Science Keywords>LAND SURFACE
European Diatom Database-East African DatasetEntry ID: uk_nc_eddi_africae
Abstract: The European Diatom Database (EDDI) is a web-based information system designed
to enhance the application of diatom analysis to problems of surface water
acidification, eutrophication and climate change.
The East African training set includes samples from 98 sites situated between
19N and 14S in latitude, 27N and 43E in longitude. They range from afro-alpine
bogs at altitude of up to 4000 m to ... hypersaline lakes lying below sea-level.
The conductivity ranges from 40 to 50,000 S cm-1 and the pH from 5 to 10.9. The
chemical facies is of the alkaline earths/bicarbonate type for freshwaters, to
the Na/carbonate or Na/chloride type for highly concentrated waters. The
training set consists of 187 samples. Most samples have been collected by F.
Gasse (98) from 1970, P. Kilham (19), J.-F. Talling (14) and R.B. Wood (14).
Other collaborators in collecting diatom samples have been C. Barton, R.M.
Baxter, J. Green, J. Kalff, ad J. L. Richardson. All diatom samples were
counted by F. Gasse. Detailed descriptions of the diatom samples and chemical
analyses were published by Gasse et al. (1983). This paper also provides a
numerical classification of the diatom assemblages. A total of 579 taxa was
identified in the data set, the taxonomy and ecology of which are discussed and
illustrated by Gasse (1986a). This data set was used to develop transfer
functions for estimating pH (Gasse and Tekaia, 1983) and conductivity (Gasse
and Tekaia, unpublished) and the model has subsequently been applied to diatom
sequences to reconstruct lake pH and salinity histories and related changes in
the water balance (e.g. Gasse, 1986b ; Barker, 1990 ; Barker et al., 1991).
Data Set Citation
Dataset Originator/Creator: Francoise Gasse
Dataset Title: European Diatom Database-East African Dataset
Dataset Release Place: Newcastle upon Tyne, United Kingdom
Dataset Publisher: The University of NewcastleOnline Resource: http://craticula.ncl.ac.uk/Eddi/jsp/datasetdesc.jsp?DatasetId=AfricaE
This data set description is a member of a collection. The collection is described in
Start Date: 1960-01-01Stop Date: 1986-12-31
TERRESTRIAL HYDROSPHERE > SURFACE WATER > LAKES > LAKEWATER CHEMICAL DATA
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > ALKALINITY
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CONDUCTIVITY
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > NITROGEN COMPOUNDS
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > PH > LAKEWATER PH TRANSFER FUNCTION
TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > TRACE METALS
LAND SURFACE > EROSION/SEDIMENTATION > SEDIMENT CHEMISTRY > SURFACE SEDIMENT SAMPLES
LAND SURFACE > EROSION/SEDIMENTATION > SEDIMENTS > SURFACE SEDIMENT SAMPLES
BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS
BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS
BIOSPHERE > AQUATIC ECOSYSTEMS > LAKES
Access Constraints None
Use Constraints None
Data Set Progress
Role: TECHNICAL CONTACT
Phone: 33 4 42 97 15 70
Fax: 33 4 42 97 15 95
Email: gasse at cerege.fr
CNRS-CEREGE, Europole Mediterraneen de l'Arbois- BP80
City: Aix en Provence Cedex 04
Postal Code: 13545
Role: DIF AUTHOR
Phone: (301) 614-6898
Email: Tyler.B.Stevens at nasa.gov
NASA Goddard Space Flight Center Global Change Master Directory
Province or State: MD
Postal Code: 20771
Barker, P.A., 1990. Diatoms as palaeolimnological indicators : A reconstruction
of late Quaternary environments in two East African salt lakes. Thesis.
Loughbourough Univ., 267 pp.
Barker, P., Gasse, F., Roberts, N., et Taieb, M., 1991. Taphonomy and
diagenesis in diatom assemblages: a Late Pleistocene palaeoecological study
from Lake Magadi, Kenya. In E. Smith ... (Ed), Environmental History and
Paleolimnology, Kluwer Ac. Press., Dordrecht.
Gasse, F., Talling, J.F. & Kilham, P., 1983. Diatom assemblages in East Africa:
classification, distribution and ecology. Rev. Hydrobiol. Trop. ,16, 1, 3-34.
Gasse, F. & Tekaia, F., 1983. Transfer functions for estimating paleocological
conditions (ph) from East African diatoms. Hydrobiologia, 103, 85-90.
Gasse, F., 1986b. East African diatoms and water pH. In: Smol et al. Eds.,
Diatoms and Lake Acidity. Developments in Hydrobiology, 29, 149-168. Junk
Gasse, F., 1986a. East African Diatoms. Taxonomy, ecological distribution.
Bibliotheca Diatomologica. Bd 11, 202 pp. .J. Cramer, Stuttgart.
Extended Metadata Properties
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Creation and Review Dates
DIF Creation Date: 2002-09-23
Last DIF Revision Date: 2012-12-21
Future DIF Review Date: 2003-09-23