Consulta: subjectFacets:"Gulf of Lions"
Registros recuperados: 50
Data/hora: 06/06/2024 01:48:53

Analysis of gear interactions in a hake fishery: The case of the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Aldebert, Yvonne; Recasens, Laura; Lleonart, Jordi.
The hake of the Gulf of Lions is the most important target species of the demersal fishery. It is exploited by four types of gear (two trawls, gillnet and longline) used by two countries (France and Spain). Some analyses of its dynamics, based on 19 88 length frequency data by gear, have been performed. These analyses consisted in a VPA (Virtual Population Analysis). phis a Y/R (Yield per Recruit analysis) carried out on two parameter scenarios by sex, under a steady state hypothesis (with constant recruitment). Some estimates of biomass and exploitation level were obtained, and sensitivity to the biological parameters and interaction between types of gear were studied. As a main conclusion, it can be seen that the types of gear fishing mainly small...
Tipo: Text
Palavras-chave: Assessment; Gaar interaction; Hake; Gulf of Lions; NW Mediterranean.
Ano: 1993
URL: http://archimer.ifremer.fr/doc/00193/30430/28847.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

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

Determining bluefin tuna habitat through frontal features in the Mediterranean sea
Provedor de dados: 5
Autores: Royer, Francois; Fromentin, Jean-marc; Farrugio, Henri; Gaspar, Philippe.
The distribution patterns of bluefin tuna schools observed during the STROMBOLI EU project (2000-2002) were analysed in relation to oceanographic conditions. High-resolution radiometers (AVHRR and SeaWiFS) were used on a daily basis to derive maps of environmental variability. An edge detection technique was especially applied to estimate the position of frontal features. Using a variety of geostatistical and point process techniques, we were able to show that the distribution of bluefin schools was partially driven by the occurrence of transient fronts in the Gulf of Lions. This is believed to be mainly a trophic association, since enhanced convergence and retention processes occur at fronts, possibly leading to higher prey densities (e.g. anchovies). The...
Tipo: Text
Palavras-chave: Thunnus thynnus; Aerial survey; Gulf of Lions; Sea surface temperature; Ocean colour; Fronts.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/00194/30504/28914.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

Comments on "Shallow gas off the Rhone prodelta, Gulf of Lions" by Garcia-Garcia et al. (2006) Marine Geology 234 (215-231) - Reply
Provedor de dados: 5
Autores: Garcia Garcia, A; Orange, D; Lorenson, T; Radakovitch, O; Tesi, T; Miserocchi, S; Berne, Serge; Friend, P; Nittrouer, C; Normand, Alain.
We really appreciate the interest and comments regarding our manuscript. We hope we address all the lingering issues in this reply. This also gives us the opportunity of publishing an update on our dataset that will complete the original manuscript (see Table 1). We have followed the author pattern in our answers: I-Gas sampling procedure, 2-Reported gas concentrations results, 3-General remarks, 4-Conclusions. (c) 2007 Elsevier B.V. All rights reserved.
Tipo: Text
Palavras-chave: Gulf of Lions; Rhone prodelta; Flood deposits; Biogenic methane; Shallow gas.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-3846.pdf

Echanges côte-large à moyenne échelle au niveau de la pente continentale du Golfe du Lion. Processus et Modélisation
Provedor de dados: 5
Autores: Andre, Gael.
Dynamics of water mass exchanges between the Gulf of Lions (GoL) and the open sea are driven by several physical processes, which influence circulation at several spacio-temporal scales. This study, based on a realistic modelling during two years, aims to bring a better knowledge of circulation and hydrodynamics processes occurring in the NW Mediterranean Sea and in the GoL.  Firstly, the NW Mediterranean Basin circulation modelled during the year 2001 is compared with Sea Surface Temperature (SST) satellite measurements (AVHRR) and with the MEDATLAS climatology. These comparisons show a good agreement concerning surface patterns and seasonal variability of the large scale circulation. At lower scale, several processes influence circulation over the shelf...
Tipo: Text
Palavras-chave: Instabilities; Meso scale variability; Slope current; Hydrodynamical modelling; Gulf of Lions; Mediterranean Sea; Instabilité; Variabilité méso échelle; Courant de pente; Modélisation hydrodynamique; Golfe du Lion; Mer Méditerranée.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-3673.pdf

Paleo sea levels reconsidered from direct observation of paleoshoreline position during Glacial Maxima (for the last 500,000 yr)
Provedor de dados: 5
Autores: Rabineau, Marina; Berne, Serge; Olivet, Jean-louis; Aslanian, Daniel; Guillocheau, François; Joseph, Philippe.
The drastic climatic changes which characterise the cooling trend of the last few million years of Earth history led to variations in eustatic sea level that had tremendous impact on the geology and ecology of continental margins. Reconstructing a sea-level curve back in time is not an easy task. Observations of shoreline positions are always a local measurement of Relative Sea Level that needs to be corrected from the effect of tectonic and thermal subsidence, sediment loading, compaction and glacio-hydro isostasy. Extensive studies have been done for the last deglaciation and for the last 100,000 yr cycle. But very few studies deal with position of sea level during earlier cycles, simply because conditions are very rarely favourable for the preservation...
Tipo: Text
Palavras-chave: Mediterranean Sea; Gulf of Lions; Golfe du Lion; Subsidence; Glacial maxima; Climatic cycles; Shoreline position; Glacioeustatism; Sea level amplitudes; Sea level changes.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2253.pdf

Interactions entre pêcheries de lagunes, pêcheries côtières et pêche au chalut dans le golfe du Lion
Provedor de dados: 5
Autores: Farrugio, Henri; Le Corre, Gildas.
INTRODUCTION : This document is the final report concerning a study led on interactions between lagoon fisheries, coastal fisheries and trawl fishing in the Lion gulf.  If any of the three components mentioned above is able to catch species of interest (or none) to the other groups, other ones are of interest to at least two components. Furthermore, within each group, interactions between various fleet and/or trade can exist.  Interactions are more complex on account of the specific diversity of catches. If until 1984, trawler fleets were the subject of continuous studies, lagoon and coastal fleets were only considered on a one off basis... The goal of the work led by IFREMER concerning Mediterranean halieutic resources aims at obtaining basic elements...
Tipo: Text
Palavras-chave: Gulf of Lions; Trawling; Inshore fisheries; Fisheries of lagoons; Le golfe du Lion; Pêche au chalut; Pêcheries côtières; Pêcheries de lagunes.
Ano: 1986
URL: http://archimer.ifremer.fr/doc/1986/rapport-1655.pdf

