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Landscape changes in the southern Amazonian foreland basin during the Holocene inferred from Lake Ginebra, Beni, Bolivia

Published online by Cambridge University Press:  26 December 2019

Katerine Escobar-Torrez Open the ORCID record for Katerine Escobar-Torrez [Opens in a new window] ,
Marie-Pierre Ledru ,
Teresa Ortuño ,
Umberto Lombardo  and
Jean-François Renno
Katerine Escobar-Torrez*
Affiliation:
Universidad Mayor de San Andrés, Bolivia Herbario Nacional de Bolivia (LPB), 10077La Paz, Bolivia
Marie-Pierre Ledru
Affiliation:
ISEM, Université de Montpellier, CNRS, EPHE, IRD, 34095Montpellier, France
Teresa Ortuño
Affiliation:
Herbario Nacional de Bolivia (LPB), 10077La Paz, Bolivia
Umberto Lombardo
Affiliation:
Institute of Geography, University of Bern, 3012Bern, Switzerland
Jean-François Renno
Affiliation:
Laboratoire Mixte International - Evolution et Domestication de l’Ichtyofaune Amazonienne (LMI-EDIA), UMR DIADE (IRD, Université de Montpellier), Centre IRD, F-34394Montpellier Cedex 5, France
*
*Corresponding author e-mail address: [email protected] (K.E.-T.).
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Abstract

Our study is located in northern Beni and aims to improve knowledge on regional landscape changes from the last 8600 years, based on pollen and charcoal analyses from a lacustrine sediment core from Lake Ginebra. Our results showed that gallery forest and lacustrine sediment were observed from 8645 until 3360 cal yr BP. After a change from a lacustrine to a swamp environment at 1700 cal yr BP, the Cerrados and the Mauritia swamp became installed 1000 years ago on our study site. The environmental changes we observed over the last 8600 years in the Ginebra record reinforce the evidence of a west–east climatic gradient with the persistence of rain forest throughout the Holocene on the western side and the presence of the Cerrados until the late Holocene on the eastern side. Moreover, the persistence of a wet forest in the early to mid-Holocene in southwestern Amazonia highlighted some local responses to the global trend that could be related to the distance from the Andes; while in the late Holocene, both an increase in insolation and strengthening of the South American summer monsoon system enabled the installation of a seasonal flooded savanna in northern Beni and of the rain forest in eastern Beni.

Keywords

CharcoalPollenFloodingMid-HoloceneRain forestCerrado ecotone
Type
Research Article
Information
Quaternary Research , Volume 94 , March 2020 , pp. 46 - 60
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2019

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