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Registros recuperados: 11
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Are deep-sea ecosystems surrounding Madagascar threatened by land-use or climate change? ArchiMer
Fontanier, Christophe; Mamo, Briony; Toucanne, Samuel; Bayon, Germain; Schmidt, Sabine; Deflandre, Bruno; Dennielou, Bernard; Jouet, Gwenael; Garnier, Eline; Sakai, Saburo; Lamas, Ruth Martinez; Duros, Pauline; Toyofuku, Takashi; Sale, Aurelien; Belleney, Deborah; Bichon, Sabrina; Boissier, Audrey; Cheron, Sandrine; Pitel, Mathilde; Roubi, Angelique; Rovere, Mickael; Gremare, Antoine; Dupre, Stephanie; Jorry, Stephan.
In this short communication, we present a multidisciplinaty study of sedimentary records collected from a deep-sea interfluve proximal to the mouths of major northwestern Madagascan rivers. For the last 60 years, the seafloor has been repeatedly disturbed by the deposition of organic rich, tropical, terrestrial sediments causing marked reductions in benthic biodiversity. Increased soil erosion due to local land-use, deforestation and intensifying tropical cyclones are potential causes for this sedimentary budget and biodiversity shift. Our marine sedimentary records indicate that until now, these conditions have not occurred within the region for at least 20,000 years.
Tipo: Text Palavras-chave: Multidisciplinary study; Benthic foraminifera; Land-use; Tropical cyclones.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00413/52488/53276.pdf
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Caractéristiques de dragues et pêcheries ArchiMer
Pitel, Mathilde; Berthou, Patrick; Fifas, Spyros.
Basically, a dredge is a bottom-towed gear and consists of a metal frame with a blade or teeth, to dig into the sediment and extract the shelled molluscs, and a mesh bag to collect the catch. Whereas hand dredging is observed on some intertidal beds (Donax trunculus in France), the use of dredge generally needs a fishing boat. There is a great diversity of dredge types, with specific designs used to target different species in particular beds: Manual dredges for Donax (Donax trunculus), Warty venus (Venus verrucosa) and clams (Venerupis pulastra, Ruditapes sp) Dredges for King scallops (Pecten maximus) Dredges for Warty venus (Venus verrucosa) Dredge for Queen scallops (black and white, Chlamys varia and Chlamys opercularia) Dredges for small...
Tipo: Text Palavras-chave: Management; Environmental impact; Spisula; Bittersweet palourdi; Fishing boat; Clam; Dredge; Brittany; Gestion; Impact environnemental; Spisula; Amande; Navire de pêche; Drague; Bretagne.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-4608.pdf
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Evaluation and improvement of shellfish dredge design and fishing effort in relation to technical conservation measures and environmental impact: [ECODREDGE CT98-4465] ArchiMer
Lart, William; Jacklin, Marcus; Horton, Roger; Ward, Nigel; Arkely, Ken; Misson, Trevor; Allan, Peter; Savage, Thomas; Lart, Geoff; Berthou, Patrick; Priour, Daniel; Fifas, Spyros; Danioux, Christian; Pitel, Mathilde; Brand, Andy; Jenkins, Stuart; Allen, Hugh; Campbell, Ross; Da Ros, Luisa; Nesto, Nicoletta; Bianchi, Franco; Acri, Francesco; Boldrin, Alfredo; Nasci, Cristina; Penzo, Mauro; Antonini, Antonini; Cesca, Arduino; Marin, Marco; Pellizzato, Michele; Marin, Maria; Moschino, Vanessa; Pampanin, Daniela; Ballarin, Loriano; Casellato, Sandra; Masiero, Luciano; Del Favero, Marcello; Allan, Peter; Chicharo, Luís; Chicharo, Alexandra; Alves, Filipe; Tata Regala, João; Gaspar, Miguel B.; Santos, Miguel N.; Leitao, Francisco; Sobral, Manuel; Dias, Maria D.; Campos, Aida; Monteiro, Carlos C.; Falcao, Manuela M.; Vale, Carlos; Caetano, Miguel; Burnell, Gavin; Maguire, Julie; Byrne, Pam.
This project systematically examines the bivalve dredging process and its physiological and ecological consequences. The literature on ecology and population dynamics of the target species, dredge design and fisheries and the environmental effects of dredging and selectivity of dredging is reviewed. A programme of experimental work, both laboratory and field studies is described in scallop and clam dredge fisheries in European waters; scallop species (UK, France) Pecten maximus, Aequipecten opercularis, clam species (Italy; N. Adriatic) Chamelea gallina, clam species (Portugal) Spisula solida, Donax trunculus, Callista chione. Selectivity measures and dredge design are examined for their consequences in terms of environmental effects. Studies included...