Constraining the origin of recently deposited particles using natural radionuclides 7 Be and 234 Th ex in deltaic sediments
Provedor de dados: 5
Autores: Wu, Junwen; Rabouille, Christophe; Charmasson, Sabine; Reyss, Jean Louis; Cagnat, Xavier.
7Be and 234Thex activities were determined in sediment cores off the Rhône River mouth (Gulf of Lions), in order to trace the initial transport and deposition of riverine suspended particulate matter (SPM) and evaluate the impact of flood events through 7 cruises carried out between 2007 and 2008. Consistently high 7Be and 234Thex inventories of 2000–3000 mBq cm−2 and 3000–5000 mBq cm−2, respectively, were observed within a ~5 km radius off the Rhône River mouth. Their spatial distributions showed a gradual decrease with increasing distance from the Rhône River mouth, and the decrease in 7Be was more pronounced than that of 234Thex, indicating that recent riverine SPM is rapidly deposited in the area located near the river mouth. This area is also...
Tipo: Text
Palavras-chave: Be-7; Th-234; Suspended particulate matter; Rhone River; 2008 flood; Gulf of Lions.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00445/55628/73535.pdf

Investigating Rhône River plume (Gulf of Lions, France) dynamics using metrics analysis from the MERIS 300m Ocean Color archive (2002 − 2012)
Provedor de dados: 5
Autores: Gangloff, Aurelien; Verney, Romaric; Doxaran, David; Ody, Anouck; Estournel, Claude.
In coastal environments, river plumes are major transport mechanisms for particulate matter, nutriments and pollutants. Ocean colour satellite imagery is a valuable tool to explore river turbid plume characteristics, providing observations at high temporal and spatial resolutions of suspended particulate matter (SPM) concentration over a long time period, covering a wide range of hydro-meteorological conditions. We propose here to use the MERIS-FR (300 m) Ocean Colour archive (2002–2012) in order to investigate Rhône River turbid plume patterns generated by the two main forcings acting on the north-eastern part of the Gulf of Lions (France): wind and river freshwater discharge. Results are exposed considering plume metrics (area of extension,...
Tipo: Text
Palavras-chave: River plume metrics; Sediment dynamics; MERIS; Ocean color data; Suspended particulate matter; Gulf of Lions.
Ano: 2017
URL: http://archimer.ifremer.fr/doc/00391/50258/50885.pdf

Caractérisation et modélisation des processus de bioaccumulation des PCB chez le merlu (Merluccius merluccius) du golfe du Lion
Provedor de dados: 5
Autores: Bodiguel, Xavier.
Understanding bioaccumulation mechanisms of persistent organic pollutants (POPs) is a major issue for environmental risk assessment. In this work, polychlorinated biphenyls (PCBs), a model contaminant family, has been studied in the European hake (Merluccius merluccius), a high trophic level species from the Gulf of Lions. High concentrations of PCBs were measured in hake from this area compared to those encountered in the population of the Bay of Biscay. PCB biomagnification was highlighted along its food web from marine phytoplankton, suggesting a strong influence of diet on contamination levels. The role of other biological processes was also apprehended in order to understand the high variability of observed levels. Thus, growth, sex, and also the...
Tipo: Text
Palavras-chave: DEB theory; Bioenergetic model; Gulf of Lions; Biomagnification; Food web; Hake; Bioaccumulation; Polychlorinated biphenyls; Organic contaminants; Théorie DEB; Modèle bioenergétique; Golfe du Lion; Bioamplification; Réseau trophique; Merlu; Bioaccumulation; Polychlorobiphényles; Contaminants organiques.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6490.pdf

Biomass, metabolism and nutrition of zooplankton in the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Gaudy, R; Youssara, F; Diaz, F; Raimbault, P.
Zooplankton biomass was measured at 20 stations located along five coastal-offshore transects in the Gulf of Lions (NW Mediterranean) during spring 1998 and winter 1999, using two nets equipped with 200 and 80 Pm mesh. Biomass was twice as abundant in spring. It increased toward the coast and the west of the gulf and was positively correlated to chlorophyll, primary production and organic particulate matter and negatively to temperature and salinity. The enrichment effect of Rhone river input and the oligotrophic influence of the north Mediterranean current (NMC) were the main distribution factors of zooplankton biomass. Higher biomass was obtained in coastal stations with the 80 mum net, which sampled more efficiently young larval stages and nauplii....
Tipo: Text
Palavras-chave: Zooplankton; Métabolisme; Cycle saisonnal; Golfe du Lion; Zooplankton; Metabolism; Seasonal cycle; Gulf of Lions.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00321/43262/42993.pdf

Association between bluefin tuna schools and oceanic features in the western Mediterranean
Provedor de dados: 5
Autores: Royer, Francois; Fromentin, Jean-marc; Gaspar, P.
We present an analysis of the distribution of bluefin tuna Thunnus thynnus schools spotted during aerial surveys in the Gulf of Lions, in relation to oceanographic features. Bio-optical and thermal properties of the sea surface derived from high-resolution sensors (AVHRR and SeaWiFS) were studied on a daily basis, and an edge-detection technique was applied to detect frontal zones. Geostatistics and point-process analyses were used to evaluate the role of the environment in structuring the spatial pattern of bluefin tuna (BFT). The distribution of schools spotted was strongly non-stationary both in space and time; this is believed to be an effect of the survey design (transect sampling) and the influence of transient oceanographic structures (surface...
Tipo: Text
Palavras-chave: Thunnus thynnus; Gulf of Lions; Point process analysis; Front detection; Sea surface temperature; Ocean colour; Aggregation.
Ano: 2004
URL: http://archimer.ifremer.fr/doc/00000/10786/7585.pdf

Aerial surveys to monitor bluefin tuna abundance and track efficiency of management measures
Provedor de dados: 5
Autores: Bauer, Robert; Bonhommeau, Sylvain; Brisset, Blandine; Fromentin, Jean-marc.
Conservation and management measures for exploited fish species rely on our ability to monitor variations in population abundance. In the case of the eastern stock of Atlantic bluefin tuna (ABFT), recent changes in management policies have strongly affected the reliability of fishery-dependent indicators due to drastic changes in fishing season/area, fisheries selectivity and strategy. However, fishery-independent indices of abundance are rare for large pelagic fish, and obtaining them is often costly and labor intensive. Here, we show that scientific aerial surveys are an appropriate tool for monitoring juvenile bluefin tuna abundance in the Mediterranean. We present an abundance index based on 62 aerial surveys conducted since 2000, using 2 statistical...
Tipo: Text
Palavras-chave: Thunnus thynnus; Index of abundance; Fishery-independent; Gulf of Lions; Mediterranean Sea; Strip transect; Distance sampling.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00281/39192/45096.pdf

