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Registros recuperados: 16 | |
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Blanchard, Gérard F; Sauriau, Pg; Cariou-le Gall, Valerie; Gouleau, D; Garet, Mj; Olivier, F. |
Resuspension of the top few sediment layers of tidal mud flats is known to enhance planktonic biomass of microbiota (benthic diatoms and bacteria). This process is mainly controlled by tidal shear stress and cohesiveness of mud, and is also influenced by bioturbation activities. Laboratory experiments in a race track flume were performed to test the interactive effects of these factors on both the critical entrainment and resuspension kinetics of microbiota from silt-clay sediments from the Marennes-Oleron Bay, France. The marine snail Hydrobia ulvae was used to mimic surface bioturbation activities. As expected, the kinetics of microbial resuspension versus shear stress were largely controlled by the cohesiveness of silt-clay sediments. However, our... |
Tipo: Text |
Palavras-chave: Microphytobenthos; Bacteria; Resuspension; Bioturbation; Hydrobia ulvae; Shear velocity; Sediment cohesiveness; Flume experiment. |
Ano: 1997 |
URL: http://archimer.ifremer.fr/doc/00337/44789/44480.pdf |
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Guarini, Jean-marc; Blanchard, Fabian; Bacher, Cedric; Gros, Philippe; Riera, P; Richard, P; Gouleau, D; Galois, R; Prou, Jean; Sauriau, Pg. |
Microphytobenthos plays an important role as primary producer in shallow embayments subject to a tidal regime. The present paper aims to characterize the spatial patterns of sedimentary chlorophyll a (chl a) biomass in 2 seasons in the wide intertidal mudflats of the Marennes-Oleron Bay (France); furthermore, it provides estimates of total microphytobenthic biomass. Accordingly, a systematic sampling scheme was performed in June 1995 and in January 1996. On average, biomass was higher in June (ca 120 mg chi a m(-2)) than in January (ca 85 mg chi a m(-2)). Moreover, the geostatistical analysis revealed that spatial similarities were propagated over larger distances in June (6 km) than in January (2.2 km). In order to account or this result, we suggest that... |
Tipo: Text |
Palavras-chave: Microphytobenthos; Chlorophyll a; Spatial distribution; Geostatistics; Intertidal mudflat. |
Ano: 1998 |
URL: http://archimer.ifremer.fr/doc/00447/55852/58117.pdf |
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Sauriau, Pg; Aubert, F; Jourde, J; Pineau, P; Prineau, M. |
L’objet de ce document est d’exposer la bonne réalisation des suivis stationnels des invertébrés benthiques de substrats meubles subtidaux et intertidaux réalisé en avril 2018 conformément au protocole DCE de 2014 dans le cadre de la DCSMM Benthos Loire- Bretagne. Les évaluations de statut écologique issus du paramètre de qualité « invertébrés benthiques de substrats meubles » sont provisoires et devront être corrigées par les évaluations réalisées à l’échelle e la façade atlantique par la coordination Ifremer. |
Tipo: Text |
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Ano: 2019 |
URL: https://archimer.ifremer.fr/doc/00594/70565/68749.pdf |
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Registros recuperados: 16 | |
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