Fig. 11. Q in Palaeoecology of the Spathian Virgin Formation (Utah, USA) and its implications for the Early Triassic recovery

Fig. 11. Q (samples) and R−mode (species) cluster analysis using the unweighted paired group algorithm and Morisita index of similarity. Classes of abundances (circle size) represent the quintiles of absolute−abundance frequencies. Bootstrap values are shown in the white boxes within the Q−mode cluster. Dominance is given as D = 1−Simpson index. A. Bakevellia exporrecta Association. B. Eumorphotis ericius Association. C. Protogusarella smithi Association D. Piarorhynchella triassica Association. E. Bakevellia costata Assemblage. F. Main R−mode cluster incorporating the nuclei of several associations. G. Subcluster reflecting the nucleus of the Bakevellia exporrecta Association and it probably incorporates those species, which are adapted to low energy, softground conditions. H. Subcluster reflecting the nuclei of the Eumorphotis ericius Association and Protogusarella smithi Association, and it incorporates species adapted to high energy, near shore conditions.