Particulate matter and organic carbon budgets for the Gulf of Lions (NW Mediterranean)
Provedor de dados: 5
Autores: Durrieu De Madron, X; Abassi, A; Heussner, S; Monaco, A; Aloisi, Jc; Radakovitch, O; Giresse, P; Buscail, R; Kerherve, P.
An analysis of sedimentological, sediment trap and hydrological data was performed to investigate the transport and fate of particulate matter in the Gulf of Lions. The sedimentological properties outline the major sedimentary units of the shelf (Rhone prodelta, mid-shelf mud belt, outer shelf) and slope. The geometry of these sedimentary units and the southwestwards increase of particulate fluxes on the slope highlight the influence of the general cyclonic circulation on the dispersion of land-derived particulate matter. Considering the known input and output terms, budgets of particulate matter and organic carbon in the Gulf of Lions are proposed. Inputs were river supply, atmospheric deposition and primary production; outputs were sediment burial and...
Tipo: Text
Palavras-chave: Méditerranée; Golfe du Lion; Sédiment; Flux; Bilans de masse et de carbone organique; Mediterranean Sea; Gulf of Lions; Sediment; Flux; Organic carbon and mass budgets.
Ano: 2000
URL: http://archimer.ifremer.fr/doc/00301/41210/40366.pdf

Trophic structure in the Gulf of Lions marine ecosystem (north-western Mediterranean Sea) and fishing impacts
Provedor de dados: 5
Autores: Banaru, Daniela; Mellon, Capucine; Roos, David; Bigot, Jean-louis; Souplet, Arnauld; Jadaud, Angelique; Beaubrun, P.; Fromentin, Jean-marc.
The Gulf of Lions ecosystemwas described using the Ecopath mass-balancemodel to characterise its structure and functioning and to examine the effects of themultispecific fisheries operating in this area. The model is composed of 40 compartments, including 1 group of seabirds, 2 groups of etaceans, 18 groups of fish, 12 groups of invertebrates, 5 groups of primary producers, detritus and discards. Input datawere based on several recurrent scientific surveys, two alternative datasets for fishing data, stock assessment outputs, stomach content analyses and published information. Results showed that the functional groups were organised into five trophic levels with the highest one represented by dolphins, anglerfish, Atlantic bluefin tuna, European hake and...
Tipo: Text
Palavras-chave: Gulf of Lions; Ecopath with Ecosim; Food web; Fishing impacts.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00116/22758/20614.pdf

Enregistrements stratigraphiques des cycles climatiques et eustatiques du Quaternaire terminal - Modélisations de la marge continentale du Golfe du Lion.
Provedor de dados: 5
Autores: Jouet, Gwenael.
Earth's climate oscillated during the Late Quaternary following the major glacial-interglacial cycles. These well-known variations influenced continental and marine sedimentary records worldwide. However, the associated changes of global sea-level and of environmental factors are not precisely documented, neither are their stratigraphic signatures. The extensive geophysical and sedimentological investigations carried out in the Gulf of Lions (Western Mediterranean) since the early 90's allow us to explore the expanded sedimentary records preserved on this continental margin during the Late Quaternary. The combination of high sediment supply (largely from Alpine glaciers) and significant subsidence favoured an almost continuous record, at the shelf edge, of...
Tipo: Text
Palavras-chave: Late Quaternary; Lithology; Seismic; Gulf of Lions; Stratigraphic modelling; Glacio Eustatic cycles; Climate; Deltaic margin; Sequence Stratigraphy; Quaternaire terminal; Lithologie; Sismique; Golfe du Lion; Modélisations stratigraphiques; Cycles Glacio Eustatiques; Climat; Marge deltaïque; Stratigraphie Séquentielle.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/these-3692.pdf

Evolution of rifted continental margins: The case of the Gulf of Lions (Western Mediterranean Basin)
Provedor de dados: 5
Autores: Bache, Francois; Olivet, Jean-louis; Gorini, Christian; Aslanian, Daniel; Labails, Cinthia; Rabineau, Marina.
The formation of rifted continental margins has long been explained by numerous physical models. However, field observations are still lacking to validate or constrain these models. This study presents major new observations on the broad continental margin of the Gulf of Lions, based on a large amount of varied data. Two contrasting regions characterize the thinned continental crust of this margin. One of these regions corresponds to a narrow rift zone (40–50 km wide) that was highly thinned and stretched during rifting. In contrast with this domain, a large part of the margin subsided slowly during rifting and then rapidly after rifting. The thinning of this domain cannot be explained by stretching of the upper crust. We can thus recognize a zonation of...
Tipo: Text
Palavras-chave: Subsidence; Passive margins; Back-arc; Rifting; Erosion; Stretching; Thinning; Western Mediterranean; Gulf of Lions.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00001/11230/7736.pdf

Response of the Rhone deltaic margin to loading and subsidence during the last climatic cycle
Provedor de dados: 5
Autores: Jouet, Gwenael; Hutton, E; Syvitski, J; Berne, Serge.
Passive continental margin subsidence is initiated by the synrift mechanical stretching of the lithospheric upper brittle layer and continues during the postrift phase; the thermal cooling and contraction of the upwelled asthenosphere forces the margin to subside in addition to the overloads from sea water and sediments. Therefore, the total subsidence in stretched basins includes fault-controlled initial sinking, thermal subsidence and flexural isostatic compensations. Decoupling and estimating the different components of this subsidence from stratigraphic analysis and restricted geophysical and sedimentological databases remains problematic. In particular, backstripping the sediment layers requires a well-constrained geological framework. A method is...
Tipo: Text
Palavras-chave: Gulf of Lions; Continental shelf; Sedflux; Stratigraphic simulations; Isostasy; Subsidence.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-4640.pdf

Mesoscale slope current variability in the Gulf of Lions. Interpretation of in-situ measurements using a three-dimensional model
Provedor de dados: 5
Autores: Andre, Gael; Garreau, Pierre; Fraunie, Philippe.
The ECOLOPHY experiments aimed at investigating physical exchanges between coastal and open sea. They were carried out in June and December 2005 over the shelf-break in the North-eastern part of the Gulf of Lions (Northwestern Mediterranean Sea). This area is considered to be the generation zone for the eddy and meandering structures of the Northern Current (NC). The objective of the present work is to examine mesoscale variability of this coastal slope current in the light of available data. Numerical modeling is used to support the field data analysis. ADCP current measurements over a one-year period show that mesoscale activity is maximal in late winter, correlating with the seasonal variability of the NC and, also, partly with local winds, Measured...
Tipo: Text
Palavras-chave: Numerical modeling; Mesoscale variability; Slope Current; Northern Current; Gulf of Lions; Northwestern Mediterranean Sea.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6461.pdf

