Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review

摘要: A review of the palynofloral succession at well-documented Triassic–Jurassic boundary sites – Kuhjoch (Austria), St Audrie's Bay (UK), Stenlille (Denmark), Astartekloft (Greenland), Sverdrup Basin (Arctic Canada), Northern Carnarvon (Western Australia), Southeast Queensland (eastern Australia) and New Zealand show all experienced major to moderate re-organization terrestrial vegetation during end-Triassic event. The changes led subsequent taxonomic losses between 17% 73% Rhaetian pre-extinction palynoflora. majority typical taxa that disappear are so far not known from in situ occurrences reproductive structures macrofossil plant taxa. From an ecological perspective, most dramatic occurred Basin, Stenlille, where pre- post-extinction palynofloras were fundamentally different both composition dominance. These correspond severity Category I McGhee et al. (2004), while remaining placed their Subcategory IIa because there ecosystems disrupted, but recover replaced post-extinction. Increased total abundances spores on hemispheres extinction recovery intervals may indicate environmental and/or climatic conditions became less favourable for seed plants. Such include expected effects volcanism Central Atlantic Magmatic Province, such as acid rain, soil freshwater acidification due volcanic sulfur dioxide emissions, fluctuating ultraviolet flux ozone depletion caused by halogens halocarbon compounds, drastic greenhouse gas emissions.