Figure 3
From: Fatty acid analysis as a tool to infer the diet in Illinois river otters (Lontra canadensis)
Principal components analysis of fatty acids in five mollusc species in Illinois. The data from 60 unique fatty acids projected onto the first two principal components (jointly accounting for 40.6% of the total variance in their fatty acid profiles). Asian clams (Corbicula fluminea, an invasive species) and the round pigtoe (Pleurobema sintoxia) form clusters, whereas the three-ridge (Amblema plicata), Wabash pigtoe (Fusconaia flava), and fat mucket (Lampsilis siliquoidea), have fatty acid profiles that form less distinct clusters with some overlap between individuals.