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Registros recuperados: 94
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A Bayesian two-stage biomass model for stock assessment of data-limited species: An application to cuttlefish ( Sepia officinalis ) in the English Channel ArchiMer
Alemany, Juliette; Rivot, Etienne; Foucher, Eric; Vigneau, Joel; Robin, Jean-paul.
Cuttlefish is a key commercial species in the English Channel fishery in terms of landings and value. Age-based assessment methods are limited by time-consuming age determination with statoliths and the lack of stock assessment models tailored to this data-limited species. A two-stage biomass model is developed in the Bayesian state-space modelling framework that allows inferences to be made on the stock biomass at the start, middle and end of each fishing seasons between 1992 and 2014, while accounting for both process and measurement errors and to assimilate various sources of information. A method that uses ancillary length-frequency data is developed to provide an informative prior distribution for the biomass growth rate parameter g (E = 0.89) and its...
Tipo: Text Palavras-chave: English Channel; Cuttlefish; Sepia officinalis; Bayesian state-space model; Data-limited stock; Two-stage biomass model.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00376/48766/49289.pdf
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A coupled biophysical model for the distribution of the great scallop Pecten maximus in the English Channel ArchiMer
Le Goff, Clement; Lavaud, Romain; Cugier, Philippe; Jean, Fred; Flye-sainte-marie, Jonathan; Foucher, Eric; Desroy, Nicolas; Fifas, Spyros; Foveau, Aurelie.
In this paper we used a modelling approach integrating both physical and biological constraints to understand the biogeographical distribution of the great scallop Pecten maximus in the English Channel during its whole life cycle. A 3D bio-hydrodynamical model (ECO-MARS3D) providing environmental conditions was coupled to (i) a population dynamics model and (ii) an individual ecophysiological model (Dynamic Energy Budget model). We performed the coupling sequentially, which underlined the respective role of biological and physical factors in defining P. maximus distribution in the English Channel. Results show that larval dispersion by hydrodynamics explains most of the scallop distribution and enlighten the main known hotspots for the population,...
Tipo: Text Palavras-chave: Population dynamic model; Ecophysiological model; English Channel; Pecten maximus; Spatial distribution.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00355/46642/46467.pdf
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A deterministic population dynamics model to study the distribution of a benthic bivalve with planktonic larvae (Paphia rhomboides) in the English Channel (NW Europe) ArchiMer
Savina, Marie; Menesguen, Alain.
This paper describes the development of a modelling framework to study the distribution in the English Channel of a benthic bivalve with planktonic larvae, Paphia rhomboides. Age-structured population dynamics and growth models are linked together to a compartmental transport and NPZ (Nutrients-Phytoplankton-Zooplankton) model. Used in a spin-up mode, i.e. with identical environmental forcing from a year to the next, this deterministic model converges to the same steady state whatever the initial conditions, after 15-30 years of simulation. Important features of the P. rhomboides distribution are reproduced, particularly its high abundance in the GNB (Golfe Normand-Breton) and its almost complete absence in the Western Channel. The results are discussed in...
Tipo: Text Palavras-chave: Spatial distribution; Meroplanktonic invertebrates; Growth model; Population dynamics model; Paphia rhomboides; English Channel.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3718.pdf
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A two-stage biomass model to assess the English Channel cuttlefish (Sepia officinalis L.) stock ArchiMer
Gras, Michael; Roel, Beatriz A.; Coppin, Franck; Foucher, Eric; Robin, Jean-paul.
The English Channel cuttlefish (Sepia officinalis) is the most abundant cephalopod resource in the Northeast Atlantic and one of the three most valuable resources for English Channel fishers. Depletion methods and age-structured models have been used to assess the stock, though they have shown limitations related to the model assumptions and data demand. A two-stage biomass model is, therefore, proposed here using, as input data, four abundance indices derived from survey and commercial trawl data collected by Ifremer and Cefas. The model suggests great interannual variability in abundance during the 17 years of the period considered and a decreasing trend in recent years. Model results suggest that recruitment strength is independent of spawning-stock...
