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Science 28 November 2008:
Vol. 322. no. 5906, p. 1326
DOI: 10.1126/science.1163483
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Technical Comments

Response to Comment on "Climate-Driven Ecosystem Succession in the Sahara: The Past 6000 Years"

S. Kröpelin,1* D. Verschuren,2 A.-M. Lézine3

The Lake Yoa record and archaeological data provide adequate evidence that mid-Holocene aridification did not occur abruptly across all of North Africa. Modeling results on the issue of abrupt versus gradual desiccation of the Sahara are sufficiently diverse that paleoecological data from a continuous natural archive can usefully guide the evaluation of model parameters responsible for this diversity.

1 Africa Research Unit, Institute of Prehistoric Archaeology, University of Cologne, Jennerstraße 8, D-50823 Köln, Germany.
2 Limnology Unit, Department of Biology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Ghent, Belgium.
3 Laboratoire des Sciences du Climat et de l'Environnement, Unité mixte de recherche 1572, CNRS-CEA-UVSQ, L'Orme des Merisiers, F-91191 Gif-Sur-Yvette, France.

* To whom correspondence should be addressed. E-mail: s.kroe{at}uni-koeln.de

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Science. ISSN 0036-8075 (print), 1095-9203 (online)