georefid:2004-003409SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-06-23T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1130/G19834.12003-01-01publicationgeorefid:2004-003409doi:10.1130/G19834.1Chaisson, W. P.University of Rochester, Department of Earth and Environmental Sciences, Rochester, NY, United StatesauthorGeological Society of America (GSA), Boulder, CO, United StatespublisherdocumentHardcopyGeology (Boulder)31 (12)1085-1088Biostratigraphic and isotopic studies of planktic foraminifera suggest that early to middle Pliocene closure of the Central American Seaway caused vicariant speciation among previously cosmopolitan menardellid foraminifera. New morphospecies were restricted to the tropical Atlantic. Isotopic data suggest that newly evolved Atlantic menardellids were adapted to more oligotrophic conditions, living higher in the water column than ancestral forms and perhaps harboring photosymbionts. In the late Pliocene, all but one menardellid morphospecies became extinct. These extinctions coincided with a progressive increase in the amplitude of periodic climatic change and the end of isolated tropical Atlantic surface circulation as Northern Hemisphere glaciation intensified.completedStratigraphyAtlantic OceanbiogeographybiostratigraphyC-13/C-12carbonCeara RiseCenozoicCentral American Seawayclimate changeextinctionForaminiferaice sheetsInvertebrataisotope ratiosisotopesLeg 154MenardellamicrofossilsNeogeneNorth AtlanticO-18/O-16Ocean Drilling ProgramODP Site 925oxygenpaleo-oceanographypaleoclimatologypaleoecologypaleoenvironmentplanktonic taxaPlioceneProtistastable isotopesTertiaryurn:org.iodp:exp:154urnlargerWorkCitationcampaignurn:org.iodp:exp:154:site:925urnlargerWorkCitationstudyurn:org.iodp:exp:154urnlargerWorkCitationcampaignEnglishgeoscientificInformation-43.2922-43.29204.12154.1216