THE INTERACTION BETWEEN ELMINIUS-MODESTUS DARWIN CYPRIDS AND BIOFILMS OF DELEYA-MARINA NCMB1877

The interaction between Elminius modestus Darwin cypris larvae and biofilms of Deleya marina NCMB1877 covering a range of surface types has been studied by the measurement of cypris temporary adhesion. A > 16 kDa water-soluble partial fraction of bacterial exudate significantly reduced temporary adhesion on all surfaces in a manner which was independent of the underlying surface wettability. In contrast, the underlying surface wettability influenced the effects produced by both 4-day and 1-month-old, whole biofilms. Cyprids adhered more strongly to 4-day-old films compared to control surfaces, but less strongly to 1-month-old films. We suggest that bacterium/substratum adhesion plays a significant role in the adhesion and settlement of cypris larvae. The production of stimulatory or inhibitory factors within the biofilm is dependent upon biofilm age. The interaction between underlying substratum properties and biofilm age together with the local bacterial community structure, will help to determining the degree to which a submerged surface will become fouled.