Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change
The responses of community assemblages of planktonic and benthonic foraminifera and coccolithophorids to transient climate change are explored for the uppermost 2 m of cores ODP677B (1.2°N; 83.74°W, 3461 m) and TR163-38 (1.34°S; 81.58°W, 2200 m), for the last ~ 40 ka. Results suggest that the deglac...
Published in: | Palaeogeography, Palaeoclimatology, Palaeoecology |
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Format: | Article in Journal/Newspaper |
Language: | English |
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Online Access: | http://hdl.handle.net/10784/26878 https://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1480 https://doi.org/10.1016/j.palaeo.2005.10.022 |
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ftuniveafit:oai:repository.eafit.edu.co:10784/26878 2023-05-15T17:14:57+02:00 Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change Martinez, Ignacio Rincon, Daniel Yokoyama, Yusuke Barrows, Timothy Universidad EAFIT. Departamento de Geología Ciencias del Mar 2006-05-03 application/pdf http://hdl.handle.net/10784/26878 https://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1480 https://doi.org/10.1016/j.palaeo.2005.10.022 eng eng ELSEVIER SCIENCE BV https://www.scopus.com/inward/record.uri?eid=2-s2.0-33646115800&doi=10.1016%2fj.palaeo.2005.10.022&partnerID=40&md5=67b02020382311967947f454c64fb545 https://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1480 00310182 1872616X WOS;000237610800008 SCOPUS;2-s2.0-33646115800 http://hdl.handle.net/10784/26878 doi:10.1016/j.palaeo.2005.10.022 https://v2.sherpa.ac.uk/id/publication/issn/0031-0182 PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY benthos climate change deglaciation Holocene oceanography planktonic foraminifera seafloor Central America Pacific Ocean Panama [Central America] Florisphaera Foraminifera Gephyrocapsa oceanica Globigerina bulloides Globorotalia Globorotalia inflata Haptophyceae Neogloboquadrina pachyderma info:eu-repo/semantics/article article info:eu-repo/semantics/publishedVersion publishedVersion Artículo 2006 ftuniveafit https://doi.org/10.1016/j.palaeo.2005.10.022 2022-09-18T00:00:39Z The responses of community assemblages of planktonic and benthonic foraminifera and coccolithophorids to transient climate change are explored for the uppermost 2 m of cores ODP677B (1.2°N; 83.74°W, 3461 m) and TR163-38 (1.34°S; 81.58°W, 2200 m), for the last ~ 40 ka. Results suggest that the deglaciation interval was a time of increased productivity and a major reorganization of planktonic trophic webs. The succession in dominance between the planktonic foraminifera species Globorotalia inflata, Globigerina bulloides, and Neogloboquadrina pachyderma denote four periods of oceanographic change: (1) advection (24-20 ka), (2) strong upwelling (20-15 ka), (3) weak upwelling (14-8 ka) and (4) oligotrophy (8 ka to present). Strong upwelling for the deglaciation interval is supported by the low Florisphaera profunda/other coccolithophorids ratio and the high percentage abundance of Gephyrocapsa oceanica. Benthonic foraminifera assemblage changes are different in both cores and suggest significant regional variations in surface productivity and/or oxygen content at the seafloor, and a decoupling between surface productivity and export production to the seafloor. This decoupling is evidenced by the inverse relationship between the percentage abundance of infaunal benthonic foraminifera and the percentage abundance of N. pachyderma. The terrigenous input of the Colombian Pacific rivers, particularly the San Juan River, is suggested as a possible mechanism. Finally, the Globorotalia cultrata/Neogloboquadrina dutertrei ratio is used to reconstruct the past influence of the Costa Rica Dome-Panama Bight and cold tongue upwelling systems in the Panama Basin. A northern influence is suggested for the late Holocene (after 5 ka) and the last glacial (before 20 ka), whereas a southern influence is suggested for the 20-5 ka interval. There is a correspondence between our reconstructed northern and southern influences and previously proposed positions of the Intertropical Convergence Zone (ITCZ) after the Last Glacial Maximum ... Article in Journal/Newspaper Neogloboquadrina pachyderma Planktonic foraminifera Universidad EAFIT, Medellin: Repositorio Institucional Pacific San Juan Palaeogeography, Palaeoclimatology, Palaeoecology 234 1 114 126 |
institution |
Open Polar |
collection |
Universidad EAFIT, Medellin: Repositorio Institucional |
op_collection_id |
ftuniveafit |
language |
English |
topic |
benthos climate change deglaciation Holocene oceanography planktonic foraminifera seafloor Central America Pacific Ocean Panama [Central America] Florisphaera Foraminifera Gephyrocapsa oceanica Globigerina bulloides Globorotalia Globorotalia inflata Haptophyceae Neogloboquadrina pachyderma |
