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The collapse of megafaunal populations in southeastern Brazil

Published online by Cambridge University Press:  17 August 2017

Marco F. Raczka ,
Mark B. Bush  and
Paulo Eduardo De Oliveira
Marco F. Raczka*
Affiliation:
Department of Biological Sciences, Florida Institute of Technology, Melbourne, Florida 32901, USA
Mark B. Bush
Affiliation:
Department of Biological Sciences, Florida Institute of Technology, Melbourne, Florida 32901, USA
Paulo Eduardo De Oliveira
Affiliation:
Department of Sedimentary and Environmental Geology, Institute of Geosciences, University of São Paulo, São Paulo 05508-080, Brazil Department of Botany, The Field Museum of Natural History, Chicago, Illinois 60605, USA
*
*Corresponding author at: Department of Biological Sciences, Florida Institute of Technology, Melbourne, Florida 32901, USA. E-mail address: mraczka2009@my.fit.edu (M.F. Raczka).
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Abstract

Whether humans or climate change caused the extinction of megafaunal populations is actively debated. Caves in the Lagoa Santa provide mixed assemblages of megafauna and human remains; however, it remains uncertain the extent to which humans and megafauna interacted or overlapped temporally. Here we present the first paleoecological record from lowland South America that tracks the decline of megafauna and its ecological implications. We provide a data set for pollen, charcoal, and Sporormiella, from two lakes in southeastern Brazil that span the last 23,000 yr. The data showed reduced abundances of Sporormiella and an inferred megafaunal population decline that began 18,000 yr ago, with the functional extinction occurring between 12,000 and 11,500 yr ago. Population declines coincided with wet events. The age of the final megafaunal decline is within the range of the first human occupation of the region. Our data are consistent with climate causing the population collapse, with humans preventing population recovery and inducing extinction. We did not observe some of the ecological repercussions documented at other sites and attributed to the megafaunal extinction. Habitat-specific ecological consequences of the extinction add to the heterogeneity of late Pleistocene and early Holocene landscapes.

Keywords

CharcoalClimate changeHumanMegafaunaPleistocenePollenSporormiella
Type
Tribute to Daniel Livingstone and Paul Colinvaux
Information
Quaternary Research , Volume 89 , Issue 1: Tribute to Daniel Livingstone and Paul Colinvaux , January 2018 , pp. 103 - 118
Copyright
Copyright © University of Washington. Published by Cambridge University Press, 2017 

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