Radionuclide deposition in the Rhone River Prodelta (NW Mediterranean sea) in response to the December 2003 extreme flood
Provedor de dados: 5
Autores: Miralles, Jérôme; Arnaud, M; Radakovitch, O; Marion, C; Cagnat, X.
The extreme Rhone River flood that peaked in early December 2003 with water discharges as high as 11,500 m(3) s(-1), induced major damage in southern France and transferred large amounts of radionuclides that were associated with suspended particulate matter such as Be-7, Cs-137 and Pb-210. Specific marine locations in the close vicinity of the Rhone River Mouth were sampled three times in December 2003, February 2004 and April 2004 in order to quantify the consequences of flood events in the Rhone River Prodelta and to investigate the sedimentary depositional patterns through time. The Pb-210(xs) profile analyses in sediment revealed the existence of two particulate matter inputs, one that was related to the December extreme flood and the other to a peak...
Tipo: Text
Palavras-chave: Gulf of Lions; Rhone River Prodelta; Extreme flood; Radionuclide deposition.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2273.pdf

Modélisation du transport particulaire dans le Golfe du Lion en vue d'une application au devenir des traceurs radioactifs issus du Rhône
Provedor de dados: 5
Autores: Dufois, Francois.
Among the contaminants introduced into the environment, the artificial radionuclides appear particularly important to take into account because of their chemical toxicity and/or of their radiotoxicity. Some radionuclides present a high affinity with particles so that the study of the sediment dynamics is a useful preliminary to the study of their dispersion on the open sea. This thesis is focused on the fate of sediments in the Gulf of Lions (NW Mediterranean) and in particular on the impact of the Rhone River, which is the main source of particulate matter in the Gulf of Lions. In order to study the sediment transport mechanisms on various space and time scales, this thesis is based on mathematical modelling. The hydro-sedimentary model set up in the Gulf...
Tipo: Text
Palavras-chave: Waves; MARS 3D; Hydrodynamic; Radionuclides; Modelling; Sediment; Rhône prodelta; Gulf of Lions; Vagues; MARS 3D; Hydrodynamique; Radioéléments; Modélisation; Sédiment; Prodelta du Rhône; Golfe du Lion.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/these-6308.pdf

Preliminary results of aerial surveys of bluefin tuna in the western Mediterranean sea
Provedor de dados: 5
Autores: Fromentin, Jean-marc; Farrugio, Henri; Deflorio, Michèle; De Metrio, Gregorio.
One of the aims of the EU project STROMBOLI (2000-2002) was to conduct an aerial survey for bluefin tuna in the western Mediterranean Sea to test the feasibility of computing an index of abundance from direct observation. This approach has at least two advantages: (i) to provide fishery-independent information and observation, and (ii) to compensate for the lack of Mediterranean purse seine CPUE indices. The first surveys were done in June-July 2000 over the Balearic and Sicilian areas, where and when adult bluefin tuna used to concentrate for spawning, but the results were disappointing (spawners can hardly be detected from a plane). In contrast, the results obtained from the surveys for juveniles of BFT in the Gulf of Lions and in the Ligurian and...
Tipo: Text
Palavras-chave: Atlantic bluefin tuna; Aerial survey; Index of abundance; Gulf of Lions; Ligurian and Tyrrhenian Sea.
Ano: 2003
URL: http://archimer.ifremer.fr/doc/00194/30531/28949.pdf

Fluctuations of landings and environmental conditions in the north-western Mediterranean Sea
Provedor de dados: 5
Autores: Lloret, J; Lleonart, J; Sole, I; Fromentin, Jean-marc.
Most of the monthly catches and CPUE of 13 studied commercial species in the coastal waters of the north-western Mediterranean were significantly positively correlated with run-off of local rivers (Rhone and Muga) and the wind mixing index during the spawning season, with time lags of less than a year (transfer function analyses). Rhone and Ebre interannual fluctuations in run-off were synchronous and were related to the North Atlantic Oscillation (NAO), river run-offs being negatively correlated to high NAO episodes. The fluctuations of river discharges and the wind mixing index were cyclic but not related. The results showed that enhanced hydroclimatic conditions in the NW Mediterranean were favourable for the productivity of the fish and invertebrate...
Tipo: Text
Palavras-chave: Wind; Rhone River; NAO index; Muga River; Mediterranean fisheries; Gulf of Roses Cape Creus; Gulf of Lions; Ebre River; Box Jenkins models.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/publication-672.pdf

The Gulf of Lions: An overview of recent studies within the French 'Margins' Programme
Provedor de dados: 5
Autores: Berne, Serge; Gorini, C.
Within the French 'Margins' Programme (Groupement de Recherches 'Marges', or 'GDR Marges'), The Gulf of Lions was selected as a key area where scientists specialized in complementary aspects of geosciences (structural geology, tectonics, stratigraphy, sedimentology, various aspects of modeling) work together in order to better understand the processes that control the formation and evolution of continental margins. A key objective was to link offshore data (that mainly consist of seismic data and few wells) and onshore studies (mainly based on well and field data). This special edition of Marine and Petroleum Geology on the Gulf of Lions presents some of the main results obtained during three years of research by the group 'GDR Marges-Golfe du Lion'.
Tipo: Text
Palavras-chave: Modeling; Geosciences; 'Margins' Programme; Gulf of Lions.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-728.pdf

Programme pilote de gestion halieutique : groupe de propositions sur l'organisation de la gestion des pêches dans le golfe du Lion
Provedor de dados: 5
Autores: Bertrand, Jacques; Catanzano, Joseph; Caboche, C; Rey, Hélène; Tempier, E.
Le début de la décennie 1990 a été marqué par la volonté des responsables nationaux et communautaires de faire évoluer les modalités de la gestion des pêches en Méditerranée. L'objectif du présent projet était de contribuer à cette dynamique par une analyse sur le fonctionnement de la pêche à partir de l'exploitation elle-même, à l'échelle de la zone du golfe du Lion. Le projet visait également à proposer, toujours à l'échelle de la zone étudiée, des voies d'évolution en vue d'un renforcement de la participation des professionnels à la gestion des pêches régionales dans le contexte communautaire. Le programme a été réalisé dans le cadre d'une collaboration entre une organisation professionnelle (le Comité national des pêches maritimes et des élevages...
Tipo: Text
Palavras-chave: Golfe du Lion; Méditerranée; Recherche action; Gestion des pêches; Gulf of Lions; Méditerranée; Seek action; Management of fishings.
Ano: 1994
URL: https://archimer.ifremer.fr/doc/1994/rapport-1658.pdf

