957.pdf
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Atlas Hydrologique des eaux superficielles du plateau continental mauritanien OceanDocs
Dobrovine, B.; Mahfoudh, M.; Ould Dedah, S..
Ce volume du Bulletin Scientifique est entièrement consacré à l'atlas hydrologique des eaux superficielles du plateau continental mauritanien
Tipo: Journal Contribution Palavras-chave: Eaux de surface; Interannual variability; Amplitude saisonnière; Waters surface; Evolution saisonnière; Ecarts de température; Moyenne mensuelle; Moyenne saisonnière; Continental shelf; Mauritanie; Températures; Variations in temperature; Temperatures; Plateu continental; Mean seasonal range of temperature; Variabilité interannuelle; Mean Annual temperatures; Mauritania; Seasonal evolution; Températures moyennes annuelles; Oceanographic atlases; Hydrology.
Ano: 1990 URL: http://hdl.handle.net/1834/766
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Bathymétrie du secteur atlantique du banc Porcupine (ouest de l'Irlande) au cap Finisterre (Espagne) ArchiMer
Brenot, Roger; Berthois, Leopold.
Tipo: Text Palavras-chave: Fishing; Bay of Biscay; Geomorphology; Continental shelf; Mapping; Bathymetry.
Ano: 1962 URL: http://archimer.ifremer.fr/doc/1962/publication-2100.pdf
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Circulation and water mass transports on the East Antarctic shelf in the Mertz Glacier region ArchiMer
Martin, Antoine; Houssais, Marie-noelle; Le Goff, Herve; Marec, Claudie; Dausse, Denis.
The East Antarctic shelf off Adélie-George V Land is known to be an important region for Dense Shelf Water (DSW) formation as a result of intense sea ice production in the Mertz Glacier Polynya during the winter season. It is also a region where the warm modified Circumpolar Deep Water (mCDW) penetrates onto the shelf during the summer. Using hydrographic observations from a summer survey in 2008 we implement a box inverse model to propose a comprehensive view of the steady state circulation on this shelf in summer. Additional information from mooring observations collected on the depression slope is used to provide context to the retrieved circulation scheme. Over the depression slope, the summer baroclinic structure of the currents is found to contrast...
Tipo: Text Palavras-chave: Antarctica; Continental shelf; Modified Circumpolar Deep Water; Heat transport; Freshwater transport; Adelie Georges V Land.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00386/49766/50302.pdf
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Diversity and composition of macrobenthic community associated with sandy shoals of the Louisiana continental shelf ArchiMer
Dubois, Stanislas; Gelpi, Carey; Condrey, Richard E.; Grippo, Mark A.; Fleeger, John W..
Along the Louisiana, USA continental shelf, sandy shoals are shallow, possibly oxygen-rich "islands" surrounded by deeper muddy deposits prone to hypoxia. Shoals also contain significant quantities of fine sand that may be mined in the future for coastal restoration. The ecological role of shoals remains poorly understood and we hypothesized that shoals provide critical habitat for benthic invertebrates. Using Ship Shoal as a model system, we assessed the diversity and structure of macrobenthic assemblages and how community structure varies with season and environmental parameters. High biomass (averaging 26.7 g m(-2)) and high diversity (161 species) of macrobenthos was found in 2006. Polychaetes (45%-72 species) and crustaceans comprised most of the...
Tipo: Text Palavras-chave: Shallow habitat; Sand bank; Louisiana; Hypoxia refuge; Gulf of Mexico; Continental shelf; Biodiversity hotspot.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/publication-6975.pdf
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Ecological model of the Bay of Biscay and English Channel shelf for Environmental Status assessment Part 1: Nutrients, phytoplankton and oxygen ArchiMer
Menesguen, Alain; Dussauze, Morgan; Dumas, Franck; Thouvenin, Benedicte; Garnier, Valerie; Lecornu, Fabrice; Repecaud, Michel.
European directives (Water Framework Directive - WFD and Marine Strategy Framework Directive - MSFD) require a regular survey of several descriptors of the Environmental Status of coastal waters of the North-east Atlantic Ocean. Especially for the MSFD, which may concern large continental shelf areas where measurements are scarce, realistic ecological models can help assessing the Environmental Status. The ECO-MARS3D model of the pelagic ecosystem of the Bay of Biscay and English Channel continental shelf (NE Atlantic) has been developed for these applied purposes and validated against various types of historic data. This first paper deals with the basic biogeochemical version, which contains inorganic nutrients (NH4, NO3, PO4, Si(OH)4), three...
