Arid
DOI10.1016/j.crte.2009.06.007
Plant migration and plant communities at the time of the "green Sahara"
Watrin, Julie1; Lezine, Anne-Marie1; Hely, Christelle2; Cour, P.; Ballouche, D. Duzer; Elenga, A.; Fredoux, A.; Guinet, P.; Jahns, S.; Kadomura, H.; Maley, J.; Mercuri, A. M.; Pons, I. A.; Reynaud-Farrera, I.; Ritchie, J. C.; Salzmann, U.; Schulz, E.; Tossou, M. G.; Vincens, A.; Waller, M. P.
通讯作者Watrin, Julie
来源期刊COMPTES RENDUS GEOSCIENCE
ISSN1631-0713
出版年2009
卷号341期号:8-9页码:656-670
英文摘要

Around 8500 cal years BP, at the time of the maximum of the African Humid Period, lakes and wetlands expanded in the present-day Sahara while large paleodrainages were formed or re-actived, in response to an orbitally-induced increase in monsoon rainfall. It has been suggested that the direct consequence of this increase in rainfall was the northward displacement of the Sahara/Sahel boundary, thought to have reached 23 degrees N in central and eastern Africa. Here, we show a more complex situation characterized by an increase in biodiversity as the desert accommodated more humid-adapted species from tropical forests and wooded grasslands: tropical plant species now found some 400 to 500 km to the south probably entered the desert as gallery-forest formations along rivers and lakes where they benefited from permanent fresh water. At the same time, Saharan trees and shrubs persisted, giving rise to a vegetation that has no analogue today. In this article, we present distribution maps of selected plant species to show both the amplitude of the vegetation change compared to the present and the composition of the past plant communities. We also estimate the migration rate of tropical plant taxa. to their northernmost position in the Sahara. This study is based on the use of several data sets: a data set of the modern plant distribution in northern Africa and a data set of modem and fossil pollen sites (from the African Pollen Database, http://fpd.mediasfrance.org/ and http://medias.obs-mip.fr/apd/). To cite this article: J. Watrin et al., C R. Geoscience 341 (2009). (C) 2009 Published by Elsevier Masson SAS on behalf of Academie des sciences.


英文关键词West Africa Fossil pollen Biodiversity Migration rates Holocene Green Sahara
类型Article
语种英语
国家France
收录类别SCI-E
WOS记录号WOS:000271777700009
WOS关键词LATE-QUATERNARY VEGETATION ; MODELING INTERCOMPARISON PROJECT ; HOLOCENE VEGETATION ; EQUATORIAL AFRICA ; EASTERN SAHARA ; NE-NIGERIA ; NORTHEAST NIGERIA ; CLIMATIC CHANGES ; MONSOON CHANGES ; POLLEN EVIDENCE
WOS类目Geosciences, Multidisciplinary
WOS研究方向Geology
来源机构French National Research Institute for Sustainable Development
资源类型期刊论文
条目标识符http://119.78.100.177/qdio/handle/2XILL650/160220
作者单位1.CEA, UMR 1752, CNRS, Lab Sci Climat & Environm, F-91191 Gif Sur Yvette, France;
2.Univ Aix Marseille, CNRS, CDF,IRD, Ctr Europeen Rech & Enseignement Geosci Environm, F-13545 Aix En Provence 04, France
推荐引用方式
GB/T 7714
Watrin, Julie,Lezine, Anne-Marie,Hely, Christelle,et al. Plant migration and plant communities at the time of the "green Sahara"[J]. French National Research Institute for Sustainable Development,2009,341(8-9):656-670.
APA Watrin, Julie.,Lezine, Anne-Marie.,Hely, Christelle.,Cour, P..,Ballouche, D. Duzer.,...&Waller, M. P..(2009).Plant migration and plant communities at the time of the "green Sahara".COMPTES RENDUS GEOSCIENCE,341(8-9),656-670.
MLA Watrin, Julie,et al."Plant migration and plant communities at the time of the "green Sahara"".COMPTES RENDUS GEOSCIENCE 341.8-9(2009):656-670.
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