Peters, F. Institute of Marine Sciences (CSIC), cesc@icm.csic.es
Marrase, C. Institute of Marine Sciences (CSIC), celia@icm.csic.es
Havskum, H. VKI, hha@vki.dk
Rassoulzadegan, F. URA-CNRS 2077, University of Paris, rassoul@obs-vlfr.fr
Dolan, J. URA-CNRS 2077, University of Paris, dolan@obs-vlfr.fr
Gasol, M. Institute of Marine Sciences (CSIC), pepgasol@icm.csic.es
Alcaraz, . Institute of Marine Sciences (CSIC), miquel@icm.csic.es
Estrada, M. Institute of Marine Sciences (CSIC), marta@icm.csic.es

 
GRAZING AND THE INDIRECT EFFECTS OF TURBULENCE ON BACTERIAL GROWTH
 
From previous experiments with natural microbial communities we know that bacterial populations can show differences in biomass and growth under turbulence with respect to still water controls. This effect is not a direct one, but most likely cascades down from effects of turbulence at higher trophic levels. We performed bacterial grazing experiments with NW Mediterranean water, for different water size fractions and enrichment conditions. In 8 out of 10 experiments, grazing on bacteria was lower under turbulence (43%) with respect to still water, which would explain some of the observed bacterial dynamics. These results are combined with other data of the effects of turbulence on microbial grazing pressures and are discussed in comparison to theoretical considerations and modelling-derived data.
 
Day: Tuesday, Feb. 2
Time: 12:00 - 12:15pm
Location: Hilton of Santa Fe
 
Code: SS02TU1200H