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Climatic controls on Later Stone Age human adaptation in Africa's southern Cape

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journal contribution
posted on 17.01.2018, 14:07 by Brian M. Chase, J. Tyler Faith, Alex Mackay, Manuel Chevalier, Andrew S. Carr, Arnoud Boom, Sophak Lim, Paula J. Reimer
Africa's southern Cape is a key region for the evolution of our species, with early symbolic systems, marine faunal exploitation, and episodic production of microlithic stone tools taken as evidence for the appearance of distinctively complex human behavior. However, the temporally discontinuous nature of this evidence precludes ready assumptions of intrinsic adaptive benefit, and has encouraged diverse explanations for the occurrence of these behaviors, in terms of regional demographic, social and ecological conditions. Here, we present a new high-resolution multi-proxy record of environmental change that indicates that faunal exploitation patterns and lithic technologies track climatic variation across the last 22,300 years in the southern Cape. Conditions during the Last Glacial Maximum and deglaciation were humid, and zooarchaeological data indicate high foraging returns. By contrast, the Holocene is characterized by much drier conditions and a degraded resource base. Critically, we demonstrate that systems for technological delivery – or provisioning – were responsive to changing humidity and environmental productivity. However, in contrast to prevailing models, bladelet-rich microlithic technologies were deployed under conditions of high foraging returns and abandoned in response to increased aridity and less productive subsistence environments. This suggests that posited links between microlithic technologies and subsistence risk are not universal, and the behavioral sophistication of human populations is reflected in their adaptive flexibility rather than in the use of specific technological systems.

Funding

Funding was received from the European Research Council (ERC) under the European Union's Seventh Framework Programme (FP7/2007–2013)/ERC Starting Grant “HYRAX”, grant agreement no. 258657, and the International Union for Quaternary Research (INQUA), project no. 1205P. We would like to thank Matthew Britton and Ian Newton for assistance in collecting and analysing the material.

History

Citation

Journal of Human Evolution, 2018, 114, pp. 35-44

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/School of Geography, Geology and the Environment/Physical Geography

Version

AM (Accepted Manuscript)

Published in

Journal of Human Evolution

Publisher

Elsevier for Academic Press

issn

0047-2484

eissn

1095-8606

Acceptance date

13/09/2017

Copyright date

2017

Available date

21/10/2018

Publisher version

http://www.sciencedirect.com/science/article/pii/S0047248416301634?via=ihub

Notes

The file associated with this record is under embargo until 12 months after publication, in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en