A 6900-year history of landscape modification by humans in lowland Amazonia

M. B. Bush, A. Correa-Metrio, C. H. McMichael, S. Sully, C. R. Shadik, B. G. Valencia, T. Guilderson, M. Steinitz-Kannan, Jonathan Overpeck

Research output: Contribution to journalArticle

33 Citations (Scopus)

Abstract

A sedimentary record from the Peruvian Amazon provided evidence of climate and vegetation change for the last 6900 years. Piston cores collected from the center of Lake Sauce, a 20 m deep lake at 600 m elevation, were 19.7 m in length. The fossil pollen record showed a continuously forested catchment within the period of the record, although substantial changes in forest composition were apparent. Fossil charcoal, found throughout the record, was probably associated with humans setting fires. Two fires, at c. 6700 cal BP and 4270 cal BP, appear to have been stand-replacing events possibly associated with megadroughts. The fire event at 4270 cal BP followed a drought that caused lowered lake levels for several centuries. The successional trajectories of forest recovery following these large fires were prolonged by smaller fire events. Fossil pollen of Zea mays (cultivated maize) provided evidence of agricultural activity at the site since c. 6320 cal BP. About 5150 years ago, the lake deepened and started to deposit laminated sediments. Maize agriculture reached a peak of intensity between c. 3380 and 700 cal BP. Fossil diatom data provided a proxy for lake nutrient status and productivity, both of which peaked during the period of maize cultivation. A marked change in land use was evident after c. 700 cal BP when maize agriculture was apparently abandoned at this site. Iriartea, a hyperdominant of riparian settings in western Amazonia, increased in abundance within the last 1100 years, but declined markedly at c. 1070 cal BP and again between c. 80 and -10 cal BP.

Original languageEnglish (US)
Pages (from-to)52-64
Number of pages13
JournalQuaternary Science Reviews
Volume141
DOIs
StatePublished - Jun 1 2016

Fingerprint

Amazonia
lowlands
lakes
fossils
maize
event
fossil
history
agriculture
corn
lake
Iriartea
drought
pollen
evidence
land use
productivity
pistons
forested catchment
forested watersheds

Keywords

  • Agriculture
  • Forest enrichment
  • Fossil charcoal
  • Fossil diatoms
  • Fossil pollen
  • Human disturbance
  • Iriartea
  • Maize
  • Mauritia
  • Pre-Columbian

ASJC Scopus subject areas

  • Geology
  • Global and Planetary Change
  • Ecology, Evolution, Behavior and Systematics
  • Archaeology
  • Archaeology

Cite this

Bush, M. B., Correa-Metrio, A., McMichael, C. H., Sully, S., Shadik, C. R., Valencia, B. G., ... Overpeck, J. (2016). A 6900-year history of landscape modification by humans in lowland Amazonia. Quaternary Science Reviews, 141, 52-64. https://doi.org/10.1016/j.quascirev.2016.03.022

A 6900-year history of landscape modification by humans in lowland Amazonia. / Bush, M. B.; Correa-Metrio, A.; McMichael, C. H.; Sully, S.; Shadik, C. R.; Valencia, B. G.; Guilderson, T.; Steinitz-Kannan, M.; Overpeck, Jonathan.

In: Quaternary Science Reviews, Vol. 141, 01.06.2016, p. 52-64.

Research output: Contribution to journalArticle

Bush, MB, Correa-Metrio, A, McMichael, CH, Sully, S, Shadik, CR, Valencia, BG, Guilderson, T, Steinitz-Kannan, M & Overpeck, J 2016, 'A 6900-year history of landscape modification by humans in lowland Amazonia', Quaternary Science Reviews, vol. 141, pp. 52-64. https://doi.org/10.1016/j.quascirev.2016.03.022
Bush MB, Correa-Metrio A, McMichael CH, Sully S, Shadik CR, Valencia BG et al. A 6900-year history of landscape modification by humans in lowland Amazonia. Quaternary Science Reviews. 2016 Jun 1;141:52-64. https://doi.org/10.1016/j.quascirev.2016.03.022
Bush, M. B. ; Correa-Metrio, A. ; McMichael, C. H. ; Sully, S. ; Shadik, C. R. ; Valencia, B. G. ; Guilderson, T. ; Steinitz-Kannan, M. ; Overpeck, Jonathan. / A 6900-year history of landscape modification by humans in lowland Amazonia. In: Quaternary Science Reviews. 2016 ; Vol. 141. pp. 52-64.
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