Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes
The Paleogene evolutionary records of planktonic foraminifera and larger benthic foraminifera show parallel patterns in development that may, in part, reflect changes in nutrient flux to surface waters. Following the terminal Cretaceous extinctions, faunas were dominated by a few cosmopolitan opport...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Language: | unknown |
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Digital Commons @ University of South Florida
1991
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Online Access: | https://digitalcommons.usf.edu/msc_facpub/982 https://doi.org/10.1016/0031-0182(91)90075-3 |
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ftunisfloridatam:oai:digitalcommons.usf.edu:msc_facpub-2002 2023-05-15T18:00:59+02:00 Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes Hallock, Pamela Silva, Isabella P. Boersma, Anne 1991-02-01T08:00:00Z https://digitalcommons.usf.edu/msc_facpub/982 https://doi.org/10.1016/0031-0182(91)90075-3 unknown Digital Commons @ University of South Florida https://digitalcommons.usf.edu/msc_facpub/982 https://doi.org/10.1016/0031-0182(91)90075-3 Marine Science Faculty Publications Life Sciences article 1991 ftunisfloridatam https://doi.org/10.1016/0031-0182(91)90075-3 2021-10-09T07:51:36Z The Paleogene evolutionary records of planktonic foraminifera and larger benthic foraminifera show parallel patterns in development that may, in part, reflect changes in nutrient flux to surface waters. Following the terminal Cretaceous extinctions, faunas were dominated by a few cosmopolitan opportunistic species. More specialized k-strategists in both groups diversified during the Paleocene, dominating into the early Eocene, consistent with he globally mild climatic regime and probable limited rates of nutrient flux to surface waters. High-latitude cooling intensified in the middle Eocene, promoting diversification of less specialized taxa characteristic of cooler and deeper waters, higher latitudes, meridional upwelling zones, and boundary currents. Geographic ranges of warm-water taxa diminished and fragmented, yet many species survived. Thus, global diversities during the middle Eocene were the highest in the Cenozoic. As cooling and increased rates of nutrient flux further intensified in the late Eocene, extinction rates of warm-water planktonic and larger benthic species exceeded origination rates of cooler water and less specialized forms, so diversity dropped to intermediate levels where it remained through the late Eocene and Oligocene. Previous observations that planktonic foraminiferal faunas dominated by warm-water taxa are often replaced by cool-water faunas, even though oxygen isotopes only recorded relatively minor cooling, can be reconciled by the explanation that the biotic communities responded to changes in trophic resources and euphotic habitats that accompany the temperature reduction, as well as to temperature change itself. Article in Journal/Newspaper Planktonic foraminifera Digital Commons University of South Florida (USF) Palaeogeography, Palaeoclimatology, Palaeoecology 83 1-3 49 64 |
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Open Polar |
collection |
Digital Commons University of South Florida (USF) |
op_collection_id |
ftunisfloridatam |
language |
unknown |
topic |
Life Sciences |
spellingShingle |
Life Sciences Hallock, Pamela Silva, Isabella P. Boersma, Anne Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes |
topic_facet |
Life Sciences |
description |
The Paleogene evolutionary records of planktonic foraminifera and larger benthic foraminifera show parallel patterns in development that may, in part, reflect changes in nutrient flux to surface waters. Following the terminal Cretaceous extinctions, faunas were dominated by a few cosmopolitan opportunistic species. More specialized k-strategists in both groups diversified during the Paleocene, dominating into the early Eocene, consistent with he globally mild climatic regime and probable limited rates of nutrient flux to surface waters. High-latitude cooling intensified in the middle Eocene, promoting diversification of less specialized taxa characteristic of cooler and deeper waters, higher latitudes, meridional upwelling zones, and boundary currents. Geographic ranges of warm-water taxa diminished and fragmented, yet many species survived. Thus, global diversities during the middle Eocene were the highest in the Cenozoic. As cooling and increased rates of nutrient flux further intensified in the late Eocene, extinction rates of warm-water planktonic and larger benthic species exceeded origination rates of cooler water and less specialized forms, so diversity dropped to intermediate levels where it remained through the late Eocene and Oligocene. Previous observations that planktonic foraminiferal faunas dominated by warm-water taxa are often replaced by cool-water faunas, even though oxygen isotopes only recorded relatively minor cooling, can be reconciled by the explanation that the biotic communities responded to changes in trophic resources and euphotic habitats that accompany the temperature reduction, as well as to temperature change itself. |
format |
Article in Journal/Newspaper |
author |
Hallock, Pamela Silva, Isabella P. Boersma, Anne |
author_facet |
Hallock, Pamela Silva, Isabella P. Boersma, Anne |
author_sort |
Hallock, Pamela |
title |
Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes |
title_short |
Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes |
title_full |
Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes |
title_fullStr |
Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes |
title_full_unstemmed |
Similarities between Planktonic and Larger Foraminiferal Evolutionary Trends through Paleogene Paleoceanographic Changes |
title_sort |
similarities between planktonic and larger foraminiferal evolutionary trends through paleogene paleoceanographic changes |
publisher |
Digital Commons @ University of South Florida |
publishDate |
1991 |
url |
https://digitalcommons.usf.edu/msc_facpub/982 https://doi.org/10.1016/0031-0182(91)90075-3 |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
Marine Science Faculty Publications |
op_relation |
https://digitalcommons.usf.edu/msc_facpub/982 https://doi.org/10.1016/0031-0182(91)90075-3 |
op_doi |
https://doi.org/10.1016/0031-0182(91)90075-3 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
83 |
container_issue |
1-3 |
container_start_page |
49 |
op_container_end_page |
64 |
_version_ |
1766170290313756672 |