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dc.contributor.authorAlsos, Inger Greve
dc.contributor.authorLammers, Youri
dc.contributor.authorKjellman, Sofia Elisabeth
dc.contributor.authorMerkel, Marie Føreid
dc.contributor.authorBender, Emma Marie
dc.contributor.authorRouillard, Alexandra
dc.contributor.authorErlendsson, Egill
dc.contributor.authorGudmundsdottir, Esther Ruth
dc.contributor.authorBenediktsson, Ívar Örn
dc.contributor.authorFarnsworth, Wesley Randall
dc.contributor.authorBrynjólfsson, Skafti
dc.contributor.authorGísladóttir, Guðrún
dc.contributor.authorEddudóttir, Sigrún Dögg
dc.contributor.authorSchomacker, Anders
dc.date.accessioned2021-04-18T09:21:27Z
dc.date.available2021-04-18T09:21:27Z
dc.date.issued2021-04-08
dc.description.abstractUnderstanding patterns of colonisation is important for explaining both the distribution of single species and anticipating how ecosystems may respond to global warming. Insular flora may be especially vulnerable because oceans represent severe dispersal barriers. Here we analyse two lake sediment cores from Iceland for ancient sedimentary DNA to infer patterns of colonisation and Holocene vegetation development. Our cores from lakes Torfdalsvatn and Nykurvatn span the last c. 12,000 cal yr BP and c. 8600 cal yr BP, respectively. With near-centennial resolution, we identified a total of 191 plant taxa, with 152 taxa identified in the sedimentary record of Torfdalsvatn and 172 plant taxa in the sedimentary record of Nykurvatn. The terrestrial vegetation at Torfdalsvatn was initially dominated by bryophytes, arctic herbs such as <i>Saxifraga</i> spp. and grasses. Around 10,100 cal yr BP, a massive immigration of new taxa was observed, and shrubs and dwarf shrubs became common whereas aquatic macrophytes became dominant. At Nykurvatn, the dominant taxa were all present in the earliest samples; shrubs and dwarf shrubs were more abundant at this site than at Torfdalsvatn. There was an overall steep increase both in the local accumulated richness and regional species pool until 8000 cal yr BP, by which time ¾ of all taxa identified had arrived. The period 4500-1000 cal yr BP witnessed the appearance of a a small number of bryophytes, graminoids and forbs that were not recorded in earlier samples. The last millennium, after human settlement of the island (Landnám), is characterised by a sudden disappearance of <i>Juniperus communis</i>, but also reappearance of some high arctic forbs and dwarf shrubs. Notable immigration during the Holocene coincides with periods of increased incidence of sea ice, and we hypothesise that this may have acted as a dispersal vector. Thus, although ongoing climate change might provide a suitable habitat in Iceland for a large range of species only found in the neighbouring regions today, the reduction of sea ice may in fact limit the natural colonisation of new plant species.en_US
dc.identifier.citationAlsos, Lammers, Kjellman, Merkel, Bender, Rouillard, Erlendsson, Gudmundsdottir, Benediktsson, Farnsworth, Brynjólfsson, Gísladóttir, Eddudóttir, Schomacker. Ancient sedimentary DNA shows rapid post-glacial colonisation of Iceland followed by relatively stable vegetation until the Norse settlement (Landnám) AD 870. Quaternary Science Reviews. 2021;259en_US
dc.identifier.cristinIDFRIDAID 1903091
dc.identifier.doi10.1016/j.quascirev.2021.106903
dc.identifier.issn0277-3791
dc.identifier.issn1873-457X
dc.identifier.urihttps://hdl.handle.net/10037/20915
dc.language.isoengen_US
dc.publisherElsevieren_US
dc.relation.isbasedonSupplementary data to this article can be found online at <a href=https://doi.org/10.1016/j.quascirev.2021.106903>https://doi.org/10.1016/j.quascirev.2021.106903</a>.en_US
dc.relation.journalQuaternary Science Reviews
dc.relation.projectIDinfo:eu-repo/grantAgreement/EC/H2020/819192/EU/Ice Age Genomic Tracking of Refugia and Postglacial Dispersal/IceAGenT/en_US
dc.rights.accessRightsopenAccessen_US
dc.rights.holderCopyright 2021 The Author(s)en_US
dc.subjectVDP::Mathematics and natural science: 400::Zoology and botany: 480::Vegetation history: 495en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480::Vegetasjonshistorie: 495en_US
dc.subjectVDP::Mathematics and natural science: 400::Geosciences: 450::Sedimentology: 456en_US
dc.subjectVDP::Matematikk og Naturvitenskap: 400::Geofag: 450::Sedimentologi: 456en_US
dc.titleAncient sedimentary DNA shows rapid post-glacial colonisation of Iceland followed by relatively stable vegetation until the Norse settlement (Landnám) AD 870en_US
dc.type.versionpublishedVersionen_US
dc.typeJournal articleen_US
dc.typeTidsskriftartikkelen_US
dc.typePeer revieweden_US


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