European Diatom Database-East African Dataset
Entry ID: uk_nc_eddi_africae

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Summary
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and Tekaia, unpublished) and the model has subsequently been applied to diatom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).

Parent DIF
This data set description is a member of a collection. The collection is described in
uk_nc_eddi


Geographic Coverage
 N: 13.32 S: -9.5  E: 41.7  W: 2.32

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 Newcastle
Online Resource: http://craticula.ncl.ac.uk/Eddi/jsp/datasetdesc.jsp?DatasetId=AfricaE


Temporal Coverage
Start Date: 1960-01-01
Stop Date: 1986-12-31


Location Keywords
CONTINENT > AFRICA > EASTERN AFRICA > ETHIOPIA
CONTINENT > AFRICA > EASTERN AFRICA > MALAWI
CONTINENT > AFRICA > WESTERN AFRICA > NIGER
CONTINENT > AFRICA > EASTERN AFRICA > TANZANIA
CONTINENT > AFRICA > EASTERN AFRICA > UGANDA
CONTINENT > AFRICA > EASTERN AFRICA


Science Keywords
TERRESTRIAL HYDROSPHERE >SURFACE WATER >LAKES >LAKEWATER CHEMICAL DATA    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >ALKALINITY    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >CONDUCTIVITY    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >NITROGEN COMPOUNDS    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >PH >LAKEWATER PH TRANSFER FUNCTION    [Definition]
TERRESTRIAL HYDROSPHERE >WATER QUALITY/WATER CHEMISTRY >TRACE METALS    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >SEDIMENT CHEMISTRY >SURFACE SEDIMENT SAMPLES    [Definition]
LAND SURFACE >EROSION/SEDIMENTATION >SEDIMENTS >SURFACE SEDIMENT SAMPLES    [Definition]
BIOLOGICAL CLASSIFICATION >PROTISTS >DIATOMS    [Definition]
BIOLOGICAL CLASSIFICATION >PLANTS >MICROALGAE >DIATOMS
BIOSPHERE >AQUATIC ECOSYSTEMS >LAKES    [Definition]


ISO Topic Category
BIOTA
ENVIRONMENT
GEOSCIENTIFIC INFORMATION
INLAND WATERS


Access Constraints
None


Use Constraints
None


Keywords
The European Diatom Database
surface-sediment diatom assemblages
surface water acidification
eutrophication
climate change
Plantae
Plant
Chromista
Bacillariophyta
alkalinity
calcium
chloride
conductivity
magnesium
maximum depth of lake
pH
potassium
salinity
silica
site surface area at time of sampling
sodium
sulphate
total phosphorus
water depth of diatom sample


Data Set Progress
COMPLETE


Data Center
European Diatom Database, University of Newcastle, UK    [Information]
Data Center URL: http://craticula.ncl.ac.uk/Eddi/jsp/
Dataset ID: AfricaE

Data Center Personnel
Name: STEPHEN JUGGINS
Phone: 44 191 222 8799
Fax: 44 191 222 5421
Email: Stephen.Juggins at ncl.ac.uk
Contact Address:
University of Newcastle
Department of Geography
Newcastle upon Tyne
NEI 7RU
Country: UNITED KINGDOM



Distribution
Fees: None


Personnel
FRANCOISE GASSE
Role: TECHNICAL CONTACT
Phone: 33 4 42 97 15 70
Fax: 33 4 42 97 15 95
Email: gasse at cerege.fr
Contact Address:
CNRS-CEREGE, Europole Mediterraneen de l'Arbois- BP80
City: Aix en Provence Cedex 04
Postal Code: 13545
Country: France


TYLER B. STEVENS
Role: DIF AUTHOR
Phone: (301) 614-6898
Fax: 301-614-5268
Email: Tyler.B.Stevens at nasa.gov
Contact Address:
NASA Goddard Space Flight Center
Global Change Master Directory
City: Greenbelt
Province or State: MD
Postal Code: 20771
Country: USA


Publications/References
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
Publ., Dordrecht.

Gasse, F., 1986a. East African Diatoms. Taxonomy, ecological distribution.
Bibliotheca Diatomologica. Bd 11, 202 pp. .J. Cramer, Stuttgart.

Creation and Review Dates
DIF Creation Date: 2002-09-23
Last DIF Revision Date: 2012-12-21
Future DIF Review Date: 2003-09-23

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