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dc.contributor.authorMontoya, Encarnación-
dc.contributor.authorRull, Valentí-
dc.contributor.authorStansell, Nathan D.-
dc.contributor.authorBird, Broxton W.-
dc.contributor.authorNogué, Sandra-
dc.contributor.authorVegas-Vilarrúbia, Teresa-
dc.contributor.authorAbbott, Mark B.-
dc.contributor.authorDíaz, Wilmer A.-
dc.identifier.citationJournal of Quaternary Science 26: 207-218 (2011)-
dc.description.abstractThe occurrence of the Younger Dryas cold reversal in northern South America midlands and lowlands remains controversial. We present a palaeoecological analysis of a Late Glacial lacustrine section from a midland lake (Lake Chonita, 4.6501¿°N, 61.0157¿°W, 884¿m elevation) located in the Venezuelan Gran Sabana, based on physical and biological proxies. The sediments were mostly barren from ~15.3 to 12.7¿k cal a BP, probably due to poor preservation. A ligneous community with no clear modern analogues was dominant from 12.7 to 11.7¿k cal a BP (Younger Dryas chronozone). At present, similar shrublands are situated around 200¿m elevation above the lake, suggesting a cooling-driven downward shift in vegetation during that period. The interval from 11.7 to 10.6¿k cal a BP is marked by a dramatic replacement of the shrubland by savannas and a conspicuous increase in fire incidence. The intensification of local and regional fires at this interval could have played a role in the vegetation shift. A change to wetter, and probably warmer, conditions is deduced after 11.7¿k cal a BP, coinciding with the early Holocene warming. These results support the hypothesis of a mixed origin (climate and fire) of the Gran Sabana savannas, and highlight the climatic instability of the Neotropics during the Late Glacial.-
dc.description.sponsorshipThis work was supported by the Spanish Ministry of Education and Science (now Ministry of Science and Innovation), projects CGL2006-00974 and CGL2009-07069/BOS to V.R. and grant BES-2007-16308 to E.M. Permits to develop the research in Venezuela were provided by the Ministry of Science and Technology (DM/0000013, 5 January 2007), and sampling permits were provided by the Ministry of Environment (no. IE-085, 9 February 2007).-
dc.publisherJohn Wiley & Sons-
dc.subjectLate Glacialen
dc.subjectVegetation changeen
dc.subjectYounger Dryasen
dc.titleVegetation changes in the Neotropical Gran Sabana (Venezuela) around the Younger Dryas Chron-
dc.description.versionPeer Reviewed-
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