FN Archimer Export Format PT J TI Kinetics of tidal resuspension of microbiota: Testing the effects of sediment cohesiveness and bioturbation using flume experiments BT AF BLANCHARD, GĂ©rard F SAURIAU, P.G. CARIOU-LE GALL, Valerie GOULEAU, D GARET, MJ OLIVIER, F AS 1:1,2;2:1,2;3:1,2;4:1,2;5:1,2;6:3; FF 1:;2:;3:;4:;5:;6:; C1 IFREMER, CNRS, CTR RECH ECOL MARINE & AQUACULTURE, BP 5, F-17137 LHOUMEAU, FRANCE. CNRS, FRANCE LAB MARITIME DINARD, F-35801 DINARD, FRANCE. C2 IFREMER, FRANCE CNRS, FRANCE MNHN, FRANCE IN WOS Ifremer jusqu'en 2018 IF 1.928 TC 65 UR https://archimer.ifremer.fr/doc/00337/44789/44480.pdf LA English DT Article DE ;microphytobenthos;bacteria;resuspension;bioturbation;Hydrobia ulvae;shear velocity;sediment cohesiveness;flume experiment AB 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 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. PY 1997 SO Marine Ecology Progress Series SN 0171-8630 PU Inter-research VL 151 IS 1-3 UT A1997XE68700003 BP 17 EP 25 DI 10.3354/meps151017 ID 44789 ER EF