Tipo: Text Palavras-chave: Ecological 3D model; Continental shelf; Bay of Biscay and English Channel; Surface chlorophyll; Dissolved oxygen; MSFD.
Ano: 2019 URL: https://archimer.ifremer.fr/doc/00469/58098/60510.pdf
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Etude biometrique et remarques concernant la population de Raja clavata Linne, 1758 du plateau continental casablancais (Maroc atlantique) ArchiMer
Aloncle, Henri.
During the hypotremata (l) study undertaken while we were in Morocco (1959-1967), we happened upon large batches of Raja clavata Linné, 1758. The abundance of the material thus made available to us prompted us to study a little more closely this species that is very widely dominant between -150 and -200m on the Casablanca continental shelf.
Tipo: Text Palavras-chave: Casablanca; Continental shelf; Raja clavata; Biometry; Accroissement; Maroc atlantique; Hypotremata; Raja clavata; Etude biometrique.
Ano: 1980 URL: http://archimer.ifremer.fr/doc/1980/publication-1942.pdf
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FIRST RECORD OF BRITTLE-STAR SCHIZOSTELLA BIFURCATA (ECHINODERMATA: OPHIUROIDEA) IN THE COLOMBIAN CARIBBEAN Boletín de Investigaciones
Manrique-Rodríguez,Nelson; Borrero-Pérez,Giomar H..
ABSTRACT This paper reports Schizostella bifurcata, a member of the family Gorgonocephalidae for the first time in the Colombian Caribbean. This report is based on specimens collected from the continental shelf of Santa Marta bay, where the species was found associated with gorgonians.
Tipo: Journal article Palavras-chave: Ophiuroids; Taxonomy; First record; Continental shelf; Colombian Caribbean.
Ano: 2017 URL: http://www.scielo.org.co/scielo.php?script=sci_arttext&pid=S0122-97612017000100205
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Impact of an intrusion by the Northern Current on the biogeochemistry in the eastern Gulf of Lion, NW Mediterranean ArchiMer
Ross, Oliver N.; Fraysse, Marion; Pinazo, Christel; Pairaud, Ivane.
We present the results from the RHOMA2011-LEG2 campaign that took place in the eastern Gulf of Lion from 7 to 17 Oct 2011 and combine them with remote sensing observations and results from a 3D coupled hydrodynamic-biogeochemical model to study an intrusion event of the Northern Current (NC) onto the continental shelf in the Gulf of Lion (NW Mediterranean). Our analysis shows that during the intrusion, the previously upwelled nutrient-rich water present on the shelf is replaced by warmer and mostly oligotrophic NC water within a matter of 2–3 days. This has a marked impact on the local biogeochemistry in the Gulf with pre-intrusion Chl-a concentrations in the surface layer of over 0.5 mg m−3 dropping to near the detection limit within less than 72 h. The...
Tipo: Text Palavras-chave: Northern Current; Gulf of Lion; Intrusion; Continental shelf; Biogeochemical modelling; Regime shift.
Ano: 2016 URL: http://archimer.ifremer.fr/doc/00302/41359/40644.pdf
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Importations et remaniements de thanatofaunes dans les sables de la plate-forme profonde des approches occidentales de la Manche ArchiMer
Reynaud, Jean-yves; Lauriat-rage, Agnès; Tessier, Bernadette; Neraudeau, Didier; Braccini, Eric; Carriol, René-pierre; Clet-pellerin, Martine; Moullade, Michel; Lericolais, Gilles.
Macro- and micro-faunas are reported from six gravity cores collected at a mean depth of 150 m in the surficial deposits of the Kaiser sand bank in the Southern Western Channel Approaches. These are bivalves (mainly), gastropods, echinids, crustaceans and foraminifers. These fauna present a very rich association of numerous, well preserved species from various ecological settings. Such an association is commonly reported from the continental shelf of the last transgressive cycle. In addition, the sediment comprises two imported faunal associations. The first one corresponds to thanatocaenoses of Pliocene/lowermost Pleistocene and Weichselian age, reworked respectively from the underlying celtic incised valley fills and the Celtic Sand Banks. The absence of...
Tipo: Text Palavras-chave: Continental shelf; Thanatofauna; Sea level; Reworking; Transport.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00146/25682/23843.pdf
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Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco) ArchiMer
Lafosse, M.; Gorini, C.; Le Roy, P.; Alonso, B.; D'Acremont, E.; Ercilla, G.; Rabineau, Marina; Vazquez, J. T.; Rabaute, A.; Ammar, A..
