Consulta: subjectFacets:"Bay of Biscay"
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Data/hora: 07/06/2024 08:48:37

A bio-economic analysis of long term changes in the production of French fishing fleets operating in the Bay of Biscay
Provedor de dados: 5
Autores: Steinmetz, Fabien; Thebaud, Olivier; Blanchard, Fabian; Le Floc H, Pascal; Bihel, J.
Selective fishing pressure on more highly valued marine living resources is one of the key factors proposed to explain changes occurring in fish communities and associated landings of commercial fisheries. The aim of this paper is to establish the nature of changes in the landings of French fishing fleets operating in the Bay of Biscay in the period 1973-2002, and whether these changes could be related to the relative economic attractiveness of different fish species. The analysis focuses on trends observed in the landings of all commercial fish species over the last three decades. It is based on data of annual quantities landed and ex-vessel prices compiled from official French landings records, and on bio-geographical descriptors of these species derived...
Tipo: Text
Palavras-chave: North Eastern Atlantic; Bay of Biscay; Long term changes; Bio economic analysis; French fisheries production.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-5926.pdf

Typology of hydrological structures modelled and observed over the Bay of Biscay shelf
Provedor de dados: 5
Autores: Planque, Benjamin; Lazure, Pascal; Jegou, Anne-marie.
Collecting hydrological observations over the whole Bay of Biscay continental shelf can require several weeks. As a result, the observations are not truly synoptic and the interpretation of hydrological structures is corrupted by the time-lags between observations at distinct locations. We evaluated the effects of non-synoptic sampling during a spring cruise (17 April to 13 May 2000), using outputs from 3D hydrodynamic models as a substitute for true synoptic sampling. We developed a method for clustering hydrological regions based on the vertical structure of the water column and temporal changes in hydrography. In parallel, outputs from the 3D model were compared with field observations. The results show that in spring 2000 the Bay of Biscay continental...
Tipo: Text
Palavras-chave: Typology; Spatial temporal interactions; Hydrodynamics; Clustering analysis; Bay of Biscay.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3959.pdf

Historical fluctuations in spawning location of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the Bay of Biscay during 1967-73 and 2000-2004
Provedor de dados: 5
Autores: Bellier, Edwige; Planque, Benjamin; Petitgas, Pierre.
The spatial extent of small pelagic fish spawning habitat is influenced by environmental factors and by the state of the adult population. In return, the configuration of spawning habitat affects recruitment and therefore the future structure of the adult population. Interannual changes in spatial patterns of spawning reflect variations in adult population structures and their environment. The present study describes the historical changes in the spatial distribution of spawning of anchovy (Engraulis encrasicolus) and sardine (Sardina pilchardus) in the Bay of Biscay during two periods: 1967-72 and 2000-2004. Using data from egg surveys conducted in spring, the spatial distributions of anchovy and sardine eggs are characterized by means of geostatistics....
Tipo: Text
Palavras-chave: Spawning habitat; Spatial patterns; Sardine; Long term changes; Bay of Biscay; Anchovy.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2179.pdf

Spatial and Seasonal Distributions of Frontal Activity over the French Continental Shelf in the Bay of Biscay
Provedor de dados: 5
Autores: Yelekci, Ozge; Charria, Guillaume; Capet, Xavier; Reverdin, Gilles; Sudre, Joel; Yahia, Hussein.
The frontal activity in coastal regions remains a research field where a large number of open questions needs to be addressed to quantify the potential impact of these processes on dependent systems (e.g. biogeochemical activity). Spatial and seasonal distributions of Sea Surface Temperature (SST) fronts (∼1-100 km) in the vicinity of main French rivers, Gironde and Loire, are explored over the continental shelf North of 45 °N in the Bay of Biscay. A high resolution (1 km spatial and daily temporal resolutions) dataset of 11 years' (2003 to 2013) remotely sensed SST by MODIS sensor onboard Aqua and Terra satellites has been investigated and compared with coastal numerical model experiments. The detection and characterization fronts with fluctuating...
Tipo: Text
Palavras-chave: Bay of Biscay; Fronts; Submesoscale; Satellite; Sea surface temperature; Singularity exponent.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00389/50013/50602.pdf

Fluid emissions at the Aquitaine Shelf (Bay of Biscay, France): A biogenic origin or the expression of hydrocarbon leakage?
Provedor de dados: 5
Autores: Dupre, Stephanie; Berger, Laurent; Le Bouffant, Naig; Scalabrin, Carla; Bourillet, Jean-francois.
Fishery acoustic surveys conducted in the Bay of Biscay and dedicated to monitoring and predicting pelagic ecosystem evolution reveal numerous active seeps on the Aquitaine Shelf, east of the shelf break, at water depths ranging from 140 to 185 m. Some acoustic anomalies recorded in the water column with hull-mounted single and multibeam echosounders are clearly caused by fluid escape at the seabed, most likely gases. These fluid emissions are associated at the seafloor with high backscatter subcircular small-scale mounds, on average less than 2 m high and a few metres in diameter. Based on near-bottom video and acoustic surveys, these mounds are interpreted to be by-products of gas seepage, possibly methane-derived authigenic carbonates. The spatial...
Tipo: Text
Palavras-chave: Bay of Biscay; Aquitaine Shelf; Parentis Basin; Fluid; Seepage; Acoustics.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00201/31192/29888.pdf

Evolution of upper layer temperature in the Bay of Biscay during the last 40 years
Provedor de dados: 5
Autores: Michel, Sylvain; Vandermeirsch, Frederic; Lorance, Pascal.
The temperature evolution over the past 40 years in the Bay of Biscay (North-East Atlantic) is investigated from an in situ data analysis, completed with a satellite SST (Sea Surface Temperature) analysis over the last 20 years. The in situ dataset is an interannual version of the BoByClim climatology, covering the Bay of Biscay area with a 10-km horizontal resolution and a 5-m vertical step. The satellite dataset is the European COastral Sea Operational Observing and Forcast System Program (ECOOP) daily analysis, covering the IBIROOS (Iberian-Biscay-Irish Sea) area with a 4-km resolution. The study area (43 degrees N-50 degrees N/12 degrees W-1 degrees W) extends over the intersection of the domains covered by these two analyses. In the 0-200 m layer of...
Tipo: Text
Palavras-chave: Upper layer; Climatic change; Air sea flux; Ocean circulation model; Satellite and in situ measurements; Ecosystem; Bay of Biscay.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11166/7519.pdf

Processus et enregistrements sédimentaires dans les canyons sous-marins Bourcart et de Capbreton durant le dernier cycle climatique.
Provedor de dados: 5
Autores: Gaudin, Mathieu.
Submarine canyons cutting continental shelves and slopes are considered to be erosive features allowing continental derived sediment to reach the deep sea. In order to better understand their sedimentary dynamic and morphologic evolution through time, two submarine canyons, the Bourcart canyon in the Gulf of Lion and the Capbreton canyon in the Bay of Biscay have been studied. The Bourcart canyon, located at the shelf break at 110 m water depth, is disconnected from direct sediment supply during sea-level highstand and is considered as inactive. The Capbreton canyon's head is located 400 m off the coastline, and is disconnected from the Adour river since the 16th century. Bathymetric, core, radioisotopic and current data showed that these canyons are...
Tipo: Text
Palavras-chave: Seal level variations; Last climatic cycle; Gravity currents; Dense water cascading; Coarse grained sedimentation; Gulf of Lion; Bay of Biscay; Submarine canyon; Variations du niveau marin; Dernier cycle climatique; Courants gravitaires; Plongées d'eau dense; Sédimentation sableuse; Golfe du Lion; Golfe de Gascogne; Canyon sous marin.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/these-2511.pdf

Pb, Zn, Cs, Sc and rare earth elements as tracers of the Loire and Gironde particles on the Biscay shelf (SW France)
Provedor de dados: 5
Autores: Jouanneau, Jm; Weber, O; Grousset, Fe; Thomas, B.
The western Atlantic continental margin of the Bay of Biscay is characterised by a combined macro-tidal and a high energy environment. These conditions are responsible for the essentially sandy sedimentary cover along with well-defined fine deposit zones observed on the shelf. The main continental sources are the Loire, Gironde and Adour Rivers. It is estimated that 2.4 to 2.5 million tons of fine sediments are supplied annually to the ocean from these rivers of the French Atlantic coast. The Gironde and the Loire contribute with 84 % and the Gironde with 60 % of this amount. Previous studies of the distribution of the clay mineral assemblages and of oligo-elements have distinguished two provinces (north and south Biscay areas) according to these riverine...
Tipo: Text
Palavras-chave: Sédiment fin; Source; Métaux traces; Terre rare; Golfe de Gascogne; Fine-grained sediment; Origin; Heavy metal; Rare earth element; Bay of Biscay.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43682/43192.pdf

Fishing effects on the diversity dynamics of demersal fish communities. Comparative analysis of the role of the interactions between specices in the Bay of Biscay and in the Gulf of Lion (France).
Provedor de dados: 5
Autores: Blanchard, Fabian.
This work deals with the fishing effects on the diversity dynamics of demersal fish communities, focusing on the biotic interactions. Multispecies indices were used in order to characterise the demersal fish community dynamics of the Bay of Biscay and of the Gulf of Lions. These are the diversity indices, the temporal variability of the total biomass and of the slope of the number size spectra and the slope of the species-area curves (spatial segregation). The data were provided by yearly bottom trawl surveys EVHOE, CHALIST and MEDITS carried out in these two areas since 1983 by IFREMER for stock assessment. The differences between areas are related to a fishing index (mean value of the annual landings of demersal fish per surface area). Other areas are...
Tipo: Text
Palavras-chave: Demersal fish; ANE; Bay of Biscay; Gulf of Lions; Fish communities; Fishing impact; Biodiversity; Biotic interactions; Spatial segregation; Biomass variability; Size spectrum.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00000/10248/7688.pdf

Direct assessment of anchovy by the Pelgas06 acoustic survey
Provedor de dados: 5
Autores: Masse, Jacques; Mehault, Sonia; Beillois, Pierre; Duhamel, Erwan; Planque, Benjamin; Petitgas, Pierre; Biseau, Alain.
An acoustic survey was carried out in the bay of Biscay from May 1st to May 30th  on board the French research vessel Thalassa. The objective of PELGAS06 survey was to study the abundance and distribution of pelagic fish in the Bay of Biscay. The target species were mainly anchovy and sardine and were considered in a multi-specific context. The results have to be used during ICES working groups in charge of the assessment of sardine, anchovy, mackerel and horse mackerel and in the frame of the Ifremer fisheries ecology program "resources variability"
Tipo: Text
Palavras-chave: Bay of Biscay; Plakton net; Trawl; CUFES; Survey; Acoustic; ICES; PELGAS; Anchovy; Golfe de Gascogne; Filet à plancton; Chalut; CUFES; Campagne; Acoustique; CIEM; PELGAS; Anchois.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/acte-2291.pdf

Grands invertébrés et poissons observés par les campagnes scientifiques. Atlas de distribution. Bilan 2008
Provedor de dados: 5
Autores: Trenkel, Verena; Berthele, Olivier; Lorance, Pascal; Bertrand, Jacques; Brind'Amour, Anik; Cochard, Marie-laure; Coppin, Franck; Leaute, Jean-pierre; Mahe, Jean-claude; Morin, Jocelyne; Rochet, Marie-joelle; Salaun, Michele; Souplet, Arnauld; Verin, Yves.
Depuis une vingtaine d'années, l'Ifremer organise des campagnes de pêche scientifique en mer du Nord, Manche, Atlantique et Méditerranée concernant les ressources pélagiques, démersales et benthiques. L'objectif prioritaire est de produire des indices d'abondance des principales espèces commerciales. Elles recueillent également des données sur les espèces capturées non commerciales.  Les campagnes sont réalisées selon des plans d'échantillonnage standardisés. L'engin de pêche et son gréement, la position des stations, le tri des captures, les prélèvements biologiques suivent des protocoles fixés. Chaque zone étudiée est découpée en fonction de la profondeur, de la latitude ou d'autres critères. L'échantillonnage prévoit un nombre de traits de chalut...
Tipo: Text
Palavras-chave: Populations; Halieutique; Bulletin; Méditerranée; Golfe de Gascogne; Manche; Mer du Nord; France; Pêche; Campagnes à la mer; Atlas; Survey; Mediterranean Sea; Bay of Biscay; English Channel; North Sea; France; Populations; Fishery science; Bulletin; Atlas.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/rapport-6976.pdf

Surface water circulation patterns in the southeastern bay of biscay: new evidences from hf radar data
Provedor de dados: 5
Autores: Solabarrieta, Lohitzune; Rubio, Anna; Castanedo, Sonia; Medina, Raul; Charria, Guillaume; Hernandez, Carl.
High Frequency (HF) radar stations have been working operationally in the southeastern part of the Bay of Biscay since 2009. The (2) systems provide hourly surface currents, with 5 km spatial resolution and a radial coverage lying close to 180 km. The detailed and quantitative description of the spatial patterns observed by the HF radar offers new evidence on the main ocean processes, at different time scales, affecting a study area where surface currents show marked temporal and spatial variability. A clear seasonality in terms of sea surface currents and along-slope circulation is observed, with cyclonic and anticyclonic patterns during the winter and summer months, respectively. From the analysis of low-pass filtered currents, a key component of this...
Tipo: Text
Palavras-chave: HF radar; Surface circulation patterns; Seasonal and mesoscale variability; Inertial currents; Bay of Biscay; Iberian Poleward Current (IPC).
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00169/28063/26380.pdf

Indicator-Based Geostatistical Models For Mapping Fish Survey Data
Provedor de dados: 5
Autores: Petitgas, Pierre; Woillez, Mathieu; Doray, Mathieu; Rivoirard, Jacques.
Marine research survey data on fish stocks often show a small proportion of very high-density values, as for many environmental data. This makes the estimation of second-order statistics, such as the variance and the variogram, non-robust. The high fish density values are generated by fish aggregative behaviour, which may vary greatly at small scale in time and space. The high values are thus imprecisely known, both in their spatial occurrence and order of magnitude. To map such data, three indicator-based geostatistical methods were considered, the top-cut model, min–max autocorrelation factors (MAF) of indicators, and multiple indicator kriging. In the top-cut and MAF approaches, the variable is decomposed into components and the most continuous ones...
Tipo: Text
Palavras-chave: Top-cut; MAF; Indicators; Co-kriging; Skewed distribution; Anchovy; Bay of Biscay; Fisheries survey data; Aggregation.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00429/54021/55339.pdf

Les couches diffusantes du golfe de Gascogne : caractérisation acoustique, composition spécifique et distribution spatiale
Provedor de dados: 5
Autores: Remond, Barbara.
Fisheries acoustic data are continuously collected during ecosystemic surveys to detect sh schools of commercial species and to quantify the sh abundance. These multifrequency data also contain information about smaller target aggregations producing ubiquitous Sound Scat- tering Layers (SSLs) on the echograms, with quite diverse shape, frequency responses and taxonomic compositions. In this work, we focus on the SSLs observed in spring in the Bay of Biscay during the PELGAS surveys. The objectives are: i) to classify SSLs, ii) to describe their spatial meso-scale distribution, iii) to investigate their relationships with oher exosystme components, and iv) to investigate the taxonomic composition of resonant SSLs at ne scale. A Multiple Correspondence...
Tipo: Text
Palavras-chave: Acoustique; Multifréquences; Couches diffusantes; Micronecton; Golfe de Gascogne; PELGAS; Acoustic; Multifrequency; Sound scattering layers; Micronekton; Bay of Biscay; PELGAS.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00267/37784/35859.pdf

Fluctuations d'abondance de l'ichtyoplancton sur une zone frontale cotiere (Golfe de Gascogne: Baie d'Audierne)
Provedor de dados: 5
Autores: Camus, Patrick; Delpech, Jean-paul; Omnes, Marie-helene; Mastail, Max.
A two years ichthyoplankton sampling program over an eight station network on each side of a coastal tidal front was conducted twice a month during neap tides. A principal component analysis was performed on the data (taxa and observations) which were segregated during the summer into two groups of taxa related to two groups of stations belonging to two different hydrodynamical areas. In July and August 1980 during a tide cycle, zooplankton was investigated at two stations in the stratified and transitional area. Periodic fluctuations of meroplanktonic taxa correlated to the movement of the front induced by the tide were observed.
Tipo: Text
Palavras-chave: Ichthyoplancton; Front; Golfe de Gascogne; Analyse en composantes principales; Ichthyoplankton; Tidal front; Bay of Biscay; Principal component analysis.
Ano: 1983
URL: http://archimer.ifremer.fr/doc/00069/17991/15525.pdf

Observer les coccolithophores de l'espace
Provedor de dados: 5
Autores: Perrot, Laurie.
Coccoliths, in cells or detached, from coccolithophores are calcite plates with highly backscattering signal.Coccolithophore blooms are visible from space and are currently quantified by Calcite algorithm fromNASA applied to Ocean Color data. Coccoliths impact also the Suspended Particulate Matters (SPM) product from Ifremer, well established in the Northwest european continental shelf. Although these algorithms are independent, they are based on the same basic concepts, but Ifremer algorithm is more adaptable and allows to link up with other particles than coccoliths, as the resuspended matters or aggregates.Coccolithophore blooms identification over 18 years, from bay of Biscay to South Irelands has been established by a spectral method, allowing to...
Tipo: Text
Palavras-chave: Matières en suspension; Télédétection; Golfe de Gascogne; Coccolithophores; Blooms; Suspended Particulate Matters; Remote-sensing; Bay of Biscay.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00497/60914/64269.pdf

Compréhension des différences de distribution spatiale des anchois et de leurs œufs
Provedor de dados: 5
Autores: Godet, Claire.
La campagne PELGAS participe à la gestion du stock d’anchois du Golfe de Gascogne, en réalisant une évaluation directe à la mer de la biomasse d’anchois. Pour déterminer la biomasse totale, des appareils acoustiques envoyant des ultra-sons dans l’eau pour détecter les bancs de poisson sont utilisés. Ensuite des pêches sont effectuées sur les zones détectées pour déterminer la composition des bancs (espèces, poids, longueurs…). En parallèle, les oeufs d’anchois sont comptés. A partir des données récoltées de 2000 à 2015, j’ai pu réaliser des cartes de distribution spatiale des anchois et de leurs oeufs, ainsi que des analyses statistiques afin de comprendre les différences de distribution entre les deux. Il s’avère que les oeufs sont plus au large que les...
Tipo: Text
Palavras-chave: Anchois; Fécondité; Répartition; Golfe de Gascogne; Oeufs.; Anchovies; Fecundity; Repartition; Bay of Biscay; Eggs.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00342/45335/44797.pdf

Large-amplitude internal tides, solitary waves, and turbulence in the central Bay of Biscay
Provedor de dados: 5
Autores: Xie, X. H.; Cuypers, Y.; Bouruet-aubertot, P.; Ferron, Bruno; Pichon, Annick; Lourenco, A.; Cortes, Norbert.
Microstructure and fine-scale measurements collected in the central Bay of Biscay during the MOUTON experiment are analyzed to investigate the dynamics of internal waves and associated mixing. Large-amplitude internal tides (ITs) that excite internal solitary waves (ISWs) in the thermocline are observed. ITs are dominated by modes 3 and 4, while ISWs projected on mode 1 that is trapped in the thermocline. Therein, ITs generate a persistent narrow shear band, which is strongly correlated with the enhanced dissipation rate in the thermocline. This strong dissipation rate is further reinforced in the presence of ISWs. Dissipation rates during the period without ISWs largely agree with the MacKinnon-Gregg scaling proposed for internal wavefields dominated by a...
Tipo: Text
Palavras-chave: Internal tides; Solitary waves; Turbulence; Bay of Biscay.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00151/26232/24299.pdf

Characterising the temporal variability of the spatial distribution of animals: an application to seabirds at sea
Provedor de dados: 5
Autores: Certain, Gregoire; Bellier, E; Planque, Benjamin; Bretagnolle, V.
Understanding the patterns of spatial and temporal variations in animal abundance is a fundamental question in ecology. Here, we propose a method to quantify temporal variations in animal spatial patterns and to determine the spatial scale at which such temporal variability is expressed. The methodology extends from the approach proposed by Taylor (Taylor, L. R. 1961. Aggregation, variance and the mean. Nature 189: 732-735) and relies on models of the relationship between temporal mean and variance in animal abundance. Repeated observations of the spatial distribution of populations are used to construct spatially explicit models of Taylor's power law. The resulting slope parameters of the Taylor power law provide local measures of the temporal variability...
Tipo: Text
Palavras-chave: Temporal variability; Taylor's Power Law; Spatio temporal distribution; Seabirds; Scale dependence; Bay of Biscay.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3523.pdf

External controls on turbidite sedimentation on the glacially-influenced Armorican margin (Bay of Biscay, western European margin)
Provedor de dados: 5
Autores: Toucanne, Samuel; Zaragosi, Sebastien; Bourillet, Jean-francois; Dennielou, Bernard; Jorry, Stephan; Jouet, Gwenael; Cremer, Michel.
Sequence stratigraphic models predict increased sediment delivery to deep-water areas during sea-level lowstand. The Armorican margin (Bay of Biscay, western European margin) is an interesting area to test this hypothesis because the margin has a wide continental shelf, still partly flooded during sea-level lowstand, and the Armorican turbidite system has experienced fluctuating sediment fluxes since the last glacial period. The stratigraphic response of the Armorican turbidite system to sea-level oscillations and climate changes was assessed for the last 35,000 years through the study of the Guilcher, Crozon and Audierne levees. Millenial-timescale resolution chronostratigraphy allowed us to reconstruct the sediment accumulation and turbidite frequency,...
Tipo: Text
Palavras-chave: Armorican margin; Bay of Biscay; Turbidite systems; Turbidity currents; Levee growth; External forcing; Deglaciation; Source-to-sink.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00070/18147/15708.pdf

Acoustic observations in the Bay of Biscay: Schooling, vertical distribution, species assemblages and behaviour
Provedor de dados: 5
Autores: Masse, Jacques.
Eight acoustic surveys were carried our in the Bay of Biscay, during 1989-94, to study the distribution and abundance of anchovy (Engraulis encrasicolus, L.) in that area. Acoustic data were stored using the INES/MOVIES acquisition and processing system. Species-specific distribution patterns were confirmed through complementary sampling with a mid-water trawl. This paper summarises the combination of technical procedures used for acoustic assessments, and the results of acoustic surveys in the Bay of Biscay that pertain to the dynamics of this stock. Information is presented on the distribution and abundance of anchovy and co-occuring species, and on the movement patterns detected within the pelagic fish community, in relation to environmental conditions....
Tipo: Text
Palavras-chave: Acoustic; Anchovy; Engraulis encrasicolus; Schooling; Pelagic; Behaviour; Bay of Biscay.
Ano: 1996
URL: http://archimer.ifremer.fr/doc/00191/30265/28719.pdf

Detecting hydrological landscapes over the Bay of Biscay continental shelf in spring
Provedor de dados: 5
Autores: Planque, Benjamin; Lazure, Pascal; Jegou, Anne-marie.
A complex set of hydrodynamical structures co-exist over the Bay of Biscay continental shelf. These structures, which can spread over a limited spatial range (10s of km) and last for periods ranging from days to months, influence the rates and nature of biological production. They need to be accurately described before the mechanisms linking hydrodynamics to production can be unraveled. Such description generally requires not only 3D observations of hydrological fields (temperature, salinity, density), but also a description of how these fields vary with time. This is hardly achievable with current means of field observation but can be mimicked by hydrodynamic model simulations. Using simulations from a 3D hydrodynamic model, we developed a methodology...
Tipo: Text
Palavras-chave: Bay of Biscay; Hydrology; Hydrodynamic model; Spring; Typology.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10933/7575.pdf

La dynamique à sousmésoéchelle sur le plateau continental du Golfe de Gascogne
Provedor de dados: 5
Autores: Yelerci, Ozge.
This thesis explores the submesoscale dynamics in the Bay of Biscay continental shelf. In the first part, submesoscale features over the shelf are identified using remotely sensed high resolution sea surface temperature (SST) images by MODIS. Front detection is achieved through singularity exponents, a novel method of calculating irregularities on the SST fields, and an index for the frontal activity is generated. Results are complemented with 2.5 km horizontal resolution numerical simulations. Three main types of fronts are presented: i) tidal mixing fronts along the coast and most significantly in the Ushant region; ii) shelf break front related to internal tidal wave activity; iii) fresh water fronts along the edge of the river plumes in winter. In the...
Tipo: Text
Palavras-chave: Dynamique à sousmésoéchelle; Modèle numérique océanique a haute résolution; Golfe de gascogne; Exposants de singularité; Données satellites de température de surface de la mer; Submesoscale dynamics; Fronts; Bay of Biscay.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00497/60910/64259.pdf

Rapport sur l'utilisation du sondeur multifaisceaux ME70 lors des campagnes Pelgas08 et Class08
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Masse, Jacques; Trenkel, Verena.
Report on Simrad ME70 multibeam echosounder operations during Pelgas08 and Class08 sea surveys. First observations of small pelagic fish 3D aggregative structures
Tipo: Text
Palavras-chave: Pelagic ecosystem; Bay of Biscay; 3D fisheries acoustics; Multibeam echosounder; Écosystème pélagique; Golfe de Gascogne; Acoustique halieutique 3D; Sondeur multifaisceaux.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/rapport-6314.pdf

Effets de l'exploitation par la pêche sur la dynamique de diversité des peuplements de poissons démersaux : analyse comparée du rôle des interactions entre espèces dans le golfe de Gascogne et dans le golfe du Lion
Provedor de dados: 5
Autores: Blanchard, Fabian.
This work deals with the fishing effects on the diversity dynamics of demersal fish communities, focusing on the biotic interactions. Multispecies indices are used in order to characterize the demersal fish community dynamics of the Bay of Biscay and of the Gulf of Lions. These are the diversity indices, the temporal variability of the total biomass and of the slope of the number size spectra and the slope of the species-area curves (spatial segregation). The yearly bottom trawl surveys EVHOE, CHALIST and MEDITS, carried out in these two areas since 1983 by IFREMER for the stocks assessment provide the data. The differences between areas are related to a fishing index (mean value of the annual landings of demersal fish per surface area). Other areas are...
Tipo: Text
Palavras-chave: Gulf of Lions; Bay of Biscay; Medits; Chalist; Evhoe; Fishing effect; Diversity; Demersal fish; Golfe du Lion; Golge de Gascogne; Medits; Chalist; Evhoe; Descripteurs; Diversité des peuplements; Poissons démersaux.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/these-6670.pdf