Tipo: Text Palavras-chave: Abundance indices; English Channel; Exploitation rate; Sepia officinalis; SST; Stock–recruitment relationship; Trawl survey; Two-stage biomass model.
Ano: 2014 URL: http://archimer.ifremer.fr/doc/00248/35923/34448.pdf
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Absorption et régénération de l'azote dans le système brassé de la Manche : productions nouvelle et régénérée ArchiMer
Maguer, Jf; L'Helguen, S; Madec, C; Le Corre, P.
Nitrate and ammonium uptake rates were measured in spring and summer in deep and shallow well-mixed waters of the English Channel during different cruises between 1986 and 1994. In the deep waters, nitrate uptake was relatively low during phytoplankton development and ammonium uptake represented more than 70 % of the total uptake irrespective of the season. In the shallow waters, nitrate uptake during spring phytoplankton growth was high and represented about 75 % of the total uptake. Ammonium uptake became substantial towards the end of spring and summer. The high contribution of ammonium to the nitrogenous nutrition of phytoplankton over the whole of the well-mixed waters is related to a high rate of recycling of nitrogen in the water column. Ammonium...
Tipo: Text Palavras-chave: Azote; Absorption; Régénération; Productions nouvelle et régénérée; Manche; Nitrogen; Uptake; Regeneration; New and regenerated productions; English Channel.
Ano: 1998 URL: http://archimer.ifremer.fr/doc/00325/43644/43246.pdf
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Approche systémique des potentialités de production secondaire pélagique: inférences de fluctuations interannuelles ArchiMer
Bergeron, Jean-pierre.
Une méthode d'estimation des potentialités de production secondaire pélagique est proposée, tirant profit de l'homologie interspécifique de certains processus métaboliques élémentaires. Elle consiste à mesurer l'activité de l'aspartate transcarbamylase (A TC), enzyme contribuant à la biosynthèse de composants de base des acides nucléiques, sur des échantillons du peuplement mésozooplanctonique total. L'exécution de onze campagnes au cours des périodes printanières de trois. années consécutives, de 1978 à 1980, a permis d'appliquer cette approche à un écosystème néritique de région tempérée, situé au large de la côte nord de la Bretagne (Manche occidentale). Les onze séries de données ainsi acquises prêtent à caractériser les traits essentiels de...
Tipo: Text Palavras-chave: Aspartate transcarbamylase; Écosystème pélagique; Manche; Production; Zooplancton; Aspartate transcarbamylase; Pelagic ecosystem; English Channel; Production; Zooplankton.
Ano: 1986 URL: http://archimer.ifremer.fr/doc/00072/18315/15884.pdf
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Biogeochemical markers of organic matter along the Wight-Cherbourg transect (central English Channel) ArchiMer
Ismaili, Mm; Serve, L; Gadel, F; Lafite, R; Texier, H.
Three cruises on the Wight-Cherbourg transect were undertaken during the FluxManche II Programme in order to study the origin, nature and behaviour of organic matter inputs to the waters of the English Channel. Suspended particulate material (SPM) collected from surface and deep waters at each station was analysed at elemental level for Particulate Organic Carbon and Particulate Organic Nitrogen (POC, PON), at molecular level for main classes of organic compounds using Pyrolysis-Gas Chromatography coupled with Mass Spectrometry (Py-GC-MS) and for phenolic compounds, particularly lignin-derived phenols, using High Performance Liquid Chromatography (HPLC). The SPM content increases from the French (south) to the English coast (north) with the lowest values...
Tipo: Text Palavras-chave: Matière particulaire en suspension; Composés organiques; Marqueurs phénoliques; Biogéochimie; Manche; Suspended particulate matter; Organic compounds; Phenolic markers; Biogeochemistry; English Channel.
Ano: 1999 URL: http://archimer.ifremer.fr/doc/00325/43603/43922.pdf
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Biologie et exploitation de l'araignée de mer Maja squinado Herbst en Manche Ouest ArchiMer
Le Foll, Didier.
