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Please use this identifier to cite or link to this item: http://hdl.handle.net/1843/43901
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dc.creatorDaniel Meira Arrudapt_BR
dc.creatorCarlos Ernesto Gonçalves Reynaud Schaeferpt_BR
dc.creatorRúbia Santos Fonsecapt_BR
dc.creatorRicardo Ribeiro de Castro Solarpt_BR
dc.creatorElpidio Inácio Fernandes Filhopt_BR
dc.date.accessioned2022-08-03T12:03:57Z-
dc.date.available2022-08-03T12:03:57Z-
dc.date.issued2017-10-12-
dc.citation.volume27pt_BR
dc.citation.issue1pt_BR
dc.citation.spage47pt_BR
dc.citation.epage56pt_BR
dc.identifier.doihttps://doi.org/10.1111/geb.12646pt_BR
dc.identifier.issn1466-8238pt_BR
dc.identifier.urihttp://hdl.handle.net/1843/43901-
dc.description.resumoAim: The two main hypotheses about the Neotropical palaeovegetation, namely that of Amazonian refugia by Haffer and of the Pleistocene arc by Prado and Gibbs, are still constantly debated. We offer new insights on this debate using ecological niche modelling with combined climate–soil predictors to test both hypotheses, reconstruct the palaeovegetation of the Last Glacial Maximum (LGM; 21 ka) and Mid-Holocene (Mid-H; 6 ka) and indicate the configuration of refugia areas. Location: Brazil. Time period: Last 21 ka. Major taxa studied: Biomes. Methods: We modelled the environmental space of the 10 most representative biomes with the RandomForest classifier, using climate predictors from three atmospheric general circulation models (CCSM4, MPI-ESM-P and MIROC-ESM) and soil predictors, the same for the different situations. Based on the consensus among the models, we reconstructed the palaeovegetation cover for LGM and Mid-H and used fossil pollen sites to validate the reconstructions in a direct comparison. Results: The climate in the past was cooler and wetter throughout most of the territory. The Amazon basin region was the most affected by climate change in the last 21 ka, with equatorial rain forest retracting to refugia areas, while the tropical rain forest (with climatic preferences similar to the Atlantic forest) expanded in the basin. In southern Brazil, the mixed forest (Araucaria forest) shifted to lower latitudes, while the grasslands expanded. In most biomes, the greatest changes occurred in the ecotonal zones, supported by pollen fossils. Main conclusions: With regard to Haffer's hypothesis, the forests of the Amazonian lowlands retreated to refugia areas, while the colder and wetter climate of the basin created a favourable niche for another type of forest, instead of savanna. The advance of dry vegetation was restricted to ecotonal conditions, preventing the formation of a continuous Pleistocene arc, predicted by Prado and Gibbs's hypothesis.pt_BR
dc.description.sponsorshipCAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superiorpt_BR
dc.languageengpt_BR
dc.publisherUniversidade Federal de Minas Geraispt_BR
dc.publisher.countryBrasilpt_BR
dc.publisher.departmentICA - INSTITUTO DE CIÊNCIAS AGRÁRIASpt_BR
dc.publisher.initialsUFMGpt_BR
dc.relation.ispartofGlobal Ecology and Biogeographypt_BR
dc.rightsAcesso Abertopt_BR
dc.subject.otherFlorestas tropicaispt_BR
dc.subject.otherBiogeografiapt_BR
dc.subject.otherMudanças climáticaspt_BR
dc.subject.otherNicho (Ecologia)pt_BR
dc.subject.otherPaleoecologiapt_BR
dc.titleVegetation cover of Brazil in the last 21 ka New insights into the Amazonian refugia and Pleistocenic arc hypothesespt_BR
dc.typeArtigo de Periódicopt_BR
dc.url.externahttps://onlinelibrary.wiley.com/doi/full/10.1111/geb.12646pt_BR
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