Bio-economic management strategy evaluation of deepwater stocks using the FLBEIA model
Provedor de dados: 5
Autores: Garcia, Dorleta; Urtizberea, Agurtzane; Diez, Guzman; Gil, Juan; Marchal, Paul.
Deepwater fish are characterized by long lifespans, late maturity and low productivity. This implies slow recovery from low biomass levels and it is, therefore, important to manage these stocks correctly to avoid overfishing. However, these stocks are generally data poor, which it makes difficult to apply quantitative assessment models on which to base their management. The management strategy evaluation (MSE) approach consists in evaluating the performance of management strategies by simulation before their implementation. In the evaluation, the main sources of uncertainty in a fishery system and its management process should be taken into account in order to find robust management strategies. Thus, the MSE approach is relevant to the management of...
Tipo: Text
Palavras-chave: Bio-economic modelling; Deep-sea fisheries; Harvest control rules; Management strategy evaluation; Norway; Bay of Biscay; Gibraltar; Atlantic Ocean.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00176/28760/27231.pdf

Interactions of surface and deep anticyclonic eddies in the Bay of Biscay
Provedor de dados: 5
Autores: Carton, Xavier; Le Cann, Bernard; Serpette, Alain; Dubert, Jesus.
In 1990, satellite observations revealed that an anticyclonic surface eddy (a SWODDY, for Slope Water Oceanic eDDY) followed a cycloidal trajectory north of the Iberian coast in the Bay of Biscay. To understand the mechanisms underlying such a trajectory, we study the evolution of an idealized surface eddy in a two-layer flat-bottom quasi-geostrophic model. The effect of several processes is studied, notably the presence of deep anticyclonic vorticity. This deep vorticity may result either from the tilting of the swoddy itself, or from the presence of an anticyclonic eddy of different origins, such as a meddy (Mediterranean Water EDDY). We also study the influence of a zonal coast south of the swoddy, via the "mirror effect". Firstly, a point-vortex model...
Tipo: Text
Palavras-chave: Bay of Biscay; Anticyclonic eddies; Swoddy; Meddy; Point vortex dynamics; Trajectory; Quasi-geostrophic model; In-situ observations.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00125/23589/21478.pdf

Description mathématique de la croissance de Lesueurigobius friesii (Teleostei, Gobiidae). Essai de synthèse
Provedor de dados: 5
Autores: Gros, Philippe.
A population of the burrowing goby Lesueurigobius friesii was studied from 1974 to 1979, at a sampling station located on a Nephrops ground in the northem Bay of Biscay, off the south coast ofBrittany; samples were collected close to a muddy bottom, at depths ranging from 80 to 100 m. Data on demographie structures were obtained by two independent exercises: examination of oto1iths and the analysis of length-frequency distributions. The fish attains a standard length of at !east 71 mm and an age of 6 years. Most growth takes place during the first three years of !ife, and proceeds very slowly thereafter. The state of gonad development was assessed qualitatively by visual inspection of the body cavity of females; spawning occurs in spring, and by July 61 of...
Tipo: Text
Palavras-chave: Croissance; Modèle de Von Bertalanffy; Comparaison de courbes de croissance; Téléostéens; Golfe de Gascogne; Growth; Von Bertalanffy's model; Comparison of growth curves; Teleostei; Bay of Biscay.
Ano: 1980
URL: http://archimer.ifremer.fr/doc/00122/23302/21129.pdf

Distribution des Decapodes dans le Sud du Golfe de Gascogne
Provedor de dados: 5
Autores: Lagardere, Jean-paul.
An inventory of 93 species of decapod living in this region on moveable substrate at depths of 1-1300m including a description of the main groups. Some factors such as granulometry, temperature and food which determine their distribution in the continental slope are analysed. An index, groups these 93 species into 30 families and indicates rare or infrequently found species and their station numbers.
Tipo: Text
Palavras-chave: Bay of Biscay; Species inventory; Geographical distribution; Decapode.
Ano: 1973
URL: http://archimer.ifremer.fr/doc/1973/publication-2226.pdf

A restricted fishing area as a tool for fisheries management: Example of the Capbreton canyon,southern Bay of Biscay
Provedor de dados: 5
Autores: Sanchez, Florence; Morandeau, Gilles; Bru, Noelle; Lissardy, Muriel.
Marine Protected Areas (MPAs) are generally considered as one of the most important tools, among the many regulations, designed to preserve marine resources as well as enhance fisheries. In the southern Bay of Biscay, local French fishermen requested creation of a restricted area to help settle disputes between the various métiers operating there. This restricted area, which lies mainly in French waters, covers part of a deep submarine canyon off the French and Spanish coasts, known to have a large population of mature hake. This study aims to better understand the effects of a restricted area upon French fleets operating there, particularly upon three main métiers – longliners, gillnetters and trawlers. The study area includes three ICES statistical...
Tipo: Text
Palavras-chave: Bay of Biscay; Restricted area; Submarine canyon; Economic dependence; Metiers' dynamics.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00128/23961/22005.pdf

Prospection et échantillonnage des émissaires en mer au large de la côte basque. Rapport de campagne - Micropolit année 1
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Huguenin, Laura; Lissardy, Muriel.
This work aims to summarize the work carried out in the framework of surveys in subtidal environment on the French Basque coast in 2017. The course of this campaign is presented as well as the various data collected making it possible to establish a balance sheet. The latter refers to the fact that only one of the three targeted steps could be correctly sampled from a biological and ecological point of view. The analysis of the difficulties encountered during these investigations will make it possible to reframe the implementation of the protocol in order to best meet the objectives originally set during the 2018 sampling program.
Tipo: Text
Palavras-chave: Golfe de Gascogne; Émissaires subtidaux; État de conservation; Communautés benthique; Bay of Biscay; Subtidal outfall; Conservation index; Benthic communities.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00406/51739/52687.pdf

Apports des données de la 'couleur de l'eau' à la modélisation couplée physique-biogéochimie en milieu dynamique côtier : Application au Rio de la Plata et au Golfe de Gascogne
Provedor de dados: 5
Autores: Huret, Martin.
Continental margins play a crucial role in biogeochemical fluxes between the continents and the open ocean. They are also highly sensitive to human perturbations. Primary production is highly dependent on the complex dynamics of these coastal zones, and on the river supply in nutrients, as well as in Suspended Particulate Matter (SPM) which limit light availability. The quantification of the production is a prerequisite in many applications, from the understanding of the role of the coastal ocean in climate change, to eutrophication and fisheries resources issues within the frame of the integrated management of the coastal zone.  Coupled physical-biogeochemical models are useful in studying and monitoring primary production. Because of the numerous complex...
Tipo: Text
Palavras-chave: Parameter estimation; Data assimilation; Suspended Particulate Matter (SPM); Chlorophyll a; Phytoplankton blooms; Physical biogeochemical coupled model; Ocean color; Satellite data; Coastal area; Bay of Biscay; Rio de la Plata; Estimation de paramètres; Assimilation de données; Matières En Suspension (MES); Chlorophylle a; Blooms phytoplanctoniques; Modèle couplé physique biogéochimie; Couleur de l'eau; Donnée satellitale; Milieu côtier; Golfe de Gascogne; Rio de la Plata.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/these-337.pdf

Direct assessment of anchovy by the PELGAS04 acoustic survey
Provedor de dados: 5
Autores: Masse, Jacques; Beillois, Pierre; Duhamel, Erwan.
An acoustic survey was carried out in the bay of Biscay from April 27th to May 25th on board the French research vessel Thalassa. The objective of PELGAS04 survey was to study the abundance and distribution of pelagic fish in the Bay of Biscay. The target species were mainly sardine and anchovy but had to be considered in a multi-specific context. The results have to be used during ICES working groups in charge of the assessment of sardine, anchovy, mackerel and horse mackerel and in the frame of the Ifremer fisheries ecology program "resources variability".
Tipo: Text
Palavras-chave: Pelagic; FOREVAR; Bay of Biscay; Anchovy; Acoustic; Survey; ICES; PELGAS; Pélagique; FOREVAR; Golfe Gascogne; Anchois; Acoustique; Campagne océanographique; CIEM; PELGAS.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-2295.pdf

Evaluation des ressources halieutiques par les campagnes scientifiques françaises - Façade "Manche est" et façade "Loire-Gironde"
Provedor de dados: 5
Autores: Delpech, Jean-paul; Mahe, Kelig; Mehault, Sonia; Rostiaux, Emilie; Biais, Gerard; Coppin, Franck; Vaz, Sandrine.
This report is a result of a contract between Ifremer and the French Ministry of Industry. The aim was to map the distribution of the fisheries resources from french scientific surveys. Two areas have been selected:  - the "Eastern Channel" area, including 7 administrative departments : Nord, Pas-de-Calais, Somme, Seine-Maritime, Eure, Calvados and Manche. - the "Loire-Gironde" area, including 4 administrative departments : Loire-Atlantique, Vendée, Charente-Maritime and Gironde.
Tipo: Text
Palavras-chave: Bay of Biscay; Eastern Channel; Juvenile; Adult; Abundance index; Specific richness; Mapping; Fisheries; Scientific survey; Golfe de Gascogne; Manche est; Juvénile; Adulte; Indice d'abondance; Richesse spécifique; Cartographie; Campagne halieutique.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-6642.pdf

Bathyal cumacean assemblages from the southern margin of the Cap Ferret Canyon (SE Bay of Biscay)
Provedor de dados: 5
Autores: Corbera, Jordi; Sorbe, Jean Claude.
The structure of the cumacean assemblages from the southern margin of the Cap Ferret Canyon was studied at 13 stations ranging from 346 to 1099 m depth with a modified Macer-GIROQ suprabenthic sledge (four superimposed nets; 0.5 mm mesh size). A total of 1885 specimens were collected and classified into 5 families and 42 species. The total abundances fluctuated between 2.8 ind./100 m2 (station TS04; 484-485 m) and 55.8 ind./100 m2 (station TS08; 714-708 m). The highest values of species richness and diversity were recorded at station TS13 (1097-1099 m): S=25 species; H’(log2)=4.05. The near-bottom vertical distribution of the cumacean fauna showed the same pattern at all stations: at least 60% of the individu­als were sampled by the lower net of the sledge...
Tipo: Text
Palavras-chave: Cumacea; Assemblages; Suprabenthos; Bathyal; Bay of Biscay; NE Atlantic Ocean.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00629/74124/73558.pdf

South-Eastern Bay of Biscay eddy-induced anomalies and their effect on chlorophyll distribution
Provedor de dados: 5
Autores: Caballero, Ainhoa; Rubio, Anna; Ruiz, Simon; Le Cann, Bernard; Testor, Pierre; Mader, Julien; Hernandez, Carlos.
The analysis of deep-water glider hydrographic and fluorescence data, together with satellite measurements provides a new insight into eddy-induced anomalies within the South-Eastern Bay of Biscay, during summer. Two cyclonic eddies and a SWODDY have been observed in different glider transects and by means of different sources of satellite data. Vertical profiles reveal complex structures (characteristic of the second baroclinic mode): upward/downward displacement of the seasonal/permanent thermocline in the case of X13 and the opposite thermocline displacements in the case of the cyclones. This is a typical behaviour of mode-water and “cyclonic thinny” eddies. A qualitative analysis of the vertical velocities in the anticyclone indicates that though...
Tipo: Text
Palavras-chave: Eddies; Bay of Biscay; Glider; Hydrography; Mesoscale; Eddy-wind.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00326/43725/43176.pdf

Pyruvate kinase activity as index of carbohydrate assimilation by mesozooplankton: an early field implementation in the Bay of Biscay, NE Atlantic
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Herbland, Alain.
Estimates of carbohydrate assimilation within the mesozooplankton compartment are a fundamental concern in oceanography because they give a general expression of the biologically-regulated incorporation of metabolic fuel produced from inorganic nutrients by phytoplankton in the sea. A new tool is proposed for the assessment of such processes. It is based on the measurement of the activity of an enzyme, pyruvate kinase (PK), on samples of the whole mesozooplankton community. Here, the results are presented of an early attempt at such an implementation in the Bay of Biscay (north-east Atlantic) in springtime. A main area situated in front of an estuary (Gironde) has been extensively studied-the same sampling grid was covered on three occasions (two 20 day...
Tipo: Text
Palavras-chave: Bay of Biscay; Zooplankton; Phytoplankton; Pyruvate kinase; Carbohydrate.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-452.pdf

A multi-decadal hindcast of a physical–biogeochemical model and derived oceanographic indices in the Bay of Biscay
Provedor de dados: 5
Autores: Huret, Martin; Sourisseau, Marc; Petitgas, Pierre; Struski, Caroline; Leger, Fabien; Lazure, Pascal.
Multiple year oceanographic simulations (hindcast) are identified as a priority oceanography product for fisheries and environment studies since they provide a unique continuous long-term dataset allowing integrated assessment of the ocean state and evolution. We performed a 37 year (1972–2008) hindcast run with a coupled physical–biogeochemical model in the Bay of Biscay. The coupled model and the hindcast configuration are described. A model skill assessment is performed with a large set of in-situ data. Average seasonal currents show major circulation patterns over the shelf. Among tracers, temperature and salinity have the best agreement, ahead of nitrates and silicates, chlorophyll, and finally phosphates and ammonium. For chlorophyll, improved...
Tipo: Text
Palavras-chave: Physical-biogeochemical model; Hindcast; Skill assessment; Environmental indices; Seasonal pattern; Interannual variability; Fisheries oceanography; Bay of Biscay.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00114/22538/20237.pdf

Tidal level influence on the spawning process of the sea urchin Paracentrotus lividus (Lamarck, 1816) on a rocky shore (Bay of Biscay).
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Mahias, Jeremy; Castets, Virginie; Caill-milly, Nathalie; Bru, Noelle; Lissardy, Muriel.
The sea urchin Paracentrotus lividus is an important exploited resource on the Mediterranean coast and has been the subject of much research. In the Bay of Biscay, the situation is different, as some studies have been conducted on the Spanish Basque coast but few on the French part of that coast. However, the Basque coast offers favourable conditions for the development of this species, and its exploitation could be a source of potential diversification for fishermen, especially in the context of difficulties with some other resources. At the request of the managers of this coastal resource, a study was undertaken on sea urchins to improve knowledge of this stock, particularly about its biological characteristics. In this work, assessment consisted of...
Tipo: Text
Palavras-chave: Sea urchin; Bay of Biscay; Spawning; Tidal level; Rocky coast.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00361/47216/47172.pdf

Marine litter in submarine canyons of the Bay of Biscay
Provedor de dados: 5
Autores: Van Den Beld, Inge; Guillaumont, Brigitte; Menot, Lenaick; Bayle, Christophe; Arnaud-haond, Sophie; Bourillet, Jean-francois.
Marine litter is a matter of increasing concern worldwide, from shallow seas to the open ocean and from beaches to the deep-seafloor. Indeed, the deep sea may be the ultimate repository of a large proportion of litter in the ocean.  We used footage acquired with a Remotely Operated Vehicle (ROV) and a towed camera to investigate the distribution and composition of litter in the submarine canyons of the Bay of Biscay. This bay contains many submarine canyons housing Vulnerable Marine Ecosystems (VMEs) such as scleractinian coral habitats. VMEs are considered to be important for fish and they increase the local biodiversity. The objectives of the study were to investigate and discuss: i) litter density, ii) the principal sources of litter, iii) the influence...
Tipo: Text
Palavras-chave: Litter; Anthropogenic impact; Canyons; Deep Sea; Bay of Biscay; ROV; Towed camera.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00332/44363/43968.pdf

Coccolith-derived turbidity and hydrological conditions in May in the Bay of Biscay
Provedor de dados: 5
Autores: Perrot, Laurie; Gohin, Francis; Ruiz-pino, Diana; Lampert, Luis; Huret, Martin; Dessier, Aurelie; Malestroit, Pascale; Dupuy, Christine; Bourriau, Paul.
Coccolithophore blooms occur regularly from April to June in the Bay of Biscay where they have been observed for many years from ocean-colour imagery thanks to the ability of their calcite plates to scatter light. They are easily depicted on interpolated images of non-algal Suspended Particulate Matter (SPM) derived from satellite reflectance data in May, at the time of the PELGAS (PELagique GAScogne) annual surveys. Over the springs 2012 to 2015, the PELGAS surveys provided in-situ data on the turbidity throughout the water column and on the hydrological environment prevailing during the blooms in the vicinity of the continental shelf break. The satellite-derived SPM in the area of coccolithophore blooms was closely related to measured turbidity in the...
Tipo: Text
Palavras-chave: Bay of Biscay; Ocean colour; Suspended particulate matter; Turbidity; Coccoliths; Stratification.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00416/52790/53689.pdf

Estimating gear efficiency in a combined acoustic and trawl survey, with reference to the spatial distribution of demersal fish
Provedor de dados: 5
Autores: Doray, Mathieu; Mahevas, Stephanie; Trenkel, Verena.
Few analyses have been performed to estimate the efficiency of trawls targeting demersal fish using the ratio of catches and acoustic densities. In summer 2006, acoustic and fishing data were collected simultaneously over 3 d by three fishing vessels equipped with identical pelagic trawls in the Bay of Biscay. Variography identified moderate spatial autocorrelation in the acoustic backscatter at a mean scale of 3 km, a scale slightly smaller than the mean haul length (3.5 km), indicating that fish horizontal availability did not influence trawl efficiency. Acoustic backscattering densities expressed as nautical area scattering coefficients (NASCs) recorded in the trawled layer were compared with equivalent NASC (ENASC) values calculated from the species...
Tipo: Text
Palavras-chave: Availability; Bay of Biscay; Catchability; Generalized linear model; Geostatistics; Hake; Vulnerability.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00002/11372/7980.pdf

Hide and seek in the Bay of Biscaya functional investigation of marine megafauna and small pelagic fish interactions
Provedor de dados: 5
Autores: Lambert, Charlotte; Authier, Matthieu; Doray, Mathieu; Doremus, Ghislain; Spitz, Jerome; Ridoux, Vincent.
Prey and predator distributions influence one another. Understanding the scale and the orientation of predator-prey spatial correlations is crucial in foraging ecology. Growing evidence suggests that predator-prey interactions are more constrained by functional characteristics of both the predator and the prey. Unfortunately, in marine pelagic systems, the scale and orientation of spatial correlations between predators and prey have been only little explored from a functional point of view. We tested the existence of fine-scale association between predators and fish functional groups. Visual predator sightings and acoustic fish records were collected synchronously during oceanographic surveys from 2004 to 2014. Prey biomass was integrated by nautical miles...
Tipo: Text
Palavras-chave: Bay of Biscay; Cetaceans; Functional traits; Marine top predators; Predator avoidance; Predator-prey interactions; Prey profitability; Seabirds.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00488/59998/63448.pdf

Typologies et composantes des flottilles du sud du golfe de Gascogne, en 1989. Comparaison de 1986 et 1989. De Noirmoutier à Bayonne
Provedor de dados: 5
Autores: Decamps, Philippe; Leaute, Jean-pierre.
This document presents an analysis of the Southern Bay of Biscay fishing fleet based on records of fishing activities during 1989, using the same variables and multivariate ordination techniques than 1986's analysis. It reveals groups of vessels having similar fishing patterns with regard to utilization of various gears, areas fished and species caught. The components of the 2 years are compared and evolutions of fishing fleet studied.
Tipo: Text
Palavras-chave: Typologie; Flotilles; Composantes; Golfe de Gascogne; Typology; Fishing fleet; Components; Bay of Biscay.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00266/37730/35740.pdf

Observations ichtyologiques effectuées en 2005
Provedor de dados: 5
Autores: Quero, Jean-claude; Spitz, J.
In 2005, a flying fish Cheilopogon cyanopterus, which doesn't figure among the Europeans faunas although pointed out in 1973, is captured in the Bay of Biscay. Following the catch of a Cubiceps gracilis near the coast in Britain, the authors recapitulating the former descriptions indicate that adults of this oceanic species remain in the open sea. Only juveniles come, rarely, to the coast. The species figures in the diet of common dolphins, striped dolphins, swordfishes and tunas. NOT CONTROLLED OCR
Tipo: Text
Palavras-chave: Prey; Bay of Biscay; Cubiceps gracilis; Cheilopogon cyanopterus; Pisces; Golfe de Gascogne; Distribution; Cubiceps gracilis; Cheilopogon cyanopterus; Pisces.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3657.pdf

Rationalisation de l'échantillonnage biologique pour l'évaluation des stocks des pêcheries marines en golfe de Gascogne
Provedor de dados: 5
Autores: Pelletier, Dominique; Beucher, Helene; Chevalier, Robert; Laurec, Alain; Alperi, J.; Pereda, P.; Guichet, Roger; Dupouy, Herve; Peronnet, Isabelle.
The aim of the project "rationalization of biological sampling for stock assessment of marine fisheries in the bay of Biscay" is to perform statistical methods and computer programs allowing to test prognoses and diagnoses based on estimates of fishing mortalities, recruitments, yields per recruit, and the "gain-loss" function. The project gathers the laboratories of the community working on the Bay of Biscay fisheries, namely - Santander in Spain (1. E. 0) - La Rochelle and Lorient in France (IFREMER). A descriptive study has been carried out. The prepared documents contain a description of the procedures used to collect the information, by each of the laboratories involved, on: - landings - biological samplings. More comprehensive data have been gathered...
Tipo: Text
Palavras-chave: Capture; Marine biology; Fisheries; Megrim; Monk; Hake; Data collection; TAC; Bay of Biscay; Stock assessement; Sampling; Statistics; Capture; Biologie marine; Halieutique; Cardine; Baudroie; Merlu; Collecte de données; TAC; Golfe de Gascogne; Evaluation des stocks; Echantillonnage; Statistiques.
Ano: 1991
URL: http://archimer.ifremer.fr/doc/1991/rapport-3621.pdf

Phenotypic and genetic differentiation in young-of-the-year common sole (Solea solea) at differentially contaminated nursery grounds
Provedor de dados: 5
Autores: Guinand, Bruno; Durieux, Eric D. H.; Dupuy, Celie; Cerqueira, Frederique; Begout, Marie-laure.
Growth-related characters, condition factor, and genetic differentiation were investigated for a single cohort of young-of-the-year (YOY) sole within and among nurseries with differing levels of heavy metals (Cd, Cu and Zn) contamination in the two Charentais Straits, Bay of Biscay, France. Analyses were performed when individuals recruited (May), then after a full summer spent in each nursery (October). Levels of phenotypic and genetic diversity were compared, together with genetic differentiation at a candidate metallothionein (MT) locus and three putatively neutral microsatellite loci. No phenotypic or genetic differentiation was detected among nurseries in May, but significant variation at each phenotypic trait and at the multilocus level in October (P...
Tipo: Text
Palavras-chave: Solea solea; Nursery; Bay of Biscay; Metallothionein.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00033/14392/11694.pdf

Les pêcheries mixtes de langoustine et merlu du Golfe de Gascogne, modélisation bio-économique et simulation des procédures de gestion
Provedor de dados: 5
Autores: Charuau, Anatole.
Fishing crayfish on the gulf's mudflats is a traditional business practised by 450 boats of 12 to 18 metres in length and employs 2,500 sailors. In the north of the gulf, this activity is exclusive, in the south, immature hake are also caught, because the crayfish areas coincide, in part, with the nurseries of the northern stock of this species.   Management of these fisheries, called mixed, of crayfish and hake is one of the greatest problems of the Gulf of Gascony. All assessments tend to show the responsibility of the crayfish boats in the future of the hake stock. The solution is likely to pass through a generalised increase of the 80 mm meshing that would lead, eventually, the hake stock yield to its maximum, but would eliminate a great many trades...
Tipo: Text
Palavras-chave: Mixed fisheries; Bio economical modelisation; Bay of Biscay; Simulation; Prawn; Hake; Fishing fleet strategy; Fishing assessment; Pecherie mixre; Golfe de Gascogne; Modele bio economique; Simulation; Langoustine; Merlu; Stratégie des flottilles; Gestion des pêcheries.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/rapport-2569.pdf

The French anchovy fishery
Provedor de dados: 5
Autores: Duhamel, Erwan; Biseau, Alain; Masse, Jacques; Villalobos, Hector.
The french fishery of anchovy is divided in two groups defined by gears : purse seine and pelagic trawl. The average length of these vessels is about 20m. This fleet is very opportunistic : all trawlers are using several trawls during the year, to catch sometimes bass, tuna, hake, or scampi, and purse seine are mainly fishing sardine. Each year, the main anchovy catches are provided by pair trawlers. Purse seiners operate often in coastal areas (&lt;10 nautical miles); trawlers may operate until 50 nautical miles offshore but are banned inside the three miles coastal zone. The pair trawlers may operate from Basque country to western Channel according to fish availability. Purse seiners usually stay around their home harbour.
Tipo: Text
Palavras-chave: Pelagic trawl; Purse seine; Anchovy; Bay of Biscay; Acoustic; Survey; ICES; PELGAS; Chalut pelagic; Bolinche; Anchois; Golfe de Gascogne; Acoustique; Campagne oceanographique; CIEM; PELGAS.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/acte-2296.pdf

Cross-shelf exchanges in the northern Bay of Biscay
Provedor de dados: 5
Autores: Akpınar, Anil; Charria, Guillaume; Theetten, Sebastien; Vandermeirsch, Frederic.
The spatio-temporal distribution of cross-shelf exchanges in the northern Bay of Biscay from 2007 to 2010 were investigated using a high-resolution three-dimensional model as well as sea-surface temperature and chlorophyll-a concentration satellite observations. Our results show that the net yearly mean transport was upslope each year, with 2010 showing the highest value (0.93 Sv upslope). Bottom fluxes showed peak values near Chapel Bank, with mean values of 0.1 m3 s−1 m−2 and maximum values of 0.2 m3 s−1 m−2. Our model demonstrated that cross-shelf exchanges can be divided into three vertical layers. At the surface, cross-shelf transports are driven by wind forcing (Ekman transport accounts for about 60% of the total cross-shelf transport) and mesoscale...
Tipo: Text
Palavras-chave: Cross-shelf exchanges; Shelf break; Mesoscale dynamics; Slope current; Bay of Biscay.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00606/71801/70289.pdf

