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dc.contributor.authorRull, Valentí-
dc.contributor.authorMontoya, Encarnación-
dc.date.accessioned2014-10-29T08:45:51Z-
dc.date.available2014-10-29T08:45:51Z-
dc.date.issued2014-
dc.identifier.citationQuaternary Science Reviews 99 :17-33 (2014)es_ES
dc.identifier.urihttp://hdl.handle.net/10261/103944-
dc.description17 p., fot., mapas, gráf. -- Post-print del artículo publicado en Quaternary Science Review 99 :17-33 (2014). Versión revisada y corregida.es_ES
dc.description.abstractMauritia flexuosa L.f. is one of the more widely distributed neotropical palms and is intensively used by humans. This palm can grow in tropical rainforests or can develop a particular type of virtually monospecific communities restricted to warm and wet lowlands of the Orinoco and Amazon basins. It has been proposed that, during the Last Glacial Maximum (LGM), the Mauritia swamp communities were restricted to the core of the Amazon basin from where they expanded favoured by the Holocene warmer and wetter climates. It has also been suggested that some of these palm communities might have been the result of human dispersal during the last millennia. Here, we evaluate both hypotheses using the case study of the Venezuelan Gran Sabana (GS) region, where the M. flexuosa swamp communities (locally called morichales) are common and well developed. The morichales did not reach the GS until the last 2000 years, as manifested by sudden increases of Mauritia pollen parallelled by similar trends in charcoal particles as proxies for fire. During the last two millennia, the situation was very similar to the present, characterised by extensive burning practices affecting savannas and savanna–forest ecotones but rarely morichales (selective burning). This strongly suggests that human activities could have been responsible for the penetration of the morichales to the GS. A meta-analysis of the available records of Mauritia pollen across northern South America shows that this palm has been present in the region since at least the last four glacial cycles. During the LGM, Mauritia was likely restricted to few but widespread sites of favourable microclimatic conditions (microrefugia) from where the palm expanded during the Holocene. During the last 2000 years, Mauritia underwent a remarkable expansion in northern South America, which includes the GS. It is proposed that humans could have played a role in this regional expansion of Mauritia communities.es_ES
dc.description.sponsorshipThis work was developed under the auspices of project ECOPAST, funded by the Ministry of Science and Innovation of Spain (grant CGL2009-07069/BOS to V. Rull), and a CSIC (Spanish National Research Council) postdoctoral contract to E. Montoya.es_ES
dc.language.isoenges_ES
dc.publisherElsevieres_ES
dc.relation.isversionofPostprintes_ES
dc.rightsopenAccesses_ES
dc.subjectMauritiaes_ES
dc.subjectPalm swampses_ES
dc.subjectNeotropicses_ES
dc.subjectHuman disturbancees_ES
dc.subjectPalaeoecologyes_ES
dc.subjectLast millenniaes_ES
dc.titleMauritia flexuosa palm swamp communities: natural or human-made? A palynological study of the Gran Sabana region (northern South America) within a neotropical contextes_ES
dc.typeartículoes_ES
dc.identifier.doihttp://dx.doi.org/10.1016/j.quascirev.2014.06.007-
dc.description.peerreviewedPeer reviewedes_ES
dc.relation.publisherversionhttp://dx.doi.org/10.1016/j.quascirev.2014.06.007es_ES
dc.identifier.e-issn0277-3791-
dc.rights.licensehttp://www.elsevier.com/about/open-access/green-open-accesses_ES
dc.relation.csices_ES
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