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Ano: 2003 URL: http://archimer.ifremer.fr/doc/00307/41851/41086.pdf
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Evaluation directe du stock de praires Venus verrucosa en rade de Brest ArchiMer
Pitel, Mathilde; Fifas, Spyros; Berthou, Patrick.
In the 1960s, with a drop in the king scallop stock, the clam became a substitution resource with productions of over 400 tonnes. The drop in the production until the disruption of the fishery in the 1980s is the combined consequence of the increase of the fishing capacities with an unfavourable populating demographic strategy. Large deposits are fairly rare. In 7 years, only one age group, born in 1971, withstood the fishery. Many age groups of satisfactory abundance, from the end of the 80s on, combined with a total disruption of the fishery for a few years, lead to a recovery of the stock with fishing levels equivalent (today) to those of the 1950s. The clam, though less iconic than the king scallop in the local context, has now been for a number of...
Tipo: Text Palavras-chave: Campaign; Jeancani; Survey; Venus verrucosa; Clams; Bay of Brest; Brittany; Jeancani; Campagne à la mer; Venus verrucosa; Praires; Rade de Brest; Bretagne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-4603.pdf
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Evaluation du stock de palourdes roses Paphia rhomboïdes en baie de St Brieuc ArchiMer
Huet, Jerome; Pitel, Mathilde.
A drop in the performance of banded carpet shell Paphia rhomboïdes fishing in the Saint Brieuc Bay has been witnessed by the Saint-Brieuc Bay banded carpet shell professional fishermen since 2002. The Ifremer has been asked to assess the state of the banded carpet shell deposit in this fishing area. This mission report presents the results of the banded carpet shell stock evaluation campaign carried out in collaboration with professional fishermen in May 2006 on board the "Narval Bretagne". The results of the direct local small bivalve evaluations of the "Bivalve 2002" campaign conducted in May 2002 on board the research vessel Thalia in the same area are provided as a benchmark.
Tipo: Text
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-6430.pdf
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Evaluation du stock de praires en rade de Brest ArchiMer
Pitel, Mathilde; Martin, Stephane; Fifas, Spyros; Huet, Jerome; Berthou, Patrick.
Pendant les années 50, la praire a joué un rôle secondaire dans le contexte maritime local. Au cours des années 50, cette espèce était ciblée par une flottille différente de la coquille Saint-Jacques de la rade de Brest, à capacité de capture modeste (flottille du Relecq Kerhuon) permettant la réalisation des captures annuelles moyennes de l'ordre de 150 tonnes. La décennie 60, après l'effondrement du stock coquillier a vu la praire occuper une place de ressource de substitution pour atteindre des productions dépassant les 400 tonnes. Les premières étapes de l'évolution de cette pêcherie sont détaillées par Le Gall (1969) et Piboubès (1973). Petit à petit, la flottille s'est transformée (à partir des années 70, entrée progressive des goémoniers dans la...
Tipo: Text Palavras-chave: Jeancani; Venus verrucosa; Clams; Bay of Brest; Brittany; Jeancani; Venus verrucosa; Ressource de substitution; Praires; Rade de Brest; Bretagne.
Ano: 2006 URL: http://archimer.ifremer.fr/doc/2006/rapport-4602.pdf
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Evaluation du stock de praires en rade de Brest - 2001 ArchiMer
Pitel, Mathilde; Fifas, Spyros; Huet, Jerome; Berthou, Patrick.
During the 1950s, the clam played only a bit part in the local maritime context. It was the focus of a different fleet than the king scallop fleet, with a lesser fishing capacity (fleet from the Relecq Kerhuon) and an average annual catch of around 150 tonnes. In the 1960s, with a drop in the king scallop stock, the clam became a substitution resource with productions of over 400 tonnes. The first stages of this evolution are detailed by Le Gall (1969) and Piboubès (1973). Slowly, the fleet developed (from the 70s on, with the progressive arrival of seaweed boats in the fishery) The drop of the production until the disruption of the fishery in the 1980s is the combined consequence of the increase of the fishing capacities with an unfavourable populating...
Tipo: Text Palavras-chave: Venus verrucosa; Stock assessment; Clams; Bay of Brest; Brittany; Venus verrucosa; Évaluation de stock; Praires; Rade de Brest; Bretagne.
Ano: 2001 URL: http://archimer.ifremer.fr/doc/2001/rapport-4607.pdf
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Evaluations locales des populations de bivalves dans le golfe de normand breton. Résultats de la campagne BIVALVES2002 ArchiMer
Pitel, Mathilde; Savina, Marie; Fifas, Spyros; Berthou, Patrick.