Facteurs de contrôle sur le fonctionnement du système turbiditique du Rhône depuis le Dernier Maximum Glaciaire
Provedor de dados: 5
Autores: Lombo Tombo, Swesslath.
Turbidite systems are accumulations of fluvial sediment on the continental margins. They are mainly made of « turbidites » deposited after the flow of turbidity currents inside submarine canyons and channels. Their structure and composition are controlled by global and regional environmental changes such as sea level and climate. The two fundamental parameters that govern their functioning are the production of sediment in the river watersheds and the capability and reactivity of the transfer to the turbidite system. In this work we show that for the last 24,000 years the functioning of the Rhone turbidite system has shown rapid changes under the control of sea level and sediment production fluctuations. Our results are based on a millennial time-scale...
Tipo: Text
Palavras-chave: Hyperpycnite; Turbidites; Système turbiditique du Rhône; Facteurs de contrôle; Niveau marin; Climat; Morphologie; Golfe du Lion; Méditerranée occidentale; Hyperpycnites; Turbidites; Rhone turbidite system; Control factors; Sea level; Climate; Morphology; Gulf of Lions; Western Mediterranean.
Ano: 2015
URL: http://archimer.ifremer.fr/doc/00274/38505/37013.pdf

Particle assemblage characterization in the Rhone river ROFI
Provedor de dados: 5
Autores: Many, Gael; Bourrin, Francois; Durrieu De Madron, Xavier; Pairaud, Ivane; Gangloff, Aurelien; Doxaran, David; Ody, Anouck; Verney, Romaric; Menniti, Christophe; Le Berre, David; Jacquet, Matthias.
An innovative experiment was carried out in the vicinity of the Rhône River mouth in February 2014. An instrumental package, composed of a CTD, a LISST-100 type B (1.25–250 μm) and a LISST-HOLO (20–2000 μm), was used to characterize the hydrological parameters and suspended particles properties (concentration, size, composition, shape and effective density) in the region of freshwater influence (ROFI) of the Rhône River. Besides, a coastal SLOCUM glider, equipped with a CTD and optical backscattering sensors at several wavelengths, was deployed to detail the spatial description of the hydrological parameters and some particle properties. Large river discharge (annual flood ~ 5000 m3 s− 1) and strong wind conditions favored the dispersal of the river plume...
Tipo: Text
Palavras-chave: Gulf of Lions; Rhone River; ROFI; Turbid structures; Particle properties; Glider.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00307/41809/41011.pdf

Major modification of sediment routing by a large Mass Transport Deposit in the Gulf of Lions (Western Mediterranean)
Provedor de dados: 5
Autores: Dennielou, Bernard; Jegou, I.; Droz, Laurence; Jouet, Gwenael; Cattaneo, Antonio; Berné, Serge; Aslanian, Daniel; Loubrieu, Benoit; Rabineau, Marina; Bermell, Sylvain.
In the Gulf of Lions (Western Mediterranean), the emplacement of a large (160 km3) Mass Transport Deposit, the Rhone Western Mass Transport Deposit (RWMTD), at the base of slope, aside the Rhone deep-sea fan between 1800 and 2700 m water depth, resulted in a major modification of the sediment routing by clogging a drainage network and blocking at the base of slope sediments that were previously routed into the Valencia channel and the Balearic abyssal plain. The RWMTD was sourced from sediments of the western flank of the Rhone upper fan and the adjacent base of slope. The mass transport deposit is characterized by a transparent seismic facies and sediment cores show that it is composed of a stiff laminated muddy lithofacies characteristic of the Rhone fan...
Tipo: Text
Palavras-chave: Gulf of Lions; Ebro margin; Sediment routing; Rhone deep-sea fan; Canyon; Mass transport deposit; Turbidite.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00480/59175/61813.pdf

Messinian erosional and salinity crises: View from the Provence Basin (Gulf of Lions, Western Mediterranean)
Provedor de dados: 5
Autores: Bache, Francois; Olivet, Jean-louis; Gorini, Christian; Rabineau, Marina; Baztan, Juan; Aslanian, Daniel; Suc, Jean-pierre.
Though the late Miocene "Messinian Salinity Crisis" has been intensely researched along the circum-Mediterranean basins, few studies have focused on the central part of the Mediterranean Basin and, especially, the pre-salt deposits. To improve our knowledge of the Messinian events, it is imperative to better understand this domain. In this study, we provide a more complete understanding of this central domain in the Provence Basin. We were able to recognize: a) thick marine detrital series (up to 1000 m) derived from the Messinian subaerial erosion which is partly prolongated in the distal part by b) a thick unit of deep marine deposits (up to 800 m) prior to the evaporites; c) a thick presumed alternation of detritals and evaporites (1500 m) below the...
Tipo: Text
Palavras-chave: Erosion; Detrital deposits; Miocene; Provence Basin; Mediterranean; Gulf of Lions; Salinity Crisis; Messinian.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-6870.pdf

Wave- and current-induced bottom shear stress distribution in the Gulf of Lions
Provedor de dados: 5
Autores: Dufois, Francois; Garreau, Pierre; Le Hir, Pierre; Forget, P.
Simulations of both currents and waves were performed throughout the year 2001 to assess the relative contribution of each to their overall erosive potential on the Gulf of Lions shelf. Statistical analysis of bottom shear stress (BSS) was compared to sediment grain-size distribution on the bottom. The hydrodynamic features of the bottom layer coincide with the distribution of surficial sediments, and three areas with different hydro-sedimentary characteristics were revealed. (i) The sandy inner shelf ( &lt; 30 m) area is a high-energy-wave dominated area but may be subjected to intense current-induced BSS during on-shore winds along the coast and during continental winds mainly in the up-welling cells. (ii) The middle shelf (30-100 m) is a low-energy...
Tipo: Text
Palavras-chave: Gulf of Lions; 3D modelling; Bottom shear stress; Sediment transport.
Ano: 2008
URL: http://archimer.ifremer.fr/doc/2008/publication-6305.pdf

