Foraminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate change

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dc.citation.journalTitlePALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
dc.contributor.authorMartinez, Ignaciospa
dc.contributor.authorRincon, Danielspa
dc.contributor.authorYokoyama, Yusukespa
dc.contributor.authorBarrows, Timothyspa
dc.contributor.departmentUniversidad EAFIT. Departamento de Geologíaspa
dc.contributor.researchgroupCiencias del Marspa
dc.date.accessioned2021-03-23T20:20:24Z
dc.date.available2021-03-23T20:20:24Z
dc.date.issued2006-05-03
dc.description.abstractThe 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 (LGM). © 2005 Elsevier B.V. All rights reserved.eng
dc.identifierhttps://eafit.fundanetsuite.com/Publicaciones/ProdCientif/PublicacionFrw.aspx?id=1480
dc.identifier.doi10.1016/j.palaeo.2005.10.022
dc.identifier.issn00310182
dc.identifier.issn1872616X
dc.identifier.otherWOS;000237610800008
dc.identifier.otherSCOPUS;2-s2.0-33646115800
dc.identifier.urihttp://hdl.handle.net/10784/26878
dc.language.isoengeng
dc.publisherELSEVIER SCIENCE BV
dc.relation.urihttps://www.scopus.com/inward/record.uri?eid=2-s2.0-33646115800&doi=10.1016%2fj.palaeo.2005.10.022&partnerID=40&md5=67b02020382311967947f454c64fb545
dc.rightshttps://v2.sherpa.ac.uk/id/publication/issn/0031-0182
dc.sourcePALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
dc.subject.keywordbenthoseng
dc.subject.keywordclimate changeeng
dc.subject.keyworddeglaciationeng
dc.subject.keywordHoloceneeng
dc.subject.keywordoceanographyeng
dc.subject.keywordplanktonic foraminiferaeng
dc.subject.keywordseaflooreng
dc.subject.keywordCentral Americaeng
dc.subject.keywordPacific Oceaneng
dc.subject.keywordPanama [Central America]eng
dc.subject.keywordFlorisphaeraeng
dc.subject.keywordForaminiferaeng
dc.subject.keywordGephyrocapsa oceanicaeng
dc.subject.keywordGlobigerina bulloideseng
dc.subject.keywordGloborotaliaeng
dc.subject.keywordGloborotalia inflataeng
dc.subject.keywordHaptophyceaeeng
dc.subject.keywordNeogloboquadrina pachydermaeng
dc.titleForaminifera and coccolithophorid assemblage changes in the Panama Basin during the last deglaciation: Response to sea-surface productivity induced by a transient climate changeeng
dc.typeinfo:eu-repo/semantics/articleeng
dc.typearticleeng
dc.typeinfo:eu-repo/semantics/publishedVersioneng
dc.typepublishedVersioneng
dc.type.localArtículospa

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