The exploited stocks of wild bivalves (common cockles, dog cockles, clams, and spisules) in the Norman-Breton gulf vary according to the fishing activity and the environmental conditions. Different studies, carried out by the Ifremer in this region (between 1982 and 1998), enabled the evaluation of the stocks available for fishing as well as the collection of data on these species (demographic structure, growth...). For more information on the 1993-1994 studies and a presentation of the site and the fishery please refer to the reports by Berthou, 1987 and Noël et al, 1995. The bivalve expedition conducted in May 2002, enabled us to update the data on the populations of dog cockles and banded carpet shells, then of spisules and clams, using the same...
Tipo: Text Palavras-chave: Bittersweet palourdi; Spisula; Clam; Brittany norman gulf; Bibalves; Brittany; Fishing; Crepidule; Amande de mer; Spisule; Praire; Palourde; Golfe normand breton; Bivalves; Bretagne; Pêche.
Ano: 2004 URL: http://archimer.ifremer.fr/doc/2004/rapport-4609.pdf
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Pockmarks on the South Aquitaine Margin continental slope: The seabed expression of past fluid circulation and former bottom currents ArchiMer
Michel, Guillaume; Dupre, Stephanie; Baltzer, Agnes; Ehrhold, Axel; Imbert, Patrice; Pitel, Mathilde; Loubrieu, Benoit; Scalabrin, Carla; Lazure, Pascal; Marie, Louis; Geldof, Jean-baptiste; Deville, Eric.
Inactive and mostly elongated pockmarks of 100–200 m in dimension were recently discovered on the South Aquitaine Margin continental slope. They are distributed at water depths greater than 350 m in both interfluve and sediment-wave areas, and are strongly controlled by the sedimentary morphology and architecture. Water column and seafloor backscatter and sub-bottom profiler data do not exhibit present-day or past gas evidence, e.g., massive and continuous gas releases at the seabed and fossil methane-derived authigenic carbonates. It is thus proposed that the pockmarks originated from a shallow source and result from relatively recent and short-duration gas or water expulsion events. Former near-bottom currents may have contributed to the elongation of...
Tipo: Text Palavras-chave: Pockmark; Fluid; Seabed morphology; Aquitaine slope; GIS; Currents.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00413/52491/53279.pdf
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Situation de la pêche en Guadeloupe en 2008. Rapport du projet pilote Système d'Informations Halieutiques Guadeloupe 2007/2009 ArchiMer
Guyader, Olivier; Berthou, Patrick; Reynal, Lionel; Demaneche, Sebastien; Bruneau, Marie; Bellanger, Manuel; Angin, Baptiste; Merrien, Claude; Guegan, Fabrice; Lespagnol, Patrick; Pitel, Mathilde; Jezequel, Michele; Leblond, Emilie; Daures, Fabienne.
Ce document présente les principaux résultats obtenus pour l’année de référence 2008, il ne détaille pas les différentes méthodologies mises en oeuvre pour la collecte, la validation, la qualification des données et leur traitement qui sont présentés dans des documents scientifiques et techniques séparés. Après avoir caractérisé les méthodologies statistiques et intégrées du système d'informations halieutiques, le rapport présente la structure de la flotte de pêche guadeloupéenne et son évolution depuis la fin des années 90. Il détaille l'activité des flottilles ainsi que les métiers pratiqués et leur distribution par communes et par zones de pêche. Une estimation de l'effort de pêche et des productions débarquées par espèces commerciales et par métiers...
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Ano: 2011 URL: http://archimer.ifremer.fr/doc/00086/19689/17321.pdf
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Synthèse des flottilles de pêche 2007 - Flotte Mer du Nord - Manche-Atlantique ArchiMer
Leblond, Emilie; Daures, Fabienne; Berthou, Patrick; Merrien, Claude; Pitel, Mathilde; Jezequel, Michele.
Le présent document, sixième édition d'une série lancée en 2000, réactualise la Synthèse des flottilles 2006, publiée en 2008. Il ne prétend pas rendre compte de l'ensemble des données collectées depuis cette précédente édition. Cependant, il a pour ambition de présenter de manière synthétique, l'activité et la situation économique de la flotte de pêche française métropolitaine (façades mer du Nord Manche, Atlantique et Méditerranée), à destination d'un public très large. La Synthèse des flottilles de pêche 2007 est une compilation de fiches synthétiques, chacune d'entre elles étant construite sur le même format. : - La fiche de synthèse France Métropolitaine Elle décrit la flotte des façades Mer du Nord Manche, Atlantique et Méditerranée. Elle propose en...
Tipo: Text Palavras-chave: Marins; Navires; Situation économique; Peche; Activité; Flottilles; Méditerranée; Atlantique; Mer du Nord; Manche.
Ano: 2009 URL: http://archimer.ifremer.fr/doc/2009/rapport-6929.pdf
Registros recuperados: 11
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