From Megachad to Microchad - environmental changes during the Holocene

  • The investigations carried out within the project in NE-Nigeria since 1989 have been focussing on the late Pleistocene and Holocene landscape development of the south eastern Chad basin. Areas of interest include palaeodune fields, clay plains and former beach ridge systems of Lake Chad. Transgressions and regressions of Lake Chad played an important role in the younger landscape history of NE-Nigeria and have also caused great environmental changes. The term „Megachad“ is well known and describes an enormous lake with an extension comparable with the Caspian Sea of today. The term „Microchad“ stands for the other recent extreme in terms of the lake dimensions varying during the times. Environmental changes in the surroundings of Lake Chad are closely connected with transgressions and regressions of the lake. These lake level changes can be climatically induced as well as non-climatically, due to human impact. Nearly all land units have more or less been influenced by the lake, spatially as well as temporally. It is important, though, to notice the scales of the changes. Some changes took place in a millennial scale, some in the scales of centuries or decades, and at least – as can be observed every year – in a seasonal scale.

Download full text files

Export metadata

Additional Services

Share in Twitter Search Google Scholar
Author:Heinrich ThiemeyerGND
Parent Title (German):Berichte des Sonderforschungsbereichs 268
Series (Serial Number):Berichte des Sonderforschungsbereichs 268 (14, 011)
Publisher:SFB 268
Place of publication:Frankfurt, M.
Document Type:Article
Date of Publication (online):2006/12/20
Year of first Publication:2000
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2006/12/20
Page Number:8
First Page:11
Last Page:18
Institutes:Zentrale Einrichtung / SFB 268
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
Sammlungen:Sammlung Biologie / Sondersammelgebiets-Volltexte
Licence (German):License LogoDeutsches Urheberrecht