Development of a hydrodynamic model of the Bay of Biscay. Validation of hydrology
Provedor de dados: 5
Autores: Lazure, Pascal; Garnier, Valerie; Dumas, Franck; Herry, Christelle; Chifflet, Marina.
The hydrology of the Bay of Biscay was investigated using the regional ocean model MARS3D (Model for Application at Regional Scale). The simulated hydrology is compared to a set of various data encompassing monthly climatology, remote sensing SST CTD casts, and coastal salinity measurements. Special focus was put on the validation over the continental shelf. This paper reports that despite some misfits, the climatological hydrology and its seasonal variability are correctly simulated. Various statistics computed over the period from 1999-2004 highlight different aspects of the hydrology. The biases and root mean square errors (RMSE) remain very weak at all depths when comparing salinity (&lt; 0.1 and &lt; 0.6psu respectively). The predicted temperature...
Tipo: Text
Palavras-chave: Bay of Biscay; Regional model; Performance assessment.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/00000/11079/9282.pdf

3D modelling of seasonal evolution of Loire and Gironde plumes on Biscay Bay continental shelf
Provedor de dados: 5
Autores: Lazure, Pascal; Jegou, Anne-marie.
A 3D model of the Atlantic shelf has been developed and applied to study shelf dynamics and evolution of hydrology. The model takes the combined effects of tide, wind, river discharges and surface heat flux into account. Time scales vary from 1 day to several years. Following a brief description of the model and forcing variables, the behaviour of the Loire and Gironde plumes is described, first for winter and spring, then over a period of several years, under realistic forcing. The results show that plume evolution depends on the high Variability of river runoff and winds. Model simulations performed over 7 years (1990 to 1996) have highlighted several features of these plumes: 1) In early winter and periods of high river runoff, plumes usually spread...
Tipo: Text
Palavras-chave: Panache; Modélisation; Dynamique du plateau continental; Golfe de Gascogne; River plume; Modelling; Shelf dynamics; Bay of Biscay.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-847.pdf

Optimal Selectivity and Effort Cost A Simple Bioeconomic Model with an Application to the Bay of Biscay Nephrops Fishery
Provedor de dados: 5
Autores: Macher, Claire; Boncoeur, Jean.
This article investigates the relationship between optimal gear selectivity and effort cost in the fishing industry We first show that optimal selectivity depends negatively on the level of effort cost, but that this relationship is not continuous. Optimal selectivity switches when real effort cost goes beyond a certain level, and this switch induces a non-marginal reduction in the level of fishing effort. In the second part of this article, we shoot, that the current level of real effort cost in the Nephrops fishery of the Bay of Biscay is far below the switch point, which makes high selectivity optimal. The discrepancy between optimal and current selectivity may be explained by the state of the fishery management and also by the fact that selectivity is...
Tipo: Text
Palavras-chave: Selectivity; Effort; Technical measure; Management tradeoff; Nephrops fishery; Bay of Biscay; Bio-economic model; Social and private benefits and costs; Fuel costs.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00011/12232/9279.pdf

Using underwater video to assess megabenthic community vulnerability to trawling in the Grande Vasière (Bay of Biscay)
Provedor de dados: 5
Autores: Merillet, Laurene; Mouchet, Maud; Robert, Marianne; Salaun, Michele; Schuck, Lucie; Vaz, Sandrine; Kopp, Dorothee.
Trawling activities are considered to be one of the main sources of disturbance to the seabed worldwide. We aimed to disentangle the dominance of environmental variations and trawling intensity in order to explain the distribution of diversity patterns over 152 sampling sites in the French trawl fishing-ground, the Grande Vasière. Using a towed underwater video device, we identified 39 taxa to the finest taxonomic level possible, which were clustered according to their vulnerability to trawling disturbance based on functional traits. Using generalized linear models, we investigated whether the density distribution of each vulnerability group was sensitive to trawling intensity and habitat characteristics. Our analyses revealed a structuring effect of depth...
Tipo: Text
Palavras-chave: Bay of Biscay; Biodiversity; Bottom trawl; Fishing; Underwater video; Vulnerability.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00406/51741/52436.pdf

Satellite and in situ observations of a late winter phytoplankton bloom, in the northern Bay of Biscay
Provedor de dados: 5
Autores: Gohin, Francis; Lampert, Luis; Guillaud, Jean-francois; Herbland, Alain; Nezan, Elisabeth.
A phytoplankton bloom was observed in late winter 2000, on the continental shelf offshore of southern Brittany, in northwestern Bay of Biscay. This bloom appeared initially along the 120-m isobath, in stratified and clear waters, at the interface between the oceanic water and the plumes of southern Brittany rivers (mainly the Loire and Vilaine). The development of the bloom was triggered by favourable meteorological conditions, characterised by solar irradiance reaching the maximum level expected for that period of the year. Outside of the bloom area, the phytoplankton photosynthesis was irradiance limited: inshore, because of the stronger attenuation of the light; offshore, because of the weak stratification. The hydrological conditions at the onset of...
Tipo: Text
Palavras-chave: Bay of Biscay; Coscinodiscus; Algal bloom; Phytoplankton; Ocean colour; Satellite sensing.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-463.pdf

Characterising Essential Fish Habitat using spatio‐temporal analysis of fishery data: A case study of the European seabass spawning areas
Provedor de dados: 5
Autores: Dambrine, Chloe; Woillez, Mathieu; Huret, Martin; De Pontual, Helene.
Fish habitats sustain essential functions for fish to complete their life cycle, such as feeding, growing and spawning. Conservation is crucial to maintain fish populations and their exploitation. Since 2013, the spawning stock biomass of the northern stock of European seabass (Dicentrarchus labrax) has been in a worrying state. A series of low recruitments with a persistently high level of fishing has been blamed, raising concerns about the processes involved in seabass reproduction and settlement in nurseries. Here, we characterise seabass spawning areas along the French Atlantic coast using vessel monitoring system (VMS) data. A non‐linear geostatistical approach was applied, from 2008 to 2014, to detect locations where seabass aggregate for spawning....
Tipo: Text
Palavras-chave: Bay of Biscay; Bayesian spatio‐temporal modelling; Dicentrarchus labrax; English Channel; European sea bass; Non‐linear geostatistics; Spawning grounds.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00668/77997/80218.pdf

Observations of chondrichthyan fishes (sharks,rays and chimaeras) in the Bay of Biscay (North-eastern Atlantic) from submersibles.
Provedor de dados: 5
Autores: Lorance, Pascal; Latrouite, Daniel; Seret, Bernard.
Forty one manned submersible dives were carried out during 2 cruises in the Bay of Biscay covering a range of depth from about 100 to 2100 m. Chondrichthyan species were observed in most of the dives, some of them were easily identified and their behaviour could be studied. Twenty-two chondrichthyan species (9 sharks, 8 rays and 5 chimaeras) were recorded. Shark species were always seen active except Scyliorhinus canicula and Galeus melastomus. Some representatives were found motionless on the bottom, sometimes forming groups for the first species. Chimaeras appeared to strongly react to the presence of the submersible. The density of chondrichtyes and their relative frequency in the total fish assemblage were estimated, the results are globally consistent...
Tipo: Text
Palavras-chave: Submersible; Deep Sea; Bay of Biscay; ANE; Chondrichthyans.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/acte-2571.pdf

Variability in natural behaviour, and observed reactions to an ROV, by mid-slope fish species
Provedor de dados: 5
Autores: Lorance, Pascal; Trenkel, Verena.
The behaviour of eight large benthopelagic fish taxa was analysed using video records collected with an ROV on the mid-slope of the Bay of Biscay. The studied species were roundnose grenadier (Coryphaenoides rupestris), orange roughy (Hoplostethus atlanticus), deep-sea scorpionfish (Trachyscorpia cristulata echinata), and black scabbardfish (Aphanopus carbo), as well as individuals belonging to the families Alepocephalidae, Chimaeridae, and Scyliorhinidae, and to the order Squaliformes. Some of the observed fish were grouped at the family taxonomical level due to visual identification to species being unreliable. Assumed natural (undisturbed) behaviour was categorised in terms of (i) body position with respect to the bottom sea floor, (ii) locomotion and...
Tipo: Text
Palavras-chave: ROV; Life strategies; Fish; Diversity; Continental slope; Behaviour; Bay of Biscay.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1228.pdf

Effect of strong winds on the nutritional condition of anchovy (Engraulis encrasicolus L.) larvae in the Bay of Biscay, Northeast Atlantic, as inferred from an early field application of the DNA/C index
Provedor de dados: 5
Autores: Bergeron, Jean-pierre.
A new biochemical index was used to assess larval fish nutritional condition during a. survey cruise in the Bay of Biscay in early June 1993. This period corresponds to the breeding season of the European anchovy (Engraulis encrasicolus L.). The analysis of samples taken at grid points indicated a clear spatial pattern in nutritional condition, which increased from the middle shelf to the shelf edge. A relatively large fraction of the larval population proved to be in poor condition. Strong winds with speeds of 20-30 knots occurred during 3 d after the first survey and affected the vertical hydrological structure. During a subsequent survey, samples taken at approximately the same locations showed that anchovy larvae in all areas were in very poor...
Tipo: Text
Palavras-chave: Windstress; Nutritional condition; Fish larvae; European anchovy; DNA/C; Bay of Biscay.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/2000/publication-449.pdf

Change in the shoaling behaviour and nutritional condition of anchovies (Engraulis encrasicolus L.) during a wind-induced water column disturbance: a natural event test of a general hypothesis
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Masse, Jacques.
Fishermen have long observed the sudden change of shoaling behaviour of small pelagic fish following a strong wind event. The phenomenon was thereafter confirmed by fisheries scientists using acoustic tools. In this study, we report our observations made with acoustics to measure disorganization of the previously observed spatial distribution and shape of shoals that occurred after a wind event. The measurements were made during a fisheries research cruise in the Bay of Biscay (NE Atlantic) aimed at determining i) small pelagic fish species abundance and ii) the individual nutritional state of anchovies (Engraulis encrasicolus L.) via evaluation of their RNA/DNA ratio. A spatial fine-scale study was conducted in two of the main breeding areas for anchovy,...
Tipo: Text
Palavras-chave: Engraulis encrasicolus L.; Anchovy; Behaviour; Acoustics; Bay of Biscay; Nutritional condition; RNA/DNA ratio.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00033/14473/11782.pdf

Effect of an invasive mollusc, American slipper limpet Crepidula fornicata, on habitat suitability for juvenile common sole Solea solea in the Bay of Biscay
Provedor de dados: 5
Autores: Le Pape, Olivier; Guerault, Daniel; Desaunay, Yves.
This study describes the effect of an invasive mollusc, the slipper limpet Crepidula fornicata, on the distribution and abundance of young-of-the-year sole Solea solea in coastal nursery areas, based on beam-trawl surveys in the Bay of Biscay (France) over a 3 yr period (2000 to 2002). As habitat suitability for juvenile sole varies according to bathymetry and sediment structure, these factors and the density of the slipper limpet were used as descriptors in generalised linear models of habitat suitability to characterise the distribution of juvenile sole. The models were based on a delta distribution, coupling a binomial model testing for the presence of juvenile sole with a log-normal distribution for density when juveniles were known to be present....
Tipo: Text
Palavras-chave: Solea solea; Nursery ground; Habitat suitability models; Crepidula fornicata; Invasive species; Bay of Biscay.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10854/7579.pdf

The distribution of scleractinian corals in the Bay of Biscay, NE Atlantic
Provedor de dados: 5
Autores: Reveillaud, J; Freiwald, A; Van Rooij, D; Le Guilloux, Erwan; Altuna, A; Foubert, A; Vanreusel, A; Olu, Karine; Henriet, J.
Studies on the distribution of scleractinian corals in the Bay of Biscay were relatively numerous during the nineteenth and the first half of the twentieth century. Yet, recent reports are scattered, sometimes unpublished, and therefore knowledge about the current coral occurrence in the area is limited. This study aims at compiling the available historical and more recently collected information on the occurrence of scleractinian corals in the Bay of Biscay. Data from two recent cruises are included and compared with previous explored coral sites from as early as 1830 up to 1995. A database of 347 records including 34 described species of scleractinians highlights that the slope of the Bay of Biscay is an important habitat for scleractinians. This could...
Tipo: Text
Palavras-chave: Biodiversity; Bay of Biscay; Slope; Scleractinia; Cold water corals.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4503.pdf

Variation in life-history traits of European anchovy along a latitudinal gradient: a bioenergetics modelling approach
Provedor de dados: 5
Autores: Huret, Martin; Tsiaras, K; Daewel, U; Skogen, Md; Gatti, Paul; Petitgas, Pierre; Somarakis, S.
Anchovy Engraulis encrasicolus distribution in European waters spans from the Mediterranean Sea to the North Sea, and is expected to expand further north with global warming. Observations from the eastern Mediterranean (North Aegean Sea), the Bay of Biscay and the North Sea reveal latitudinal differences in growth, maximum size, fecundity and timing of reproduction. We set up a mechanistic framework combining a bioenergetics model with regional physical-biogeochemical models providing temperature and zooplankton biomass to investigate the underlying mechanisms of variation in these traits. The bioenergetics model, based on the Dynamic Energy Budget theory and initially calibrated in the Bay of Biscay, was used to simulate growth and reproduction patterns....
Tipo: Text
Palavras-chave: Engraulis encrasicolus; Countergradient variation; Growth; Reproduction; Dynamic Energy Budget theory; Bay of Biscay; Aegean Sea; North Sea.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00504/61564/65489.pdf

Grands invertébrés et poissons observés par les campagnes scientifiques. Bilan 2007
Provedor de dados: 5
Autores: Bertrand, Jacques; Brind'Amour, Anik; Cochard, Marie-laure; Coppin, Franck; Leaute, Jean-pierre; Lorance, Pascal; Mahe, Jean-claude; Morin, Jocelyne; Poulard, Jean-charles; Rochet, Marie-joelle; Schlaich, Ivan; Souplet, Arnauld; Trenkel, Verena; Verin, Yves.
The ecosystems exploited by fishing are complex. The species which are sought after and their distribution rely on numerous processes, in time and space. The understanding of marine ecosystems requires important means and diverse information including those of professional fishing and scientific cruises. At first, scientific fishing cruises aimed to explore marine fauna and discover new halieutic resources. They were in line with the exploration cruises carried out by Prince Albert 1st of Monaco at the end of the XIXth century. However, since the beginning of the 1970s, they have been focusing on the quantification of the resources exploited by fishing. [...] After a series of "Understanding keys" aimed at helping the reader understand the methodology and...
Tipo: Text
Palavras-chave: Mediterranean Sea; Bay of Biscay; English Channel; North Sea; France; Communities; Populations; Fishery science; Indicators; Bulletin; Méditerranée; Golfe de Gascogne; Manche; Mer du Nord; France; Pêche; Campagnes à la mer; Communautés; Populations; Halieutique; Indicateurs; Bulletin.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/rapport-6160.pdf

Essais de dispositifs sélectifs par les flottilles chalutières du golfe de Gascogne. Programme REDRESSE
Provedor de dados: 5
Autores: Mehault, Sonia; Larnaud, Pascal; Rimaud, Thomas; Cuillandre, Jean-pierre; Morandeau, Fabien; Simon, Julien; Vacherot, Jean-philippe.
The landing obligation implemented under the Common Fisheries Policy promoted the development of fishing gear selective devices. The REDRESSE project conducted in the Bay of Biscay was the opportunity for trawl fleets targeting cephalopods, Nephrops and demersal fish to continue to test various selective configurations to reduce their discards levels. The sea trials were carried out onboard of commercial fishing vessels and the experimental tows were sampled by an observer. Most of the selective devices were tested under the twin trawl method, with on one side the gear to be tested and on the other, the standard commercial gear. Other devices were tested with the parallel or alternate haul method. The data obtained were used to describe the catch species...
Tipo: Text
Palavras-chave: Pêcherie langoustinière; Pêcherie poisons/céphalopode; Grande Vasière; Golfe de Gascogne; Sélectivité; Chalut; Rejets; Nephrops fishery; Fish/cephalopods fishery; Grande Vasière; Bay of Biscay; Trawl selectivity; Discards.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00457/56847/58681.pdf

Modeling fish growth and reproduction in the context of the Dynamic Energy Budget theory to predict environmental impact on anchovy spawning duration
Provedor de dados: 5
Autores: Pecquerie, Laure; Petitgas, Pierre; Kooijman, Sebastiaan.
Spawning location and timing are critical for understanding fish larval survival. The impact of a changing environment on spawning patterns is, however, poorly understood. A novel approach is to consider the impact of the environment on individual life histories and subsequent spawnings. In the present work, we extend the Dynamic Energy Budget (DEB) theory to investigate how environment variability impacts the spawning timing and duration of a multiple-batch spawning species. The model is successfully applied to reproduce the growth and reproduction of anchovy (Engraulis encrasicolus) in the Bay of Biscay. The model captures realistically the start and ending of the spawning season, including the timing of the spawning events, and the change in egg number...
Tipo: Text
Palavras-chave: Bay of Biscay; Engraulis encrasicolus; Starvation; Environmental conditions; Condition factor; Multiple Batch Spawning; Reproductive Biology; DEB Theory.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6769.pdf

Role of the Nutritional Condition of Breeding Anchovies in the Subsequent Recruitment to their Population in the Bay of Biscay (NE Atlantic)
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Masse, Jacques.
The recruitment of marine fish populations is a central concern of fisheries scientists. Multiple research pathways have been explored, with emphasis of the causes of mortality affecting principally the early developmental stages of fish life. The small data set presented focuses on a feature often inadequately considered, i.e., the nutritional condition of the breeding parent fishes estimated from the levels of the RNA/DNA ratio determined in fish white muscle. This is applied to the European anchovy population inhabiting the French continental shelf of the North-east Atlantic Ocean. In four of the five years analysed, the annual recruitment shows a tight relationship with the mean values for the RNA/DNA ratio determined in the parent fish during the...
Tipo: Text
Palavras-chave: Anchovy; Bay of Biscay; Breeding season; Recruitment; RNA/DNA ratio.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00109/22025/19684.pdf

Programme d Orientation Pluriannuel concernant une action commune de restructuration, de modernisation et de développement du secteur de la peche
Provedor de dados: 5
Autores: Minet, Jean-pierre; Biseau, Alain; Charuau, Anatole; Dupouy, Herve; Durand, Jean-louis; Perodou, Jean-bernard.
Answering a need of the Office of Regional Marine Affairs of Brittany, the "fisheries" laboratory of the Ifremer in Lorient provides synthesis elements about the status of the stocks of the main species exploited in the Bay of Biscay, Celtic Sea and Western Ireland in 1983. It provides information about the fishing capacity according to the different jobs done and compares two fleets from South-Brittany: Lorient and Concarneau. This report will have to be completed by the laboratories of Roscoff for activities in North-Brittany and of la Rochelle for activities in the Bay of Biscay.
Tipo: Text
Palavras-chave: Fishing fleet; Concarneau; Lorient; Fishing resources; West Ireland; Celtic Sea; Bay of Biscay; Brittany; Fishing; Flottille de pêche; Concarneau; Lorient; Ressource de pêche; Ouest Irlande; Mer Celtique; Golfe de Gascogne; Bretagne; Pêche.
Ano: 1984
URL: http://archimer.ifremer.fr/doc/1984/rapport-3635.pdf

Functional gains of including non-commercial epibenthic taxa in coastal beam trawl surveys: A note
Provedor de dados: 5
Autores: Brind'Amour, Anik; Rouyer, Armelle; Martin, Jocelyne.
The development of ecosystem-based indicators requires the broadening of a view of the community, from fish species to all the species (macrobenthic and fish) correctly captured by a given sampling gear. Many scientific surveys already have such integrated databases. The present note aims to demonstrate that existing databases, herein from dedicated coastal nursery surveys, are actually underexploited. Such databases contain information on non-commercial taxa, which could greatly improve our knowledge on the organisation and functioning of coastal ecosystems. Using two datasets, a "complete" dataset composed of commercial and not-commercial epibenthic trawled species (fish and invertebrate) and a "subset" dataset characterized by commercial and routinely...
Tipo: Text
Palavras-chave: Nursery grounds; Functional diversity; Fish community; Coastal surveys; Beam trawl; Bay of Biscay.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6507.pdf

Palaeoceanographic and palaeoclimatic changes during the last 37,000 years detected in the SE Bay of Biscay based on benthic foraminifera
Provedor de dados: 5
Autores: Pascual, A.; Rodríguez-lázaro, J.; Martínez-garcía, B.; Varela, Z.
Benthic foraminifera assemblages from a sedimentary core (PP10-12; 701 mwd) from the SE Bay of Biscay allow us to trace palaeoceanographic and palaeoclimatic changes occurred in this region during mid MIS 3 (Marine Isotope Stage 3) and MIS 1 interval (37–2.4 ka BP). Results are based on 176 benthic foraminifera species considering their ecology, the difference between autochthonous/allochthonous, preservation and oxygen rates, thus evidencing climatic and oceanographic events. MIS 3 is characterised by waters with a dominance of Cassidulina laevigata and Uvigerina peregrina. By the end of this interval, waters became colder and less oxygenated indicated by the occurrence of Melonis affinis. These conditions persisted at the beginning of MIS 2. The Heinrich...
Tipo: Text
Palavras-chave: Palaeoclimatology; Palaeoceanography; Benthic foraminifera; MIS 3-MIS 1; Bay of Biscay.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00627/73910/73242.pdf

Facteurs de mortalité observés chez les tortues marines dans le golfe de Gascogne
Provedor de dados: 5
Autores: Duguy, R; Moriniere, P; Le Milinaire, C.
Factors of mortality in marine turtles near the French coast of the Bay of Biscay have been recorded for four species: leatherback (Dermochelys coriacea), loggerhead (Caretta caretta), Ridley's turtle (Lepidochelys kempii) and green turtle (Chelonia mydas). Most accidental captures of D. coriacea by fishing gears lead to drowning, but the main threat for the species is the ingestion of floating waste. Plastic bags induce occlusion or lesions in the stomach and subsequent death. For C. caretta, L. kempii and C. mydas, the pathology points out mainly two features: external or internal mycosis.
Tipo: Text
Palavras-chave: Chélonien; Tortue marine; Pathologie; Pollution; Golfe de Gascogne; Chelonian; Marine turtle; Pathology; Pollution; Bay of Biscay.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43693/43236.pdf

Effets combinés des facteurs naturels et anthropiques sur les communautés d'invertébrés benthiques des vasières à langoustines (Nephrops Norvegicus) du golfe de Gascogne
Provedor de dados: 5
Autores: Robert, Alexandre.
Bottom trawling is a widespread fishing activity that covers most of the North-European continental shelves. This activity is likely to alter the benthic habitats, the structure and biodiversity of benthic communities as well as the ecosystem functioning. However, bottom trawling effects vary according to the habitats and, specifically according to the magnitude of the natural sources of disruptions. Consequently, it is difficult to predict the effects of the fishing activity. So, a specific investigation has to be conducted in each fishery in order to characterize the effect of bottom trawling. The Bay of Biscay (BoB) is fished for Norway lobsters and hake. Bottom trawling is one of the most important fishing activities, both economically and regarding to...
Tipo: Text
Palavras-chave: Écologie benthique; Perturbations anthropiques; Biodiversité et fonctionnement des écosystèmes; Golfe de Gascogne; Pennatule et à mégafaune fouisseuse; Benthic ecology; Anthropogenic disruptions; Biodiversity and ecosystem functioning; Bay of Biscay; Seapens and burrowing megafauna.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00611/72341/71226.pdf

Determining how the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic) functions: An approach using mesozooplankton enzyme activities as descriptors
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Delmas, Daniel; Koueta, Noussithe.
A fisheries research cruise conducted in 2000 offered a first opportunity to take simultaneous measurements of the activities of three enzymes in mesozooplankton samples collected at a regional scale over the continental shelf of the Bay of Biscay in the NE Atlantic, with the aim of characterizing main aspects of the functioning of the biotic environment of small pelagic fish populations. The activity of the digestive endopeptidase trypsin was selected to characterize the assimilation rate of proteins, whereas pyruvate kinase (PK) was chosen as an indicator of carbohydrate assimilation and aspartate transcarbamylase (ATC) provided an overall assessment of mesozooplankton productivity. The Bay of Biscay region is subject to various strong physical driving...
Tipo: Text
Palavras-chave: Trypsin; Pyruvate kinase; Metabolic descriptors; Mesozooplankton; Bay of Biscay; Aspartate transcarbamylase.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6359.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

The boundary circulation along the European continental slope as transport vehicle for two calanid copepods in the Bay of Biscay
Provedor de dados: 5
Autores: John, Hc; Mittelstaedt, E; Schulz, K.
The copepod fauna south-west of the British Isles includes a number of species which have their centre of distribution in the subtropical or tropical Atlantic. Among these, some species appear to be faunistically linked with the Iberian continental slope or slope waters even farther south along the NE Atlantic margin. It seems that these species reach their north-eastern range by means of poleward-flowing currents. For example, Calanoides carinatus has deep-living resting stages and ascends to surface waters only during its reproductive period, which is short at northern latitudes. Its main dwelling layers along the west Iberian continental slope cover the poleward-flowing undercurrent and the Mediterranean outflow water underneath. Part of the poleward...
Tipo: Text
Palavras-chave: Golfe de Gascogne; Courant de pente; Eau méditerranéenne; Minimum de salinité; Transport de copépode; Bay of Biscay; Continental slope current; Mediterranean water; Salinity minimum; Copepod transport.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43688/43121.pdf

