Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum?
The symbiont-bearing mixed-layer planktic foraminiferal genera Morozovella and Acarinina were among the most important calcifiers of early Paleogene tropical–subtropical oceans. A marked and permanent switch in the abundance of these genera is known to have occurred at low-latitude sites at the begi...
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Online Access: | http://hdl.handle.net/11392/2379410 https://doi.org/10.1002/2017PA003138 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2017PA003138 |
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ftunivferrarair:oai:iris.unife.it:11392/2379410 2024-02-11T10:07:14+01:00 Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? Luciani, Valeria D'Onofrio, Roberta Dickens, Gerald R. Wade, Bridget S. Luciani, Valeria D'Onofrio, Roberta Dickens, Gerald R. Wade, Bridget S. 2017 STAMPA http://hdl.handle.net/11392/2379410 https://doi.org/10.1002/2017PA003138 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2017PA003138 eng eng info:eu-repo/semantics/altIdentifier/pmid/29398777 info:eu-repo/semantics/altIdentifier/wos/WOS:000418169800003 volume:32 issue:11 firstpage:1115 lastpage:1136 numberofpages:22 journal:PALEOCEANOGRAPHY http://hdl.handle.net/11392/2379410 doi:10.1002/2017PA003138 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85030480770 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2017PA003138 info:eu-repo/semantics/openAccess Planktic foraminifera Early Eocene Oxygen and carbon stable isotopes Bleaching info:eu-repo/semantics/article 2017 ftunivferrarair https://doi.org/10.1002/2017PA003138 2024-01-24T17:39:34Z The symbiont-bearing mixed-layer planktic foraminiferal genera Morozovella and Acarinina were among the most important calcifiers of early Paleogene tropical–subtropical oceans. A marked and permanent switch in the abundance of these genera is known to have occurred at low-latitude sites at the beginning of the Early Eocene Climatic Optimum(EECO), such that the relative abundance of Morozovella permanently and significantly decreased along with a progressive reduction in the number of species; concomitantly, the genus Acarinina almost doubled its abundance and diversified. Here we examine planktic foraminiferal assemblages and stable isotope compositions of their tests at Ocean Drilling Program Site 1051 (northwest Atlantic) to detail the timing of this biotic event, to document its details at the species level, and to test a potential cause: the loss of photosymbionts (bleaching). We also provide stable isotope measurements of bulk carbonate to refine the stratigraphy at Site 1051 and to determine when changes in Morozovella species composition and their test size occurred. We demonstrate that the switch in Morozovella and Acarinina abundance occurred rapidly and in coincidence with a negative carbon isotope excursion known as the J event (~53 Ma), which marks the start of the EECO.We provide evidence of photosymbiont loss after the J event from a size-restricted δ13C analysis. However, such inferred bleaching was transitory and also occurred in the acarininids. The geologically rapid switch in planktic foraminiferal genera during the early Eocene was a major evolutionary change within marine biota, but loss of photosymbionts was not the primary causal mechanism. Article in Journal/Newspaper Northwest Atlantic Università degli Studi di Ferrara: CINECA IRIS Paleoceanography 32 11 1115 1136 |
institution |
Open Polar |
collection |
Università degli Studi di Ferrara: CINECA IRIS |
op_collection_id |
ftunivferrarair |
language |
English |
topic |
Planktic foraminifera Early Eocene Oxygen and carbon stable isotopes Bleaching |
spellingShingle |
Planktic foraminifera Early Eocene Oxygen and carbon stable isotopes Bleaching Luciani, Valeria D'Onofrio, Roberta Dickens, Gerald R. Wade, Bridget S. Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? |
topic_facet |
Planktic foraminifera Early Eocene Oxygen and carbon stable isotopes Bleaching |
description |
The symbiont-bearing mixed-layer planktic foraminiferal genera Morozovella and Acarinina were among the most important calcifiers of early Paleogene tropical–subtropical oceans. A marked and permanent switch in the abundance of these genera is known to have occurred at low-latitude sites at the beginning of the Early Eocene Climatic Optimum(EECO), such that the relative abundance of Morozovella permanently and significantly decreased along with a progressive reduction in the number of species; concomitantly, the genus Acarinina almost doubled its abundance and diversified. Here we examine planktic foraminiferal assemblages and stable isotope compositions of their tests at Ocean Drilling Program Site 1051 (northwest Atlantic) to detail the timing of this biotic event, to document its details at the species level, and to test a potential cause: the loss of photosymbionts (bleaching). We also provide stable isotope measurements of bulk carbonate to refine the stratigraphy at Site 1051 and to determine when changes in Morozovella species composition and their test size occurred. We demonstrate that the switch in Morozovella and Acarinina abundance occurred rapidly and in coincidence with a negative carbon isotope excursion known as the J event (~53 Ma), which marks the start of the EECO.We provide evidence of photosymbiont loss after the J event from a size-restricted δ13C analysis. However, such inferred bleaching was transitory and also occurred in the acarininids. The geologically rapid switch in planktic foraminiferal genera during the early Eocene was a major evolutionary change within marine biota, but loss of photosymbionts was not the primary causal mechanism. |
author2 |
Luciani, Valeria D'Onofrio, Roberta Dickens, Gerald R. Wade, Bridget S. |
format |
Article in Journal/Newspaper |
author |
Luciani, Valeria D'Onofrio, Roberta Dickens, Gerald R. Wade, Bridget S. |
author_facet |
Luciani, Valeria D'Onofrio, Roberta Dickens, Gerald R. Wade, Bridget S. |
author_sort |
Luciani, Valeria |
title |
Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? |
title_short |
Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? |
title_full |
Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? |
title_fullStr |
Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? |
title_full_unstemmed |
Did Photosymbiont Bleaching Lead to the Demise of Planktic Foraminifer Morozovella at the Early Eocene Climatic Optimum? |
title_sort |
did photosymbiont bleaching lead to the demise of planktic foraminifer morozovella at the early eocene climatic optimum? |
publishDate |
2017 |
url |
http://hdl.handle.net/11392/2379410 https://doi.org/10.1002/2017PA003138 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2017PA003138 |
genre |
Northwest Atlantic |
genre_facet |
Northwest Atlantic |
op_relation |
info:eu-repo/semantics/altIdentifier/pmid/29398777 info:eu-repo/semantics/altIdentifier/wos/WOS:000418169800003 volume:32 issue:11 firstpage:1115 lastpage:1136 numberofpages:22 journal:PALEOCEANOGRAPHY http://hdl.handle.net/11392/2379410 doi:10.1002/2017PA003138 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85030480770 https://agupubs.onlinelibrary.wiley.com/doi/10.1002/2017PA003138 |
op_rights |
info:eu-repo/semantics/openAccess |
op_doi |
https://doi.org/10.1002/2017PA003138 |
container_title |
Paleoceanography |
container_volume |
32 |
container_issue |
11 |
container_start_page |
1115 |
op_container_end_page |
1136 |
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1790605407101648896 |