In active basins, tectonics can segment the continental shelf and control its stratigraphic architecture and physiography. Segmentation can explain the local evolution and morphology of the continental shelf because of sea-level variations, local tectonic segmentation and hydrodynamic processes. Here we investigate the tectonically active Morocco continental margin (southern Alboran Sea) using high-resolution seismic profiles and multibeam bathymetric data. The active faults bounding the transtensive Nekor basin triggered the segmentation of the shelf into three sectors showing different subsidence rates: a western sector corresponding to an extensive fault relay, a central sector corresponding to the subsiding Al-Hoceima Bay and an eastern sector...
Tipo: Text Palavras-chave: Seismic stratigraphy; Active tectonic; Pleistocene; Continental shelf; Swath bathymetry; Geomorphology; Western Mediterranean.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00451/56232/57812.pdf
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Nature and rates of fine-sedimentation on a mid-shelf: "La Grande Vasiere" (Bay of Biscay, France) ArchiMer
Dubrulle, C; Jouanneau, J; Lesueur, P; Bourillet, Jean-francois; Weber, O.
The study area, "La Grande Vasiere" (LGV), stretches out on the French Atlantic continental shelf (at ca. 100 m water depth), along 250 km from the Glenan Islands at the north to the southwest of Rochebonne at the south. Box-cores were sampled in this mid-shelf area during four cruises in June 1995, and in April, June and September 2002. They were investigated using sedimentologicat approaches (X-radiographs and grain-size analyses) and radionuclide studies (Pb-210 geochronology and excess Th-234). The main results are: (1) the surficial sediments are generally organized into a decimetrescale fining up sequence which can be the result of extreme storms; (2) an upper mixing layer of 7-20cm reflects an important biological benthic activity and/or the impact...
Tipo: Text Palavras-chave: Bay of Biscay; Continental shelf; Sedimentation rate; Radionuclides; Fine sediment fraction; Mud.
Ano: 2007 URL: http://archimer.ifremer.fr/doc/2007/publication-3539.pdf
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Observations ichtyologiques de la faune mésopélagique du talus continental du Golfe de Gascogne en 2003 ArchiMer
Quero, Jean-claude; Spitz, J.
During the trawls for exploration of mesopelagic fauna led in 2003, we note for the first time in the Bay of Biscay, the presence of the race Pseudoscopelus and Cynogadus brachicolus of which only seven specimens had been known. We also inform of the catch of one Rhadinesthes decimus and two Electrona risso above the continental shelf of the Bay. NOT CONTROLLED OCR
Tipo: Text Palavras-chave: Electrona risso; Rhadinesthes decimus; Cynogadus brachycolus; Pseudoscopelus sp; Continental shelf; Bay of Biscay; First record; Electrona risso; Rhadinesthes decimus; Cynogadus brachycolus; Pseudoscopelus sp; Talus continental; Golfe de Gascogne; Premier signalement.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/publication-3654.pdf
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Palaeomagnetic and rock magnetic analysis of Holocene deposits from the Adriatic Sea: detecting and dating short-term fluctuations in sediment supply ArchiMer
Vigliotti, L; Verosub, K; Cattaneo, Antonio; Trincardi, F; Asioli, A; Piva, A.
We present palaeomagnetic and rock magnetic results from five cores collected in the basin of the Adriatic Sea. Four cores (PRAD2-4; KS02-246; CSS00-23 and CSS00-07) were collected along a shore-parallel transect whereas the fifth core (AMC99-01) was retrieved in the central Adriatic in 250 m water depth, on the floor of the Meso-Adriatic Depression. After alternating field demagnetization, the natural remanent magnetization (NRM) directions show a characteristic and primary magnetization of the sediments that is representative of secular variation of the geomagnetic field. By combining C-14 dating and the ages of magnetic inclination features, it has been possible to establish an age-depth model for all of the cores. Precise identification of the secular...
Tipo: Text Palavras-chave: Holocene; Adriatic Sea; Mediterranean; Sediment cores; Continental shelf; Secular variations; Palaeomagnetism.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4208.pdf
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Refroidissements locaux aux abords du talus continental Armoricain ArchiMer
Langlois, Gilbert; Gohin, Francis; Serpette, Alain.
Infrared measurement at the sea surface, which constitutes an operational technology in remote-sensing, has become essential for the study of ocean dynamics. Nevertheless, observations are only usable when clouds do not mask infrared radiation coming from the ocean, a condition which rarely pertains in the Bay of Biscay as a whole. lt is consequently a matter of primary concern to have at one's disposai an effective method which permits the computation of mean SST fields from a chronological succession of incomplete images. In the case under consideration, "kriging" is the most widely practised method of performing geostatistical estimates. Before mapping isotherms, temperatures are estimated by interpolation on a regular gridnet. The process was applied...
