Fig. 3From: Settlement Behavior of Zoospores of Ulva linza During Surface Selection Studied by Digital Holographic MicroscopyInteraction of zoospores with polyethylene glycol coating (PEG), acid washed glass (AWG) and tridecafluoroctyl-triethoxysilane (FOTS) coated surfaces. a Mean spore velocity during the first 2 min after spore injection at different distances above the surface. b Velocity deceleration of exploring spores in close proximity (0–30 µm) of the surface as compared to the speed in the bulk water. c Number of spores settled on the surface in a standard assay after 45 min. The glass samples used in this assay were Nexterion glassBack to article page