Flux dynamics of planktic foraminiferal tests in the south-eastern Bay of Biscay (northeast Atlantic margin)
Provedor de dados: 5
Autores: Kuhnt, Tanja; Howa, Helene; Schmidt, Sabine; Marie, Louis; Schiebel, Ralf.
The temporal and water depth related dynamics of planktic foraminiferal fluxes in the south-eastern Bay of Biscay are discussed for a two year sampling period (June 2006-June 2008). Two sediment traps deployed at 800 m and 1700 m water depth at a mooring in 2000 m of water depth, were analyzed for the flux of planktic foraminiferal species &gt;150 mu m, in comparison with the total mass flux. Total flux of planktic foraminifera shows seasonal maxima in spring/early summer (&gt;2000 Ind.m(-2) d(-1)) and minima from late summer through winter (&lt;10 Ind.m(-2) d(-1)). The flux of planktic foraminiferal tests in the intermediate to deep water column at the inner Bay of Biscay comprises an intermittent and regionally variable signal of seasonal surface water...
Tipo: Text
Palavras-chave: Planktic foraminifera; Bay of Biscay; Sediment traps; Particulate mass flux; Pb-210; Seasonality; Lateral advection.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00125/23593/21785.pdf

Seasonal and inter-annual variability in properties of surface water off Santander, Bay of Biscay, 1991-1995
Provedor de dados: 5
Autores: Lavin, A; Valdes, L; Gil, J; Moral, M.
The annual cycle of temperature, salinity and nutrients of surface waters (up to 100 m depth) was studied from June 1991 to December 1995 in a cross-shelf section over the continental shelf waters off Santander (southern Bay of Biscay). The time series showed that the temperature followed the expected seasonal warming and cooling pattern, which determines a seasonal process of stratification and mixing of the water column. The stratification period occurs annually between May and October in a layer of about 50 m depth from the neritic station beyond to the shelf-break. In the period between November and April the water column remained mixed. During spring and summer low salinity values were found in the surface due to continental runoff and advection from...
Tipo: Text
Palavras-chave: Golfe de Gascogne; Hydrologie; Eau superficielle; Série chronologique; Bay of Biscay; Hydrographical conditions; Surface water; Time series.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43678/43194.pdf

Spring habitats of small pelagic fish communities in the Bay of Biscay
Provedor de dados: 5
Autores: Doray, Mathieu; Hervy, Camille; Huret, Martin; Petitgas, Pierre.
Mapping habitats of species communities helps to inform on the ecological processes which drive their distribution. This information is critical to identify suitable areas for spatial management, aimed at preserving biodiversity, ecosystem functions or essential habitats. While demersal fish have been extensively studied at the community scale, small pelagic fish have mainly been characterised at the population scale. This paper presents a community-based approach on the biodiversity of small pelagic fish, with the aim to: (i) define small pelagic fish communities, (ii) characterise their spatial and interannual dynamics, and (iii) assess their habitats. We present a Multiple Factor Analysis (MFA)-based method that characterises the spatio-temporal...
Tipo: Text
Palavras-chave: Habitat; Small pelagic fish; Bay of Biscay; Spatial distribution; Multiple Factor Analysis.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00411/52236/53046.pdf

Seasonal evolution of the nutrient pattern on Biscay Bay continental shelf over the years 1999-2000
Provedor de dados: 5
Autores: Loyer, Sophie; Lampert, Luis; Menesguen, Alain; Cann, Philippe; Labasque, Thierry.
The French Atlantic shelf is Subjected to strong anthropic influences (urban, industrial and agricultural discharges) of two main rivers (Loire and Gironde). The extension and consequences of these continental loadings for the nutrient and chlorophyll distribution have never been studied before oil the Bay of Biscay continental shelf as a whole. We present the first synoptic view of the nutrient distribution and evolution oil the French Atlantic shelf. Nutrient concentrations of the surface layer were Studied during four cruises in April, June, September 1999 and March 2000. Until June, the freshwater inputs induce a nitrate gradient from river months to offshore waters in the vicinity of the 100 m isobath. The Redfield's ratio Study highlights the nitrate...
Tipo: Text
Palavras-chave: Nutrients; River inputs; Coastal water; Bay of Biscay.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3956.pdf

Optimizing observational networks combining gliders, moored buoys and FerryBox in the Bay of Biscay and English Channel
Provedor de dados: 5
Autores: Charria, Guillaume; Lamouroux, Julien; De Mey, Pierre.
Designing optimal observation networks in coastal oceans remains one of the major challenges towards the implementation of future efficient Integrated Ocean Observing Systems to monitor the coastal environment. In the Bay of Biscay and the English Channel, the diversity of involved processes (e.g. tidally-driven circulation, plume dynamics) requires to adapt observing systems to the specific targeted environments. Also important is the requirement for those systems to sustain coastal applications. Two observational network design experiments have been implemented for the spring season in two regions: the Loire River plume (northern part of the Bay of Biscay) and the Western English Channel. The method used to perform these experiments is based on the ArM...
Tipo: Text
Palavras-chave: Design of in situ observation network; Bay of Biscay; English Channel; Glider; FerryBox.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00324/43545/43102.pdf

Dynamique du phosphore et rôle comme facteur limitant de la production planctonique dans le panache de la Gironde sur le plateau continental Sud Gascogne
Provedor de dados: 5
Autores: Labry, Claire.
This study was supported by the Atlantic working site of the « Programme National d’Océanographie Côtière » (PNOC, PNEC since 1999). The objectives were (1) to check the existence and to understand the mechanisms of winter phytoplankton blooms in the bay of Biscay influenced by the Gironde waters (2) to determine the limiting nutrient of the primary production associated to these blooms and to follow the seasonal evolution of the limiting nutrient, (3) to understand the consequences of this early limitation on the structuration of algal populations in spring. Since phosphorus was supposed to be the major limiting nutrient of algal growth in the Gironde plume, the different forms of the phosphorus cycle as well as the bacterial compartment, central in this...
Tipo: Text
Palavras-chave: Golfe de Gascogne; Gironde; Phytoplancton; Bactéries; Phosphates; Phosphore organique; Dissous; Phosphatases; Bay of Biscay; Gironde; Phytoplankton; Bacteria; Phosphate; Dissolved organic phosphorus; Phosphatases.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00013/12463/9298.pdf

Observations ichtyologiques effectuées en 2002
Provedor de dados: 5
Autores: Quero, Jean-claude; Spitz, J; Vayne, Jean-jacques.
During 2002, along the French coasts, three living specimens of Regalecus glesne are recorded, one of them at Cap Ferret, first record in the Bay of Biscay, two others in the Mediterranean sea between Marseille and Cassis. Among the trawl catches in the Bay of Biscay by N/O "Thalassa", we have observed two specimens of Chlorophthalmus agassizi, one of Callionymus reticulatus recorded for the first time along the Poitou-Charentes coasts, four of Mentodus rostratus and one of Photostylus pycnoptcrus. NOT CONTROLLED OCR
Tipo: Text
Palavras-chave: Poitou Charentes coasts; Bay of Biscay; Photostylus pycnopterus; Mentodus rostratus; Callionymus reticulatus; Chlorophthalmus agassizi; Regalecus glesne; First record; Côtes de Poitou Charentes; Golfe de Gascogne; Photostylus pycnopterus; Mentodus rostratus; Callionymus reticulatus; Chlorophthalmus agassizi; Regalecus glesne; 1er signalement.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/publication-3659.pdf

Observations ichtyologiques effectuées en 2001
Provedor de dados: 5
Autores: Quero, Jean-claude; Spitz, J; Vayne, Jean-jacques.
One species, fished in 1999 in the Bay of Biscay, determinated during 2001 according to two photographs, Aristostomias tittmanni, is recorded for the first time in the European Atlantic. Six other species, five fished with a pelagic trawl, Bathylagichthys greyae, Melanostomias bartonbeani, Macroparalepis affinis, Lobianchia gemellarii and Melanonus zugmayeri, one fished with a bottom trawl Ophidion barbatum, were recorded for the first time in tbe Bay of Biscay. The pelagic ichtyological fauna about -500 m, -1000m and -1500 m depth has changed between 1966 to 1968 and 2001 with a decrease of temperate cold affinities species, mostly Benthosema glaciale, and an increase of temperate warm affinities species, mostly Ceratoscopelus maderensis. NOT CONTROLLED OCR
Tipo: Text
Palavras-chave: Mesopelagic ichthyological fauna; Changes; Bay of Biscay; Ophidion barbatum; Melanonus zugmayeri; Lobianchia gemellarii; Macroparalepis affinis; Melanostomias bartonbeani; Bathylagichthys greyae; European Atlantic; Aristostomias tittmanni; First record; Faune ichtyologique mésopélagique; Modifications; Golfe de Gascogne; Ophidion barbatum; Melanonus zugmayeri; Lobianchia gemellarii; Macroparalepis affinis; Melanostomias bartonbeani; Bathylagichthys greyae; Atlantique européen; Aristostomias tittmanni; 1er signalement.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-3651.pdf

Environmental setting of deep-water oysters in the Bay of Biscay
Provedor de dados: 5
Autores: Van Rooij, David; De Mol, L.; Le Guilloux, Erwan; Wisshak, M.; Huvenne, V. A. I.; Moeremans, R.; Henriet, Jean-pierre.
We report the northernmost and deepest known occurrence of deep-water pycnodontine oysters based on two surveys along the French Atlantic continental margin to the La Chapelle continental slope (2006) and the Guilvinec Canyon (2008) The combined use of multibeam bathymetry seismic profiling CTD casts and a remotely operated vehicle (ROV) made it possible to describe the physical habitat and to assess the oceanographic control for the recently described species Neopycnodonte zibrowii These oysters have been observed in vivo in depths from 540 to 846 m colonizing overhanging banks or escarpments protruding from steep canyon flanks Especially in the Bay of Biscay such physical habitats may only be observed within canyons where they are created by both...
Tipo: Text
Palavras-chave: Bay of Biscay; Deep water oysters; Canyons; Habitat; Resuspension; MOW; Neopycnodonte zibrowii.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00023/13419/14034.pdf

Some expected impacts of the Common Fishery Policy on marine food webs
Provedor de dados: 5
Autores: Kopp, Dorothee; Robert, Marianne; Chouvelon, Tiphaine; Mehault, Sonia.
For the ecosystem approach to fisheries management, understanding population dynamics and ecosystem resilience in response to the landing obligation acted by the reform of the European Common Fishery Policy (CFP) is currently an important avenue of research. This study attempts to assess the impact of the new CFP on marine food webs. Total carbon and nitrogen loss induced by a discard ban were estimated for the ecosystem of the Bay of Biscay based on French At-Sea Observer data and carbon and nitrogen content of discarded fish. Changes in predator diets were estimated by comparing two Bayesian mixing models, one mimicking the current situation and the second the application of the new CFP (removing the discarded species that would be landed from the...
Tipo: Text
Palavras-chave: Fishery discards; Discard ban; Bay of Biscay; Organic input; Resource use.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00308/41895/41229.pdf

Variability of energy density among mesozooplankton community: new insights in functional diversity to forage fish
Provedor de dados: 5
Autores: Dessier, Aurelie; Dupuy, Christine; Kerric, Anais; Mornet, Francoise; Authier, Matthieu; Bustamante, Paco; Spitz, Jerome.
To explore some aspects of mesozooplankton functional diversity, this study quantified energy density during the springtime in the Bay of Biscay both between different species and between different size-classes. Energy densities of copepod species (Centropages typicus, Anomalocera patersoni, Calanus helgolandicus, and Labidocera wollastoni), as well as anchovy eggs (Engraulis encrasicolus) ranged from 0.5 to 6.7 kJ/g wet weight (ww). Considering size-classes, energy densities varied from 0.74 to 1.26 kJ/g ww. Energy density of C. helgolandicus exhibited a spatial pattern with the highest values in the plume of the Gironde estuary. In contrast, no spatial pattern of energy density has been detected considering size-classes. Our results showed that the...
Tipo: Text
Palavras-chave: Bay of Biscay; Profitability; Copepods; Prey-predator relationship; Fisheries.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00407/51835/52434.pdf

Utilisation de l'écho-intégration en recherche halieutique (Analyse de 5 campagnes effectuées dans le Golfe de Gascogne de 1983 à 1987)
Provedor de dados: 5
Autores: Masse, Jacques.
Afler a short review of acoustic principles, methodology and purposes of accustic surveys are described and some examples given. IFREMER instrumentation, strategy and calculations used during echo sur veys are  described in details and criticized. Five acouslic sur veys carried o t in the Bay of Biscay between 1983 and 1987 show that several species are generally mixed , and lheir identification is very oflen biased by behaviour phenomena. A new way of classi fying echotraces and interpretating data has been applied to these surveys. The results are summarized in tables and maps. Whenever multispecies structures are concerned, it seems at present impossible to assess absolute biomasses based on acoustic survey method. ln such a situation, acoustic surveys...
Tipo: Text
Palavras-chave: Echo-intégration; Golfe de Gascogne; Petits pélagiques; Comportement; Evaluation; Acoutic; Surveys; Bay of Biscay; Pelagic fishes; Behaviour; Assessment.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00455/56654/58395.pdf

Interannual fluctuations in spring pelagic ecosystem productivity in the Bay of Biscay (northeast Atlantic) measured by mesozooplankton aspartate transcarbamylase activity and relationships with anchovy population dynamics
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Koueta, Noussithe; Masse, Jacques.
The French part of the continental shelf of the Bay of Biscay (northeast Atlantic) is the habitat of an anchovy (Engraulis encrasicolus L.) population of scientific interest because of its economic importance and the trend towards greater interannual fluctuations in its abundance, particularly as a consequence of variations in recruitment. Each year a 1-month survey of this population and its pelagic environment is undertaken. Among the descriptors of ecosystem function characterized, mesozooplankton aspartate transcarbamylase (ATC) activity is measured with the goal of defining overall productivity of the mesozooplankton communities. Diverse physical forcing factors are responsible for the enhancement of productivity in the Bay of Biscay, and their...
Tipo: Text
Palavras-chave: Aspartate transcarbamylase; Anchovy biomass; Breeding season; Mesozooplankton; Pelagic fisheries; Bay of Biscay.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00128/23889/21849.pdf

Diversité phénotypique dans la population d’anchois commun (Engraulis encrasicolus) du golfe de Gascogne
Provedor de dados: 5
Autores: Leseur, Floriane.
With the constant rising of the human population, it is essential to assess and manage the exploitation of the marine species for human consumption such as the anchovy of Bay of Biscay. Thanks to the PELGAS annual surveys, stocks of each species are estimated (biomass, repartition) and studies are undertaken to improve our knowledge about these species. Allozymic studies realized on the anchovy allowed to find a correlation between 2 alleles of the locus IDH and the habitat (depth). This allozyme has a key role in Krebs’ cycle,being speed limiting.. It enables to tolerate variations of temperature and dissolved oxygen. It would be interesting to do new research on variations in the anchovy’s environment and its migrations.
Tipo: Text
Palavras-chave: Anchois; Golfe de Gascogne; Allozyme; Locus; Allèle; Adaptation; Anchovy; Bay of Biscay; Allozyme; Locus; Allele; Adaptation.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00342/45336/44798.pdf

Satellite-derived parameters for biological modelling in coastal waters: Illustration over the eastern continental shelf of the Bay of Biscay
Provedor de dados: 5
Autores: Gohin, Francis; Loyer, S; Lunven, Michel; Labry, Claire; Froidefond, J; Delmas, Daniel; Huret, Martin; Herbland, Alain.
In biological modelling of the coastal phytoplankton dynamics, the light attenuation coefficient is often expressed as a function of the concentrations of chlorophyll and mineral suspended particulate matter (SPM). In order to estimate the relationship between these parameters over the continental shelf of the northern Bay of Biscay, a set of in situ data has been gathered for the period 1998-2003 when SeaWiFS imagery is available. These data comprise surface measurements of the concentrations of total SPM, chlorophyll, and irradiance profiles from which is derived the attenuation coefficient of the photosynthetically available radiation, K-PAR. The performance of the IFREMER look-up table used to retrieve the chlorophyll concentration from the SeaWiFS...
Tipo: Text
Palavras-chave: Bay of Biscay; SeaWiFS; Sediment; Chlorophyll; Ocean color.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-1172.pdf

Étude par acoustique large bande de la composition et de la distribution spatiale de couches diffusantes denses dans le golfe de Gascogne
Provedor de dados: 5
Autores: Blanluet, Arthur.
Intermediate trophic components of pelagic ecosystem (from mesozooplakton to micronekton) funnel energy and organic matters from primary producers to many commercial species (anchovy, sardines…). Some of these organisms are supposed to be important contributors to the ubiquitous Sound Scattering Layers (SSLs) observed over a broad range of spatio-temporal scales and geographical areas. Yet, the SSLs taxonomic composition remains largely unknown. The aim of this PhD was to describe the composition and repartition of dense SSLs observed in the Bay of Biscay (France) in spring at several spatial scales, using broadband acoustics, nets and videos. In the first chapter, we showed that the echo sounder beam widths had few effect on the SSLs backscatter,...
Tipo: Text
Palavras-chave: Acoustique large bande; Couches diffusantes; Siphonophores; Imagerie du zooplancton; Golfe de Gascogne; Broadband acoustic; Sound scattering layers; Siphonophores; Zooplankton imagery; Bay of Biscay.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00497/60865/64201.pdf

Déclin de la taille-aux-âges des sardines (Sardina pilchardus) : diminution de la croissance et/ou disparition sélective des individus à croissance rapide
Provedor de dados: 5
Autores: Gentil, Claire.
In many exploited species, we see a decrease of size-at-ages. Two main hypotheses have been proposed to explain this decline: a decline in growth and the selective mortality of the individuals with fast growth both being due to environmental changes or/and to fishing. The sardine Sardina pilchardus of the Bay of Biscay is a good model for the study of this phenomenon because of its high sensitivity to the environmental variations and it sustains two large French and Spanish fisheries. The aim of this study is to measure the changes in the growth of sardines, by the reading of otoliths, and to understand mechanisms involved in this process. The main stages of this study are described in this report: extraction of otoliths during PELGAS, otoliths...
Tipo: Text
Palavras-chave: Sardina pilchardus; Golfe de Gascogne; Otolithes; Croissance; Mortalité; Sélection; Sardina pilchardus; Bay of Biscay; Otoliths; Growth; Mortality; Selection.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00459/57038/58942.pdf

Do survey design and wind conditions influence survey indices ?
Provedor de dados: 5
Autores: Poulard, Jean-charles; Trenkel, Verena.
Survey indices play an important role in stock assessments as they provide information on stock trends. In certain cases large interannual variations have been observed which are unlikely to reflect true underlying stock changes but are rather outliers. When survey indices for several species appear to be outliers for the same year, the suspicion is raised that something happened during the survey of that year. This is called a year-effect in survey catches. To study the potential year-effect in survey catches for the French autumn groundfish survey taking place in the Bay of Biscay, several indicators for survey design and wind conditions were derived as explanatory variables and Principal Component Analysis was used to study the relationship between...
Tipo: Text
Palavras-chave: Bay of Biscay; Survey conditions; Time trends; Catchability; Survey index.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2690.pdf

Histopathological assessment of liver and gonad pathology in continental slope fish from the northeast Atlantic Ocean
Provedor de dados: 5
Autores: Feist, S. W.; Stentiford, G. D.; Kent, Maxxie; Ribeiro Santos, Ana; Lorance, Pascal.
The deep-sea environment is a sink for a wide variety of contaminants including heavy metals and organic compounds of anthropogenic origin. Life history traits of many deep-water fish species including longevity and high trophic position may predispose them to contaminant exposure and subsequent induction of pathological changes, including tumour formation. The lack of evidence for this hypothesis prompted this investigation in order to provide data on the presence of pathological changes in the liver and gonads of several deep-water fish species. Fish were obtained from the north east region of the Bay of Biscay (north east Atlantic Ocean) by trawling at depths between 700 to 1400m. Liver and gonad samples were collected on board ship and fixed for...
Tipo: Text
Palavras-chave: Histopathology; Disease; Bay of Biscay; Neoplasia; Ovotestis; Deep-sea fish.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00252/36370/34910.pdf

Monitoring small pelagic fish in the Bay of Biscay ecosystem, using indicators from an integrated survey
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Huret, Martin; Duhamel, Erwan; Romagnan, Jean-baptiste; Authier, Matthieu; Dupuy, Christine; Spitz, Jerome.
This paper is a practical contribution to two important debates raised by the implementation of marine ecosystem based management: (i) which ecosystem data can be provided by a fisheries survey optimised for ecosystem monitoring; and (ii) how to combine/select potential indicators to derive useful information on marine ecosystem status and dynamics? A suite of 143 potential indicators, including spatial indices, representing small pelagic fish and their biotic and abiotic environments are presented. Indicators were routinely derived from the PELGAS integrated ecosystem survey conducted in spring in the Bay of Biscay (BoB). The general patterns over time in this suite of 5–16 years, non-stationary time series are characterised using a methodology based on...
Tipo: Text
Palavras-chave: Min/max autocorrelation factors; Time correlation; Survey-based indicators; Marine Strategy Framework Directive; Ecosystem variability; Bay of Biscay; Pelagic ecosystem.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00414/52552/53443.pdf

Activity of the turbidite levees of the Celtic-Armorican margin (Bay of Biscay) during the last 30,000 years: Imprints of the last European deglaciation and Heinrich events
Provedor de dados: 5
Autores: Toucanne, Samuel; Zaragosi, S; Bourillet, Jean-francois; Naughton, F; Cremer, M; Eynaud, F; Dennielou, Bernard.
High-resolution sedimentological and micropaleontological studies of several deep-sea cores retrieved from the levees of the Celtic and Armorican turbidite systems (Bay of Biscay - North Atlantic Ocean) allow the detection of the major oscillations of the British-Irish Ice Sheet (BIIS) and 'Fleuve Manche' palaeoriver discharges over the last 30,000 years, which were mainly triggered by climate changes. Between 30 and 20 cal ka, the turbiditic activity on the Celtic-Annorican margin was weak, contrasting with previous stratigraphic models which predicted a substantial increase of sediment supply during low sea-level stands. This low turbidite deposit frequency was most likely the result of a weak activity of the 'Fleuve Manche' palaeoriver and/or of a...
Tipo: Text
Palavras-chave: Turbidites; Heinrich events; LGM; Last deglaciation; Palaeoriver; Fleuve Manche; British irish ice sheet; Bay of Biscay.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3729.pdf

ROMELIGO. Amélioration des connaissances halieutiques du ROuget-barbet, du MErlan et du LIeu jaune du GOlfe de Gascogne
Provedor de dados: 5
Autores: Leaute, Jean-pierre; Caill-milly, Nathalie; Lissardy, Muriel; Bru, Noelle; Dutertre, Marie-adele; Saguet, Cassandre.
The stocks of whiting (Merlangius merlangus), pollack (Pollachius pollachius) and striped red mullet (Mullus surmuletus), are considered by ICES as Data Limited Stocks (DLS) for the Bay of Biscay areas, those bordering the Iberian Peninsula as well as the Celtic Sea for red mullet. In the case of insufficient data for an analytical assessment, ICES has recommended, for 2013 and 2014, to precautionarily reduce landings by 20 % compared to the period 2009-2011 for these 3 stocks. In order to improve knowledge to fill the gaps in the status of these stocks, and to extract them from the DLS category, the ROMELIGO project has: i) analyzed available data on both catches and professional fishing activity, Captures per Unit of Effort (CPUE) to identify reference...
Tipo: Text
Palavras-chave: Merlan; Lieu jaune; Rouget barbet de roche; Golfe de Gascogne; CPUE; Flottille de pêche; Paramètres biologiques; Whiting; Pollack; Striped red mullet; Bay of Biscay; CPUE; Fishing fleet; Biological parameters.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00440/55126/56584.pdf

Morphospecies and taxonomic sufficiency of benthic megafauna in scientific bottom trawl surveys
Provedor de dados: 5
Autores: Brind'Amour, Anik; Laffargue, Pascal; Morin, Jocelyne; Vaz, Sandrine; Foveau, Aurelie; Le Bris, Herve.
Scientific fisheries surveys routinely identify a large diversity of commercial and non-commercial benthic megainvertebrates that could provide useful information for Marine Strategy Framework Directive (MSFD) descriptors. Species is obviously the basic taxonomic level to which most ecological studies and theories refer. Identification at this level of organization is indeed always preferred over any other taxonomic level. Nevertheless, aggregation of species to higher taxonomic levels may be unavoidable sometimes, since errors of identification are known or suspected to occur in many surveys. Using analyses of taxonomic sufficiency (identification of organisms at various taxonomic resolutions) and groups of morphospecies (taxa identified easily by...
Tipo: Text
Palavras-chave: Bay of Biscay; English Channel; North Sea; Taxonomic sufficiency; Benthic descriptor; Bottom trawl surveys.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00162/27309/25538.pdf

Observations sur la croissance du tourteau Cancer pagurus en Manche et en golfe de Gascogne
Provedor de dados: 5
Autores: Latrouite, Daniel; Morizur, Yvon.
La production française de tourteaux provient pour l'essentiel des captures réalisées en Manche et dans le Golfe de Gascogne ; l'appréhension des caractéristiques de croissance pour cette ressource est une contribution nécessaire à l'aménagement de l'exploitation des pêcheries concernées. Des expériences de marquage-recapture effectuées de 1981 à 1984 sur les populations des deux bassins permettent une approche de la croissance de Cancer pagurus pour les deux zones concernées.
Tipo: Text
Palavras-chave: Molt frequency; Increment; Edible crab; Growth; Aquiculture; Bay of Biscay; Channel; Cancer pagurus; Fréquence de mue; Accroissement; Croissance; Cancer pagurus; Tourteau.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/acte-1417.pdf

Changes in occurrence and abundance of northern/southern flatfishes over a 20-year period in a coastal nursery area (Bay of Vilaine) and on the eastern continental shelf of the Bay of Biscay
Provedor de dados: 5
Autores: Desaunay, Yves; Guerault, Daniel; Le Pape, Olivier; Poulard, Jean-charles.
Several works have demonstrated trends in the distribution of fish species relative to global warming. This study investigated whether similar trends have occurred for selected flatfish species on the continental shelf of the Bay of Biscay. These species were used as indicators and changes in their Populations were studied in a coastal nursery ground,where flatfish juveniles are concentrated as well as on the entire shelf. Previous studies analysing changes in sea surface temperature for the continental shelf indicate that winter warming occurred in the 1980s and 1990s. Sixteen autumn cruises conducted since 1981 in the Bay of Vilaine nursery area and I I autumn cruises since 1987 over the entire shelf provided data on a nearly annual basis for the...
Tipo: Text
Palavras-chave: Bay of Biscay; Ocean warming; Spatial distribution; Flatfish.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3962.pdf

