SS2.01 Effects of Biotic Interactions on the Structure and Function of Microbial Food Webs
Date: Wednesday, June 12, 2002
Time: 12:00:00 PM
Location: Saanich
TaitK, Plymouth Marine Laboratory, Plymouth, United Kingdom,
Joint, I, , Plymouth Marine Laboratory, Plymouth, United Kingdom,
Williams, P, , University of Nottingham, Nottingham, United Kingdom,
Camara, M, , University of Nottingham, Nottingham, United Kingdom,
Callow, J, A, University of Birmingham, Birmingham, United Kingdom,
Callow, M, E, University of Birmingham, Birmingham, ,
It is well known that bacteria are capable of complex assemblage behavior through cell-cell chemical communication. Quorum sensing occurs through the production of diffusible signal molecules, or autoinducers, which enable bacteria to monitor their own population density through control of gene expression. We have now demonstrated that bacteria in a biofilm will influence settlement of zoospores of the green alga Enteromorpha. Zoospores can respond to various N-acyl homoserine lactones (AHLs) – the most common bacterial signal molecules. Experiments with mutants of Vibrio anguillarum deficient in AHL production, and with synthetic AHLs, have shown that density-dependent settlement of zoospores on bacterial biofilms is related to AHL production. Therefore, bacterial quorum sensing molecules can influence the ecological success of a eucaryotic organism.