spellingShingle |
benthos climate change deglaciation Holocene oceanography planktonic foraminifera seafloor Central America Pacific Ocean Panama [Central America] Florisphaera Foraminifera Gephyrocapsa oceanica Globigerina bulloides Globorotalia Globorotalia inflata Haptophyceae Neogloboquadrina pachyderma Martinez, Ignacio Rincon, Daniel Yokoyama, Yusuke Barrows, Timothy Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change |
topic_facet |
benthos climate change deglaciation Holocene oceanography planktonic foraminifera seafloor Central America Pacific Ocean Panama [Central America] Florisphaera Foraminifera Gephyrocapsa oceanica Globigerina bulloides Globorotalia Globorotalia inflata Haptophyceae Neogloboquadrina pachyderma |
description |
The responses of community assemblages of planktonic and benthonic foraminifera and coccolithophorids to transient climate change are explored for the uppermost 2 m of cores ODP677B (1.2°N; 83.74°W, 3461 m) and TR163-38 (1.34°S; 81.58°W, 2200 m), for the last ~ 40 ka. Results suggest that the deglaciation interval was a time of increased productivity and a major reorganization of planktonic trophic webs. The succession in dominance between the planktonic foraminifera species Globorotalia inflata, Globigerina bulloides, and Neogloboquadrina pachyderma denote four periods of oceanographic change: (1) advection (24-20 ka), (2) strong upwelling (20-15 ka), (3) weak upwelling (14-8 ka) and (4) oligotrophy (8 ka to present). Strong upwelling for the deglaciation interval is supported by the low Florisphaera profunda/other coccolithophorids ratio and the high percentage abundance of Gephyrocapsa oceanica. Benthonic foraminifera assemblage changes are different in both cores and suggest significant regional variations in surface productivity and/or oxygen content at the seafloor, and a decoupling between surface productivity and export production to the seafloor. This decoupling is evidenced by the inverse relationship between the percentage abundance of infaunal benthonic foraminifera and the percentage abundance of N. pachyderma. The terrigenous input of the Colombian Pacific rivers, particularly the San Juan River, is suggested as a possible mechanism. Finally, the Globorotalia cultrata/Neogloboquadrina dutertrei ratio is used to reconstruct the past influence of the Costa Rica Dome-Panama Bight and cold tongue upwelling systems in the Panama Basin. A northern influence is suggested for the late Holocene (after 5 ka) and the last glacial (before 20 ka), whereas a southern influence is suggested for the 20-5 ka interval. There is a correspondence between our reconstructed northern and southern influences and previously proposed positions of the Intertropical Convergence Zone (ITCZ) after the Last Glacial Maximum ... |
author2 |
Universidad EAFIT. Departamento de Geología Ciencias del Mar |
format |
Article in Journal/Newspaper |
author |
Martinez, Ignacio Rincon, Daniel Yokoyama, Yusuke Barrows, Timothy |
author_facet |
Martinez, Ignacio Rincon, Daniel Yokoyama, Yusuke Barrows, Timothy |
author_sort |
Martinez, Ignacio |
title |
Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change |
title_short |
Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change |
title_full |
Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change |
title_fullStr |
Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change |
title_full_unstemmed |
Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change |
title_sort |
foraminifera and coccolithophorid assemblage changes in the panama basin during the last deglaciation: response to sea-surface productivity induced by a transient climate change |
publisher |
ELSEVIER SCIENCE BV |
publishDate |
2006 |
url |
http://hdl.handle.net/10784/26878 https://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1480 https://doi.org/10.1016/j.palaeo.2005.10.022 |
geographic |
Pacific San Juan |
geographic_facet |
Pacific San Juan |
genre |
Neogloboquadrina pachyderma Planktonic foraminifera |
genre_facet |
Neogloboquadrina pachyderma Planktonic foraminifera |
op_source |
PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY |
op_relation |
https://www.scopus.com/inward/record.uri?eid=2-s2.0-33646115800&doi=10.1016%2fj.palaeo.2005.10.022&partnerID=40&md5=67b02020382311967947f454c64fb545 https://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1480 00310182 1872616X WOS;000237610800008 SCOPUS;2-s2.0-33646115800 http://hdl.handle.net/10784/26878 doi:10.1016/j.palaeo.2005.10.022 |
op_rights |
https://v2.sherpa.ac.uk/id/publication/issn/0031-0182 |
op_doi |
https://doi.org/10.1016/j.palaeo.2005.10.022 |
container_title |
Palaeogeography, Palaeoclimatology, Palaeoecology |
container_volume |
234 |
container_issue |
1 |
container_start_page |
114 |
op_container_end_page |
126 |
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1766073059487252480 |