The aim of this work, which was done as a Doctorate of Philosophy (Phd), was to collect the information necessary to help improve the management of the western Channel spider crab stock. The fîrst section présents the main aspects of spider crab population biology. As well as contributing our own results on spider crab habitat, stock density, démographie structure, growth and mortality estimâtes, migrations, reproduction and recruitment, a synthesis is included of the existing scientific literature. The second section on exploitation covers various features of the fishery : its history, fishing methods, fleet structure, spatial and seasonal distribution of fishing efforts in 1986, trends in the landings, fishing effort and catch per unit effort,...
Tipo: Text Palavras-chave: Exploitation; Biologie; Manche; Maja squinado; Araignée; Exploitation; Biology; English Channel; Maja squinado; Spider crab.
Ano: 1993 URL: https://archimer.ifremer.fr/doc/1993/rapport-638.pdf
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Captures accidentelles françaises de mammifères marins sur les filets calés en Manche-mer du Nord et en zones Ciem VII. Observations réalisées durant les deux années du projet FilManCet ainsi que dans le cadre d’Obsmer ArchiMer
Morizur, Yvon; Gaudou, Olivier; Miossec, Dominique; Toulhoat, Lucile; Gamblin, Caroline.
Up to now there has been no strong investigation on by-catch of marine mammals in the French set net fisheries of the English Channel (ICES areas VIIe,d & IVc) as the EC 812/2004 Regulation does not oblige the state members to put observers on board of vessels in the ICES area VII. A study named FilManCet has been started end 2008-beginning 2009 to focus on the by-catch occurring on the set net vessels (whatever the hull length is) issued from Boulogne and Dunkerque ports (fisheries in VIId&IVc) and also from several ports of North of Brittany. In this study which is conducted by the Fishing Industry, the data are made available to the scientists of Ifremer who has prepared also the sampling scheme for observation at sea. Two observers are employed...
Tipo: Text Palavras-chave: Bycatch; Set nets; English Channel; Marine mammals; Harbour porpoise; Phocoena phocoena; Grey seal; Halichoerus grypus.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00035/14666/11967.pdf
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Catalogue international des activités des flottilles de Manche, approche des interactions techniques ArchiMer
Tetard, A; Boon, M; Bennett, D; Berthou, Patrick; Bossy, P; Casey, J.
This work is the result of collaboration between the English, French, Channel Isles and Belgian laboratories which are involved in a study of the English Channel. Its subject is the activities of fleets and their interactions, and it complements other work on the biogeographical identification of Channel fish and shellfish stocks (published), and on modelling the fleets' interactions as they exploit theresources (in preparation). The concept of a metier is defined as being the use of one fishing gear to catch one or several species targeted during a particular season in a given area. On this basis, 74 metiers were identified during 1989-90. For each metier we give a brief description of the catching gear, the target species and most usual by-catch, the...
Tipo: Text Palavras-chave: Fisheries management; Fishing effort; Technical interactions; English Channel; Metier; Gestion des pêcheries; Distribution de l'effort de pêche; Interactions techniques; Manche; Métiers.
Ano: 1995 URL: http://archimer.ifremer.fr/doc/1995/rapport-3836.pdf
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Catalogue international des activités des flottilles de Manche, approche des interactions techniques ArchiMer
Tetard, A; Boon, M; Bennett, D; Berthou, Patrick; Bossy, S; Casey, J; De Clerck, R; Delpech, Jean-paul; Dintheer, C; Giret, M; Large, P; Latrouite, Daniel; Lemoine, Michel; Millner, R; Morizur, Yvon; Ozanne, S; Palmer, D; Pawson, M; Pickett, G; Vince, M.
This work is the result of collaboration between the English, French, Channel Isles and Belgian laboratories which are involved in a study of the English Channel. Its subject is the activities of fleets and fleet interactions, and it complements other work on the biogeographical identification of Channel fish and shellfish stocks (published), and on modelling the fleets' interactions as they exploit the resources (in preparation). The concept of a métier is defined as being the use of one fishing gear to catch one or several species targeted during a particular season in a given area. On this basis, 74 métiers were identified during 1989-90. For each métier we give a brief description of the catching gear, the target species and most usual by-catch, the...