Modelling potential spawning habitat of sardine (Sardina pilchardus) and anchovy (Engraulis encrasicolus) in the Bay of Biscay
Provedor de dados: 5
Autores: Planque, Benjamin; Bellier, Edwige; Lazure, Pascal.
Large amplitude variations in recruitment of small pelagic fish result from interactions between a fluctuating environment and population dynamics processes such as spawning. The spatial extent and location of spawning, which is critical to the fate of eggs and larvae, can vary strongly from year to year, as a result of changing population structure and environmental conditions. Spawning habitat can be divided into 'potential spawning habitat', defined as habitat where the hydrographic conditions are suitable for spawning, 'realized spawning habitat', defined as habitat where spawning actually occurs, and 'successful spawning habitat', defined as habitat from where successful recruitment has resulted. Using biological data collected during the period...
Tipo: Text
Palavras-chave: Sardine; Potential spawning habitat; Generalized additive models; Environmental effects; Bay of Biscay; Anchovy.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2180.pdf

Using acoustic telemetry to estimate post-release survival of undulate ray Raja undulata (Rajidae) in northeast Altantic
Provedor de dados: 5
Autores: Morfin, Marie; Simon, Julien; Morandeau, Fabien; Baulier, Loic; Méhault, Sonia; Kopp, Dorothee.
The landing obligation introduced in the reform of the European Union Common Fisheries Policy requires landing all catches of species under quota. However, exemptions may be granted for species for which “scientific evidence demonstrates high survival rates”. Captivity experiments are often used to determine fish survival rates, but they are difficult to perform for large species such as rays due to the limited storage capacity of tanks. Thus, little information is available on ray survival after release despite an identified potential for high survival. We used acoustic telemetry to study rays discarded from a coastal bottom trawl fishery in their natural environment and present a new ad hoc approach to derive a minimum survival rate. After capture under...
Tipo: Text
Palavras-chave: Tagging; Discard survival; Trawl fishery; Elasmobranchs; Bay of Biscay.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00503/61432/65312.pdf

Développement d'une plateforme d'évaluation de plans de gestion spatialisés : application à la pêcherie mixte démersale du golfe de Gascogne
Provedor de dados: 5
Autores: Vigier, Audric.
North-East Atlantic fisheries management goes towards a regionalisation, accounting for mixed fisheries technical interaction. Hence, understanding and assessing the spatio-temporal dynamics of exploited species and the fleets exploiting them is needed. This study aims to provide a tool to assess the effects of several management scenarii in the Bay of Biscay. lt fouses on North-east Atlantic northern hake stock (Merluccius merluccius) and the mixed demersal hake - sole (Solea solea) - Norway lobster (Nephrops norvegicus) Bay of Biscay fisheries.A Management Strategy Evaluation (MSE) framework has been developed, pairing a spatial northern hake stock assessment model, and an operating model (lSlS-Fish) simulating the Bay of Biscay mixed demersal...
Tipo: Text
Palavras-chave: Merlu; Golfe de Gascogne; Evaluation de stratégies de gestion; Hake; Bay of Biscay; Management strategy evaluation; ISIS-Fish; Stock synthesis.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00498/60972/64380.pdf

Stable isotope ratios in bentho-demersal biota along a depth gradient in the bay of biscay: A multitrophic study
Provedor de dados: 5
Autores: 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

A partnership between science and industry for a monitoring of anchovy &amp; sardine in the Bay of Biscay: When fishermen are actors of science
Provedor de dados: 5
Autores: Masse, Jacques; Sanchez, Florence; Delaunay, Damien; Robert, J. M.; Petitgas, Pierre.
Anchovy and sardine are small pelagic species occupying similar geographic areas in the Bay of Biscay (North-East Atlantic). Their biomass is strongly dependent on recruitment, making the annual assessment of TAC (Total Allowable Catch) a risky strategy due to uncertainty in predicting the magnitude of recruitment. Monitoring these resources more often and throughout their life cycle could allow management strategies to be adjusted based on observations which indicate the level of recruitment. In order to achieve a more frequent monitoring, an innovative data collection strategy involving a partnership between fishermen and scientists, was developed in 2009 and 2010 called “pilot sentinel surveys”. This paper details the partnership, the information such a...
Tipo: Text
Palavras-chave: Sporadic acoustic surveys; Bay of Biscay; Small pelagic monitoring; Recruitment indicators; Fishermen's surveys.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00301/41214/41006.pdf

Campagne Techorhago
Provedor de dados: 5
Autores: Vacherot, Jean-philippe.
Pour être en phase avec les recommandations de la communauté européenne, les missions ORHAGO doivent utiliser un chalut à perche pour la constitution des indices d'abondance de sole dans le golfe de Gascogne. Un chalut à perche de 4 m (environ 2000 kg) a été construit et acheté aux Pays-Bas dans l'optique des futures campagnes à la mer. La campagne TECHORHAGO visait à essayer et à mettre au point les différentes manoeuvres de mise à l'eau et de virage du chalut en le remorquant sur les deux treuils du Gwen-Drez. L'EROC (Engin Remorqué d'Observation des Chaluts) était embarqué.
Tipo: Text
Palavras-chave: Eroc; Gwen Drez; Fishing; Technology; Beam trawl; Bay of Biscay; Sole; Pêche; Technologie; Eroc; Gwen drez; Chalut à perche; Golfe de Gascogne; Sole; Indice d'abondance.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-4594.pdf

Impact of warming on abundance and occurrence of flatfish populations in the Bay of Biscay (France)
Provedor de dados: 5
Autores: Hermant, Marie; Lobry, Jeremy; Bonhommeau, Sylvain; Poulard, Jean-charles; Le Pape, Olivier.
The aim of the present study was to analyse the influence of warming on flatfish populations in the Bay of Biscay. 17 autumn cruises conducted from 1987 to 2006 over the whole shelf of the Bay of Biscay provided data for the abundance and occurrence of adults for twenty flatfish species. Trends in flatfish abundance were analysed with regard to geographic range of populations and interannual fluctuations in abundance were related to seawater temperature. Results showed significant trends in abundance and occurrence for 55% of the flatfish species in the Bay of Biscay. The response to warming of seawater was correlated to geographic ranges of species. While the abundance of the northern temperate species decreased, that of southern ones increased. Moreover,...
Tipo: Text
Palavras-chave: Flatfish; Temporal Trends; Interannual Variability; Climate Change; Geographic Distribution; Bay of Biscay.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00008/11922/8638.pdf

Are trawl marks a good indicator of trawling pressure in muddy sand fishing grounds?
Provedor de dados: 5
Autores: Merillet, Laurene; Kopp, Dorothee; Robert, Marianne; Salaun, Michele; Mehault, Sonia; Bourillet, Jean-francois; Mouchet, Maud.
The development of the vessel monitoring system (VMS) in the recent years has offered high-resolution data to map the distribution and intensity of fishing activities and contributed to enhancing the potential identification of fishing impacts. However, impacts could vary at very small scale and the resolution of VMS data might not be fine enough. Other proxy could be used, such as trawl marks visible on the seabed observed by underwater video or side-scan sonar to evaluate small-scale trawling effort. In the Bay of Biscay, an underwater video survey of the Nephrops norvegicus fishing ground was conducted and provided environmental characteristics such as depth and number of trawl marks at 152 transects. The relevance of observed trawl marks as a...
Tipo: Text
Palavras-chave: Bay of Biscay; Fishing intensity; Sediments; Underwater video; Vessel monitoring system.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00410/52112/52854.pdf

Les pêcheries mixtes de langoustine et de merlu du golfe de Gascogne. Description, préparation à une modélisation et à une simulation des procédures de gestion
Provedor de dados: 5
Autores: Charuau, Anatole; Ifremer.
1 - Study's goals review The management of Norway Lobster and Hake fisheries can be considered as the most important issue in the Gascogne gulf. Calculation methods used to evaluate prediction variations under various efforts and mesh constraints all pinpoint to the crucial role narrow mesh fishing plays in Hakes' Northern stock status. The involvement of Gascogne gulf Norway Lobster fisheries regarding Hakes over exploitation seems over dimensioned when comparing the size of both of these stocks. Hake stocks spread from Northern Great Britain to Northern Spain, while Norway Lobster stocks are located in the Gascogne gulf's mud flats. The biological solution is well known and consists in globally  increasing mesh nets to 80mm which would bring up Hakes...
Tipo: Text
Palavras-chave: Procedures of management; Modeling; Bay of Biscay; Mixed fishery; Lobster; Hake.
Ano: 1987
URL: http://archimer.ifremer.fr/doc/1987/rapport-1763.pdf

Poissons et invertébrés au large des côtes de France. Indicateurs issus des pêches scientifiques. Bilan 2004
Provedor de dados: 5
Autores: Bertrand, Jacques; Cochard, Marie-laure; Coppin, Franck; Leaute, Jean-pierre; Lobry, Jeremy; Mahe, Jean-claude; Morin, Jocelyne; Poulard, Jean-charles; Rochet, Marie-joelle; Schlaich, Ivan; Souplet, Arnauld; Trenkel, Verena; Verin, Yves; SIH-C.
The integration of fishing management into the ecosystemic approach has been recommended for many years by international consultative bodies; it is also written into international conventions and agreements. The implementation of the ecosystemic approach involves the development of programmes for monitoring exploited ecosystems in order to measure the effects of management steps. Plotting the results of these observations for operational reasons requires formalizing summary performance indicators.  IFREMER has carried out halieutic observation campaigns for some twenty years along the coasts of France from oceanographic ships and chartered ships. The objective of these campaigns is to produce abundance indices of species that are of halieutic interest....
Tipo: Text
Palavras-chave: Ecosystem; Indicating; Scientific survey; Scientific research; Fishing; English Channel; Bay of Biscay; France; Shellfish; Fish; Invertébrés; Poissons; Ecosystème; Indicateur; Campagne océanographique; Recherche scientifique; Pêche halieutique; Pêche; Mer du nord; Golfe de gascogne; Manche; France.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-2327.pdf

Les flottilles de pêche dans la mer territoriale du golfe de Gascogne
Provedor de dados: 5
Autores: Leaute, Jean-pierre.
The regular aerial survey over the Bay of Biscay (France) by the French Custom Air Service enabled us to record precisely in 2001 the geographical positions of French fishing vessels inside the 12 nautical miles of the French Bay of Biscay (from Bay of Audierne to Spanish border). Among the 2396 ships counted in this area, 1810 were identified, corresponding actually to 900 boats since most of them (52 %) were seen several times. These 900 boats referred to 4 different "métiers", i.e. type of fishing activity: most of them (59 %) were bottom trawlers, 28 % gillnetters, 5 % potters and 5 % longliners; those which used another gear were less than 4 %. General characteristics of the 900 ships were identified: tonnage and power were respectively 25 TJB and 185...
Tipo: Text
Palavras-chave: French EEZ; "métiers"; Aerial census; Fishing fleet; Bay of Biscay; ZEE française; Métiers; Survols aériens; Flottilles de pêche; Golfe de Gascogne.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-6521.pdf

Acoustic detection of the spatial and temporal distribution of fish shoals in the Bay of Biscay
Provedor de dados: 5
Autores: Scalabrin, Carla; Masse, Jacques.
Echo sounder data were used to investigate the spatio-temporal variability of shoal behaviour in the Bay of Biscay. Data collected from annual surveys were processed using MOVIES-B software in order to mcasure this variability. The software was designed to measure morphological, energetic and space-time distribution descriptors from the acoustic signal received from fish shoals. Two surveys, DAAG 90 and DAAG 91, provided the appropriate characteristics for such an analysis. The survey's objective was to obtain relative abundance indices for the anchovy (Engraulis encrasicolus) biomass in the Bay of Biscay. The surveys were carried out in the same area (southern Bay of Biscay), at the same period (April) within one year interval (1990 and 1991), using the...
Tipo: Text
Palavras-chave: Fish shoal; Fisheries acoustics; Bay of Biscay; Pelagic fish.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00190/30111/28580.pdf

Analyse des petits pelagiques, sardine et anchois, dans le golfe de Gascogne
Provedor de dados: 5
Autores: Coiffec, Gaelle; Duhamel, Erwan; Biseau, Alain; Danzart, Marc.
Since 1993 the yearly amounts of sardine landings for the Bay of Biscay fishing ports have experienced a constant increase (10,000 tonnes in 1993); on that account sardine is the first species landed in the fishing ports of the Bay of Biscay (15,000 tonnes in 2003). It is sold 0.54 € / kg (constant price over ten years) which means a 8,100 k€ turnover in 2003 and the 12th rank in value landed in the fishing ports of Bay of Biscay. Though anchovy landings have decreased over the last ten years, especially since 2001, this species occupies the 3rd rank of the highest landings (7,300 tonnes) of the Atlantic shoreline in 2003.The decrease of anchovy landings over the last ten years may account for the high increase of its constant sale price of 1.5 € / kg from...
Tipo: Text
Palavras-chave: Purse seiner; Midwater pair  trawler; Sardine; Anchovy; Pelagic; Bay of Biscay; Recrutement; Senneur; Chalutier pelagique; Bolincheur; Sardine; Anchois; Pelagique; Golge de Gascogne.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/rapport-2287.pdf

Activité et production des navires français – Façade "Manche est" et Façade "Loire-Gironde"
Provedor de dados: 5
Autores: Delpech, Jean-paul; Mehault, Sonia; Rostiaux, Emilie; Leaute, Jean-pierre; Leblond, Emilie; Demaneche, Sebastien; Coppin, Franck; Mahe, Kelig; Vaz, Sandrine.
This report is a result of a contract between Ifremer and the French Ministry of Industry. The aim was to provide map the fisheries activity and landings for french fishing vessels, located in the Eastern Channel and the Bay of Biscay during the year 2005. Two areas have been selected:  - the "Eastern Channel" area, including 7 administrative departments : Nord, Pas-de-Calais, Somme, Seine-Maritime, Eure, Calvados and Manche. - the "Loire-Gironde" area, including 4 administrative departments : Loire-Atlantique, Vendée, Charente-Maritime and Gironde.
Tipo: Text
Palavras-chave: Fishing fleets; Fishing gears; Bay of Biscay; Eastern Channel; Mapping; Landings; Fisheries activity; Flottilles; Pêche; Engins; Golfe de Gascogne; Manche est; Cartographie; Production; Activité halieutique.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-6645.pdf

Influence of bottom trawling on sediment resuspension in the 'Grande-Vasière' area (Bay of Biscay, France)
Provedor de dados: 5
Autores: Mengual, Baptiste; Cayocca, Florence; Le Hir, Pierre; Draye, Robin; Laffargue, Pascal; Vincent, Benoit; Garlan, Thierry.
Sea trials were performed on two zones with different fishing efforts on the continental shelf of the Bay of Biscay ('Grande-VasiSre' area of muddy sand) in order to assess particulate matter resuspension and seabed disturbances (i.e., penetration, reworking, grain size changes) induced by different types of trawls. Optical and acoustic measurements made in the water column indicate a significant trawling-induced resuspension mainly due to the scraping action of doors. It manifests as a highly dynamic turbid plume confined near the seabed, where suspended sediment concentrations can reach 200 mg l(-1). Concentration levels measured behind an "alternative" configuration (trawls with jumper doors instead of classical doors penetrating the sediment) are...
Tipo: Text
Palavras-chave: Bottom trawling; Sedimentresuspension; Seabed disturbance; Erosion flux; Bay of Biscay.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00353/46428/51396.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

Analysis of tagging data from North Atlantic Albacore (Thunnus Alalunga): Attrition Rate Estimates
Provedor de dados: 5
Autores: Ortiz De Zarate, Victoria; Bertignac, Michel.
In this study, an attempt is made to estimate natural mortality rate for North Atlantic albacore. We implement a spatially aggregated tag-attrition model to analyse the results of an albacore tagging experiment conducted in the Bay of Biscay from 1988 to 1991. The model predicts probabilities of the possible fates of tagged fish and the tags that they carry. The model includes several parameters consisting of catchabilities by fleets involved in recaptures and a combination of natural mortality plus emigration from the study area. Model fitting is carried out by finding the maximum of a multinomial likelihood function. Effect of reporting rate values on the estimations are evaluated and several hypothesis on the pre-mixing period of the tagged fish...
Tipo: Text
Palavras-chave: Bay of Biscay; Attrition rate; Model; Natural mortality estimation; Albacore.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-977.pdf

Anchovy (Engraulis encrasicolus) egg density measurements in the Bay of Biscay: evidence for the spatial variation in egg density with sea surface salinity
Provedor de dados: 5
Autores: Goarant, Anne; Petitgas, Pierre; Bourriau, Paul.
Knowledge of the pelagic vertical distribution of fish eggs is central for several aspects of fisheries science including fisheries recruitment and egg production studies. In modelling egg vertical distributions, variation in fish egg density is an important issue. Though variation in egg density between individual eggs has been reported, evidence for significant spatial variation in egg density is novel. The present study provides evidence that egg density of anchovy (Engraulis encrasicolus) varies spatially across spawning sites in the Bay of Biscay, depending on the regional scale variation in sea water properties due to river discharge. We measured the density of the eggs using a density gradient column at 17 stations in 2005 and 2006 as well as their...
Tipo: Text
Palavras-chave: Bay of Biscay; Anchovy; Fish egg density; Density gradient column.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3007.pdf

Monitoring of a quasi-stationary eddy in the Bay of Biscay by means of satellite, in situ and model results
Provedor de dados: 5
Autores: Caballero, Ainhoa; Ferrer, Luis; Rubio, Anna; Charria, Guillaume; Taylor, Benjamin H.; Grima, Nicolas.
The presence of a quasi-stationary anticyclonic eddy within the southeastern Bay of Biscay (centred around 44°30′N-4°W) has been reported on various occasions in the bibliography. The analysis made in this study for the period 2003–2010, by using in situ and remote sensing measurements and model results shows that this mesoscale coherent structure is present almost every year from the end of winter-beginning of spring, to the beginning of fall. During this period it remains in an area limited to the east by the Landes Plateau, to the west by Le Danois Bank and Torrelavega canyon and to the northwest by the Jovellanos seamount. All the observations and analysis made in this contribution, suggest that this structure is generated between Capbreton and...
Tipo: Text
Palavras-chave: Bay of Biscay; Eddies; SWODDIES; Topographic effects; Vortex; Mesoscale; Altimetry; Satellite oceanography; Drifters; ROMS.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00161/27260/25469.pdf

Exploitation, éléments de croissance et de dynamique du stock de coquilles Saint-Jacques (Pecten maximus, L.) des Pertuis Charentais
Provedor de dados: 5
Autores: Blanchard, Fabian.
Tipo: Text
Palavras-chave: Bay of Biscay; Pecten maximus; Growth; Exploitation; Stock assesment.
Ano: 1995
URL: https://archimer.ifremer.fr/doc/1995/rapport-523.pdf

Cold-water coral habitats in the Penmarc'h and Guilvinec Canyons (Bay of Biscay): Deep-water versus shallow-water settings
Provedor de dados: 5
Autores: De Mol, Lies; Van Rooij, David; Pirlet, Hans; Greinert, Jens; Frank, Norbert; Quemmerais-amice, Frederic; Henriet, Jean-pierre.
In 1948, Le Danois reported for the first time the occurrence of living cold-water coral reefs, the so-called "massifs coralliens", along the European Atlantic continental margin. In 2008, a cruise with R/V Belgica was set out to re-investigate these cold-water corals in the Penmarc'h and Guilvinec Canyons along the Gascogne margin of the Bay of Biscay. During this cruise, an area of 560 km(2) was studied using multibeam swath bathymetry, CTD casts, ROV observations and USBL-guided boxcoring. Based on the multibeam data and the ROV video imagery, two different cold-water coral reef settings were distinguished. In water depths ranging from 260 to 350 m, mini mounds up to 5 m high, covered by dead cold-water coral rubble, were observed. In between these...
Tipo: Text
Palavras-chave: Bay of Biscay; Continental margin; Canyons; Cold-water corals; Lophelia; Madrepora.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00035/14632/13318.pdf

Evidence of a relationship between weight and total length of marine fish in the North-eastern Atlantic Ocean: physiological, spatial and temporal variations
Provedor de dados: 5
Autores: Mahe, Kelig; Bellamy, Elise; Delpech, Jean-paul; Lazard, Coline; Salaun, Michele; Verin, Yves; Coppin, Franck; Travers-trolet, Morgane.
Weight–Body Length relationships (WLR) of 45 fish species (37 Actinopterygii and eight Elasmobranchii) were investigated. A total of 31,167 individuals were caught and their biological parameters measured during the four quarters from 2013 to 2015, on five scientific surveys sampling the North-eastern Atlantic Ocean from the North Sea to the Bay of Biscay (ICES Divisions IVb, IVc, VIId, VIIe, VIIg, VIIh, VIIj, VIIIa and VIIIb). Among 45 tested species, all showed a significant correlation between total length (L) and total weight (W). The influence of sex on WLR was estimated for 39 species and presented a significant sexual dimorphism for 18 species. Condition factor (K) of females was always higher than for males. Moreover, a spatial effect on the WLR...
Tipo: Text
Palavras-chave: Weight-length relationship; Condition factor; Bay of Biscay; Celtic Sea; English Channel; North Sea; Sexual dimorphism; Seasonality.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00363/47418/47513.pdf

Instabilities and deformation in the sedimentary cover on the upper slope of the southern Aquitaine continental margin, north of the Capbreton canyon (Bay of Biscay)
Provedor de dados: 5
Autores: Gonthier, E; Cirac, P; Faugeres, J; Gaudin, Mathieu; Cremer, M; Bourillet, Jean-francois.
Acoustic and core data have recently been collected on the shelf break and the upper part of the slope of the south Aquitaine continental margin. They reveal the major role played by mass-flow gravity processes in deposit erosion and redistribution, modelling of the sea-bed, and transfer of sediment toward the deep-sea. The study region is bounded in the south by the Capbreton canyon. The northern area, which shows a smooth morphology, is characterised by small-scale deformations due to sediment creep or low-amplitude slide processes. The deformations are associated with mini listric-like faults that bound packets of sediments in which the deposit geometry is typical of constructional sediment waves. These sediment waves result from the interaction of...
Tipo: Text
Palavras-chave: Sediment transfer; Mass flows; Sediment wave; Continental slope; Canyon; Bay of Biscay.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3960.pdf

Observations ichtyologiques effectuées en 2004
Provedor de dados: 5
Autores: Quero, Jean-claude; Bellail, Robert; De Casamajor, Marie-noelle; Leaute, Jean-pierre; Morandeau, Gilles; Moriniere, P; Spitz, J; Vayne, Jean-jacques.
During 2004, Caranx crysos and Echeneis naucrates are caught in the Bay of Biscay, at north of their known repartition. The capture in our waters of two specimens of Cyttopsis rosea, the eighth specimen of Trachinotus ovatus and six Lagocephalus lagocephalus are mentioned. NOT CONTROLLED OCR
Tipo: Text
Palavras-chave: Bay of Biscay; Northern record; Lagocephalus lagocephalus; Trachinotus ovatus; Cyttopsis rosea; Echeneis naucrates; Caranx Crysos; Golfe de Gascogne; Lagocephalus lagocephalus; Trachinotus ovatus; Cyttopsis rosea; Echeneis naucrates; Caranx Crysos.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-3658.pdf

Analyse des flottilles du sud du golfe de Gascogne, de 1986 à 2002 – De Noirmoutier à Bayonne. Description et évolution des composantes de pêche
Provedor de dados: 5
Autores: Leaute, Jean-pierre.
This document presents a comparative assessment of six triennal analysis carried out between 1986 and 2002, on 1300 boats, on average, from the 35 ports of Southern Bay of Biscay fishing fleets (from Loire river to Spanish border). Fisheries statistics allow the identification of different fishing practices and fishing boats associated with them within the fleets. In order to allow comparison and analysis of the evolution that has taken place during the study period, the same variables (gears used, landed species) and multivariate analysis procedures have been used to produce groupings of vessels.   Over the period, 11 components, on average, have been identified, grouped in two entities, mobile and fixed gears. If the discriminative characteristics...
Tipo: Text
Palavras-chave: Typologie; Flottilles de pêche; Composantes; Golfe de Gascogne; Analyse multivariée; Typology; Fishing fleet; Components; Bay of Biscay; Multivariate analysis.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00001/11234/7756.pdf

Decadal stability in top predator habitat preferences in the Bay of Biscay
Provedor de dados: 5
Autores: Lambert, C.; Authier, M.; Doray, Mathieu; Doremus, G.; Spitz, J.; Ridoux, V.
Most oceanographic systems, especially shelf ecosystems, are characterised by interannual variability in the timing, extent and intensity of their seasonal patterns. Such interannual variations have important consequences on top predator habitat preferences. Capitalising on oceanographic surveys performed every spring since 2004 in the Bay of Biscay (BoB), this study explored interannual variations in habitat preferences exhibited by five mobile top predator species: bottlenose and common dolphins, auks, fulmars and northern gannets. We expected to find species with similar habitat preferences every year or species exhibiting important variability in their habitat preferences. First, we identified with a Principal Component Analysis (PCA) three different...
Tipo: Text
Palavras-chave: Habitat preference; Temporal variability; Cetaceans; Seabirds; North Atlantic; Bay of Biscay.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00431/54226/55549.pdf

A coupled movement and bioenergetics model to explore the spawning migration of anchovy in the Bay of Biscay
Provedor de dados: 5
Autores: Politikos, Dimitrios; Huret, Martin; Petitgas, Pierre.
Adult anchovies in the Bay of Biscay perform north to south migration from late winter to early summer for spawning. However, what triggers and drives the geographic shift of the population remains unclear and poorly understood. An individual-based fish model has been implemented to explore the potential mechanisms that control anchovy's movement routes toward its spawning habitats. To achieve this goal, two fish movement behaviors – gradient detection through restricted area search and kinesis – simulated fish response to its dynamic environment. A bioenergetics model was used to represent individual growth and reproduction along the fish trajectory. The environmental forcing (food, temperature) of the model was provided by a coupled...
Tipo: Text
Palavras-chave: Individual-based model; Behavioral movement; Dynamic Energy Budget; Anchovy; Bay of Biscay.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00273/38446/36868.pdf

