Fig. 6
Effect of substrata type composition on adult Crepidula fornicata densities and dispersal in the Milford Haven Waterway. a Correlation between two dominant substrata classes (fine sediment, grain size <16 mm, and gravel, grain size 16–256 mm) in the intertidal and subtidal transects. b Intertidal percentage cover of gravel versus average C. fornicata density of each intertidal transect. c Subtidal percentage cover of gravel versus average density of each subtidal transect. d Intertidal percentage cover of gravel versus average stack sizes. e Intertidal percentage cover of gravel versus the percentage of primary substrata that were gravel. f Intertidal percentage cover of live mussels Mytilus edulis versus the percentage of primary attachment substrata that were live mussels. Markers are means of all transects with densities >0.1 individuals m−2. All percentage data were arcsine square-root-transformed and densities log10-transformed to fulfil assumptions of homoscedasticity and normality