Changes in terrestrial floras at the Triassic-Jurassic Boundary in Europe

摘要: Abstract One of the biggest mass extinctions took place at Triassic-Jurassic Boundary. It affected both marine and terrestrial ecosystems, caused disappearance many animal taxa, mostly ones. Its influence on floral changes has been widely discussed, with arguments offered for sudden extinction plants over vast areas, or, alternatively, slow, less extensive changes. The aim this study was to statistically verify in plant composition during TJB Europe, examine type extent these Data from Polish localities, an interesting new addition floristic data TJB, were compared those other selected localities Europe. database contains 311 macroflora taxa 106 (16 Polish) 13 countries, grouped into 29 regions; 571 microflora 105 (29 11 37 regions. analysed cover period Anisian Toarcian stages. Range-based metrics diversity dynamics calculated show trends studied time interval, focus being TJB. Due strong disproportions number occurrences, Rhaetian Hettangian stages overrepresented. warm humid climate promoted led formation numerous broad floodplains conducive preservation remains (e.g. coal). patterns established by raw analyses also assessed applying a sampling standardisation procedure. Our results, based accurate Poland rest confirm visualize scenario which there no significant Hierarchical clustering suggests that local habitat conditions are key factor grouping similar composition, differences between floras not associated dimension (stages).