Consulta: subjectFacets:"Continental shelf"
Registros recuperados: 27
Data/hora: 11/06/2024 11:21:25

Wind induced upwellings in the gulf of lions
Provedor de dados: 5
Autores: Millot, Claude.
Continental shelf dynamics have been observed since 1974 in the Gulf of Lions (NorthWestern Mediterranean Sea), with the principal aim of understanding the sumrner circulation in this region. From satellite infrared data, current meters, thermistor chains, and tidal gauge records, it appears that the major events occurring on the continental shelf take the form of wind-induced mesoscale phenomena. These phenomena, which are connected with strong and transient coastal upwellings, are generated by NorthWesterly winds, the mistral and the tramontane, which are highly transient in speed, with a stable direction and a short lifetime. These specifie features have enabled us to investigate the transient response of the sea on about ten such occasions per typical...
Tipo: Text
Palavras-chave: Upwelling côtier; Plateau continental; Golfe du Lion; Coastal upwelling; Continental shelf; Gulf of Lions.
Ano: 1979
URL: http://archimer.ifremer.fr/doc/00122/23335/21159.pdf

Etude biometrique et remarques concernant la population de Raja clavata Linne, 1758 du plateau continental casablancais (Maroc atlantique)
Provedor de dados: 5
Autores: 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

Response of the Rhone deltaic margin to loading and subsidence during the last climatic cycle
Provedor de dados: 5
Autores: 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

Bottom trawling contribution to the spatio-temporal variability of sediment fluxes on the continental shelf of the Bay of Biscay (France)
Provedor de dados: 5
Autores: Mengual, Baptiste; Le Hir, Pierre; Cayocca, Florence; Garlan, T.
Based on experiments, a trawling-induced erosion dynamics was included in a 3D realistic and pre-validated hydro-sedimentary model so as to assess its contribution to the overall regional sediment dynamics in the specific case of the Bay of Biscay continental shelf. The effect of trawling was investigated throughout a 5-year period in terms of horizontal/vertical fluxes and changes in seabed mud content, and compared to the natural variability of sediment fluxes at different spatio-temporal scales. Trawling is shown in the model to significantly contribute to sediment re-suspension, and changes in the seabed at the scale of the shelf. The contribution of trawling to re-suspension is &gt;80% during the high fishing season at many locations on the outer...
Tipo: Text
Palavras-chave: Sediment fluxes; Bottom trawling; Numerical modelling; Bay of Biscay; Continental shelf.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00500/61146/64574.pdf

Spatial variability in oxygen and nutrient fluxes at the sediment-water interface on the continental shelf in the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Denis, L; Grenz, C.
The spatial variability of oxygen and dissolved nutrient exchanges across the sediment-water interface was studied on the continental shelf in the Gulf of Lions (NW Mediterranean Sea). Replicate sediment cores were sampled at nine stations (64-162 m depth) along two lines parallel to the coast during two cruises in March and June 1998. Sediment-water exchanges were measured using the core incubation technique. Surficial sediments, bottom water and interstitial water characteristics were also described. Fluxes of oxygen (3.72-8.83 mmol m(-2) d(-1)), nitrate (0.026-0.283 mmol m(-2) d(-1)), ammonium (-0.022 to 0.204 mmol m(-2) d(-1)), nitrite (-0.034 to 0.002 mmol m(-2) d(-1)), phosphate (-0.007 to 0.029 mmol m(-2) d(-1)) and silicate (0.504-1.656 mmol m(-2)...
Tipo: Text
Palavras-chave: Flux à l’interface eau-sédiment; Sels nutritifs; Minéralisation; Méditerranée nord-occidentale; Plateau continental; Sediment-water fluxes; Nutrients; Mineralization processes; NW Mediterranean; Continental shelf.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43263/42994.pdf

Refroidissements locaux aux abords du talus continental Armoricain
Provedor de dados: 5
Autores: 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

Répartition des foraminifères benthiques actuels sur le plateau continental sénégalais au sud de Dakar
Provedor de dados: 5
Autores: 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

Analysis of salinity measurements near islands on the French continental shelf of the Bay of Biscay
Provedor de dados: 5
Autores: 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

Ecological model of the Bay of Biscay and English Channel shelf for Environmental Status assessment Part 1: Nutrients, phytoplankton and oxygen
Provedor de dados: 5
Autores: 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

Circulation and water mass transports on the East Antarctic shelf in the Mertz Glacier region
Provedor de dados: 5
Autores: 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

Integrated assessment of the spatial distribution and structural dynamics of deep benthic marine communities
Provedor de dados: 5
Autores: Jansen, Jan; Dunstan, Piers K.; Hill, Nicole A.; Koubbi, Philippe; Melbourne‐thomas, Jessica; Causse, Romain; Johnson, Craig R.
Characterising the spatial distribution and variation of species communities and validating these characteristics with data from the field are key elements for an ecosystem‐based approach to management. However, models of species distributions that yield community structure are usually not linked to models of community dynamics, constraining understanding and management of the ecosystem, particularly in data‐poor regions. Here we use a qualitative network model to predict changes in Antarctic benthic community structure between major marine habitats characterised largely by seafloor depth and slope, and use multivariate mixture models of species distributions to validate the community dynamics. Further, we then assess how future increases in primary...
Tipo: Text
Palavras-chave: Deep‐sea; Ecosystem structure; Ecosystem dynamic; Southern Ocean; Antarctica; Continental shelf; Upper slope; Species archetype model; Qualitative network model; Spatial model.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00599/71143/69460.pdf