A toolbox to evaluate data reliability for whole-ecosystem models: Application on the Bay of Biscay continental shelf food-web model
Provedor de dados: 5
Autores: Lassalle, Geraldine; Bourdaud, Pierre; Saint-beat, Blanche; Rochette, Sebastien; Niquil, Nathalie.
Ecosystem models are always simplifications of reality and as such their application for ecosystem-based management requires standard validation. Here, the “DataReli” toolbox is proposed to evaluate the quality of the data used during the construction of ecosystem models, their coherence across trophic levels, and whether data limitations prevent the model long-term applications. This toolbox is the combination of three operational and complementary analyses: (i) the pedigree index to determine to what extent a model was calibrated on data of local origin; (ii) the graphical analysis known as PREBAL to assess whether a model respects some basic ecological and fisheries principles; and (iii) a sensitivity analysis to evaluate the robustness of model...
Tipo: Text
Palavras-chave: Food-web model; Ecopath; Model evaluation; Parameter uncertainty; Ecosystem-based management; Bay of Biscay.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00188/29969/28484.pdf

Concentrations of mercury and other trace elements in two offshore skates: sandy ray Leucoraja circularis and shagreen ray L. fullonica
Provedor de dados: 5
Autores: Nicolaus, E. E. Manuel; Barry, Jon; Bolam, Thi P. C.; Lorance, Pascal; Marandel, Florianne; Phillips, Sophy R. Mccully; Neville, Suzanna; Ellis, Jim R.
Trace metal concentrations in muscle and liver tissues from two offshore species of skate were examined. Concentrations of mercury in muscle of Leucoraja circularis (n = 20; 23–110.5 cm total length, 157–490 m water depth) and L. fullonica (n = 24; 28.5–100 cm total length, 130–426 m water depth) were 0.02–1.8 and 0.04–0.61 mg kg− 1, respectively. Concentrations of both As and Hg increased with total length. Only the largest specimen had a concentration of Hg in muscle &gt; 1.0 mg kg− 1. Data were limited for specimens &gt; 90 cm long, and further studies on contaminants in larger-bodied skates could usefully be undertaken.
Tipo: Text
Palavras-chave: Trace metals; Sandy ray; Shagreen ray; Bay of Biscay; Celtic Sea.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00397/50829/51592.pdf

Les petites pêches côtières et estuariennes Françaises du sud du golfe de Gascogne. Typologie des flottilles et approche socio-économique et commerciale
Provedor de dados: 5
Autores: Leaute, Jean-pierre; Caill-milly, Nathalie.
The European contract PECOSUDE (Small inshore fisheries of the south of Europe) accepted in 2000 for 2 years concerns French, Spanish and Portuguese partners. The aim is to assess the inshore and estuarine fisheries from Loire estuary to Portugal. Three levels of study are considered : fisheries (data 1999), socioeconomy and marketing (data 1999 or 2000). Exploitation in the 12 miles area for France and on continental shelf for northern Spain and Portugal (within 1000 m depth), as well as the fishing period lower than 96 hours was determined as the definition of this fishery for the study. Socioeconomic analyses are made only on boats smaller than 15 m. The fisheries part analyses the activity of the fishing vessels taking into account gears used, landed...
Tipo: Text
Palavras-chave: Commercialisation; Indicateur économique; Pêcherie; Flottille de pêche côtière et estuarienne; Enquête socio économique; Typologie; Golfe de Gascogne; Marketing; Economic indicator; Fishery; Coastal and estuarine fishing fleet; Socioeconomic inquirie; Typology; Bay of Biscay.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/2003/rapport-1572.pdf

Using a quantitative model for participatory geo-foresight: ISIS-Fish and fishing governance in the Bay of Biscay
Provedor de dados: 5
Autores: Provot, Zoe; Mahévas, Stephanie; Tissière, Laurie; Michel, C.; Lehuta, Sigrid; Trouillet, B.
This study investigated the use of a complex quantitative simulation model for participatory geo-foresight for the governance of the marine socio-ecosystem in the Bay of Biscay. The approach is simulation-based combining qualitative and quantitative expert-knowledge focusing on the demersal fishery in the Bay of Biscay. A three-stage approach was carried out : (i) translation by stakeholders of a narrative scenario drawn up during the geo-foresight into quantitative sub-scenarios that could be parameterized in ISIS-Fish; (ii) simulation with ISIS-Fish and study of the consequences of the sub-scenarios on the dynamics of the fishery; and (iii) participants feedback on the relevance of the model, on the possibility to detail the narrative scenario further...
Tipo: Text
Palavras-chave: Geo-foresight; Participatory; Spatial; Complex quantitative; Model; ISIS-Fish; Scenarios; Fishery dynamics; Bay of Biscay.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00459/57034/69604.pdf

Contrasting years in the Gironde estuary (Bay of Biscay, NE Atlantic) springtime outflow and consequences for zooplankton pyruvate kinase activity and the nutritional condition of anchovy larvae: an early view
Provedor de dados: 5
Autores: Bergeron, Jean-pierre.
A major spawning ground of the European anchovy (Engraulis encrasicolus) population in the Bay of Biscay is located near the mouth of the Gironde estuary. Variations in the river discharge affect the supply of nutrients to the coastal marine area encompassing anchovy spawning grounds. Two "Pegase" cruises (May-June 1997 and 1998) observed two contrasting situations: with and without a superficial layer of less saline water. Two new nutritional indices were used to assess potential effects (1) on carbohydrate assimilation rates by zooplankton estimated via pyruvate kinase (PK) activity measurements and (2) on nutritional condition of the anchovy larvae measured with the DNA/C index. Both indices indicated a much poorer situation in 1997 compared to 1998....
Tipo: Text
Palavras-chave: River outflow; Pyruvate kinase; DNA/C index; Bay of Biscay; Anchovy larvae.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/2004/publication-448.pdf

Les dinophycées pélagiques et benthiques du Golfe de Gascogne sud de la Bretagne à Arcachon
Provedor de dados: 5
Autores: Paulmier, Gerard.
Les microphytes planctoniques et benthiques du Golfe de Gascogne sont relativement diversifiés. Cette diversification est probablement en rapport avec la situation hydrologique particulière de cette région enrichie par des mélanges de masses d'eau de diverses origines et par des apports continentaux importants. Dans ce contexte, les dinophycées sont nombreuses et variées et occupent toutes les niches écologiques. 230 taxons ont été répertoriés. Quelques espèces sont connues pour provoquer périodiquement des colorations de la mer "eaux rouges" et quelques-unes sont maintenant redoutées pour leur toxicité.
Tipo: Text
Palavras-chave: Zone pélagique; Zone benthique; Phytoplancton; Diversité espèces; Niche écologique; Inventaire floristique; Cycle développement; Répartition géographique; Morphologie; Pyrrophycophyta; Golfe de Gascogne; Bretagne; Landes; Algae; Thallophyta; Océan Atlantique Nord; Océan Atlantique; France; Europe; Aquitaine; Pelagic zone; Benthic zone; Phytoplankton; Species diversity; Niche; Floral survey; Life cycle; Geographic distribution; Morphology; Pyrrophycophyta; Bay of Biscay; Bretagne; Landes; Algae; Thallophyta; North Atlantic; Atlantic Ocean; France; Europe; Aquitaine.
Ano: 1994
URL: http://archimer.ifremer.fr/doc/00260/37097/35613.pdf

Interaction between marine populations and fishing activities: temporal patterns of landings of La Rochelle trawlers in the Bay of Biscay
Provedor de dados: 5
Autores: Poulard, Jean-charles; Leaute, Jean-pierre.
Marine populations are distributed heterogeneously in space and time because of the diversity of habitats and the requirements of species life cycles. Human exploitation of these resources also varies as a function of space, time and the type of fishing activities performed. These three factors determine fishing strategy at different levels of integration. The purpose of this study was to describe and analyse, with respect to different time scales, the relations between the modalities of resource exploitation and the biological or demographic characteristics of the species involved. These investigations relate to the more general task of acquiring the basic knowledge needed for spatialised management of fishing effort. A fleet of trawlers from La Rochelle,...
Tipo: Text
Palavras-chave: Atlantic ocean; Bay of Biscay; Seasonal variability; Multiple factor analysis; Bottom trawlers; Landings.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-1397.pdf

Integration of bioenergetics in an individual-based model to hindcast anchovy dynamics in the Bay of Biscay
Provedor de dados: 5
Autores: Bueno-pardo, Juan; Petitgas, Pierre; Kay, Susan; Huret, Martin.
The population of European anchovy of the Bay of Biscay collapsed at the beginning of the 21st century, causing the closure of its fishery between 2005 and 2010. In order to study both the human and environmental causes of the anchovy population dynamics, an approach coupling individual bioenergetics to an individual-based model was applied between 2000 and 2015. This modelling framework was forced with outputs from a physical–biogeochemical model. In addition to a base-case scenario with realistic forcing, alternative scenarios were run without inter-annual variability in either fishing mortality or environmental conditions. During the decrease in population biomass, a high fishing pressure coincided with a combination of environmental variables promoting...
Tipo: Text
Palavras-chave: Anchovy; Bay of Biscay; Dynamic Energy Budget; Fishery; Harvest control rule; Individual-based model; Population collapse.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00598/70984/69272.pdf

The impact of the last European deglaciation on the deep-sea turbidite systems of the Celtic-Armorican margin (Bay of Biscay)
Provedor de dados: 5
Autores: Zaragosi, Sébastien; Bourillet, Jean-francois; Eynaud, Frédérique; Toucanne, Samuel; Denhard, Benjamin; Van Toer, Aurélie; Lanfumey, Valentine.
The compilation of results obtained on three giant piston cores from the Whittard, Shamrock and Guilcher turbidite levees reveals a high-resolution stratigraphic record for the Bay of Biscay. Due to the abundance of reworked sediments in these sedimentary environments, a specific methodological approach, based on an X-ray-assisted subsampling phase associated with sedimentological, geochemical and micropalaeontological analyses, was implemented. With an accurate chronological framework, this multi-proxy investigation provides observations on the 'Fleuve Manche' palaeoriver and the British-Irish Ice Sheet (BIS) histories over the last 20,000 years. The results obtained highlight the direct influence of the decay of the BIS on the Bay of Biscay deep-sea...
Tipo: Text
Palavras-chave: Sedimentation; Glaciation; Turbidity; Deep sea; Bay of Biscay; French Atlantic margin.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2142.pdf

Narrowing down the number of species requiring detailed study as candidates for the EU Common Fisheries Policy discard ban
Provedor de dados: 5
Autores: Morfin, Marie; Mehault, Sonia; Benoit, Hugues P.; Kopp, Dorothee.
By 2019, the Common Fisheries Policy will prohibit discarding in all European fisheries of any pelagic, demersal or shellfish species for which removals are managed by TACs and quotas or minimum sizes. However, the regulation allows for exemptions from the prohibition for species for which scientific evidence demonstrates high survival rates associated with discarding. Producing reliable evidence of high survival typically requires long and costly studies involving tagging or captivity. This paper proposes to use the capacity to resist air exposure, a key stressor for discarded animals, as a proxy for survival that can be used to prioritize candidate species for more in-depth discard survival studies. The time required to induce mortality (TM) in...
Tipo: Text
Palavras-chave: Landing obligation; Discard mortality; Hypoxia; Artisanal bottom trawl fishery; Bay of Biscay; English Channel.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00362/47281/49145.pdf

Circulation on the shelf and the upper slope of the Bay of Biscay
Provedor de dados: 5
Autores: Le Boyer, Arnaud; Charria, Guillaume; Le Cann, Bernard; Lazure, Pascal; Marie, Louis.
Here, we used measurements taken with an array of 10 acoustic Doppler current profilers deployed from July 2009 to August 2011 to describe the tidally filtered circulation over the shelf and upper slope on the French side off the French coasts of the Bay of Biscay. The measurements provided an overview of the shelf and slope circulation throughout the entire water column over a large range of spatial and time scales. The average circulation over the shelf and upper slope of the Bay of Biscay was poleward following the topography with a speed of the order of 3 cm s(-1). This average circulation had marked seasonal variability. In summer, the currents were equatorward on the outer shelf near surface. Deeper in the water column, the flow remained poleward. In...
Tipo: Text
Palavras-chave: Bay of Biscay; Observation; Shelf and slope circulation; Vertical profile; ADCP; Wind driven circulation.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00139/24976/26395.pdf

Meroplankton distribution and its relationship to coastal mesoscale hydrological structure in the northern Bay of Biscay (NE Atlantic)
Provedor de dados: 5
Autores: Ayata, Sakina-dorothee; Stolba, Robin; Comtet, Thierry; Thiebaut, Eric.
The relationship between meroplankton distribution and spatio-temporal variability of coastal mesoscale hydrological structure was investigated in the northern Bay of Biscay, North-East Atlantic. For the three coastal polychaetes studied, i.e. Pectinaria koreni, Owenia fusiformis and Sabellaria alveolata, the highest larval abundances were sampled in low-salinity, low-density and high-temperature river plume waters. For two species (P. koreni and O. fusiformis), maximal abundances were observed in the surface and thermocline layers due to ontogenic migrations. Variance partitioning based on multiple regression and redundancy analyses was used to assess the relative roles played by the hydrological environment alone, the geographical space alone and their...
Tipo: Text
Palavras-chave: Meroplankton; Larval transport; Mesoscale structures; River plume; Fronts; Owenia fusiformis; Pectinaria koreni; Sabellaria alveolata; Bay of Biscay.
Ano: 2011
URL: https://archimer.ifremer.fr/doc/00240/35131/33632.pdf

Les flottilles de pêche de l'Union Européenne dans le golfe de Gascogne vues du ciel
Provedor de dados: 5
Autores: Leaute, Jean-pierre.
Regular flights over the Bay of Biscay by the French Customs Air Service, have enabled us to record more precisely, from 1989 to 1995, the geographical locations of French and other European Community (EU) fishing boats. Data showed three main 'metiers' within the Bay of Biscay fishing fleet: French and Spanish bottom trawlers (61 %), French gill-netters and Spanish longliners: More than 80 % of gill-netters worked inside the territorial sea (12 nautical miles) and 60 % of them worked south of Noirmoutier (47 degrees N). Longliners moved according to the seasons, from the edge of the continental shelf to the 50-100 m sounding lines. Since they work at night, only few pelagic trawlers have been recorded (records being made in daylight). The potters, liners...
Tipo: Text
Palavras-chave: Bay of Biscay; Fishing fleet; Aerial census; Metier; French EEZ.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-855.pdf

First Comprehensive Quantitative Multi-Parameter Assessment of the Eutrophication Status from Coastal to Marine French Waters in the English Channel, the Celtic Sea, the Bay of Biscay, and the Mediterranean Sea
Provedor de dados: 5
Autores: Lefebvre, Alain; Devreker, David.
The first quantitative and comprehensive assessment of the eutrophication status from coastal to offshore French waters was performed within the Marine Strategy Framework Directive (MSFD descriptor 5) for the English Channel, the southern bight of the North Sea, the Celtic Seas, the Bay of Biscay and the Western Mediterranean Sea. Based on a combination of different data sources (in situ, satellite, and modeling products), a fully-integrated dataset was generated over the period 2010–2016. Using the best available knowledge on the eutrophication process and definition, the assessment procedure was implemented considering nutrient pressures, and direct and indirect effects of excessive inputs. The different steps of the assessment were: (i) Establishment of...
Tipo: Text
Palavras-chave: Eutrophication; Assessment; Marine Strategy Framework Directive (MSFD); Water Framework Directive (WFD); Oslo and Paris Convention (OSPAR); English Channel; Celtic Seas; Bay of Biscay; Mediterranean Sea; Nutrients; Chlorophyll; Oxygen; Turbidity; Phytoplankton; Macro-algae.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00641/75350/76083.pdf

Predation has no competition: factors influencing space and resource use by echinoids in deep-sea coral habitats, as evidenced by continuous video transects
Provedor de dados: 5
Autores: Stevenson, Angela; Mitchell, Fraser J. G.; Davies, Jaime S.
Predation and competition are highly influential factors determining space use in foraging animals, and ultimately contribute to the spatial heterogeneity observed within habitats. Here we investigated the influence of competition and predation on space and resource use via continuous video transect observations – a tool that has not previously been employed for this purpose. This study therefore also evaluates video data as a pragmatic tool to study community interactions in the deep sea. Observations were compiled from 15 video transects spanning five submarine canyons in the Bay of Biscay, France. Substrate choice, positioning on the coral, echinoid aggregate size, and the presence/absence of predators (e.g. fish and decapods) as well as competitors...
Tipo: Text
Palavras-chave: Aggregation; Bay of Biscay; Cidaris cidaris; Community interactions; Deep sea; Echinothuriidae; NE Atlantic; Refuge; Space use.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00242/35303/33829.pdf

Small-scale variability of zooplankton pyruvate kinase activity in the Gironde Estuary plume (Atlantic French Coast): A case study under unusually low freshwater discharge
Provedor de dados: 5
Autores: Bergeron, Jean-pierre.
Pyruvate kinase (PK) activity measurements are used to assess the role of carbohydrates in global feeding of mesozooplankton communities inhabiting an estuary plume. As a consequence of a remarkably low freshwater discharge rate, the sea surface layers of the area under estuarine influence showed a very moderate salinity fall and a nearly total depletion in nitrates, whereas higher levels of these nutrients were found in deeper, more saline, layers. Small-scale PK activity variations in mesozooplankton appear to be closely correlated to nitrate integration values within the water column. The results were analysed in comparison with literature reports. The study produced a coherent overall interpretation, which strongly supports the reliability of this new...
Tipo: Text
Palavras-chave: Gironde Estuary; Bay of Biscay; Pyruvate kinase; Pyruvate kinase; Carbohydrates; Zooplankton; Phytoplankton; Chlorophyll; Inorganic nutrients.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-1745.pdf

A quantitative estimate of the function of soft-bottom sheltered coastal areas as essential flatfish nursery habitat
Provedor de dados: 5
Autores: Trimoreau, E.; Archambault, Benoit; Brind'Amour, Anik; Lepage, Mario; Guitton, Jerome; Le Pape, O.
Essential fish habitat suitability (EFHS) models and geographic information system (GIS) were combined to describe nursery habitats for three flatfish species (Solea solea, Pleuronectes platessa, Dicologlossa cuneata) in the Bay of Biscay (Western Europe), using physical parameters known or suspected to influence juvenile flatfish spatial distribution and density (i.e. bathymetry, sediment, estuarine influence and wave exposure). The effects of habitat features on juvenile distribution were first calculated from EFHS models, used to identify the habitats in which juvenile are concentrated. The EFHS model for S. solea confirmed previous findings regarding its preference for shallow soft bottom areas and provided new insights relating to the significant...
Tipo: Text
Palavras-chave: Coastal and estuarine dependent species; Nursery ground; Habitat suitability models; Geographic Information System; Bay of Biscay.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00164/27546/25720.pdf

Comparative assessment of two proxies of fish discard survival
Provedor de dados: 5
Autores: Morfin, Marie; Kopp, Dorothee; Benoît, Hugues P.; Méhault, Sonia.
Two vitality index approaches have been demonstrated to be good proxies of discard survival in similar fishing and environmental conditions: Reflex Action Mortality Predictors combined with injuries (RI) scores that measure the proportion of impaired reflexes and injuries, and a simpler, quicker, but less precise approach based on ordinal categories related to fish body movements and injuries (semi-quantitative assessment, SQA). This study assessed and compared these two approaches for five species (two flatfishes, skates, a seabass and a catshark) discarded in a coastal otter trawl fishery in the Bay of Biscay. All species displayed good vitality status according to both indices and were not very sensitive to the fishing nor their biological conditions....
Tipo: Text
Palavras-chave: Discard survival; Vitality indicators; Reflex Action Mortality Predictor; Bay of Biscay; Coastal otter trawl fishery.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00466/57817/60417.pdf

Twenty years of satellite and in situ observations of surface chlorophyll-a from the northern Bay of Biscay to the eastern English Channel. Is the water quality improving?
Provedor de dados: 5
Autores: Gohin, Francis; Van Der Zande, Dimitry; Tilstone, Gavin; Eleveld, Marieke A.; Lefebvre, Alain; Andrieux-loyer, Francoise; Blauw, Anouk N.; Bryère, Philippe; Devreker, David; Garnesson, Philippe; Hernandez Farinas, Tania; Lamaury, Yoann; Lampert, Luis; Lavigne, Héloïse; Menet-nedelec, Florence; Pardo, Silvia; Saulquin, Bertrand.
The variability of the phytoplankton biomass derived from daily chlorophyll-a (Chl-a) satellite images was investigated over the period 1998–2017 in the surface waters of the English Channel and the northern Bay of Biscay. Merged satellite (SeaWiFS-MODIS/Aqua-MERIS-VIIRS) Chl-a was calculated using the OC5 Ifremer algorithm which is optimized for moderately-turbid waters. The seasonal cycle in satellite-derived Chl-a was compared with in situ measurements made at seven coastal stations located in the southern side of the English Channel and in the northern Bay of Biscay. The results firstly showed that the satellite Chl-a product, derived from a suite of space-borne marine reflectance data, is in agreement with the coastal observations. For compliance with...
Tipo: Text
Palavras-chave: Satellite remote-sensing; Ocean colour; Phytoplankton; Chlorophyll-a; English Channel; Bay of Biscay; Eutrophication assessment; European marine strategy framework directive.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00513/62514/66811.pdf

Two “pillars” of cold-water coral reefs along Atlantic European margins: Prevalent association of Madrepora oculata with Lophelia pertusa, from reef to colony scale
Provedor de dados: 5
Autores: Arnaud-haond, Sophie; Van Den Beld, Inge; Becheler, Ronan; Orejas, C.; Menot, Lenaick; Frank, N.; Grehan, A.; Bourillet, Jean-francois.
The scleractinian coral Lophelia pertusa has been the focus of deep-sea research since the recognition of the vast extent of coral reefs in North Atlantic waters two decades ago, long after their existence was mentioned by fishermen. These reefs where shown to provide habitat, concentrate biomass and act as feeding or nursery grounds for many species, including those targeted by commercial fisheries. Thus, the attention given to this cold-water coral (CWC) species from researchers and the wider public has increased. Consequently, new research programs triggered research to determine the full extent of the corals geographic distribution and ecological dynamics of “Lophelia reefs”. The present study is based on a systematic standardised sampling design to...
Tipo: Text
Palavras-chave: Lophelia pertusa; Madrepora oculata; False-chimaera colonies; Cold water corals (CWC); Bay of Biscay; Ireland; Iceland.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00274/38530/37048.pdf

Mortalité du tourteau Cancer pagurus provoquée par le dinoflagelle parasite : Hematodinium sp.
Provedor de dados: 5
Autores: Latrouite, Daniel; Morizur, Yvon; Noel, Philippe; Chagot, Dominique; Wilhelm, G.
Unusural crab mortality in winter led us to identify a Hematodinium like parasitic dinoflagellate in the blood of edible crabs Cancer pagurus. Crabs from several fishing areas (the English Channel, the Iroise sea, the bay of Biscay, off Scotland) and from one area of the Channel shore were examined. The crab parasit was found everywhere we investigated and throughout the year. The prevalence which was found independant of the intermolt stage, sex and size of crabs was higher inshore than offshore. The pathogenicity is assumed to differ according to season.
Tipo: Text
Palavras-chave: Edible crab; Pathology; Bay of Biscay; Iroise sea; Channel; Parasite; Mortality; Hematodinium; Bitter crab desease; Dinoflagelle; Aquiculture; Cancer pagurus; Mortalité; Hematodinium; Cancer pagurus; Tourteau; Pathologie.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/1988/acte-1418.pdf

Major changes in sardine growth and body condition in the Bay of Biscay between 2003 and 2016: Temporal trends and drivers
Provedor de dados: 5
Autores: Veron, Matthieu; Duhamel, Erwan; Bertignac, Michel; Pawlowski, Lionel; Huret, Martin.
In the Bay of Biscay, mean body length and weight of sardines (Sardina pilchardus) have been decreasing since the early 2000s and could severely impact the fishing and seafood industry sector. These trends have no apparent link with fishing pressure, although the latter has been increasing since the late 2000s. As part of an effort to develop suitable assessment and management tools for this stock, we investigated the life-history traits of sardine and analyze its seasonal and inter-annual variations. Based on 14 years of morphometric data from both scientific surveys and professional samples, we analyzed the variability in sardine body condition and its responses to environmental changes. Generalized Additive Models revealed an age-sex specific decreasing...
Tipo: Text
Palavras-chave: Body condition; Growth; Decadal trends; Environmental effect; Life history traits; Sardina pilchardus; Bay of Biscay.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00604/71562/69989.pdf

Temporal trends and spatial structures of the sea surface temperature in the Bay of Biscay
Provedor de dados: 5
Autores: Koutsikopoulos, Constantin; Beillois, Pierre; Leroy, Claude; Taillefer, Françoise.
A time series spatial grid of sea surface temperature (SST) data provided by the archives of Meteo-France and covering the period 1972-1993 was analysed in order to define both the long-term and periodic (mainly seasonal) components at different locations in the Bay of Biscay. The study confirmed the existence of a long-term increasing trend in the SST, but showed that this trend was not homogeneous over the entire area. It revealed also that the amplitude of the cyclic components (summer-winter differences) is spatially heterogeneous. The south-eastern part of the Bay of Biscay, close to the French-Spanish border, shows the stronger warming trend (a mean increase of 1.4 degrees C for the period 1972-1993). This trend decreases in the adjacent regions and...
Tipo: Text
Palavras-chave: Bay of Biscay; Sea surface temperature; Time series; Long-term trend; Seasonal changes.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/1998/publication-852.pdf

Vertical and horizontal controls of a haptophyte thin layer in the Bay of Biscay, France
Provedor de dados: 5
Autores: Farrell, Hazel; Gentien, Patrick; Fernand, Liam; Lazure, Pascal; Lunven, Michel; Youenou, Agnes; Reguera, Beatriz; Raine, Robin.
Investigations into the phytoplankton of the Bay of Biscay in July 2006 revealed an extensive bloom of an unidentified haptophyte species. High-resolution sampling techniques identified the region in the vicinity of the mouth of the Loire estuary as an area of high (106–107 cells l−1) cell densities of the haptophyte in a thin sub-surface layer. This organism dominated the phytoplankton population regionally. Measurements of the vertical distribution of horizontal shear showed that the population, located at ca. 20 m depth, was confined to a layer lying between two density discontinuities with high shear. Physical measurements indicated that the population was being advected southeastwards, along the coast. Seaward spreading of the population was also...
Tipo: Text
Palavras-chave: Haptophyte; Bay of Biscay; Horizontal dispersal; Thin layers.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00160/27129/25327.pdf

