Consulta: subjectFacets:"South Brittany"
Registros recuperados: 6
Data/hora: 04/06/2024 04:08:52

Role of pockmarks in diversity and species assemblages of coastal macrobenthic communities
Provedor de dados: 5
Autores: Dubois, Stanislas; Derian, Francois; Caisey, Xavier; Rigolet, Carinne; Caprais, Jean-claude; Thiebaut, Eric.
We used existing bathymetric data to study the macrofauna of a geophysical pockmark field restricted to a benthic habitat engineered by the tubiculous amphipod Haploops nirae in South Brittany (France). Stations inside and outside pockmarks of different morphometric characteristics (location, size, depression depth) were sampled for macrofauna and environmental parameters (sediment characteristics, organic matter, chl a, hydrogen sulfide and methane concentrations). Diversity indices showed higher species richness inside pockmarks, especially for species with medium to high abundances. Most sediment cores showed low methane but high hydrogen sulfide concentrations. We hypothesised that after eruption, the remaining residual methane from pockmark sediments...
Tipo: Text
Palavras-chave: Benthic habitat; Biodiversity; Succession; Amphipod; Haploops; South Brittany; Sulfide; Methane; Environmental factors.
Ano: 2015
URL: https://archimer.ifremer.fr/doc/00272/38333/36576.pdf

Comparaison des performances d'élevage de moules en 4 sites mytilicoles de la baie de Vilaine, de février 2000 à février 2001
Provedor de dados: 5
Autores: Mazurie, Joseph; Bouget, Jean-francois; Claude, Serge; Fleury, Pierre-gildas; Langlade, Aime.
Mussel samples have been placed in plastic-mesh bags hung on wood poles (« bouchots »), at 4 locations of a mussel culture area in the bay of Vilaine (South Brittany, France). They have been monitored for one year, from February 2000 to February 2001. The recorded growth have been rather fast (plus 1.2 g per month between April and September), and mortalities moderate (between 15% to 25%), with better results in southern stations, further from the estuary.  Among the physico-chemical parameters recorded, the most striking were very low salinities (below 10 g/l) recorded for days, after heavy rains. They provoqued a valve closure of mussels (recorded by a « valvometer »). Some physiological indicators being tested (muscle force and hermeticity) seemed to...
Tipo: Text
Palavras-chave: Valve movements; Hermeticity; Muscle strength; Mortality; Growth; South Brittany; Bay of Vilaine; Mytilus edulis; Mussel; Écartements valvaires; Herméticité; Force musculaire; Mortalité; Croissance; Bretagne sud; Baie de Vilaine; Mytilus edulis; Moule.
Ano: 2001
URL: http://archimer.ifremer.fr/doc/2001/rapport-6373.pdf

Contribution a l'étude de l'étrille Necora puber dans le Mor-Braz : données halieutiques, biologiques et pathologiques
Provedor de dados: 5
Autores: Wilhelm, Gwenaëlle.
The velvet swimming crab Necora puber, commonly found on the French coast was an important resource for inshore fishermen of the Mor-Braz sea in Southern Brittany before the production collapsed in 1985. Although there are still many uncertainties as to the reasons for this, we note that the collapse took place after a significant ecological imbalance which locally caused massive mortality of many marine organisms in 1982.  Without being obviously linked to the former point, mortality due to pathological causes was observed in velvet swimming crabs. Seeing the lack of general knowledge about these crabs, this study was designed to acquire data about its fishery and its biology. The first part focused on fleet, fishing effort and yield trends in the...
Tipo: Text
Palavras-chave: Parasitic dinoflagellate; Hematodinium; Northern Biscay; South Brittany; Pathology; Reproduction; Growth; Fishing; Necora puber; Velvet swimming crab; Dinoflagellé parasite; Hematodinium; Nord Gascogne; Bretagne sud; Pathologie; Reproduction; Croissance; Pêche; Necora puber; Etrille.
Ano: 1995
URL: http://archimer.ifremer.fr/doc/1995/these-1197.pdf

La pêcherie du tourteau Cancer pagurus sur les cotes de Bretagne Sud : déplacements, croissance, reproduction
Provedor de dados: 5
Autores: Le Foll, Anne.
Targeted fishing of the edible crab Cancer pagurus has progressively replaced that of overfished lobster and spiny lobster stocks.  Over the past few years it has become a significant activity for small-scale fishing vessels from various harbours on the Channel and the Atlantic French coast. Official figures show that national landings amounted to 10,000 tonnes in 1980. In spite of this fishery being recent, drops in yield in some areas have brought about changes in the way it is exploited, with more distant fishing grounds and redeployments.  This doctoral thesis study was conducted in relation with the Scientific and Technical Institute of Maritime Fisheries (ISTPM), contributing to the implementation of a rational edible crab management policy....
Tipo: Text
Palavras-chave: Reproduction; Growth; Migration; South Brittany; Northern Biscay; Fishery; Cancer pagurus; Edible crab; Reproduction; Croissance; Migration; Bretagne sud; Nord Gascogne; Pêche; Cancer pagurus; Crabe tourteau.
Ano: 1982
URL: http://archimer.ifremer.fr/doc/1982/these-1204.pdf

Juin 1987 - Distribution de Dinophysis au large de la Bretagne sud (II)
Provedor de dados: 5
Autores: Lassus, Patrick; Truquet, Philippe; Le Dean, Loic; Bardouil, Michele; Truquet, Isabelle.
As a part of hydrological sampLing operation in South Brittany, 8 transects for 26 sampling stations were made in order to determine horizontal, and vertical distribution of Dinophysis sacculus in the 10 m layer. Un like to 1986, results do not show any correlations between Dinophysis concentrations and stability index. That may, nevertheless, be due to lower cells densities in 1987 when compared to 1986. A thermal, gradient, lower than in 1986, is still observable in the Bouthern of Loire Mouth. And, as a last point, when chlorophyll a concentrations are higher in - 10 m layer than in surface layer (Audierne and Noirmoutier areas), it can be observed hight densities of an other toxie Dinoflagellate : Gyrodinium aureolum .
Tipo: Text
Palavras-chave: Bretagne sud; Hydrologie; D. sacculus; G. aureolum; South Brittany; Hydrology; D. sacculus; G. aureolum.
Ano: 1988
URL: http://archimer.ifremer.fr/doc/00138/24921/23015.pdf

Diversité structurelle et fonctionnelle des peuplements sablo-vaseux de Bretagne sud : Impact de l'expansion d'Haploops nirae
Provedor de dados: 5
Autores: Rigolet, Carine.
This thesis aims here, based on the case of the Bay of Concarneau, to understand the impact of the development of dense populations of the tubiculous amphipod Haploops nirae on the structural and functional diversity of sandy-mud communities of South Brittany. The study of Haploops communities was developed on various levels of organization of life, from the specific role of Haploops nirae to functional role of Haploops community in the ecosystem passing through the description of the community composition and its role on the biodiversity. Our results suggest firstly that the functional role of Haploops nirae alone (filtration pressure, secondary production) is potentially important. Moreover, the physical changes induced by Haploops were found to have...
Tipo: Text
Palavras-chave: Ampeliscidae; Réseau trophique; Diversité fonctionnelle; Macrofaune benthique; Diversité; Bretagne Sud; Espèce ingénieure; Ampeliscidae; Benthic macrofauna diversity; Food web; Functional diversity; Engineer species; South Brittany.
Ano: 2013
URL: http://archimer.ifremer.fr/doc/00134/24549/22582.pdf