Tipo: Text Palavras-chave: Ondes internes; Talus continental; Température superficielle; Télédétection; Analyse objective; Internal waves; Continental shelf; Sea-surface temperature; Teledetection; Objective analysis.
Ano: 1990 URL: http://archimer.ifremer.fr/doc/00131/24236/22229.pdf
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Relação dos peixes coletados nos limites da plataforma continental e nas montanhas submarinas Vitória, Trindade e Martin Vaz, durante a campanha oceanográfica MD-55 Brasil Zoologia
Andreata,José V.; Séret,Bernard.
The result of an agreement between Universidade Santa Ursula, Rio de Janeiro and the Museum of Natural History of Paris, was the oceanographic campaign MD-55 Brasil which took place between May 6th and June 2nd of 1987, aboard the R/V "Marion Dufresne" of the Terres Australes et Antartique Françaises (TAAF). Samples were collected between latitudes 23º36'40"S and 18º49'S. Ichthyofauna sampled was relatively low, and comprised of just one family of Chondrichthyes (three species) and 50 families of Osteichthyes (104 species). Zenion hololepsis (Goode & Bean, 1895) (Zeniodontidae) is recorded for the first time from the western South Atlantic, as well as is extended the geographic limits for Myrophis frio Jordan & Davis. 1892 (Ophichthidae)...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Fish species list; South Atlantic; Continental shelf.
Ano: 1995 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-81751995000300014
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Répartition des foraminifères benthiques actuels sur le plateau continental sénégalais au sud de Dakar ArchiMer
Redois, F; Debenay, Jp.
Two hundred and twenty four benthic foraminiferal species were recognized in the total assemblages of fifty samples collected from the Senegalese continental shelf south of Dakar (down to a depth of 200 m). A factor analysis based on nineteen dominant species shows three main factors. The first two seem to be associated with temperature and its seasonal variations; they are depth-related and determine two main faunal changes. The third factor is substrate-related. The main depth-related species are: i) Cribrononion gerthi, Quinqueloculina akneriana, Quinqueloculina lamarckiana, Cribrolinoides curtus, Elphidium fichtellianum and Textularia sagittula in th coastal zone; ii) Discorbinella bertheloti, Cancris aff. C. sagrum, Textularia truncata, Nonion fabum,...
Tipo: Text Palavras-chave: Foraminifère actuel; Plateau continental; Atlantique; Sénégal; Recent foraminifer; Continental shelf; Atlantic; Senegal.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43622/43920.pdf
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Response of the Rhone deltaic margin to loading and subsidence during the last climatic cycle ArchiMer
Jouet, Gwenael; Hutton, E; Syvitski, J; Berne, Serge.
Passive continental margin subsidence is initiated by the synrift mechanical stretching of the lithospheric upper brittle layer and continues during the postrift phase; the thermal cooling and contraction of the upwelled asthenosphere forces the margin to subside in addition to the overloads from sea water and sediments. Therefore, the total subsidence in stretched basins includes fault-controlled initial sinking, thermal subsidence and flexural isostatic compensations. Decoupling and estimating the different components of this subsidence from stratigraphic analysis and restricted geophysical and sedimentological databases remains problematic. In particular, backstripping the sediment layers requires a well-constrained geological framework. A method is...
Tipo: Text Palavras-chave: Gulf of Lions; Continental shelf; Sedflux; Stratigraphic simulations; Isostasy; Subsidence.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-4640.pdf
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Seasonal variation of riverine nutrient inputs in the northern Bay of Biscay (France), and patterns of marine phytoplankton response ArchiMer
Guillaud, Jean-francois; Aminot, Alain; Delmas, Daniel; Gohin, Francis; Lunven, Michel; Labry, Claire; Herbland, Alain.
Seasonal variations in nutrient inputs are described for the main rivers (Loire and Vilaine) flowing into the northern Bay of Biscay. The river plumes are high in N/P ratio in late winter and spring, but not in the inner plume during the summer. Conservative behavior results in most nutrients entering the estuary and eventually reaching the coastal zone. Temporal and spatial aspects of phytoplankton growth and nutrient uptake in the northern Bay of Biscay distinguish the central area of salinity 34 from the plume area. The first diatom bloom appears offshore in late winter, at the edge of the river plumes, taking advantage of haline stratification and anticyclonic "weather windows." In spring, when the central area of the northern shelf is...
Tipo: Text Palavras-chave: Northern Bay of Biscay; Phytoplankton; Continental shelf; Riverine inputs; Nutrients.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2007/publication-2354.pdf
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