European Diatom Database-North African Dataset

Federal Geographic Data Committee (FGDC) Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator: Leila Ben Khelifa, Francoise Gasse
Publication_Date: Unknown
Title: European Diatom Database-North African Dataset
Edition:
Geospatial_Data_Presentation_Form:
Series_Information:
Series_Name:
Issue_Identification:
Publication_Information:
Publication_Place: Newcastle upon Tyne, United Kingdom
Publisher: The University of Newcastle
Other_Citation_Details:
Online_Linkage: http://craticula.ncl.ac.uk/Eddi/jsp/datasetdesc.jsp?DatasetId=AfricaN
Description:
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 North African dataset consists from samples from Tunisia (66), Algeria (3), Morocco (26), and Niger (20). In Tunisia, samples were collected from the Mediterranean northern regions to the margins of the Sahara southwards by L. Ben Khelifa and F. Gasse (1985-1989). In southern Tunisia, samples were taken from small permanent groundwater-fed waterbodies and temporary salt lakes, small artificial ponds developed around boreholes, and in mini reservoir lakes and swamps along Wadi el Akarit. Samples from hydrothermal springs have been collected throughout the country. In northern Tunisia, freshwater samples were also taken from the Mejerda Channel. Waters range from fresh to metasaline. Most samples are of the sodium/chloride or calcium-magnesium/ sulphate type. Diatoms were counted by L. Ben Khelifa. Details of diatom and hydrochemical analyses are given in Ben Khelifa (1989). Sites from southern Algeria, collected by F. Gasse en 1985, show clear similarities with the waterbodies of southern Tunisia. The 26 samples from Morroco were collected by F. Gasse in 1989 from 17 localities situated between 30?30-34?30N and 5?-7?30E, at altitude ranging from 300 to 2050 m. Sites are distributued in the western plains close to Casablanca, the Middle Atlas mountains, and the more arid southweast margins of the Atlas ranges, from a large variety of waterbodies (permanent and temporary natural lakes, man-made lakes, and wadis. Conductivities range from 195 to 3900 ?S cm-1. Freshwaters are of the calcium-sodium/bicarbonate type, while oligosaline waters are of the sodium/chloride type. Diatom samples were counted by F. Gasse. In southern Niger, samples were collected from the Niger River, the Bara salt pond near Niamey, and from interdunal depressions on the Manga Plateau occupied by permanent or ephemeral waterbodies. A few samples from northern Niger (A?r) have also been collected from groundwater-supplied ponds. Most waterbodies are of the sodium/carbonate-bicarbonate type. Samples from Niger were collected and analyzed by F. Gasse, except those from the Bara pond (M.-C. Lang). The main characteristics of the water chemistry and diatom communities of the Niger samples are presented in Gasse (1987).
Purpose:
Not Available
Supplemental_Information:
REFERENCE: Ben Khelifa, L., 1989. Diatom?es continentales et pal?omilieux du Sud-Tunisien (Palhydaf Site 1) au Quaternaire sup?rieur. Approche statistique bas?e sur les diatom?es et les milieux naturels. Thesis. Univ. Paris-Sud, 233 pp. Carvalho, L.R., Cox, E.J., Fritz, S.C., Juggins, S., Sims, PA., Gasse, F., and Battarbee, R.W., 1995, Standardizing the taxonomy of saline lake Cyclotella spp. Diatom Research, 10 (2) 229-240. El Hamouti, N., Lamb, H., Fontes, J.Ch. et Gasse, F., 1991. Changements hydroclimatiques abrupts dans le Moyen Atlas marocain depuis le dernier maximum glaciaire. C. R. Acad. Sci., Paris. 313 , 259-265. Fontes, J.Ch., Gasse, F., Callot, Y., Plaziat, J.C., Carbonel, P., Dupeuple, P.A. & Kaczmarska, I., 1985. Freshwater to marine-like environments from holocene lakes in Northern Sahara. Nature, 317, 608-610. Gasse, F., Fontes, J.Ch., Plaziat, J.C., Carbonel, P., Kaczmarska, I. , De Deckker, P., Souli?-Marsche, I., Callot, Y., & Dupeuple, P.A., 1987. Biological remains, geochemistry and stable isotopes for the reconstruction of environmental and hydrological changes in the Holocene lakes from North Sahara. Paleoecol., Palaeogeogr , Palaeoclimat., 60, 1-46. Gasse, F., 1987. Diatoms for reconstructing palaeoenvironments and palaeohydrologyn tropical semi-arid zones. Example of some lakes from Niger since 12,000 BP. Hydrobiologia, 154 : 127-163. Gasse, F., T?het, R., Durand, A., Gibert, E., Fontes, J.Ch., 1990. The arid-humid transition in the Sahara and the Sahel during the last deglaciation. Nature, vol. 346(6280):141-156. Gasse, F., Van Campo, E., 1994. Abrupt post-glacial climate events in West Asia and North Africa monsoon domains. EPSL, 126, 435-456. Lamb, H.F., Gasse, F., Ben Kaddour, A., El Hamouti, N., Van der Kaars, S., Perkins, W.T., Pearce, N.J., Roberts, C.N., 1995. Relation between century-scale Holocene arid intervals in tropical and temperate zones. Nature, 373,134-137.