The fisheries history of small pelagics in the Northern Mediterranean
Provedor de dados: 5
Autores: Van Beveren, Elisabeth; Fromentin, Jean-marc; Rouyer, Tristan; Bonhommeau, Sylvain; Brosset, Pablo; Saraux, Claire.
Since 2007, the biomass of sardine and anchovy in the NW Mediterranean has remained persistently low, whereas the biomass of the commercially low-valued sprat has exploded. Also, simultaneous decreases in condition, size, and/or age of these populations were observed. Altogether, this resulted in a drop in landings of small pelagics. To understand the amplitude of these events and to provide a baseline scenario against which current changes can be compared, we compiled exceptionally long landing series (1865–2013) of sardine, anchovy, and mackerel for different subregions of the southern French coast. We characterized the fluctuations of these landings and compared these with environmental drivers (sea surface temperature, Rhône river discharge, North...
Tipo: Text
Palavras-chave: Anchovy; Fish landings; Gulf of Lions; Historical time series; Mackerel; Sardine.
Ano: 2016
URL: https://archimer.ifremer.fr/doc/00319/43001/42561.pdf

The penetration of the Northern Current over the Gulf of Lions (Mediterranean) as a downscaling problem
Provedor de dados: 5
Autores: Auclair, F; Marsaleix, P; Estournel, C.
Coastal shelf models suffer from the difficulty of specifying both the initial field and the external circulation at the open boundary. Only basin scale models can have the right space-time variability to routinely provide such information. Do facto, such models have however a coarser resolution than the coastal model and the downscaling of the circulation to the high resolution grid is biased. Indeed the models are not necessarily based on the same physics and the interactions of the general circulation with the topography, in particular over the shelf break region, arc generally not correctly represented on the large-scale grid. Studying the response of the Northern Current to the atmospheric forcing in the region of Marseille (France) and its...
Tipo: Text
Palavras-chave: Courant Nord; Golfe du Lion; Initialisation variationnelle; Cascade d’échelles; Talus continental; Northern Current; Gulf of Lions; Variational initialization; Downscaling; Continental shelf break.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00322/43330/42897.pdf

Stable isotopes (C-13/C-12 and N-15/N-14) in settling organic matter of the northwestern Mediterranean Sea: biogeochemical implications
Provedor de dados: 5
Autores: Kerherve, P; Minagawa, M; Heussner, S; Monaco, A.
Within the framework of the High Frequency Flux (HFF) experiment (MATER programme), time-series sediment traps have been deployed for two months on the continental slope off Marseilles to measure downward particle fluxes at a high frequency sampling rate (two and six days). Combined isotopic analyses of carbon and nitrogen have been performed on selected samples. Both isotopic tracers have been used for the first time on organic material of the Mediterranean Sea (Gulf of Lions) to determine the main biological sources and to address the biogeochemical processes that affected this material. Settling particles were characterised by very low values of delta N-15 (near 0 parts per thousand) and delta C-13 (near -24.5 parts per thousand) that indicate the...
Tipo: Text
Palavras-chave: Isotopes stables; Traceurs isotopiques; Particules en sédimentation; Fixation d’azote; Golfe du Lion; Stable isotopes; Isotopic tracers; Settling particles; Nitrogen fixation; Gulf of Lions.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/00289/40019/38609.pdf

Variability of PCB burden in 5 fish and sharks species of the French Mediterranean continental slope
Provedor de dados: 5
Autores: Cresson, Pierre; Fabri, Marie-claire; Miralles, Francoise Marco; Dufour, Jean-louis; Elleboode, Romain; Sevin, Karine; Mahe, Kelig; Bouchoucha, Marc.
Despite being generally located far from contamination sources, deep marine ecosystems are impacted by chemicals like PCB. The PCB contamination in five fish and shark species collected in the continental slope of the Gulf of Lions (NW Mediterranean Sea) was measured, with a special focus on intra- and interspecific variability and on the driving factors. Significant differences occurred between species. Higher values were measured in Scyliorhinus canicula, Galeus melastomus and Helicolenus dactylopterus and lower values in Phycis blennoides and Lepidorhombus boscii. These differences might be explained by specific abilities to accumulate and eliminate contaminant, mostly through cytochrome P450 pathway. Interindividual variation was also high and no...
Tipo: Text
Palavras-chave: Bioaccumulation; Continental slope; Gulf of Lions; PCB.
Ano: 2016
URL: http://archimer.ifremer.fr/doc/00313/42421/41790.pdf

Sand bodies at the shelf edge in the Gulf of Lions (Western Mediterranean): Deglacial history and modern processes
Provedor de dados: 5
Autores: Bassetti, Maria-angela; Jouet, Gwenael; Dufois, Francois; Berne, Serge; Rabineau, Marina; Taviani, M.
The outer continental shelf of the Gulf of Lions is covered by thick, mainly regressive, sand deposits. A combination of seismic, sedimentological and geochronological methods allows us to demonstrate that a veneer of transgressive sand bodies, few m to less than 1 m thick, reworks these deposits. They take the form of sand ridges and transverse dunes that formed at different periods. In fact, the low-gradient outer shelf of the Gulf of Lions displays a complete record of deglacial history, including not only transgressive deposits that formed during sea-level rise, but also bedfonns that still evolve under episodic high-energy events that occur under more highstand conditions. Core lithology, C-14 dates and regional sea-level curve suggest that the...
Tipo: Text
Palavras-chave: Gulf of Lions; Sand transport; Deglacial transgression; Outer shelf; Sand ridges.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2321.pdf

Comparison of three Gobiidae (Teleostei) life history strategies over their geographical range
Provedor de dados: 5
Autores: Bouchereau, Jl; Guelorget, O.
This article summarizes the latest knowledge on the ecology of three gobies. The authors compile data published by various scientists who carried out their research under different conditions, using a variety of methods for collecting data and processing the results. The relationship between population structure and different environmental conditions was considered for three goby species Pomatoschistus minutus (Pallas, 1770), P. microps (Kroyer, 1838) and Gobius niger Linnaeus, 1758, in different geographical areas, notably the Mediterranean (Gulf of Lions and Adriatic) and cold temperate Atlantic (north of the English Channel) parts. In the three species, the life cycles in the Mediterranean, favoured by the local hydroclimate, are "contracted" (growth is...
Tipo: Text
Palavras-chave: Golfe du Lion; Atlantique; Cycles vitaux; Stratégies d'occupation; Gobiidæ; Gulf of Lions; Atlantic; Life cycle; Occupying strategy; Gobiidae.
Ano: 1998
URL: http://archimer.ifremer.fr/doc/00326/43672/43198.pdf

