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Registros recuperados: 5
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Benthic metabolism over the emersion - Immersion alternation in sands colonized by the invasive Manila clam Ruditapes philippinarum ArchiMer
Migne, Aline; Trigui, Rima Jihane; Davoult, Dominique; Desroy, Nicolas.
The effect of an invasive infaunal suspension-feeding bivalve, the Manila clam Ruditapes philippinarum, on benthic inorganic carbon and nutrient fluxes was examined through in situ incubations. Measurements were performed in spring and summer on a tidal sandflat of the Rance estuary (south part of the Western English Channel) colonized by the Manila clam after its deliberate introduction in the 1990's. Benthic inorganic carbon fluxes were measured using light and dark benthic chambers both at emersion and immersion. Benthic nutrient fluxes were measured using dark benthic chambers at immersion. Inorganic carbon (IC) and ammonium sediment release under darkness at immersion reached 5.60 mmol m−2 h−1 and 441 μmol m−2 h−1 respectively for a clam density of...
Tipo: Text Palavras-chave: Benthic fluxes; Benthos; Inorganic carbon; Nutrients; Suspension-feeding bivalve; Tidal flats; France; Western English Channel.
Ano: 2018 URL: https://archimer.ifremer.fr/doc/00412/52327/53100.pdf
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Les rejets dans la pêche artisanale de Manche occidentale ArchiMer
Morizur, Yvon; Pouvreau, Stephane; Guenole, Annie.
Observers were set on board of fishing vessels from North Brittanny ports during one full year (1992-93). This study granted by EC Commission (contract CE/DGXIV-C-1 n° 1992/06) was a first approach for assessing French discards in the western English Channel. It identifies the main species discarded and produces a rough estimate of discard rates and size compositions in each métier targeting fish. The major reasons for variability were explained. Size compositions of catches and discards were provided in order to permit better estimates of the mortality induced by fishing operations. The fixed nets observed were large mesh nets (270 to 360 mm) targeting monkfish and small mesh nets (<200 mm) targeting coastal resources. Netting was found to be more...
Tipo: Text Palavras-chave: France; Western English Channel; Bottom trawls; Fixed nets; Fisheries; Discards.
Ano: 1996 URL: https://archimer.ifremer.fr/doc/1996/rapport-1730.pdf
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Modelling the Karenia mikimotoi bloom that occurred in the western English Channel during summer 2003 ArchiMer
Vanhoutte Brunier, Alice; Fernand, L; Menesguen, Alain; Lyons, S; Gohin, Francis; Cugier, Philippe.
Observations from space and in situ from the R.V Corystes 8/03 Cruise show that a massive Karenia mikimotoi bloom occured during summer 2003 in the western English Channel. Due to exceptional climatoligical conditions that occured in June 2003, the installation of a very strong thermocline enhanced the development of a massive bloom over 1 million cells 1(-1) in the Central English Channel. This paper presents the application of a mathematical model of this species, previously developed in for the Bay of Biscay, into a general 3D model of the primary production of the English Channel and southern Bight of the North Sea. Allelopathic interactions exerted by K. mikimotoi on other phytoplankton species and the role of agitation in the mortality of this...
Tipo: Text Palavras-chave: Western English Channel; SeaWiFS; Primary production; Karenia mikimotoi; 3D modelling; Coupled physical biogeochemical.
Ano: 2008 URL: http://archimer.ifremer.fr/doc/2008/publication-3717.pdf
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Observed and projected Sea Surface Temperature seasonal changes in the Western English Channel from satellite data and CMIP5 multi-model ensemble. ArchiMer
L'Heveder, Blandine; Speich, Sabrina; Ragueneau, Olivier; Gohin, Francis; Bryere, Philippe.
Seasonal Sea Surface Temperature (SST) changes in the Western English Channel have been estimated for the previous decades from high-resolution satellite data. Coastal seas, well separated from offshore waters by intense frontal structures, show colder SST by 1 to 2°C in summer. A significant warming trend is observed in the autumn season. This positive trend is stronger offshore, with an annual mean SST increase of 0.32°C/decade, but weaker in coastal waters (0.23°C/decade), where strong vertical mixing induced by tides and winds acts to reduce surface warming. The performance of an ensemble of CMIP5 climate model in simulating recent seasonal changes of SST in the region is estimated. The median of CMIP5 models reproduces very well the observed SST mean...
Tipo: Text Palavras-chave: SST; Climate change; Western English Channel; CMIP5; Regional study.
Ano: 2017 URL: http://archimer.ifremer.fr/doc/00350/46163/45861.pdf
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Variations saisonnières de l'absorption de l'azote dans un système brassé peu profond (Manche occidentale) ArchiMer
Maguer, Jf; Lecorre, P; Madec, C.
Seasonal changes in inorganic (NH4+; NO3-; NO2-) and organic (urea) nitrogen uptake were studied with N-15 as a tracer at a shallow station (depth: 22 m) in permanently well-mixed waters of the Western English Channel. Uptake of all the four nutrients was maximum in spring. Nitrate uptake accounted for a third of the total during spring phytoplankton growth, but decrease in summer. This decrease was related to the low ambient nitrate concentrations in early summer and to an inhibition of uptake by high concentrations in late summer. Ammonium was taken up in significant amounts from the beginning of spring (46 % of total uptake), increasing to 59 % in summer. In contrast with nitrate, ammonium concentrations during summer were sufficiently high to saturate...
Tipo: Text Palavras-chave: Nitrogen; Uptake; Seasonal variations; Western English Channel.
Ano: 1996 URL: http://archimer.ifremer.fr/doc/00096/20723/18360.pdf
Registros recuperados: 5
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