Evidence of heavy predation by Noctiluca scintillans on Acartia clausi (Copepoda) eggs off the central Cantabrian coast (NW Spain)
Provedor de dados: 5
Autores: Quevedo, M; Gonzalez-quiros, R; Anadon, R.
A large proliferation of Noctiluca scintillans (Dinophyceae: Noctilucidea) was observed in neritic waters off the central Cantabrian coast during late April 1995. Eggs of Acartia clausi (Crustacea: Copepoda) were the most conspicuous prey within vacuoles of Noctiluca. Noctiluca ingested 73 % of the total stock of A. clausi eggs. This intense predation on copepod eggs could potentially affect the recruitment of nauplii. The potential impact on the stock of Acartia clausi eggs and on the daily egg production of the population is discussed. There is a negative correlation between the average number of ingested eggs by a single Noctiluca cell and the abundance of Noctiluca. This fact, coupled with the lack of significant correlation between the former variable...
Tipo: Text
Palavras-chave: Noctiluca; Acartia; Œufs de copépode; Prédation; Golfe de Gascogne; Noctiluca; Acartia; Copepod eggs; Predation; Bay of Biscay.
Ano: 1999
URL: http://archimer.ifremer.fr/doc/00325/43633/43232.pdf

Cold-water coral habitats in submarine canyons of the Bay of Biscay
Provedor de dados: 5
Autores: Van Den Beld, Inge; Bourillet, Jean-francois; Arnaud-haond, Sophie; De Chambure, Laurent; Davies, Jaime S; Guillaumont, Brigitte; Olu, Karine; Menot, Lenaick.
The topographical and hydrological complexity of submarine canyons, coupled with high substratum heterogeneity, make them ideal environments for cold-water coral (CWC) habitats. These habitats, including reefs, are thought to provide important functions for many organisms. The canyons incising the continental slope of the Bay of Biscay have distinct morphological differences from the north to the south. CWCs have been reported from this basin in the late 19th century; however, little is known about their present-day distribution, diversity and environmental drivers in the canyons. In this study, the characteristics and distribution of CWC habitats in the submarine canyons of the Bay of Biscay are investigated. Twenty-four canyons and three locations...
Tipo: Text
Palavras-chave: Cold-water corals; Habitats; Submarine canyons; Bay of Biscay; NE Atlantic; ROV; Towed camera; Distribution.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00382/49343/49733.pdf

Trophic models: What do we learn about Celtic Sea and Bay of Biscay ecosystems?
Provedor de dados: 5
Autores: Moullec, Fabien; Gascuel, Didier; Bentorcha, Karim; Guenette, Sylvie; Robert, Marianne.
Trophic models are key tools to go beyond the single-species approaches used in stock assessments to adopt a more holistic view and implement the Ecosystem Approach to Fisheries Management (EAFM). This study aims to: (i) analyse the trophic functioning of the Celtic Sea and the Bay of Biscay, (ii) investigate ecosystem changes over the 1980–2013 period and, (iii) explore the response to management measures at the food web scale. Ecopath models were built for each ecosystem for years 1980 and 2013, and Ecosim models were fitted to time series data of biomass and catches. EcoTroph diagnosis showed that in both ecosystems, fishing pressure focuses on high trophic levels (TLs) and, to a lesser extent, on intermediate TLs. However, the interplay between local...
Tipo: Text
Palavras-chave: Ecosystem Approach to Fisheries Management (EAFM); Bay of Biscay; Celtic Sea; Ecopath with Ecosim; EcoTroph; Trophic indicators.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00377/48771/49169.pdf

Do river discharge rates drive the overall functioning of the pelagic ecosystem over the continental shelf of the Bay of Biscay (NE Atlantic)? A comparison of two contrasting years with special reference to anchovy (Engraulis encrasicolus L.) nutritional state
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Delmas, Daniel; Koueta, Noussithe.
In the 2000 and 2001 springtime periods, mesozooplankton samples were systematically taken during research cruises devoted to the study of the distribution and abundance of small pelagic fishes in the French part of the Bay of Biscay, NE Atlantic, continental shelf. Simultaneous activities of three enzymes were measured in these mesozooplankton samples, to characterize the main features of ecosystem function at a regional scale. The aim was to assess assimilation rates of carbohydrates, through pyruvate kinase activity, and protein, through trypsin activity, by the mesozooplankton community and the resulting overall productivity, through aspartate transcarbamylase activity. The highest influence on the pelagic environment was the strong difference in the...
Tipo: Text
Palavras-chave: Rivers discharge; Phytoplankton distribution; Anchovy; Nutritional state; RNA/DNA ratio; Mesozooplankton; Metabolic descriptors; North-East Atlantic; Bay of Biscay.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00012/12290/9089.pdf

Influence of planktonic foodweb structure on a system's capacity to support pelagic production: an inverse analysis approach
Provedor de dados: 5
Autores: Marquis, Elise; Niquil, Nathalie; Vezina, Alain F.; Petitgas, Pierre; Dupuy, Christine.
Coupled plankton/small pelagic (SP) fish systems were analysed to assess how foodweb structure influences the export of carbon to pelagic fish during the spring bloom in the Bay of Biscay. The investigation of carbon export flows through inverse analysis was supplemented by estimating the carrying capacity for pelagic fish production by applying linear programming. A planktonic foodweb dominated by microbial pathways had the highest trophic efficiency owing to the tight coupling between planktonic trophic levels and predation pressure on mesozooplankton by fish. Moreover, the magnitude of the gap between carrying capacity and estimated carbon export was related to the size structure of primary producers, with the picophytoplankton-based foodweb having the...
Tipo: Text
Palavras-chave: Bay of Biscay; Carbon export; Carrying capacity; Inverse analysis; Planktonic foodweb; Small pelagic fish.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00035/14583/13375.pdf

First record of Parapristipoma octolineatum (Haemulidae) on the French Atlantic coast.
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle.
A specimen of African striped grunt Parapristipoma octolineatum was observed on the French part of the Bay of Biscay. This is the first and the most northern record of this species in the Northeastern Atlantic. Moreover, no specimen of this family was ever listed in this geographical area. Repeated observations of the same individual during the four consecutive past years in summer (2013-2016), suggest its adaptation to environmental conditions of this area.
Tipo: Text
Palavras-chave: Haemulidae; Parapristipoma octolineatum; Bay of Biscay; New record.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00354/46514/46276.pdf

Habitat suitability for juvenile common sole (Solea solea, L.) in the Bay of Biscay (France): A quantitative description using indicators based on epibenthic fauna
Provedor de dados: 5
Autores: Le Pape, Olivier; Baulier, Loic; Cloarec, Aurélie; Martin, Jocelyne; Le Loch, Francois; Desaunay, Yves.
This study describes the spatial distribution of young-of-the-year common sole based on beam trawl surveys conducted in late summer in the coastal and estuarine parts of the Bay of Biscay (France). Previous studies showed that habitat suitability for juvenile common sole varies according to physical factors and notably bathymetry and sediment structure. Nevertheless, the use of these descriptors alone to model habitat suitability led to considerable unexplained variability in juvenile common sole distribution. Hence, the epibenthic macro- and megafauna collected during beam trawl surveys was taken into account to improve models of habitat suitability for these juvenile flatfish. Ecotrophic guilds based on life traits (behaviour, mobility and feeding) were...
Tipo: Text
Palavras-chave: Bay of Biscay; Ecotrophic guilds; Epibenthic fauna; Habitat suitability models; Nursery ground; Solea solea.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2402.pdf

Reconstruction des transferts sédimentaires en provenance du système glaciaire de Mer d'Irlande et du paléofleuve Manche au cours des derniers cycles climatiques
Provedor de dados: 5
Autores: Toucanne, Samuel.
The Pleistocene has been period of fluctuating climate accompanied by prominent sea-level lowstands during the glacial intervals, when massive continental ice sheets extended from mountainous to lowland European areas. The retreat of the shoreline on the extensive present-day shallow continental shelf of the southern part of the British Isles induced the appearance of the 'Fleuve Manche' palaeoriver, one of the largest systems that drained the European continent. Sedimentary records from the Bay of Biscay offer an independent record allowing the reconstruction of the freshwater and sediment discharges of the 'Fleuve Manche', and the possibility of detecting the imprint of surrounding ice-sheet oscillations and attendant modification of hinterland drainage...
Tipo: Text
Palavras-chave: Land sea correlations; European fluvial system; Glacial Irish Sea system; 'Fleuve Manche' palaeoriver; Ice sheets; Glaciations; Climate; Pleistocene; Turbidite systems; Sediment transfer; Bay of Biscay; Corrélations terre mer; Réseau de drainage européen; Système glaciaire de Mer d'Irlande; Fleuve Manche; Calottes glaciaires; Glaciations; Climat; Pléistocène; Systèmes turbiditiques; Transferts sédimentaires; Golfe de Gascogne.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6328.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

Redescription of Psolus tessellatus Koehler, 1896 (Echinodermata, Holothuroidea) with neotype designation
Provedor de dados: 5
Autores: Massin, Claude.
In the bycatch of a scientific campaign in the Bay of Biscay (VITAL 2002) a third specimen of Psolus tessellatus Koehler, 1896 was collected very close to the type locality. This specimen is here fully illustrated and designated as the neotype.
Tipo: Text
Palavras-chave: Psolidae; Bay of Biscay; Redescription; First illustration; Neotype.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00129/24030/21986.pdf

Comparison of airborne lidar with echosounders: a case study in the coastal Atlantic waters of southern Europe
Provedor de dados: 5
Autores: Carrera, Pablo; Churnside, J.h.; Boyra, G; Marques, V; Scalabrin, Carla; Uriarte, A.
The feasibility of using airborne lidar (Light Detection and Ranging) was studied to assess the early juvenile fractions of the main pelagic fish species of the coastal Atlantic waters of southern Europe (anchovy, sardine, mackerel, and horse mackerel). Field comparisons with more established echosounder methods were undertaken in the summers of 1998 and 1999 during the recruitment period of sardine and anchovy in the selected areas, in the presence of a variety of oceanographic and environmental conditions. Backscattered energies as well as the types of target recorded by both devices were compared. The distributions of energies and the shape of the targets were generally similar for both techniques, with moderate numerical correlation between sensors,...
Tipo: Text
Palavras-chave: West Iberian Peninsula; Sardine; Recruitment; Echosounder; Bay of Biscay; Anchovy; Airborne lidar.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2139.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

Dynamics of harvested demersal fish communities: analysis of the species diversity in the Bay of Biscay (Atlantic Ocean) and in the Gulf of Lions (Mediterranean Sea).
Provedor de dados: 5
Autores: Blanchard, Fabian.
Species diversity variations between the demersal fish assemblages of the Bay of Biscay (Atlantic Ocean) and of the Gulf of Lions (Mediterranean Sea) are analysed on a decade scale. The aim of this study is to interpret the dynamics of these two communities characterised by different level of fishing intensity. Data come from trawl surveys carried out for the direct evaluation of the demersal stocks abundance from 1983 to 1997. Diversity indices used are the Hill's indices N1 and N2, the species richness S, the evenness J', the K-dominance curves and the life strategy of the dominant species. Three demersal fish assemblages are defined in the community of the Bay of Biscay and in that of the Gulf of Lions: coastal, continental shelf, and continental slope....
Tipo: Text
Palavras-chave: Gulf of Lions; Bay of Biscay; Demersal fish; Community dynamics; Species diversity.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-1393.pdf

Contribution et Dépendance des flottilles de pêche aux espèces commerciales majeures du Golfe de Gascogne
Provedor de dados: 5
Autores: Daures, Fabienne; Planchot, Marie; Demaneche, Sebastien; Van Isenghem, Sylvie; Berthou, Patrick; Leblond, Emilie; Jezequel, Michele.
In order to provide economic indicators for fisheries, analysis of contribution and economic dependencies of the Bay of Biscay fishing fleets to major commercial species catching in the ICES VIII area is conducted. 9 species are considered (regarding the importance of their landings in this area): Sole, Norway Lobster, Sea bass, Hake, Anglerfish, Anchovy, Sardine, Cuttlefish and Monkfish. The landings data are provided by the Harmonie database of the Fisheries Information System of Ifremer and the analysis per specie is done for the 2005 year on one side and over the period 2000-2005 on the other side. A stock slip is built for each species and presents :  - Key figures on landings in the Bay of Biscay (total landings, average price, number of vessels...
Tipo: Text
Palavras-chave: Bay of Biscay; Fleet; Economic dependence; DEM; Golfe de Gascogne; Flotte de pêche; Dépendance économique.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/rapport-4697.pdf

Managing mixed fisheries for bio-economic viability
Provedor de dados: 5
Autores: Gourguet, Sophie; Macher, Claire; Doyen, Luc; Thebaud, Olivier; Bertignac, Michel; Guyader, Olivier.
Management of fisheries for sustainability requires dealing with multiple and often conflicting objectives. A stochastic viability approach is proposed to address the trade-offs associated with balancing ecological, economic and social objectives in regulating mixed fisheries, taking into account the complexity and uncertainty of the dynamic interactions which characterize such fisheries. We focus on the demersal fishery in the Bay of Biscay and more specifically on the fleets harvesting Norway Lobster (Nephrops norvegicus), Hake (Merluccius merluccius) and Sole (Solea solea). A bio-economic multi-species and multi-fleet model with technical interactions is developed to examine the trade-offs between preserving Spawning Stock Biomass (SSB) of every species...
Tipo: Text
Palavras-chave: Bay of Biscay; Bio-economic model; Co-viability; Fisheries; Uncertainty.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00129/23999/22052.pdf

Détermination des "bassins récepteurs" marins des principaux fleuves français de la façade Manche-Atlantique, et de leurs rôles respectifs dans l'eutrophisation phyto-planctonique des masses d'eau DCE et des sous-régions DCSMM. Phase 1 (2013) : Calcul de scénarios optimaux à partir des " bassins récepteurs". Phase 2 (2014) : Simulation de scénarios imposés et des scénarios optimaux
Provedor de dados: 5
Autores: Menesguen, Alain; Dussauze, Morgan.
- This study (granted up to 50% by the French Office for Water and Aquatic Environments ONEMA) aimed at determining by modelling (hydrodynamical/biogeochemical ECOMARS3D model) the marine "receiving basins" of the main tributaries to the French waters of the English Channel and the Bay of Biscay. Knowing the respective part of each of these marine "receiving basins" in winter nutrient distribution, some optimal scenarios of nutrient loading reduction can be computed for nitrate or phosphate in order to bring back any marine water to the Good Ecological Status regarding eutrophication, at the best efficiency/cost ratio. - The study encompasses 45 watersheds (or clusters of neighboring watersheds) which have been retained because of their sizes and flow...
Tipo: Text
Palavras-chave: Zone Manche-Atlantique; Modélisation 3D; Bassins versants; Bassins récepteurs marins; Nitrate; Phosphate; Réduction d'apports; Situation "pristine"; Production primaire; Oxygène dissous; Classement DCE; Bon Etat Ecologique; Optimisation linéaire; Simplexe; Optimisation quadratique; Méthode de Beale.; English Channel; Bay of Biscay; 3D modelling; Watersheds; Receiving basins; Nitrate; Phosphate; Nutrient loading reduction; Pristine situation; Primary production; Dissolved oxygen; WFD classification; Good Ecological Status; Linear optimisation; Simplexe method; Quadratic optimisation; Beale's method.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00333/44422/44083.pdf

Nutritional condition of anchovy Engraulis encrasicolus larvae in connection with mesozooplankton feeding catabolism in the southern Bay of Biscay, NE Atlantic
Provedor de dados: 5
Autores: Bergeron, Jean-pierre.
The study examines the spatial variations over the French continental shelf of the southern Bay of Biscay (North-East Atlantic) in the nutritional condition of anchovy (Engraulis encrasicolus L.) larvae which was estimated through their DNA/C index. The same cruise yielded quantitative estimates of two metabolic descriptors of the functioning of mesozooplanktonic communities, the enzymes pyruvate kinase (PK) and trypsin, for the first time evaluated simultaneously. The aim was to appraise quality and quantity of matter assimilated by the mesozooplankton and to specify whether the main components of prey ingested by copepods are principally carbohydrates, through PK activity, or protein, under the action of the digestive endopeptidase trypsin. The larval...
Tipo: Text
Palavras-chave: Anchovy larvae; Bay of Biscay; DNA/C index; Mesozooplankton; Pyruvate kinase; Trypsin.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6473.pdf

Biological productivity enhancement over a continental shelf break (Bay of Biscay, NE Atlantic) evidenced by mesozooplankton aspartate transcarbamylase activity
Provedor de dados: 5
Autores: Bergeron, Jean-pierre; Koueta, Noussithe.
During spring of 2005, satellite imagery revealed high sea surface chlorophyll a concentrations over the edge of a wide continental shelf in the Bay of Biscay (NE Atlantic). As a descriptor of biological productivity, mesozooplankton aspartate transcarbamylase specific activity was measured in situ during the bloom. Notably high values were detected in the bloom area relative to other parts of the study area.
Tipo: Text
Palavras-chave: Aspartate transcarbamylase; Chlorophyll a; Mesozooplankton; Satellite imagery; Continental shelf break; Bay of Biscay.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00033/14474/11772.pdf

Connectivity patterns of anchovy larvae in the Bay of Biscay from a coupled transport-bioenergetic model forced by size-structured zooplankton
Provedor de dados: 5
Autores: Huret, Martin; Vandromme, Pieter; Petitgas, Pierre; Pecquerie, Laure.
Connectivity during early life stages of pelagic fish, defined here by survival probability between spawning and early juvenile habitats, depends on a combination of sufficient food availability and low predator encounter along drift trajectories. For anchovy in the Bay of Biscay, larval transport experiments throughout the spawning season suggest accumulation of early juveniles in the offshore area of the southern Bay, as well as retention over the mid-shelf at mid-latitude. However, late summer-early autumn surveys suggest presence of juveniles only in the former region. From this observation, we set up a bioenergetic individual based model to test for the effect of food availability on survival patterns. The model couples a Lagrangian transport module...
Tipo: Text
Palavras-chave: Connectivity; Larval IBM; Bioenergetics; Zooplankton; Bay of Biscay; European anchovy.
Ano: 2012
URL: http://archimer.ifremer.fr/doc/00105/21655/19237.pdf

Long-term and millennial-scale climate variability in northwestern France during the last 8850 years
Provedor de dados: 5
Autores: Naughton, F; Bourillet, Jean-francois; Fernanda, M; Turon, J; Jouanneau, J.
Vegetation and quantitative climate reconstructions from a northwestern France shelf core (VK0358Bis) show orbital and suborbital climate variability for the last 8850 years in this region. A long-term cooling trend in summer temperatures, marked by gradual temperate and humid forest decline, parallels cooling in Greenland and the decrease of mid-latitude summer insolation reduction until at least 2000 cal. yr BP. At the long-term scale, the lowering in seasonal contrast revealed by vegetation changes follows the increase of precession. Corylus woodlands spread at the expense of deciduous Quercus forest, between 8740 and 8390 cal. yr BP, linked with the high seasonality conditions that, counterbalancing the long-term astronomical forcing trend, were...
Tipo: Text
Palavras-chave: Bay of Biscay; France; Europe; Vegetation; Marine core; Corylus; 8.2 kyr event; Millennial scale climate variability; Long term cooling; Holocene.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-4205.pdf

Poleward along-shore current pulses on the inner shelf of the Bay of Biscay
Provedor de dados: 5
Autores: Kersale, M.; Marie, Louis; Le Cann, B.; Serpette, A.; Lathuiliere, C.; Le Boyer, A.; Rubio, A.; Lazure, Pascal.
We analyzed strong events of coastal poleward along-shore currents above 10 cm s−1 and up to more than 50 cm s−1 on the inner shelf (50-80 m depth) of the Bay of Biscay (BoB) from the Spanish coast to the Brittany coast. We used data from four acoustic Doppler current profilers (ADCPs) deployed from July 2009 to August 2011. The goal of this study was to analyze current variability at meso- and subinertial scales and their generation mechanisms. These currents occurred all year long and were classified into three types. Events occurring principally in the southern part of the BoB were classified as southern events. Bay-scale events were defined when strong poleward currents were detected over all the shelf, typically stronger on the Spanish and the...
Tipo: Text
Palavras-chave: Coastal jets; ADCP; Shelf circulation; Wind forcing; Coastal trapped waves; Bay of Biscay.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00299/40984/40075.pdf

Investigating the coupling between small pelagic fish and marine top predators using data collected from ecosystem-based surveys
Provedor de dados: 5
Autores: Certain, G.; Masse, Jacques; Van Canneyt, O.; Petitgas, Pierre; Doremus, G.; Santos, M. B.; Ridoux, Vincent.
The present study is a general multivariate analysis of the spatial association between small pelagic fishes and their predators (seabirds, marine mammals and fisheries), using 6 yr (18000 km) of transects surveyed in spring in the Bay of Biscay, France. We describe 4 groups of prey-predator association, with explicit distinction of prey size: (1) terns and anchovies (10 to 15 cm), (2) common dolphins, common murres, sprat and sardine (&lt;20 cm), (3) gannets, horse mackerel and mackerel (15 to 25 cm) and (4) bottlenose dolphin, horse mackerel and mackerel (25 to 40 cm). Our analysis also illustrates the great variability in these associations, with years of strong prey-predator associations followed by years of weak relationships. The analysis allows us...
Tipo: Text
Palavras-chave: Marine top predators; Small pelagic fishes; Spatial associations; Temporal variability; Pelagic ecosystem; Bay of Biscay.
Ano: 2011
URL: http://archimer.ifremer.fr/doc/00031/14257/11540.pdf

Survey timing vs. ecosystem scheduling: Degree-days to underpin observed interannual variability in marine ecosystems
Provedor de dados: 5
Autores: Huret, Martin; Bourriau, Paul; Doray, Mathieu; Gohin, Francis; Petitgas, Pierre.
Fishery annual surveys are shifting towards integrated ecosystem surveys. However, monitoring the whole ecosystem once a year entails special attention to the interpretation of observations, because they only represent a snapshot in the seasonal dynamics of the environment, of a species, or any dynamic process of interest. The dependency of this snapshot to the timing, but also to the duration, of the survey with respect to this seasonal dynamics needs to be considered. Fish stock assessment is only little impacted by the observed timing within a given season, whereas warming, stratification, plankton bloom occurrence, or fish fecundity, are processes rapidly changing especially in spring. Firstly, from independent satellite data, we described the seasonal...
Tipo: Text
Palavras-chave: Ecosystem survey; Anchovy; Sardine; Spawning; Sea surface temperature; Degree day; Bay of Biscay.
Ano: 2018
URL: http://archimer.ifremer.fr/doc/00394/50584/51483.pdf

Sardine series in PELGAS surveys : PELGAS 2000 to 2005
Provedor de dados: 5
Autores: Masse, Jacques; Duhamel, Erwan; Delaunay, Damien.
Survey data from 2000 to 2004 were used to analyse whether sardine show a preferential distribution in relation to bottom depth and/or latitude. For this analysis, four strata were considered; North or South of latitude 46°N (separating VIIIa and VIIIb) and bottom depths deeper or shallower than 110m. Sardine length distributions are plotted as the proportion of small (&lt; 18.5 cm) or big (larger than 18.5 cm) fish on the samples over the years. This division was chosen to take into account the bimodal structure of sardine length distributions (usually with a "valley" at 18.5 cm fish length). Small fish (mainly 1 year old) are generally found close to the coast and preferentially in the southern part. The year 2003 is different to the others but this year...
Tipo: Text
Palavras-chave: Assessment; Sardine; Bay of Biscay; Acoustic; Survey; ICES; PELGAS; Estimation de stock; Sardine; Golfe de Gascogne; Acoustique; Campagne océanographique; CIEM; PELGAS.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/acte-2294.pdf

The role of phosphorus on planktonic production of the Gironde plume waters in the Bay of Biscay
Provedor de dados: 5
Autores: Labry, Claire; Herbland, Alain; Delmas, Daniel.
More and more studies emphasize the status of phosphorus (P) as the principal limiting nutrient of phytoplankton growth, especially in coastal waters under the influence of freshwater discharges. The purpose of the present paper is to investigate the role of P on planktonic production in the waters influenced by the Gironde discharges; the Gironde being one of the two largest rivers on the French Atlantic coast. The survey is based on several cruises made in 1998 and 1999. Two different patterns were observed for waters with salinity below and above 34.5. For waters with salinity &lt;34.5. P was found to be the first limiting nutrient of winter and spring phytoplankton blooms, based on undetectable phosphate (&lt;20 nM), high NO3 : PO4 ratios, typically...
Tipo: Text
Palavras-chave: Bay of Biscay; River plume; Salinity; Water quality analysis; Phytoplankton; Planktonic production.
Ano: 2002
URL: http://archimer.ifremer.fr/doc/2002/publication-690.pdf

Distribution, encounter rates, and habitat characteristics of toothed cetaceans in the Bay of Biscay and adjacent waters from platform-of-opportunity data
Provedor de dados: 5
Autores: Kiszka, Jeremy; Macleod, Kelly; Van Canneyt, Olivier; Walker, Dylan; Ridoux, Vincent.
Data on the distribution and habitat utilization of oceanic marine mammals are difficult to collect and yet such information is beneficial for many conservation and management purposes. Data collected during ferry-based cetacean surveys in the English Channel and Bay of Biscay between 1998 and 2002 were analysed to investigate the distribution, encounter rate, and habitat characteristics of toothed cetaceans there. In all, 17 873 nautical miles were surveyed, and 1008 encounters of 13 identified species, including delphinids, ziphiids, harbour porpoise, and sperm whale, were recorded. The common dolphin was the commonest species, followed in decreasing occurrence by striped and bottlenose dolphins, pilot whale, harbour porpoise, Cuvier's beaked whale, and...
Tipo: Text
Palavras-chave: Toothed cetaceans; Platforms of opportunity; Habitat characteristics; English Channel; Encounter rate; Distribution; Bay of Biscay; Bathymetric preference.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-3018.pdf

