Bergen Open Research Archive

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

Bergen Open Research Archive

Show simple item record Birks, Hilary H. eng Birks, Harry John Betteley eng Appleby, P. G. eng Fathi, Adel A. eng Flower, Roger J. eng Kraïem, Mohammed M. eng Patrick, Simon T. eng Ramdani, Mohammed eng 2007-12-20T10:02:32Z 2007-12-20T10:02:32Z 2001 eng
dc.identifier.citation Aquatic Ecology 2001 35 (3/4): 431–448 en
dc.identifier.issn 1386-2588 eng
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 eng
dc.publisher Springer eng
dc.subject CASSARINA Project eng
dc.subject Egypt eng
dc.subject human impact eng
dc.subject Morocco eng
dc.subject pollen analysis eng
dc.subject Tunisia eng
dc.title Terrestrial pollen record of recent land-use changes around nine North African lakes in the CASSARINA Project eng
dc.type Peer reviewed eng
dc.type Journal article eng
dc.subject.nsi VDP::Matematikk og Naturvitenskap: 400::Zoologiske og botaniske fag: 480 nob
bora.peerreviewed Peer reviewed eng
bibo.doi eng

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