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| 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 |
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| 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 |
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| 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 |
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