Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers

The Guayana Highlands (GH) are natural laboratories to study the influence of environmental drivers on neotropical ecosystems. The GH summits have been characterized by constant vegetation patterns during the Holocene, except for a few sites close to altitudinal ecotones. Here, we report a new polle...

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Detalles Bibliográficos
Autores: Rull, Valentí, Montoya, Encarnación
Tipo de recurso: artículo
Fecha de publicación:2017
País:España
Institución:Consejo Superior de Investigaciones Científicas (CSIC)
Repositorio:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/147959
Acceso en línea:http://hdl.handle.net/10261/147959
Access Level:acceso abierto
Palabra clave:Holocene
Neotropics
Paleoclimate
Paleoecology
Palynology
Vegetation history
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spelling Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental driversRull, ValentíMontoya, EncarnaciónHoloceneNeotropicsPaleoclimatePaleoecologyPalynologyVegetation historyThe Guayana Highlands (GH) are natural laboratories to study the influence of environmental drivers on neotropical ecosystems. The GH summits have been characterized by constant vegetation patterns during the Holocene, except for a few sites close to altitudinal ecotones. Here, we report a new pollen record showing two significant vegetation shifts, from Myrica forests to tepuian meadows (5340 cal yr BP) and then to Chimantaea shrublands (2720 cal yr BP). These changes are analyzed in terms of potential forcing factors such as regional climate changes, fire and autogenic succession. The first shift occurred shortly after the Holocene Thermal Maximum and the onset of a cooling/drying trend. A charcoal peak was coeval with this change suggesting some potential influence of fire. Autogenic processes related to lake infilling might have also been involved. The second vegetation shift took place during a phase of increased precipitation variability due to an ENSO intensification. The establishment of Chimantaea shrublands started at the end of this phase coinciding with another charcoal peak (2300 cal yr BP). These results support the idea of relevant ecological changes in the GH during the Holocene, the apparent vegetation constancy recorded in other GH summits could be due to site insensitivity. © 2017 Elsevier B.V.This research was funded by the Spanish Ministry of Science and Innovation (projects CGL2006-00974/BOS and CGL2009-07069/BOS) and the Banco de Vizcaya Argentaria Foundation (project BIOCON 2004-90/05).Peer reviewedElsevierMinisterio de Ciencia e Innovación (España)Fundación BBVAConsejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]201720172017info:eu-repo/semantics/articlehttp://purl.org/coar/resource_type/c_6501http://hdl.handle.net/10261/147959reponame:DIGITAL.CSIC. Repositorio Institucional del CSICinstname:Consejo Superior de Investigaciones Científicas (CSIC)Ingléshttp://dx.doi.org/10.1016/j.revpalbo.2017.02.007Síinfo:eu-repo/semantics/openAccessoai:digital.csic.es:10261/1479592026-05-22T06:33:51Z
dc.title.none.fl_str_mv Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
title Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
spellingShingle Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
Rull, Valentí
Holocene
Neotropics
Paleoclimate
Paleoecology
Palynology
Vegetation history
title_short Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
title_full Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
title_fullStr Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
title_full_unstemmed Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
title_sort Holocene vegetation dynamics on the Apakará summit of the neotropical Guayana Highlands and potential environmental drivers
dc.creator.none.fl_str_mv Rull, Valentí
Montoya, Encarnación
author Rull, Valentí
author_facet Rull, Valentí
Montoya, Encarnación
author_role author
author2 Montoya, Encarnación
author2_role author
dc.contributor.none.fl_str_mv Ministerio de Ciencia e Innovación (España)
Fundación BBVA
Consejo Superior de Investigaciones Científicas [https://ror.org/02gfc7t72]
dc.subject.none.fl_str_mv Holocene
Neotropics
Paleoclimate
Paleoecology
Palynology
Vegetation history
topic Holocene
Neotropics
Paleoclimate
Paleoecology
Palynology
Vegetation history
description The Guayana Highlands (GH) are natural laboratories to study the influence of environmental drivers on neotropical ecosystems. The GH summits have been characterized by constant vegetation patterns during the Holocene, except for a few sites close to altitudinal ecotones. Here, we report a new pollen record showing two significant vegetation shifts, from Myrica forests to tepuian meadows (5340 cal yr BP) and then to Chimantaea shrublands (2720 cal yr BP). These changes are analyzed in terms of potential forcing factors such as regional climate changes, fire and autogenic succession. The first shift occurred shortly after the Holocene Thermal Maximum and the onset of a cooling/drying trend. A charcoal peak was coeval with this change suggesting some potential influence of fire. Autogenic processes related to lake infilling might have also been involved. The second vegetation shift took place during a phase of increased precipitation variability due to an ENSO intensification. The establishment of Chimantaea shrublands started at the end of this phase coinciding with another charcoal peak (2300 cal yr BP). These results support the idea of relevant ecological changes in the GH during the Holocene, the apparent vegetation constancy recorded in other GH summits could be due to site insensitivity. © 2017 Elsevier B.V.
publishDate 2017
dc.date.none.fl_str_mv 2017
2017
2017
dc.type.none.fl_str_mv info:eu-repo/semantics/article
http://purl.org/coar/resource_type/c_6501
format article
dc.identifier.none.fl_str_mv http://hdl.handle.net/10261/147959
url http://hdl.handle.net/10261/147959
dc.language.none.fl_str_mv Inglés
language_invalid_str_mv Inglés
dc.relation.none.fl_str_mv http://dx.doi.org/10.1016/j.revpalbo.2017.02.007
Sí
dc.rights.none.fl_str_mv info:eu-repo/semantics/openAccess
eu_rights_str_mv openAccess
dc.publisher.none.fl_str_mv Elsevier
publisher.none.fl_str_mv Elsevier
dc.source.none.fl_str_mv reponame:DIGITAL.CSIC. Repositorio Institucional del CSIC
instname:Consejo Superior de Investigaciones Científicas (CSIC)
instname_str Consejo Superior de Investigaciones Científicas (CSIC)
reponame_str DIGITAL.CSIC. Repositorio Institucional del CSIC
collection DIGITAL.CSIC. Repositorio Institucional del CSIC
repository.name.fl_str_mv
repository.mail.fl_str_mv
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