NDLI: Environmental change in Northern Egyptian Delta lakes during the late Holocene, based on diatom analysis

Content Provider	Springer Nature Link
Author	Zalat, Abdelfattah Vildary, Simone Servant
Copyright Year	2006
Abstract	Quantitative and qualitative diatom analyses from the north Nile Delta lakes sediments of Egypt were used to evaluate the paleoenvironmental development of the lakes and climatic changes during the late Holocene. We analyzed 565 samples taken from 19 cores from Manzala, Burullus and Edku lakes. A total of 263 diatom species and varieties were identified. Multivariate statistical analyses distinguished 17 ecological groups that reflect changes in water salinity, lake-level and trophic state of the lakes, which in turn are mainly related to climatic changes and anthropogenic impacts. Manzala and Burullus lakes experienced a series of alternation between fresh, brackish and marine episodes, which were associated with wet and dry climates. Edku Lake cores, however, contained only three ecological groups that are characteristic of brackish water conditions. The general depositional regime in the lakes indicated five environmental phases: (a) a deep freshwater phase when the Nile flood water reach the lakes during humid warm climate; (b) a shallow freshwater phase with some macrophytes during a dry climate; (c) a shallow brackish water phase when Nile floodwater ceased during a dry climate and the lakes shifted to brackish conditions; (d) a mixed environmental phase when the seawater mixed with freshwater from drains and canals (water salinity fluctuated widely from freshwater to estuarine and full marine conditions); (e) a fully marine phase when seawater entered the lakes at all stages of the tide.
Starting Page	273
Ending Page	299
Page Count	27
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	37
Issue Number	2
e-ISSN	15730417
Language	English
Publisher	Springer Netherlands
Publisher Date	2006-10-21
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Egyptian lakes Holocene sediments Diatoms Canonical correspondence analysis Geology Freshwater & Marine Ecology Physical Geography Climate Change Sedimentology Environment
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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