Time_Period_of_Content:
Time_Period_Information:
Range_of_Dates/Times:
Beginning_Date: 19750101
Ending_Date: 19861231
Currentness_Reference:Unknown
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Description_of_Geographic_Extent:
Bounding_Coordinates:
West_Bounding_Coordinate: -6.5
East_Bounding_Coordinate: 10.5
North_Bounding_Coordinate: 37.07
South_Bounding_Coordinate: 31.0
Keywords:
Theme:
Theme_Keyword_Thesaurus: GCMD SCIENCE PARAMETERS
Theme_Keyword_Thesaurus: ANCILLARY KEYWORDS
Theme_Keyword_Thesaurus: ISO TOPIC CATEGORY
Theme_Keyword_Thesaurus: DATA SET LANGUAGE
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > GROUND WATER > GROUNDWATER CHEMISTRY
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > GROUND WATER > SALTWATER INTRUSION
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > LAKES > LAKEWATER CHEMICAL DATA
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > SURFACE WATER > RIVERS/STREAMS > NIGER RIVER
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > ALKALINITY
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > CONDUCTIVITY
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > PH > LAKEWATER PH TRANSFER FUNCTION
Theme_Keyword: EARTH SCIENCE > TERRESTRIAL HYDROSPHERE > WATER QUALITY/WATER CHEMISTRY > TRACE METALS
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > EROSION/SEDIMENTATION > SEDIMENT CHEMISTRY > SURFACE SEDIMENT SAMPLES
Theme_Keyword: EARTH SCIENCE > LAND SURFACE > EROSION/SEDIMENTATION > SEDIMENTS > SURFACE SEDIMENT SAMPLES
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PROTISTS > DIATOMS
Theme_Keyword: EARTH SCIENCE > BIOLOGICAL CLASSIFICATION > PLANTS > MICROALGAE > DIATOMS
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > LAKES
Theme_Keyword: EARTH SCIENCE > BIOSPHERE > AQUATIC ECOSYSTEMS > LAKES > SALINE LAKES > BARA SALT POND
Theme_Keyword: The European Diatom Database
Theme_Keyword: Surface-sediment Diatom Assemblages
Theme_Keyword: Surface Water Acidification
Theme_Keyword: Eutrophication
Theme_Keyword: Climate Change
Theme_Keyword: Plantae
Theme_Keyword: Plant
Theme_Keyword: Chromista
Theme_Keyword: Bacillariophyta
Theme_Keyword: Alkalinity
Theme_Keyword: Calcium
Theme_Keyword: Chloride
Theme_Keyword: Conductivity
Theme_Keyword: Magnesium
Theme_Keyword: Maximum Depth Of Lake
Theme_Keyword: Ph
Theme_Keyword: Potassium
Theme_Keyword: Salinity
Theme_Keyword: Silica
Theme_Keyword: Site Surface Area At Time Of Sampling
Theme_Keyword: Sodium
Theme_Keyword: Sulphate
Theme_Keyword: Total Phosphorus
Theme_Keyword: Water Depth Of Diatom Sample
Theme_Keyword: BIOTA
Theme_Keyword: ENVIRONMENT
Theme_Keyword: GEOSCIENTIFIC INFORMATION
Theme_Keyword: INLAND WATERS
Theme_Keyword: ENGLISH
Place:
Place_Keyword_Thesaurus: GCMD
Place_Keyword: CONTINENT > AFRICA > NORTHERN AFRICA > ALGERIA
Place_Keyword: CONTINENT > AFRICA > NORTHERN AFRICA > MOROCCO
Place_Keyword: CONTINENT > AFRICA > WESTERN AFRICA > NIGER
Place_Keyword: CONTINENT > AFRICA > NORTHERN AFRICA > TUNISIA
Access_Constraints: None
Use_Constraints:
None
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: FRANCOISE GASSE
Contact_Position: TECHNICAL CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: CNRS-CEREGE, Europole Mediterraneen de l'Arbois- BP80
City: Aix en Provence Cedex 04
Postal_Code: 13545
Country: France
Contact_Voice_Telephone: 33 4 42 97 15 70
Contact_Facsimile_Telephone: 33 4 42 97 15 95
Contact_Electronic_Mail_Address: gasse@cerege.fr
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Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Not Available
Logical_Consistency_Report:
Not Available
Completeness_Report:
Not Available
Lineage:
Process_Step:
Process_Description:
Not Available
Process_Date: Unknown
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Spatial_Reference_Information:
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Distribution_Information:
Distributor:
Contact_Information:
Contact_Organization_Primary:
Contact_Organization: U-NCL/EDDI > European Diatom Database, University of Newcastle, UK
Contact_Person: STEPHEN JUGGINS
Contact_Position: DATA CENTER CONTACT
Contact_Address:
Address_Type: Mailing and Physical Address
Address: University of Newcastle
Address: Department of Geography
Address: Newcastle upon Tyne
Address: NEI 7RU
Country: UNITED KINGDOM
Contact_Voice_Telephone: 44 191 222 8799
Contact_Facsimile_Telephone: 44 191 222 5421
Contact_Electronic_Mail_Address: Stephen.Juggins@ncl.ac.uk
Resource_Description: AfricaN
Distribution_Liability:
Not Available
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name:
http://craticula.ncl.ac.uk/Eddi/jsp/
Access_Instructions:
DATA CENTER URL
Digital_Transfer_Option:
Fees: None
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Metadata_Reference_Information:
Metadata_Date: 20020923
Metadata_Review_Date: 20121221
Metadata_Future_Review_Date: 20030923
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: TYLER B. STEVENS
Contact_Position: DIF AUTHOR
Contact_Address:
Address_Type: Mailing and Physical Address
Address: NASA Goddard Space Flight Center
Address: Global Change Master Directory
City: Greenbelt
State_or_Province: MD
Postal_Code: 20771
Country: USA
Contact_Voice_Telephone: (301) 614-6898
Contact_Facsimile_Telephone: 301-614-5268
Contact_Electronic_Mail_Address: Tyler.B.Stevens@nasa.gov
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
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