Lacustrine records of Holocene flood pulse dynamics in the Upper Paraguay River watershed (Pantanal wetlands, Brazil)

Michael M. McGlue, Aguinaldo Silva, Hiran Zani, Fabrício A. Corradini, Mauro Parolin, Erin J. Abel, Andrew S. Cohen, Mario L. Assine, Geoffrey S. Ellis, Mark A. Trees, Sidney Kuerten, Frederico dos Santos Gradella, Giliane Gessica Rasbold

Research output: Contribution to journalArticle

48 Scopus citations

Abstract

The Pantanal is the world's largest tropical wetland and a biodiversity hotspot, yet its response to Quaternary environmental change is unclear. To address this problem, sediment cores from shallow lakes connected to the Upper Paraguay River (PR) were analyzed and radiocarbon dated to track changes in sedimentary environments. Stratal relations, detrital particle size, multiple biogeochemical indicators, and sponge spicules suggest fluctuating lake-level lowstand conditions between ~11,000 and 5300. cal. yr BP, punctuated by sporadic and in some cases erosive flood flows. A hiatus has been recorded from ~5300 to 2600. cal. yr BP, spurred by confinement of the PR within its channel during an episode of profound regional drought. Sustained PR flooding caused a transgression after ~2600. cal. yr BP, with lake-level highstand conditions appearing during the Little Ice Age. Holocene PR flood pulse dynamics are best explained by variability in effective precipitation, likely driven by insolation and tropical sea-surface temperature gradients. Our results provide novel support for hypotheses on: (1) stratigraphic discontinuity of floodplain sedimentary archives; (2) late Holocene methane flux from Southern Hemisphere wetlands; and (3) pre-colonial indigenous ceramics traditions in western Brazil.

Original languageEnglish (US)
Pages (from-to)285-294
Number of pages10
JournalQuaternary Research (United States)
Volume78
Issue number2
DOIs
StatePublished - Sep 1 2012

Keywords

  • Flood pulse
  • Floodplain lakes
  • Paleolimnology
  • Pantanal wetlands
  • Upper Paraguay River

ASJC Scopus subject areas

  • Arts and Humanities (miscellaneous)
  • Earth-Surface Processes
  • Earth and Planetary Sciences(all)

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    McGlue, M. M., Silva, A., Zani, H., Corradini, F. A., Parolin, M., Abel, E. J., Cohen, A. S., Assine, M. L., Ellis, G. S., Trees, M. A., Kuerten, S., Gradella, F. D. S., & Rasbold, G. G. (2012). Lacustrine records of Holocene flood pulse dynamics in the Upper Paraguay River watershed (Pantanal wetlands, Brazil). Quaternary Research (United States), 78(2), 285-294. https://doi.org/10.1016/j.yqres.2012.05.015