Impact of winter storms on sediment erosion in the Rhone River prodelta and fate of sediment in the Gulf of Lions (North Western Mediterranean Sea)
Provedor de dados: 5
Autores: Dufois, Francois; Verney, Romaric; Le Hir, Pierre; Dumas, Franck; Charmasson, Sabine.
In this study a three-dimensional sediment transport model was developed. The model accounts for both current and wave forcing on the sediment and was implemented over the Gulf of Lions. A two-way nesting technique was used to focus on the Rhone River prodelta which is considered as a sink for riverine sediment. In addition, to understand the resuspension of trapped sediment over the Rhone prodelta, an in situ experiment, called SCOPE, was conducted during the winter 2007/2008. The experiment consisted of measuring hydro-sedimentary parameters using a mooring station comprising a current profiler (ADCP) and an altimeter (acoustic transducer) located in the eastern part of the Rhone prodelta. The three-dimensional transport model was validated using these...
Tipo: Text
Palavras-chave: Sediment transport; Gulf of Lions; Rhone prodelta; 3D modelling; ADCP; ALTUS.
Ano: 2014
URL: http://archimer.ifremer.fr/doc/00165/27584/25743.pdf

Can satellite-derived chlorophyll imagery be used to trace surface dynamics in coastal zone? A case study in the northwestern Mediterranean Sea
Provedor de dados: 5
Autores: Forget, Philippe; Andre, Gael.
A comparison of chlorophyll data from SeaWiFS imagery and modeling results from a 3D hydrodynamical model was performed over the northwestern Mediterranean for the entire year of 2001. The study aims at investigating the information content brought by satellite-derived chlorophyll concentration ([Chl]) maps concerning surface dynamics in coastal zone. The study is mainly focused on the Gulf of Lions (GoL) and its outer region, which are mainly influenced by the Rh ne River, local winds and the Northern Current (NC) flowing from the East along the continental slope. The physical hydrodynamical model was continuously run and 40 SeaWiFS images, presenting a significant coverage of the studied area, were selected. The comparison between [ Chl] and sea surface...
Tipo: Text
Palavras-chave: MARS hydrodynamical model; Surface chlorophyll; SeaWiFS; Gulf of Lions.
Ano: 2007
URL: http://archimer.ifremer.fr/doc/2007/publication-6205.pdf

Modelling for anchovy recruitment studies in the Gulf of Lions (Western Mediterranean Sea)
Provedor de dados: 5
Autores: Nicolle, Amandine; Garreau, Pierre; Liorzou, Bernard.
Anchovy (Engraulis encrasicolus) is an important commercial species and one of the most abundant pelagic fish in the Gulf of Lions and the Catalan Sea. The factors influencing its recruitment are crucial to fisheries and ecological research. Among those factors transport of larvae by hydrodynamics (currents) is important because it determines whether the organisms can reach areas favourable to recruitment or are dispersed. Therefore, the first step in anchovy recruitment modelling is to simulate North-western Mediterranean Sea circulation. Several years (2001-2008) of hydrodynamics were simulated with the MARS-3D code. The resulting simulated currents and salinity are used by Lagrangian tool, Ichthyop, to transport anchovy eggs and larvae to the Western...
Tipo: Text
Palavras-chave: Diel vertical migration; Lagrangian transport; Gulf of Lions; Numerical model; Mediterranean Sea; Anchovy.
Ano: 2009
URL: http://archimer.ifremer.fr/doc/2009/publication-7394.pdf

Morphology of retrogressive failures in the Eastern Rhone Interfluve during the Last Glacial Maximum (Gulf of Lions, Western Mediterranean)
Provedor de dados: 5
Autores: Badhani, Shray; Cattaneo, Antonio; Dennielou, Bernard; Leroux, Estelle; Colin, Florent; Thomas, Yannick; Jouet, Gwenael; Rabineau, Marina; Droz, Laurence.
The Gulf of Lions (NW Mediterranean Sea) is a SW-NE oriented passive continental margin formed since the Oligocene. It presents small to large scale mass movement features suggesting a long history of seafloor instability. Of particular interest are the two surficial large mass-transport deposits along the Rhone turbiditic levee, known as the Rhone Eastern and Western Mass-Transport Deposits (REMTD and RWMTD). With the help of the recently acquired multi-beam bathymetric, sub-bottom profiler, high-resolution seismic and sedimentological data, we investigate the morphology, timing, kinematics, and possible triggering mechanisms of the source area of the REMTD, which we refer to as the Eastern Rhone Interfluve Slide (ERIS). ERIS has an estimated run-out...
Tipo: Text
Palavras-chave: Submarine landslide; Mass transport deposits; Gulf of Lions; Western Mediterranean; Turbiditic levees.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00592/70396/68480.pdf

Glider-Based Active Acoustic Monitoring of Currents and Turbidity in the Coastal Zone
Provedor de dados: 5
Autores: Gentil, Mathieu; Many, Gaël; Durrieu De Madron, Xavier; Cauchy, Pierre; Pairaud, Ivane; Testor, Pierre; Verney, Romaric; Bourrin, François.
The recent integration of Acoustic Doppler Current Profilers (ADCPs) onto underwater gliders changes the way current and sediment dynamics in the coastal zone can be monitored. Their endurance and ability to measure in all weather conditions increases the probability of capturing sporadic meteorological events, such as storms and floods, which are key elements of sediment dynamics. We used a Slocum glider equipped with a CTD (Conductivity, Temperature, Depth), an optical payload, and an RDI 600 kHz phased array ADCP. Two deployments were carried out during two contrasting periods of the year in the Rhone River region of freshwater influence (ROFI). Coastal absolute currents were reconstructed using the shear method and bottom tracking measurements, and...
Tipo: Text
Palavras-chave: Glider; Optics; Acoustics; Satellite; Coastal hydrodynamics; Suspended particulate matter; Particulate fluxes; Gulf of Lions; Mediterranean.
Ano: 2020
URL: https://archimer.ifremer.fr/doc/00648/76039/76962.pdf

Aerial surveys of bluefin tuna in the Western Mediterranean sea: retrospective, prospective, perspective
Provedor de dados: 5
Autores: Bonhommeau, Sylvain; Farrugio, Henri; Poisson, Francois; Fromentin, Jean-marc.
While the current stock status of bluefin tuna (BFT) has been considered as declining, there remain considerable data limitations for its stock assessment in the Mediterranean Sea. The collection of fishery-independent data reveals to be crucial to compensate for the lack of Mediterranean purse seine CPUE indices as well as to overcome a potential halt in the bluefin tuna fishery that would impede the monitoring of the stock and the comparison to reference points. Here we present a retrospective of aerial surveys that have been carried out since 2000. It includes the protocol as well as a retrospective of temporal and spatial distribution of detected schools. We then propose several perspectives that could improve the data collection method itself and the...
Tipo: Text
Palavras-chave: Atlantic bluefin tuna; Aerial survey; Index of abundance; Gulf of Lions; Strip transect.
Ano: 2010
URL: http://archimer.ifremer.fr/doc/00192/30292/28775.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

