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

Sofie Lindstrom
Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event; a review (in Mass extinctions, Bas van de Schootbrugge (prefacer) and Paul B. Wignall (prefacer))
Geological Magazine (March 2016) 153 (2): 223-251

Abstract

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


ISSN: 0016-7568
EISSN: 1469-5081
Coden: GEMGA4
Serial Title: Geological Magazine
Serial Volume: 153
Serial Issue: 2
Title: Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event; a review
Title: Mass extinctions
Author(s): Lindstrom, Sofie
Author(s): van de Schootbrugge, Basprefacer
Author(s): Wignall, Paul B.prefacer
Affiliation: Geological Survey of Denmark and Greenland, Copenhagen, Denmark
Affiliation: Utrecht University, Institute of Earth Sciences, Netherlands
Pages: 223-251
Published: 201603
Text Language: English
Publisher: Cambridge University Press, London, United Kingdom
References: 123
Accession Number: 2016-028270
Categories: StratigraphyPaleobotany
Document Type: Serial
Bibliographic Level: Analytic
Illustration Description: illus. incl. 4 tables
S27°00'00" - S21°00'00", E114°30'00" - E116°00'00"
Secondary Affiliation: University of Leeds, GBR, United Kingdom
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2017, American Geosciences Institute. Abstract, Copyright, Cambridge University Press. Reference includes data from GeoScienceWorld, Alexandria, VA, United States
Update Code: 201614
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