georefid:2011-045407SEDIS Publication Catalogue

ana.macario@awi.de

http://sedis.iodp.org/pub-catalogue/informationpointOfContact2011-07-06T00:00:00Zhttp://sedis.iodp.org/pub-catalogue/index.php?id=10.1073/pnas.08050391052008-01-01publicationgeorefid:2011-045407doi:10.1073/pnas.0805039105Alizon, SamuelQueen's University, Department of Mathematics and Statistics, Kingston, ON, CanadaauthorKucera, MichalEberhard Karls Universitaet Tuebingen, GermanyauthorJansen, Vincent A. A.Royal Holloway, University of London, United KingdomauthorNational Academy of Sciences, Washington, DC, United StatespublisherdocumentHardcopyProceedings of the National Academy of Sciences of the United States of America105 (34)12382-12386Gradual evolution is a common phenomenon in the fossil record of marine microplankton, yet no theoretical model has so far been presented to explain the observed pattern of unidirectionality in trait evolution lasting over tens of millions of generations. Recent molecular genetic data show that the majority of microfossil-producing plankton groups harbors substantial cryptic diversity. Here, we examine the effect of cryptic diversity on apparent rates of lineage evolution. By using a theoretical approach, we show that under resource competition, an increasing number of sibling species within a hypothetical lineage leads to an exponential slowdown of the apparent rate of evolution. This mechanism explains both the remarkable variation in apparent rates of evolution observed in marine plankton, as well as the presence of long gradual evolutionary trendscompletedStratigraphyInvertebrate paleontologyAtlantic Oceanbiodiversitybiologic evolutioncoilingContusotruncanaCretaceouscryptic taxaDeep Sea Drilling ProjectDSDP Site 384DSDP Site 525equationsFohsellaForaminiferaGlobigerinaceaGlobigerinidaeGloboconellaInvertebrataIPODLeg 43Leg 74marine environmentMesozoicmicrofossilsNorth AtlanticOrbulinapaleoecologyplanktonplanktonic taxaProtistaratesRotaliinashape analysisshellsSouth AtlanticSphaeroidinellaUpper CretaceousWalvis Ridgeurn:org.iodp:exp:43urnlargerWorkCitationcampaignurn:org.iodp:exp:74urnlargerWorkCitationcampaignurn:org.iodp:exp:43:site:384urnlargerWorkCitationstudyurn:org.iodp:exp:43urnlargerWorkCitationcampaignurn:org.iodp:exp:74:site:525urnlargerWorkCitationstudyurn:org.iodp:exp:74urnlargerWorkCitationcampaignEnglishgeoscientificInformation-51.39482.5908-29.041540.2139Supplemental information/data is available in the online version of this article