Tipo: Text Palavras-chave: Fisheries management; Fishing effort; Technical interactions; English Channel; Métier; Gestion des pêcheries; Distribution de l'effort de pêche; Interactions techniques; Manche; Métiers.
Ano: 1993 URL: http://archimer.ifremer.fr/doc/1993/rapport-704.pdf
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Cenozoic tectonics of the Western Approaches Channel basins and its control of local drainage systems ArchiMer
Le Roy, Pascal; Gracia-garay, Claire; Guennoc, Pol; Bourillet, Jean-francois; Reynaud, Jean-yves; Thinon, Isabelle; Kervevan, Patrick; Paquet, Fabien; Menier, David; Bulois, Cedric.
The geology of the Channel Western Approaches is a key to understand the post-rift evolution of the NW European continental margin in relation with the Europe/Africa collision. Despite considerable evidence of Tertiary tectonic inversion throughout the Channel basin, the structures and amplitudes of the tectonic movements remain poorly documented across the French sector of the Western Approaches. The effect of the tectonic inversion for the evolution of the "Channel River", the major system that flowed into the English Channel during the Plio-Quaternary eustatic lowstands, also needs to be clarified. Its drainage basin was larger than the present-day English Channel and constituted the source of terrigenous fluxes of the Armorican and Celtic deep sea...
Tipo: Text Palavras-chave: English Channel; Western Approaches basins; Cenozoic; Palaeovalley; Seismic stratigraphy; Tectonic inversion.
Ano: 2011 URL: http://archimer.ifremer.fr/doc/00056/16706/15776.pdf
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Construction of Multi-Year Time-Series Profiles of Suspended Particulate Inorganic Matter Concentrations Using Machine Learning Approach ArchiMer
Renosh, Pannimpullath R.; Jourdin, Frederic; Charantonis, Anastase A.; Yala, Khalil; Rivier, Aurelie; Badran, Fouad; Thiria, Sylvie; Guillou, Nicolas; Leckler, Fabien; Gohin, Francis; Garlan, Thierry.
Hydro-sedimentary numerical models have been widely employed to derive suspended particulate matter (SPM) concentrations in coastal and estuarine waters. These hydro-sedimentary models are computationally and technically expensive in nature. Here we have used a computationally less-expensive, well-established methodology of self-organizing maps (SOMs) along with a hidden Markov model (HMM) to derive profiles of suspended particulate inorganic matter (SPIM). The concept of the proposed work is to benefit from all available data sets through the use of fusion methods and machine learning approaches that are able to process a growing amount of available data. This approach is applied to two different data sets entitled “Hidden” and “Observable”. The hidden...
Tipo: Text Palavras-chave: Suspended particulate inorganic matter; Self-organizing maps; Hidden Markov Model; Machine learning; English Channel; ROMS.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00415/52653/53511.pdf
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Contribution des frayères côtières au recrutement du stock de seiche Sepia officinalis de Manche : lien entre le succès de la phase pré-recrutée et l'abondance de la ressource ArchiMer
Gras, Michael.
The English Channel cuttlefish Sepia officinalis is the most important cephalopod stock in the N-E Atlantic but is only managed by local measures, mainly due to a lack of suitable tools. The objective of this work is therefore to improve the knowledge of its population dynamic, particularly the parameters inuencing the resource abundance. After a summary of the state of the art, in a first step, the exploration of the stock structure during the reproduction period revealed that, in a warming and high fishing pressure context, the life history traits of cuttlefish have changed and a percentage of one year old cuttlefish are mature. In a second step, the inuence of the fuel price on the spatial allocation of the French trawling effort was highlighted and...
Tipo: Text Palavras-chave: Sepia officinalis; Manche; Cycle de vie; Pêcheries; Modèle d'évaluation de stock; Recrutement.; Sepia officinalis; English Channel; Life cycle; Fisheries; Stock assessment model; Recruitment..
