TURNOVER OF DOMINANT BENTHIC TAXA IN THE EARLY TRIASSIC
Our results show that disaster taxa experience a peak in ecologically importance during the first 1 Ma interval following the end-Permian extinction event, specifically, they representa high proportion of individuals (approx. 75%) reported fromPaleobiology Database abundance data and bulk collections from the field. In the Smithian and Spathian stages of the Early Triassic, disaster taxa are reduced in ecological importance. Claraia and “Lingula”, which are associated with dysaerobic facies, are diminished in importance in the Smithian. Despite the reduced importance of the disaster taxa as a group, community unevenness remains surprisingly high when new taxa take over as the dominant group after the Dienerian. This turnover suggests changing ecological responses to abiotic events and may indicate a shift in the importance of low oxygen conditions to high temperature regimes resulted in the suppressed recovery and persistent high dominance faunas. Ongoing work will seek to link high resolution geochemical signals of environmental perturbations with community ecological responses to explore the implications of the Early Triassic turnover of dominant taxa.