Late Pleistocene-Holocene history of a tectonically active segment of the continental margin (Nekor basin, Western Mediterranean, Morocco)
Provedor de dados: 5
Autores: 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

Nature and rates of fine-sedimentation on a mid-shelf: "La Grande Vasiere" (Bay of Biscay, France)
Provedor de dados: 5
Autores: 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

Observations ichtyologiques de la faune mésopélagique du talus continental du Golfe de Gascogne en 2003
Provedor de dados: 5
Autores: 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

Impact of an intrusion by the Northern Current on the biogeochemistry in the eastern Gulf of Lion, NW Mediterranean
Provedor de dados: 5
Autores: 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

Bathymétrie du secteur atlantique du banc Porcupine (ouest de l'Irlande) au cap Finisterre (Espagne)
Provedor de dados: 5
Autores: 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

Importations et remaniements de thanatofaunes dans les sables de la plate-forme profonde des approches occidentales de la Manche
Provedor de dados: 5
Autores: 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

Palaeomagnetic and rock magnetic analysis of Holocene deposits from the Adriatic Sea: detecting and dating short-term fluctuations in sediment supply
Provedor de dados: 5
Autores: 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

Seasonal variation of riverine nutrient inputs in the northern Bay of Biscay (France), and patterns of marine phytoplankton response
Provedor de dados: 5
Autores: 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

The Aquitaine Shelf edge (Bay of Biscay): a primary outlet for microbial methane release
Provedor de dados: 5
Autores: Dupré, Stephanie; Loubrieu, Benoit; Pierre, C.; Scalabrin, Carla; Guerin, Charline; Ehrhold, Axel; Ogor, Andre; Gautier, Emeric; Ruffine, Livio; Biville, Romain; Saout, Johan; Breton, C; Floodpage, J.; Lescanne, M.
A few thousand (2612) seeps are releasing microbial methane bubbles from the seafloor at the Aquitaine Shelf edge (Bay of Biscay) at shallow water depths (140‐220 m). This methane contributes to the formation of meter‐scale subcircular carbonate structures, which are (sub‐)outcropping over 375 km2. Based on in situ flow rate measurements and acoustic data, and assuming steady and continuous fluxes over time, the methane entering the water column is estimated to 144 Mg/yr. Microbial methane circulation has been on‐going for at least a few thousand years. This discovery highlights the importance of microbial methane generation, disconnected from deep thermogenic sources and gas hydrates, at continental shelves. The shelf edge may be viewed as a focus area...
Tipo: Text
Palavras-chave: Microbial methane; Continental shelf; Fluid emissions; High‐resolution acoustics; Aquitaine Margin; Methane‐derived authigenic carbonates.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00618/72982/72057.pdf

Diversity and composition of macrobenthic community associated with sandy shoals of the Louisiana continental shelf
Provedor de dados: 5
Autores: 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

Atlas Hydrologique des eaux superficielles du plateau continental mauritanien
Provedor de dados: 20
Autores: 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

Short-term variability in alongshore  winds and temperature off Swakopmund, Namibia, during a non-upwelling event in 1998-1999.
Provedor de dados: 20
Autores: Bartholomae, Ch.; Hagen, E.
Swakopmund is a popular coastal resort in Namibia, especially during the summer holiday season when daily sea temperatures can fluctuate several degrees in a short period. Hourly measurements of the nearbottom water temperature were collected off the Swakopmund Jetty to investigate the thermal variability in relation to local winds. The thermal regime of this coastal region appears to be controlled by the locally forced Ekman offshore transport. Related changes in offshore transport led those of the surf-zone temperature by about one day. A transfer of kinetic energy from the alongshore wind into the temperature field of the nearshore zone dominated relative short time scales (hourly). The longer periods (7–9 days) are associated with the forcing of...
Tipo: Journal Contribution
Palavras-chave: Variability; Winds; Temperature; Upwelling; Fish species; Shelf geology; Currents (water); Anomalies; Surf; Continental shelf; Coastal upwelling; Nearshore environment.
Ano: 2007
URL: http://hdl.handle.net/1834/4936

Study of the structure and dynamics of demersal fish assemblages on the continental shelf and upper slop off Ghana, West Africa
Provedor de dados: 20
Autores: Koranteng, K.A.
Using two-way indicator species analysis and detrended correspondence analysis,  species on the continental shelf and upper slope of Ghana were classified into six assemblages.  The structure of the assemblages is determined primarily by depth and type of sediment on the seabed. There are clear faunal discontinuities around 30-40 m, 100 m and 200 m depth.  The dynamics of the assemblages are influenced by physico-chemical parameters of the water masses, mainly temperature, salinity and dissolved oxygen which are periodically modified by the seasonal coastal upwelling that occurs in the area. The observed changes in the composition and relative importance of species in the assemblages can be related to increased fishing activity and environmental forcing.
Tipo: Journal Contribution
Palavras-chave: Species assemblages; Ghana; Slop; Structure and dynamics; Demersal fish; Continental shelf.
Ano: 1998
URL: http://hdl.handle.net/1834/234

A new species of Anna (Mollusca: Neogastropoda: Buccinidae) from Brazil
Provedor de dados: 103
Autores: 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

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
Provedor de dados: 104
Autores: 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 &amp;amp; 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 &amp;amp; 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

FIRST RECORD OF BRITTLE-STAR SCHIZOSTELLA BIFURCATA (ECHINODERMATA: OPHIUROIDEA) IN THE COLOMBIAN CARIBBEAN
Provedor de dados: 50
Autores: 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: Info:eu-repo/semantics/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