Ano: 2013 URL: http://archimer.ifremer.fr/doc/00160/27135/25334.pdf
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Contrôle de surveillance benthique de la Directive Cadre sur l'Eau (2000/60/CE) : Année 2007 - District Artois-Picardie ArchiMer
Desroy, Nicolas; Guerin, Laurent; Le Mao, Patrick.
This report deals with results of monitoring carried out in 2007 (monitoring control for benthic invertebrates) for the area concerned by the Artois-Picardie water district.
Tipo: Text Palavras-chave: Directive Cadre Eau; Benthos; Réseau de surveillance; Manche; European Water Framework Directive; Benthos; Monitoring Network; English Channel.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00241/35273/33791.pdf
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Contrôle de surveillance benthique de la Directive Cadre sur l'Eau (2000/60/CE) : Année 2007 - District Seine-Normandie ArchiMer
Desroy, Nicolas; Guerin, Laurent; Le Mao, Patrick.
This report deals with results of monitoring carried out in 2007 (monitoring control for benthic invertebrates and for Zostera marina seagrasses) for the area concernent by the Seine-Normandie water district.
Tipo: Text Palavras-chave: Directive Cadre Eau; Benthos; Réseau de surveillance; Manche; European Water Framework Directive; Benthos; Monitoring Network; English Channel.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/00242/35282/33800.pdf
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Contrôle de surveillance benthique de la Directive Cadre sur l'Eau (2000/60/CE) : Année 2008 - District Artois-Picardie ArchiMer
Nebout, Thibaut; Desroy, Nicolas; Le Mao, Patrick.
This report deals with results of monitoring carried out in 2008 (monitoring control for benthic compartment : benthic invertebrates and macroalgae) for the area concerned by the Artois-Picardie water district.
Tipo: Text Palavras-chave: Directive Cadre Eau; Benthos; Réseau de surveillance; Manche; European Water Framework Directive; Benthos; Monitoring Network; English Channel.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00241/35274/33792.pdf
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Contrôle de surveillance benthique de la Directive Cadre sur l'Eau (2000/60/CE) : Année 2008 - District Seine-Normandie ArchiMer
Nebout, Thibaut; Desroy, Nicolas; Le Mao, Patrick.
This report deals with results of monitoring carried out in 2008 (monitoring control for benthic invertebrates, macroalgae, opportunistic algae and for Zostera marina and Zostera noltii seagrasses) for the area concerned by the Seine-Normandie water district.
Tipo: Text Palavras-chave: Directive Cadre Eau; Benthos; Réseau de surveillance; Manche; European Water Framework Directive; Benthos; Monitoring Network; English Channel.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/00242/35284/33801.pdf
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Contrôle de surveillance benthique de la Directive Cadre sur l'Eau (2000/60/CE) : Année 2009 - District Artois-Picardie ArchiMer
Nebout, Thibaut; Desroy, Nicolas; Le Mao, Patrick.
This report deals with results of monitoring carried out in 2009 (monitoring control for benthic compartment : benthic invertebrates and macroalgae) for the area concerned by the Artois-Picardie water district.
Tipo: Text Palavras-chave: Directive Cadre Eau; Benthos; Réseau de surveillance; Manche; European Water Framework Directive; Benthos; Monitoring Network; English Channel.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00242/35275/33794.pdf
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Contrôle de surveillance benthique de la Directive Cadre sur l'Eau (2000/60/CE) : Année 2009 - District Seine-Normandie ArchiMer
Nebout, Thibaut; Desroy, Nicolas; Le Mao, Patrick.
This report deals with results of monitoring carried out in 2009 (monitoring control for benthic invertebrates, maerl beds and opportunistic algae) for the area concerned by the Seine-Normandie water district.
Tipo: Text Palavras-chave: Directive Cadre Eau; Benthos; Réseau de surveillance; Manche; European Water Framework Directive; Benthos; Monitoring Network; English Channel.
Ano: 2010 URL: http://archimer.ifremer.fr/doc/00242/35286/33804.pdf
Registros recuperados: 94
Primeira ... 12345 ... Última
 

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