Modeling larval dispersal for the gilthead seabream in the northwestern Mediterranean sea
Provedor de dados: 5
Autores: Lett, Christophe; Barrier, Nicolas; Ourmières, Yann; Petit, Cécile; Labonne, Maylis; Bourjea, Jerome; Darnaude, Audrey M.
To investigate dispersal and connectivity between spawning and lagoon nursery habitats of the gilthead seabream, Sparus aurata, in the Gulf of Lions (northwestern Mediterranean Sea), we modeled the potential transport of the species’ larvae between its supposed main spawning site in the region (the Planier Island) and two of its main local nursery areas (the coastal lagoons of Thau and Salses-Leucate). Passive larval drift simulations using a dispersal biophysical model showed a large variability in the possible trajectories from spawning to nursery areas and in the predicted ages for larvae arrival on the two nursery sites. The most common ages at arrival obtained in the simulations (20–60 days) are broadly consistent with previous modeling studies but...
Tipo: Text
Palavras-chave: Sparus aurata; Gulf of Lions; Fish; Larvae; Models-hydrodynamic; Biophysical model; Connectivity; Otolith.
Ano: 2019
URL: https://archimer.ifremer.fr/doc/00513/62470/66903.pdf

Shallow gas off the Rhone prodelta, Gulf of Lions
Provedor de dados: 5
Autores: Garcia Garcia, Ana; Orange, D; Lorenson, T; Radakovitch, O; Tesi, T.; Miserocchi, S; Berne, Serge; Friend, P.l.; Nittrouer, C; Normand, Alain.
Sediment cores acquired in 2004 off the Rhone prodelta show consistent anomalous methane concentrations of up to 87,440 ppm. Methane compositional and isotopic data support a biogenic origin, although there are a few sites that show strongly depleted delta C-13 values (-53%o PDB) suggesting a mixed source for the gas (biogenic and thermogenic). Anomalous methane concentrations (samples with more than 90 ppm) are discussed and integrated with organic carbon data, sedimentary rates and ADCP profiles. Highest gas concentrations were found directly off the river mouth (20-40 m water depth) and where the IFREMER models point to the thickest accumulation (&gt; 2 m) in response to the Rhone flood event. In areas unaffected by the high flux of organic matter and...
Tipo: Text
Palavras-chave: Gulf of Lions; Rhone prodelta; Flood deposits; Biogenic methane; Shallow gas.
Ano: 2006
URL: http://archimer.ifremer.fr/doc/2006/publication-2396.pdf

Erosional processes and paleo-environmental changes in the Western Gulf of Lions (SW France) during the Messinian Salinity Crisis
Provedor de dados: 5
Autores: Lofi, Johanna; Gorini, Christian; Berne, Serge; Clauzon, Georges; Dos Reis, A.tadeu; Ryan, William; Steckler, Michael.
Current interpretation of the Messinian Salinity Crisis (MSC) involves partial "clesiccation" of the Mediterranean Sea coupled with the deposition of thick evaporites in the deep basins. New sets of seismic reflection profiles in the western part of the Gulf of Lions confirm the basinward extension of the Messinian erosion and enable the mapping of distinctive seismic markers indicating the Messinian Erosional Surface (or Messinian unconformity), the basin-margin detrital deposits, and the deep evaporite sequence. The geometrical relationship between these three elements and their relationship to the paleogeography of the margin during the MSC provide new information about the evolution of the study area during the Messinian. The Messinian Erosional...
Tipo: Text
Palavras-chave: Fluvial erosion; Eustasy; Tectonism; Detrital deposits; Erosional surface; Messinian Salinity Crisis; Gulf of Lions.
Ano: 2005
URL: http://archimer.ifremer.fr/doc/2005/publication-782.pdf

Modeling of PCB trophic transfer in the Gulf of Lions; 3D coupled model application
Provedor de dados: 5
Autores: Alekseenko, Elena; Thouvenin, Benedicte; Tronczynski, Jacek; Carlotti, F.; Garreau, Pierre; Tixier, Celine; Baklouti, Melika.
3D coupled modeling approach is used for the PCB dispersion assessment in the Gulf of Lion and its transfer to zooplankton via biogeochemical processes. PCB budgets and fluxes between the different species of PCB: dissolved, particulate, biosorbed on plankton, assimilated by zooplankton, which are governed by different processes: adsorption/desorption, bacteria and plankton mortality, zooplankton excretion, grazing, mineralization, volatilization have been estimated. Model outputs were compared with the available in situ data. It was found that the Rhone River outflows play an important role in the organism contamination in the coastal zone, whereas the atmospheric depositions are rather more important in the offshore zones. The transfer of the available...
Tipo: Text
Palavras-chave: PCBs; 3D coupled model; Gulf of Lions; Planktonic food web; CB153 fluxes.
Ano: 2018
URL: https://archimer.ifremer.fr/doc/00440/55177/56654.pdf

Messinian evaporite deposition during sea level rise in the Gulf of Lions (Western Mediterranean)
Provedor de dados: 5
Autores: Bache, Francois; Gargani, Julien; Suc, Jean-pierre; Gorini, Christian; Rabineau, Marina; Popescu, Speranta-maria; Leroux, Estelle; Do Couto, Damien; Jouannic, Gwenael; Rubino, Jean-loup; Olivet, Jean-louis; Clauzon, Georges; Dos Reis, Antonio Tadeu; Aslanian, Daniel.
The Messinian Salinity Crisis resulted from desiccation of the Mediterranean Sea after its isolation from the Atlantic Ocean at the end of the Miocene. Stratal geometry tied to borehole data in the Gulf of Lions show that the pre-crisis continental shelf has been eroded during a major sea-level fall and that sediments from this erosion have been deposited in the basin. This detrital package is onlapped by high amplitude seismic reflectors overlain by the “Messinian Salt” and the “Upper Evaporites”. Towards the shelf, the transition between regressive deposits and overlying onlapping sediments is characterised by a wave-ravinement surface, suggesting that a significant part of the onlapping reflectors and overlying Messinian Evaporites were deposited during...
Tipo: Text
Palavras-chave: Messinian; Mediterranean; Gulf of Lions; Seismic stratigraphy; Evaporites.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00248/35887/34408.pdf