Figure 3 Variation in species-level taxonomic composition of marine bivalves across a latitudinal gradient along the eastern coastline of Australia. The y-axis in each panel shows the position of the point along the first axis of a Principal Coordinates Analysis (PCoA). Sites that cluster together vertically are inferred to have a similar taxonomic composition. (a ) Results from field collection. The other panels show different subsets of an OBIS dataset – the full dataset (b ), inclusive of observational data (c ) and matched to field sites (d ).