Vegetation, climate and fire in the eastern Andes (Bolivia) during the last 18,000 years

Joseph J. Williams*, William D. Gosling, Stephen J. Brooks, Angela L. Coe, Sheng Xu

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

27 Citations (SciVal)

Abstract

A c. 18 ka cal BP long sediment record from Laguna Khomer Kocha Upper (4153 m asl), Bolivia, shows that fire regime, governed by climatic variation, has long been a transformative agent in the eastern Andes. Before c. 14.5 ka cal BP, warming and relatively moist conditions free from fire, facilitated the expansion of high Andean Polylepis woodland. Fire onset at c. 14.5.ka cal BP, quickly transformed the local vegetation and the woodlands became restricted to areas protected from fire. A major increase in burning, c. 10.1-6.4 ka cal BP removed Polylepis woodland locally and this coincided with a region-wide Holocene dry event (HOE) which caused falling lake levels and allowed fire intensification. A decline in burning at c. 6.4 ka cal BP and an increase in marsh-woodland (Alnus) marked the termination of the HDE and a return to wetter conditions. As well as recording the environmental history of local vegetation dynamics, long-distance pollen transport provides evidence of changes in the Yungas montane forests, highlighting their sensitivity to climate and burning regimes. Simultaneous adjustments in both Andean and Yungas montane taxa suggest that vegetation dynamics in the two environments are linked to a common climatic driver. There is no evidence to indicate that human activity had any impact on the local landscape. (C) 2011 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)115-126
Number of pages12
JournalPalaeogeography, Palaeoclimatology, Palaeoecology
Volume312
Issue number1-2
Early online date12 Oct 2011
DOIs
Publication statusPublished - 01 Dec 2011

Keywords

  • HISTORY
  • HOLOCENE RECORD
  • Polylepis woodland
  • GLACIAL MAXIMUM
  • ENVIRONMENTAL-CHANGE
  • Fossil charcoal
  • Deglaciation
  • Temperature
  • Precipitation
  • BIODIVERSITY HOTSPOTS
  • Holocene dry event (HDE)
  • PERUVIAN ANDES
  • LAKE TITICACA
  • SPORORMIELLA
  • Fossil pollen
  • SOUTH-AMERICA
  • CLOUD FOREST

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