Analysing Temporal Variability in Spatial Distributions Using Min–Max Autocorrelation Factors: Sardine Eggs in the Bay of Biscay
Provedor de dados: 5
Autores: Petitgas, Pierre; Renard, Didier; Desassis, Nicolas; Huret, Martin; Romagnan, Jean-baptiste; Doray, Mathieu; Woillez, Mathieu; Rivoirard, Jacques.
This paper presents a novel application of the geostatistical multivariate method known as min–max autocorrelation factors (MAFs) for analysing fisheries survey data in a space–time context. The method was used to map essential fish habitats and evaluate the variability in time of their occupancy. Research surveys at sea on marine fish stocks have been undertaken for several decades now. The data are time series of yearly maps of fish density, making it possible to analyse the space–time variability in fish spatial distributions. Space–time models are key to addressing conservation issues requiring the characterization of variability in habitat maps over time. Here, the variability in fisheries survey data series is decomposed in space and time to address...
Tipo: Text
Palavras-chave: MAF; Space-time; Habitat; Mapping; Sardine; Bay of Biscay.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00599/71157/69915.pdf

Indices for capturing spatial patterns and their evolution in time, with application to European hake (Merluccius merluccius) in the Bay of Biscay
Provedor de dados: 5
Autores: Woillez, M; Poulard, Jean-charles; Rivoirard, Jacques; Petitgas, Pierre; Bez, Nicolas.
A series of candidate statistical indices is used in an attempt to capture spatial patterns of fish populations from research survey data. To handle diffuse population limits, indices are designed not to depend on arbitrary delineation of the domain. They characterize the location (centre of gravity and spatial patches), the occupation of space (inertia, isotropy, positive area, spreading area, and equivalent area), statistical dispersion (Gini index and coefficient of variation of strictly positive densities), and microstructure. Collocation between different ages and years is summarized by a global index of collocation. Indices are estimated for hake from a bottom-trawl data series in the Bay of Biscay in autumn of 1987-2004. The study provides a...
Tipo: Text
Palavras-chave: Spatial indices; European hake; Bay of Biscay.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2671.pdf

The French Atlantic margin and deep-sea submarine systems
Provedor de dados: 5
Autores: Bourillet, Jean-francois; Zaragosi, S; Mulder, T.
The sedimentary infill of the Bay of Biscay off Ireland, UK, France and Spain took place in four phases. The last one (35 Ma to present) is characterised by gravitational, pelagic, contouritic and glacigenic processes leading to the setup of three deep sea systems. To the North, the Celtic and Armorican fans are fed by a "canyon-dominated" margin and its connection with the "Manche" palaeoriver, which drained a large area of western Europe. To the South, the Cap-Ferret fan results from the evolution of a "tectonic-dominated" margin and the erosion of the Pyrenee mountains.
Tipo: Text
Palavras-chave: Sedimentology; Geomorphologya; Deep sea; Bay of Biscay; French Atlantic margin.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2137.pdf

The impact of climate change on the fish community structure of the eastern continental shelf of the Bay of Biscay
Provedor de dados: 5
Autores: Poulard, Jean-charles; Blanchard, Fabian.
Many fish species are at the southern or northern limit of their distribution range tit the Bay of Biscay, where large-scale hydroclimatic changes have occurred in recent decades. We attempt here to identify the impact of these changes on the fish community of the eastern continental shelf of the Bay of Biscay. Data collected during 14 autumn groundfish surveys in 1973 and from 1987 to 2002 are used. The study area is between latitudes 48 degrees 30'N and 43 degrees 30'N while the depth ranges from 15 to 200 m. Annual abundance indices (number of individuals per km(2)) of 56 fish taxa present on average in at least 5% of the tows are computed. Multivariate analysis is used to detect temporal trends in these species' abundance indices. Assuming that...
Tipo: Text
Palavras-chave: Groundfish surveys; Fish community; Climate change; Bay of Biscay.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-824.pdf

Lagrangian circulation of the North Atlantic Central Water over the abyssal plain and continental slopes of the Bay of Biscay: description of selected mesoscale features
Provedor de dados: 5
Autores: Serpette, A; Le Cann, Bernard; Colas, Francois.
Between 1994 and 2001, several experiments (ARCANE, SEFOS, INTERAFOS) were conducted to directly measure the general and mesoscale Lagrangian circulations over the Bay of Biscay abyssal plain and slopes. Two levels (~100 m and ~450 m) were selected to cover the North Atlantic Central Water range. Two types of Lagrangian instruments, drogued surface drifters tracked by satellite (Surdrift) and acoustically tracked subsurface floats (Rafos and Marvor), were used. Overall, more than 36 instrument-years were collected in the Bay of Biscay region (43-49°N, 01-12°W). The weak general circulation in the Bay of Biscay is seen to be highly influenced by the occurrence of several mesoscale coherent features, notably slope currents and eddies, and these affect the...
Tipo: Text
Palavras-chave: Slope ocean exchanges; Mesoscale eddies; Slope current; Lagrangian floats and surface drifters; Bay of Biscay.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-6435.pdf

Benthic prey production index estimated from trawl survey supports the food limitation hypothesis in coastal fish nurseries
Provedor de dados: 5
Autores: Day, Louise; Le Bris, Hervé; Saulnier, Erwan; Pinsivy, Lucas; Brind'Amour, Anik.
Coastal and estuarine habitats function as nurseries for many commercial marine species. In these ecosystems, the hypothesis that food supply limits juvenile fish density and survival has been widely debated. Direct approaches that test this hypothesis in temperate soft-bottom nurseries are data-intensive as they rely on beam trawl to collect juvenile fish and grab or core to collect their prey within the macrobenthic community. Thus, application has often been limited to a few sampling stations and temporal snapshots. However, scientific beam trawl surveys, conducted periodically in nurseries, sample, besides juvenile fish, benthic invertebrates including potential prey species. Using data collected solely from beam trawl surveys, we tested whether food...
Tipo: Text
Palavras-chave: Young-of-the-year fish; Macrobenthic production; Trawl; Grab; Bay of Biscay; Quantile regression.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00600/71239/69607.pdf

Typologies des flottilles du sud du golfe de gascogne, en 1986, 1989, 1992 et 1995. De Noirmoutier à Bayonne. Description et evolution des composantes de peche
Provedor de dados: 5
Autores: Leaute, Jean-pierre.
This document presents a comparative assessment of four triannual analyses carried out between 1986 and 1995, on 1300 boats, on average, from the 35 ports of Southern Bay of Biscay fishing fleets (from Loire river to Spanish border). Fisheries statistics allow the identification of different fishing practices and fishing boats associated with them within the fleets. In order to allow comparison and analysis of the evolution that has taken place during the study period, the same variables (gear used, landed species) and multivariate analysis procedures have been used to produce groupings of vessels Over the period, an average of 11 components have been identified, grouped in two entities, mobile and fixed gears. If the discriminative characteristics (gears,...
Tipo: Text
Palavras-chave: Caseyeur; Palangrier; Fileyeur; Chalutier; Arts dormants; Arts traînants; Golfe de Gascogne; Flottille; Composante; Segmentation; Typologie; Potter; Longliner; Gillnetter; Trawler; Fixed gear; Mobile gear; Bay of Biscay; Fleet; Component; Grouping; Typologie.
Ano: 2000
URL: https://archimer.ifremer.fr/doc/2000/rapport-1582.pdf

Sole larval supply to coastal nurseries: Interannual variability and connectivity at interregional and interpopulation scales
Provedor de dados: 5
Autores: Savina-, Marie; Lunghi, Mathias; Archambault, B.; Baulier, Loic; Huret, Martin; Le Pape, Olivier.
Simulating fish larval drift helps assess the sensitivity of recruitment variability to early life history. An individual-based model (IBM) coupled to a hydrodynamic model was used to simulate common sole larval supply from spawning areas to coastal and estuarine nursery grounds at the meta-population scale (4 assessed stocks), from the southern North Sea to the Bay of Biscay (Western Europe) on a 26-yr time series, from 1982 to 2007. The IBM allowed each particle released to be transported by currents, to grow depending on temperature, to migrate vertically depending on development stage, to die along pelagic stages or to settle successfully on a nursery, representing the life history from spawning to metamorphosis. The model outputs were analysed to...
Tipo: Text
Palavras-chave: Hydrodynamic model; Individual-based model; Larval supply; Nursery grounds; Recruitment variability; Solea solea; Metapopulation; English Channel; Bay of Biscay; Southern North Sea.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00297/40775/39782.pdf

Scaling of coastal phytoplankton features by optical remote sensors: comparison with a regional ecosystem model
Provedor de dados: 5
Autores: Druon, Jean-noel; Loyer, S; Gohin, Francis.
Different scales of hydrological and biological patterns of the Bay of Biscay are assessed using space-borne and airborne optical remote sensing data, field measurements and a 3-dimensional biophysical model. If field measurements provide accurate values on the vertical dimension, ocean colour data offer frequent observations of surface biological patterns at various scales of major importance for the validation of ecosystem modelling. Although the hydrobiological model of the continental margin reproduces the main seasonal variability of surface biomass, the optical remote sensing data have helped to identify low grid resolution, input inaccuracies and neglect of swell-induced erosion mechanism as model limitations in shallow waters. Airborne remote...
Tipo: Text
Palavras-chave: Bay of Biscay; Models; Scaling; Remote sensing; Satellite observation; Phytoplankton.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-953.pdf

Ecosystem spatial structure revealed by integrated survey data
Provedor de dados: 5
Autores: Petitgas, Pierre; Huret, Martin; Dupuy, Christine; Spitz, Jerome; Authier, Matthieu; Romagnan, Jean-baptiste; Doray, Mathieu.
Integrated marine survey series such as PELGAS provide comprehensive geo-referenced data over large sea areas in major ecosystem components with defined biological resolution and spatio-temporal sampling scale. These data enable to develop product at different levels of biological organization and spatial scale that are useful for ecosystem integrated assessments. Using the PELGAS integrated data series, we applied a generic procedure made of several steps to identify and map ecologically coherent ecosystem spatial units in the Bay of Biscay. First, the data were interpolated on a common spatial grid and organized as a time series of matrices containing at each time the variables as columns and the grid cell values as rows. The multi-table analysis method...
Tipo: Text
Palavras-chave: Integrated surveys; Ecosystems; Spatial structure; Multi-factor analysis; Bay of Biscay; Pelagic.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00403/51402/51977.pdf

Size, permeability and buoyancy of anchovy (     Engraulis Encrasicolus     ) and sardine (     Sardina Pilchardus     ) eggs in relation to their physical environment in the Bay of Biscay
Provedor de dados: 5
Autores: Huret, Martin; Bourriau, Paul; Gatti, Paul; Dumas, Franck; Petitgas, Pierre.
The size and specific gravity of eggs of marine pelagic fish partly determine their dispersal and survival. Using an original dataset of anchovy and sardine eggs, sampled in spring over the last decade in the Bay of Biscay, we provide a parameterization of these properties on ambient water temperature and salinity. We used the density gradient column for measurement of egg specific gravity. The column was also filled with homogeneous water for sinking velocity experiments. For anchovy, these experiments confirm that the effect of egg permeability through the chorion could be neglected when modelling sinking, while it has to be considered for sardine, its perivitelline space representing 78.6% (±6.2%) of the total egg volume, as opposed to 5–10% for most...
Tipo: Text
Palavras-chave: Anchovy; Bay of Biscay; Density gradient column; Egg buoyancy; Egg permeability; Egg size; Sardine.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00346/45676/45326.pdf

Effect of river runoff on sea level from in-situ measurements and numerical models in the Bay of Biscay
Provedor de dados: 5
Autores: Laiz, Irene; Ferrer, Luis; Plomaritis, Theocharis A.; Charria, Guillaume.
Daily time series of in-situ tide gauge records and river runoff data were analysed to investigate the contribution of river discharge storm events to sea level in the Bay of Biscay. Three main river systems were considered for this study, representing cases of small (Nervión, 1900 km2), medium (Adour, 16880 km2) and large (Gironde, 84811 km2) watershed basins. Typical storms correspond to water discharge rates of 150, 700, and 1100 m3 s−1 from the Nervión, Adour, and Gironde rivers, respectively. The effect of these events on daily mean sea level was evaluated using two different approaches: (1) through the analysis of time series of tide gauges placed within the river mouths; and (2) through numerical simulations using the ROMS model (Regional Ocean...
Tipo: Text
Palavras-chave: Bay of Biscay; Sea level; Tide gauges; River discharge; ROMS modelling.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00169/28070/26285.pdf

Modelling the variability in fish spatial distributions over time with empirical orthogonal functions: anchovy in the Bay of Biscay
Provedor de dados: 5
Autores: Petitgas, Pierre; Doray, Mathieu; Huret, Martin; Masse, Jacques; Woillez, Mathieu.
Characterizing the space–time variability in spatial distributions as well as understanding its drivers is basic to designing robust spatial management plans. As a prerequisite, we analyse here how this variability relates to population dynamics in conjunction with environmental conditions. For that, spatio-temporal statistical approaches are needed but seldom used in fisheries science. To fill this gap, we showcase the usefulness of the method of empirical orthogonal functions (EOFs). Guidelines are given to apply the method on a series of gridded maps as derived from fisheries survey dataseries that now span over decades. The method is applied to the series, 2000–2012, of the spatial distributions of European anchovy in the Bay of Biscay at spawning...
Tipo: Text
Palavras-chave: Anchovy; Bay of Biscay; Density-dependence; EOF; Habitat; Spatial distribution.
Ano: 2014
URL: https://archimer.ifremer.fr/doc/00222/33365/31907.pdf

Direct assessment of anchovy by the PELGAS05 acoustic survey
Provedor de dados: 5
Autores: Masse, Jacques; Beillois, Pierre; Duhamel, Erwan.
An acoustic survey was carried out in the bay of Biscay from May 3rd  to June 1st  on board the French research vessel Thalassa. The objective of PELGAS05 survey was to study the abundance and distribution of pelagic fish in the Bay of Biscay. The target species were mainly anchovy and sardine and were considered in a multi-specific context. The results have to be used during ICES working groups in charge of the assessment of sardine, anchovy, mackerel and horse mackerel and in the frame of the Ifremer fisheries ecology program "resources variability".
Tipo: Text
Palavras-chave: Assessment; Bay of Biscay; CUFES; Anchovy; Acoustic; Survey; ICES; PELGAS; Estimation de stock; Golfe de Gascogne; CUFES; Anchois; Acoustique; Campagne oceanographique; CIEM; PELGAS.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/acte-2293.pdf

The impact of aquaculture on the genetics and distribution of the onuphid annelid Diopatra biscayensis
Provedor de dados: 5
Autores: Galaska, Matthew P.; Wethey, David S.; Arias, Andrés; Dubois, Stanislas; Halanych, Kenneth M.; Woodin, Sarah A.
Aim Evolutionary history of natural populations can be confounded by human intervention such as the case of decorator worm species Diopatra (Onuphidae), which have a history of being transported through anthropogenic activities. Because they build tubes and act as ecosystem engineers, they can have a large impact on the overall ecosystem in which they occur. One conspicuous member, Diopatra biscayensis, which was only described in 2012, has a fragmented distribution that includes the Bay of Biscay and the Normanno‐Breton Gulf in the English Channel. This study explores the origin of these worms in the Normanno‐Breton region, which has been debated to either be the result of a historic range contraction from a relic continuous population or a more recent...
Tipo: Text
Palavras-chave: Bay of Biscay; Convex Hull; Onuphidae; Phylogeography; Population genetics; RADseq.
Ano: 2021
URL: https://archimer.ifremer.fr/doc/00692/80411/83522.pdf

Use of SeaWiFS data for light availability and parameter estimation of a phytoplankton production model of the Bay of Biscay
Provedor de dados: 5
Autores: Huret, Martin; Gohin, Francis; Delmas, Daniel; Lunven, Michel; Garcon, Véronique.
Processing SeaWiFS (Sea-viewing Wide Field-of-view Sensor) data provides useful information for the observation and modelling of the phytoplankton production of the Bay of Biscay. Empirical algorithms allow the retrieval of chlorophyll a and non-living Suspended Particulate Matter (SPM) concentrations. These data are used to constrain a coupled 3D physical-biogeochemical model of the Bay of Biscay continental shelf Two issues are investigated, depending on the variable used, to constrain the winter to spring phytoplankton production for the year 2001. First, SPM data is used as forcing data to correct the corresponding state variable of our model. This allows the realistic simulation of the light limited bloom at the end of February 2001, as observed with...
Tipo: Text
Palavras-chave: Bay of Biscay; SeaWiFS; Parameter estimation; Chlorophyll; Suspended Particulate Matter; Physical biogeochemical modelling.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-2493.pdf

The PELGAS survey: ship-based integrated monitoring of the Bay of Biscay pelagic ecosystem
Provedor de dados: 5
Autores: Doray, Mathieu; Petitgas, Pierre; Romagnan, Jean-baptiste; Huret, Martin; Duhamel, Erwan; Dupuy, Christine; Spitz, Jerome; Authier, Matthieu; Sanchez, Florence; Berger, Laurent; Doremus, Ghislain; Bourriau, Paul; Grellier, Patrick; Masse, Jacques.
The Pélagiques Gascogne (PELGAS) integrated survey has been developed by a multidisciplinary team of Ifremer and La Rochelle University scientists since 2000, joined by commercial fishermen in 2007. Its initial focus was to assess the biomass and predict the recruitment success of anchovy in the Bay of Biscay in spring. Taking advantage of the space and versatility of R/V Thalassa II, sampling has been progressively extended to other ecosystem components. PELGAS therefore further developed the second objective of monitoring and studying the dynamic and diverse Biscay pelagic ecosystem in springtime. The PELGAS survey model has allowed for the establishment of a long-term time-series of spatially-explicit data of the Bay of Biscay pelagic ecosystem since...
Tipo: Text
Palavras-chave: Pelagic ecosystem; Integrated ecosystem monitoring survey; Marine Strategy Framework Directive; Ecosystem variability; Bay of Biscay; Fishing vessels.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00407/51801/52401.pdf

Comment la stratégie MMEY atténue les effets bio-économiques du changement climatique dans les pêcheries mixtes
Provedor de dados: 5
Autores: Lagarde, Adrien; Ahad-cisse, Abdoul; Gourguet, Sophie; Le Pape, Olivier; Thebaud, Olivier; Caill-milly, Nathalie; Morandeau, Gilles; Macher, Claire; Doyen, Luc.
This paper examines the effect of climate warming on the bio-economic performance of Bay of Biscay mixed fisheries and provides insights into the best management strategy for coping with global warming. To achieve this, a dynamic multi-species, multi-class, multi-fleets model is developed and calibrated using biological and environmental ICES and IPCC data. Fishing and economic data have been collected within the European DCF. The climate represented by the Sea Surface temperature is assumed to affect species recruitment. Three management strategies are then compared in terms of bio-economic outcomes: Status-Quo (SQ), Multi-species Maximum Sustainable Yield (MMSY), Multispecies Maximum Economic Yield (MMEY). Strategies are ranked with respect to two...
Tipo: Text
Palavras-chave: Bio-économique; Scénarios; Changement climatique; Pêcheries; Soutenabilité; Golfe de Gascogne; Bio-economics; Scenarios; Global warming; Fisheries; Sustainability; Bay of Biscay.
Ano: 2017
URL: https://archimer.ifremer.fr/doc/00637/74884/75282.pdf

Low salinity intrusions in the western English Channel
Provedor de dados: 5
Autores: Kelly Gerreyn, B; Hydes, D; Jegou, Anne-marie; Lazure, Pascal; Fernand, L; Puillat, I; Garcia Soto, C.
Low salinity (&lt; 35) surface waters (LSSW) at the southern entrance to the western English Channel (48.5 degrees N, 5.1 degrees W, near Ushant) were observed in late winter (March-April) in three successive years (2002-04) during near continuous ship of opportunity operations. The source of the LSSW is the northward spreading plumes from the Loire (47.5 degrees N, 2.5 degrees W) and Gironde (45.6 degrees N, 1.2 degrees W) along the French Atlantic coast. Fastest plume travel times were associated with northeasterly winds, consistent with Ekman theory. Differences between years in the mean winter (January-March) combined river discharges (D) was consistent with the minimum salinities (S-min) of the LSSW (2004: D = 4211 m(3) s(-1), S-min = 33.68; 2003: D =...
Tipo: Text
Palavras-chave: Bay of Biscay; English Channel; River plume; Ferrybox; Low salinity.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-3524.pdf

Modélisation bioénergétique de la variabilité des traits d’histoire de vie de l’anchois et de la sardine entre le golfe du Lion, le golfe de Gascogne et la Manche
Provedor de dados: 5
Autores: Menu, Clara.
Small pelagic fish show a general decrease in size and body condition over the past two decades in the North-East Atlantic. The underlying factors are still not well understood, however recent studies point to a bottom-up control. In order to understand how the environment impacts the main biological functions, i.e. growth, reproduction and maintenance, we adopted a bioenergetic modelling framework based on the Dynamic Energy Budget theory. To improve the robustness of our study, we chose a comparative approach between two species, Engraulis encrasicolus and Sardina pilchardus, both living in three areas, namely the English Channel, the Bay of Biscay and the Gulf of Lion. Our model is calibrated over the Bay of Biscay and then applied to the other areas,...
Tipo: Text
Palavras-chave: Engraulis encrasicolus; Sardina pilchardus; Théorie Dynamic Energy Budget; Traits d'histoire de vie; Manche; Golfe de Gascogne; Golfe du Lion; Engraulis encrasicolus; Sardina pilchardus; Dynamic Energy Budget theory; Life history traits; English Channel; Bay of Biscay; Gulf of Lion.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00667/77900/80092.pdf

Poissons et invertébrés au large des côtes de France : Indicateurs issus des pêches scientifiques. Bilan 2002
Provedor de dados: 5
Autores: Bertrand, Jacques; Cochard, Marie-laure; Coppin, Franck; Le Pape, Olivier; Mahe, Jean-claude; Morin, Jocelyne; Poulard, Jean-charles; Rochet, Marie-joelle; Schlaich, Ivan; Souplet, Arnauld; Trenkel, Verena; Verin, Yves.
The scientist community, the fishing organisations and all involved parties show a growing interest in an integrated project management of the sea space exploited by fishing communities. A key to reach such a target is to make available reliable and precise scientist data on the different components of the fishing systems.  For about twenty years, and in its mission to support the development of an integrated management for a sustainable use of marine resources, Ifremer has been organising monitoring campaigns of fishery resources along the shores of France. These campaigns aim at providing abundance indicator on species of interest. They consequently provide an essential knowledge base to characterize and trace the status of exploited fish and...
Tipo: Text
Palavras-chave: Ecosystem; Indicating; Oceanographical campaign; Scientific research; Fishing halieutic; Fishing; English Channel; Bay of Biscay; France; Invertebrate; Pisces; Ecosystème; Indicateur; Campagne océanographique; Recherche scientifique; Pêche halieutique; Pêche; Mer du nord; Golfe de gascogne; Manche; France; Invertebrate; Pisces.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/rapport-1091.pdf

Cartographie synthétique et analyse des peuplements benthiques sur deux secteurs du littoral français "Manche-Est" et "Loire-Gironde"
Provedor de dados: 5
Autores: Blanchard, Michel; Heim, Marie; Rozec, Xavier; Caisey, Xavier.
This document presents a synthetic study of benthos in two large areas of the French coast: East-Channel and the area between Loire and Gironde. This original synthesis stocktakes biotopes maps published for the vast majority in the 70’s. The report uses the previous descriptions and analysis done by the different authors, and translates them with present specific names or biotopes codes, as proposed in the European EUNIS referring system. The presented maps are standardized and referred geographically with WGS84 to be collated together. For each biotope, specific richness and ecological richness are analysed, thanks to the information given by the various authors. Some informative cards of the main representative species are also presented in the...
Tipo: Text
Palavras-chave: Benthos; Peuplement; Cartographie; Littoral français; Manche Est; Bretagne sud; Vendée; Pertuis charentais; Golfe de Gascogne; Benthos; Community; Cartography; French coast; East Channel; Southern Brittany; Vendée; Pertuis charentais; Bay of Biscay.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/00003/11434/7983.pdf

Application d’un protocole de suivi habitat « récifs » au large de la côte basque. Application méthodologique Index-Cor
Provedor de dados: 5
Autores: De Casamajor, Marie-noelle; Lissardy, Muriel.
The purpose of this report is to test a sampling protocol to define a conservation status index for reef habitat in circalittoral environments to characterize benthic populations from surveys at 4 sites located in the Natura 2000 area “côte Basque rocky and extension offshore”. Due to the complexity of this habitat and the gaps in knowledge, an analysis of the protocol and its modalities is necessary. In parallel, optimization proposals are necessary for the relevance of the information provided and for apprehending a possible conservation status.
Tipo: Text
Palavras-chave: Golfe de Gascogne; Circalittoral; Indice; État de conservation; Aires marines protégées; Bay of Biscay; Circalittoral; Conservation index; Marine Protected Area.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00382/49334/50278.pdf

Temperature variability in the Bay of Biscay during the past 40 years, from an in situ analysis and a 3D global simulation
Provedor de dados: 5
Autores: Michel, Sylvain; Treguier, Anne-marie; Vandermeirsch, Frederic.
A global in situ analysis and a global ocean simulation are used jointly to study interannual to decadal variability of temperature in the Bay of Biscay, from 1965 to 2003. A strong cooling is obtained at all depths until the mid-1970's, followed by a sustained warming over similar to 30 years. Strong interannual fluctuations are superimposed on this slow evolution. The fluctuations are intensified at the surface and are weakest at similar to 500 m. A good agreement is found between the observed and simulated temperatures, in terms of mean values, interannual variability and time correlations. Only the decadal trend is significantly underestimated in the simulation. A comparison to satellite sea surface temperature (SST) data over the last 20 years is also...
Tipo: Text
Palavras-chave: Ocean circulation model; Air sea flux; Heat budget; Climatic change; Interannual temperature variability; Bay of Biscay.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6680.pdf