Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean
The impact of an asteroid at the Cretaceous/Paleogene (K/Pg) boundary triggered dramatic biotic, biogeochemical and sedimentological changes in the oceans that have been intensively studied. Paleo-biogeographical differences in the biotic response to the impact and its environmental consequences, ho...
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ftpangaea:oai:pangaea.de:doi:10.1594/PANGAEA.836916 2023-05-15T13:42:11+02:00 Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean Alegret, Laia Thomas, Ellen LATITUDE: -65.160000 * LONGITUDE: 1.204800 * DATE/TIME START: 1987-01-21T07:00:00 * DATE/TIME END: 1987-01-23T20:30:00 2013-10-21 application/zip, 2 datasets https://doi.pangaea.de/10.1594/PANGAEA.836916 https://doi.org/10.1594/PANGAEA.836916 en eng PANGAEA https://doi.pangaea.de/10.1594/PANGAEA.836916 https://doi.org/10.1594/PANGAEA.836916 CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess CC-BY Supplement to: Alegret, Laia; Thomas, Ellen (2013): Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean (ODP Site 690): Diversity, food and carbonate saturation. Marine Micropaleontology, 105, 40-51, https://doi.org/10.1016/j.marmicro.2013.10.003 Ocean Drilling Program ODP Dataset 2013 ftpangaea https://doi.org/10.1594/PANGAEA.836916 https://doi.org/10.1016/j.marmicro.2013.10.003 2023-01-20T07:33:21Z The impact of an asteroid at the Cretaceous/Paleogene (K/Pg) boundary triggered dramatic biotic, biogeochemical and sedimentological changes in the oceans that have been intensively studied. Paleo-biogeographical differences in the biotic response to the impact and its environmental consequences, however, have been less well documented. We present a high-resolution analysis of benthic foraminiferal assemblages at Southern Ocean ODP Site 690 (Maud Rise, Weddell Sea, Antarctica). At this high latitude site, late Maastrichtian environmental variability was high, but benthic foraminiferal assemblages were not less diverse than at lower latitudes, in contrast to those of planktic calcifiers. Also in contrast to planktic calcifiers, benthic foraminifera did not suffer significant extinction at the K/Pg boundary, but show transient assemblage changes and decreased diversity. At Site 690, the extinction rate was even lower (~3%) than at other sites. The benthic foraminiferal accumulation rate varied little across the K/Pg boundary, indicating that food supply to the sea floor was affected to a lesser extent than at lower latitude sites. Compared to Maastrichtian assemblages, Danian assemblages have a lower diversity and greater relative abundance of heavily calcified taxa such as Stensioeina beccariiformis and Paralabamina lunata. This change in benthic foraminiferal assemblages could reflect post-extinction proliferation of different photosynthesizers (thus food for the benthos) than those dominant during the Late Cretaceous, therefore changes in the nature rather than in the amount of the organic matter supplied to the seafloor. However, severe extinction of pelagic calcifiers caused carbonate supersaturation in the oceans, thus might have given competitive advantage to species with large, heavily calcified tests. This indirect effect of the K/Pg impact thus may have influenced the deep-sea dwellers, documenting the complexity of the effects of major environmental disturbance. Dataset Antarc* Antarctica Southern Ocean Weddell Sea PANGAEA - Data Publisher for Earth & Environmental Science Southern Ocean Weddell Sea Weddell Maud Rise ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(1.204800,1.204800,-65.160000,-65.160000) |
institution |
Open Polar |
collection |
PANGAEA - Data Publisher for Earth & Environmental Science |
op_collection_id |
ftpangaea |
language |
English |
topic |
Ocean Drilling Program ODP |
spellingShingle |
Ocean Drilling Program ODP Alegret, Laia Thomas, Ellen Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean |
topic_facet |
Ocean Drilling Program ODP |
description |
The impact of an asteroid at the Cretaceous/Paleogene (K/Pg) boundary triggered dramatic biotic, biogeochemical and sedimentological changes in the oceans that have been intensively studied. Paleo-biogeographical differences in the biotic response to the impact and its environmental consequences, however, have been less well documented. We present a high-resolution analysis of benthic foraminiferal assemblages at Southern Ocean ODP Site 690 (Maud Rise, Weddell Sea, Antarctica). At this high latitude site, late Maastrichtian environmental variability was high, but benthic foraminiferal assemblages were not less diverse than at lower latitudes, in contrast to those of planktic calcifiers. Also in contrast to planktic calcifiers, benthic foraminifera did not suffer significant extinction at the K/Pg boundary, but show transient assemblage changes and decreased diversity. At Site 690, the extinction rate was even lower (~3%) than at other sites. The benthic foraminiferal accumulation rate varied little across the K/Pg boundary, indicating that food supply to the sea floor was affected to a lesser extent than at lower latitude sites. Compared to Maastrichtian assemblages, Danian assemblages have a lower diversity and greater relative abundance of heavily calcified taxa such as Stensioeina beccariiformis and Paralabamina lunata. This change in benthic foraminiferal assemblages could reflect post-extinction proliferation of different photosynthesizers (thus food for the benthos) than those dominant during the Late Cretaceous, therefore changes in the nature rather than in the amount of the organic matter supplied to the seafloor. However, severe extinction of pelagic calcifiers caused carbonate supersaturation in the oceans, thus might have given competitive advantage to species with large, heavily calcified tests. This indirect effect of the K/Pg impact thus may have influenced the deep-sea dwellers, documenting the complexity of the effects of major environmental disturbance. |
format |
Dataset |
author |
Alegret, Laia Thomas, Ellen |
author_facet |
Alegret, Laia Thomas, Ellen |
author_sort |
Alegret, Laia |
title |
Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean |
title_short |
Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean |
title_full |
Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean |
title_fullStr |
Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean |
title_full_unstemmed |
Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean |
title_sort |
benthic foraminifera across the cretaceous/paleogene boundary in the southern ocean |
publisher |
PANGAEA |
publishDate |
2013 |
url |
https://doi.pangaea.de/10.1594/PANGAEA.836916 https://doi.org/10.1594/PANGAEA.836916 |
op_coverage |
LATITUDE: -65.160000 * LONGITUDE: 1.204800 * DATE/TIME START: 1987-01-21T07:00:00 * DATE/TIME END: 1987-01-23T20:30:00 |
long_lat |
ENVELOPE(3.000,3.000,-66.000,-66.000) ENVELOPE(1.204800,1.204800,-65.160000,-65.160000) |
geographic |
Southern Ocean Weddell Sea Weddell Maud Rise |
geographic_facet |
Southern Ocean Weddell Sea Weddell Maud Rise |
genre |
Antarc* Antarctica Southern Ocean Weddell Sea |
genre_facet |
Antarc* Antarctica Southern Ocean Weddell Sea |
op_source |
Supplement to: Alegret, Laia; Thomas, Ellen (2013): Benthic foraminifera across the Cretaceous/Paleogene boundary in the Southern Ocean (ODP Site 690): Diversity, food and carbonate saturation. Marine Micropaleontology, 105, 40-51, https://doi.org/10.1016/j.marmicro.2013.10.003 |
op_relation |
https://doi.pangaea.de/10.1594/PANGAEA.836916 https://doi.org/10.1594/PANGAEA.836916 |
op_rights |
CC-BY-3.0: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted info:eu-repo/semantics/openAccess |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.1594/PANGAEA.836916 https://doi.org/10.1016/j.marmicro.2013.10.003 |
_version_ |
1766164668683911168 |