Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review
Abstract A review of the palynofloral succession at the well-documented Triassic–Jurassic boundary sites – Kuhjoch (Austria), St Audrie's Bay (UK), Stenlille (Denmark), Astartekløft (Greenland), Sverdrup Basin (Arctic Canada), Northern Carnarvon Basin (Western Australia), Southeast Queensland (...
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Cambridge University Press (CUP)
2015
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Online Access: | http://dx.doi.org/10.1017/s0016756815000552 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756815000552 |
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crcambridgeupr:10.1017/s0016756815000552 2024-06-23T07:50:39+00:00 Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review LINDSTRÖM, SOFIE 2015 http://dx.doi.org/10.1017/s0016756815000552 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756815000552 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 153, issue 2, page 223-251 ISSN 0016-7568 1469-5081 journal-article 2015 crcambridgeupr https://doi.org/10.1017/s0016756815000552 2024-06-12T04:05:10Z Abstract A review of the palynofloral succession at the well-documented Triassic–Jurassic boundary sites – Kuhjoch (Austria), St Audrie's Bay (UK), Stenlille (Denmark), Astartekløft (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. Article in Journal/Newspaper Arctic Greenland sverdrup basin Cambridge University Press Arctic Canada Greenland New Zealand Queensland Geological Magazine 153 2 223 251 |
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Open Polar |
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Cambridge University Press |
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crcambridgeupr |
language |
English |
description |
Abstract A review of the palynofloral succession at the well-documented Triassic–Jurassic boundary sites – Kuhjoch (Austria), St Audrie's Bay (UK), Stenlille (Denmark), Astartekløft (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. |
format |
Article in Journal/Newspaper |
author |
LINDSTRÖM, SOFIE |
spellingShingle |
LINDSTRÖM, SOFIE Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review |
author_facet |
LINDSTRÖM, SOFIE |
author_sort |
LINDSTRÖM, SOFIE |
title |
Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review |
title_short |
Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review |
title_full |
Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review |
title_fullStr |
Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review |
title_full_unstemmed |
Palynofloral patterns of terrestrial ecosystem change during the end-Triassic event – a review |
title_sort |
palynofloral patterns of terrestrial ecosystem change during the end-triassic event – a review |
publisher |
Cambridge University Press (CUP) |
publishDate |
2015 |
url |
http://dx.doi.org/10.1017/s0016756815000552 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756815000552 |
geographic |
Arctic Canada Greenland New Zealand Queensland |
geographic_facet |
Arctic Canada Greenland New Zealand Queensland |
genre |
Arctic Greenland sverdrup basin |
genre_facet |
Arctic Greenland sverdrup basin |
op_source |
Geological Magazine volume 153, issue 2, page 223-251 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756815000552 |
container_title |
Geological Magazine |
container_volume |
153 |
container_issue |
2 |
container_start_page |
223 |
op_container_end_page |
251 |
_version_ |
1802641559702732800 |