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Publication . Article . Other literature type . 1997

Kinetics of tidal resuspension of microbiota:testing the effects of sediment cohesiveness and bioturbation using flume experiments

Gérard F. Blanchard; Pierre-Guy Sauriau; V. Cariou-Le Gall; Dominique Gouleau; MJ Garet; Frédéric Olivier;
Open Access
Published: 01 Jan 1997
Publisher: HAL CCSD
Country: France
International audience; 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-Oléron 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 results indicate that the effect of surface tracking by H. ulvae on microbial resuspension was clearly dependent on the interaction between sediment cohesiveness and shear velocity. Evidence was also found that microphytobenthos and bacteria are not simultaneously resuspended from silt-clay bioturbated sediments. This supports the theory that diatoms within the easily eroded mucus matrix behave actively and bacteria adhering to fine silt particles eroded at higher critical shear velocities behave passively.
Subjects by Vocabulary

Medical Subject Headings: fungi

Microsoft Academic Graph classification: Silt Flume Bioturbation Shear velocity Environmental science Sediment Shear stress Plankton Ecology Oceanography Benthic zone


Microphytobenthos, Bacteria, Resuspension, Bioturbation, Hydrobia ulvae, Shear velocity, Sediment cohesiveness, Flume experiment, [SDV.EE.ECO]Life Sciences [q-bio]/Ecology, environment/Ecosystems, [SDV.EE.IEO]Life Sciences [q-bio]/Ecology, environment/Symbiosis, [SDE.BE]Environmental Sciences/Biodiversity and Ecology, microphytobenthos, bacteria, resuspension, bioturbation, Hydrobia ulvae, shear velocity, sediment cohesiveness, flume experiment, Ecology, Aquatic Science, Ecology, Evolution, Behavior and Systematics

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