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Terrestrial pollen record of recent land-use changes around nine North African lakes in the CASSARINA Project

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dc.contributor.author Birks, Hilary H.
dc.contributor.author Birks, Harry John Betteley
dc.contributor.author Appleby, P. G.
dc.contributor.author Fathi, Adel A.
dc.contributor.author Flower, Roger J.
dc.contributor.author Kraïem, Mohammed M.
dc.contributor.author Patrick, Simon T.
dc.contributor.author Ramdani, Mohammed
dc.date.accessioned 2007-12-20T10:02:32Z
dc.date.available 2007-12-20T10:02:32Z
dc.date.issued 2001
dc.identifier.citation Aquatic Ecology 2001 35 (3/4): 431–448 en
dc.identifier.issn 1386-2588
dc.identifier.uri http://dx.doi.org/10.1023/A:1011988127627
dc.identifier.uri http://hdl.handle.net/1956/2514
dc.description.abstract Pollen analyses and related plant macrofossil records are presented from short cores from nine North African lakes in the EU-funded CASSARINA project. Terrestrial pollen reflects human impact on the vegetation and landscape over the last 150–100 years. Pollen changes, aided by radiometric dating, could be correlated with historical developments. The chronology of the landscape changes date other biostratigraphical records reflecting changes in the aquatic ecosystems. Three lakes in Morocco show gradually intensifying land-use over the last century. Accelerated technological development and landscape modification over the last 20 years culminated in one of the lakes being drained and cultivated during the project period. In Tunisia, a nationally unique acid-water lake is threatened by water withdrawal for increased catchment cultivation. The landscape around two other lakes is being increasingly cultivated and urbanised, and water withdrawal to support this has resulted in deleterious effects on the aquatic ecosystems, particularly at the internationally famous Garaet El Ichkeul where reed-marshes and macrophyte beds have been lost. The three lakes in the Egyptian Nile Delta are in the same hydrological system and show parallel changes in the balance between saltmarsh and reed-marsh. Control of Nile floods and year-round irrigation led to marked increases in cultivation in the delta region since ca. 1920. The Aswan High Dam (1964) had little detectable further effect. Documented planting of dates, palms, and olives and of introduced Casuarina and Eucalyptus trees provided a chronology to supplement the unsatisfactory radiometric dating of the sediments in this low-rainfall area. en
dc.language.iso eng en
dc.publisher Springer en
dc.subject CASSARINA Project en
dc.subject Egypt en
dc.subject human impact en
dc.subject Morocco en
dc.subject pollen analysis en
dc.subject Tunisia en
dc.title Terrestrial pollen record of recent land-use changes around nine North African lakes in the CASSARINA Project en
dc.type Peer reviewed en
dc.type Journal article en
dc.subject.nsi VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 no


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