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Zooplankton (Cladocera, Ostracoda), Chironomidae and other benthic faunal remains in sediment cores from nine North African wetland lakes: the CASSARINA Project

Bergen Open Research Archive

Show simple item record Ramdani, Mohammed eng Flower, Roger J. eng Elkhiati, Najat eng Birks, Hilary H. eng Kraïem, Mohammed M. eng Fathi, Adel A. eng 2007-12-20T10:21:22Z 2007-12-20T10:21:22Z 2001 eng
dc.identifier.citation Aquatic Ecology 2001 35 (3/4): 389-403 en
dc.identifier.issn 1386-2588 eng
dc.description.abstract Palaeolimnological studies were carried out on sediment cores from nine North African wetland lakes. The lakes represented a variety of habitats ranging from freshwater to mixohaline conditions and with and without direct connections to the sea. Sediment cores were examined for records of recent environmental change during the 20th century period. Faunal remains analysed in the sediments included those of Cladocera, Ostracoda, Chironomidae, Mollusca and, at the sites with marine connections, Foraminifera. Cyprideis torosa littoralis was the most common ostracod, occurring in sediments from the seven sites linked with the sea and also in brackish water Sidi Bou Rhaba. In acid Megene Chitane ostracods were scarce, being represented by a single species (Cypria ophtalmica). Candona neglecta completely disappeared at two sites (Sidi Bou Rhaba and Bokka) during the 20th century. Of the Cladocera, Chydorus sphaericus was common in the moderately mixohaline sites and but Heterocypris salina occurred only where marine salinities were occasionally achieved (in Zerga, Ichkeul and Korba). Microinvertebrate assemblages in the Nile Delta lake cores and to a less extent in Zerga showed a clear response indicative of more fresher conditions occurring during the latter part of the 20th century. However the freshening trend began prior to construction of the Aswan High Dam (mid 1960s). With the exception of the most saline site (Korba), microinvertebrate communiuties at all the CASSARINA sites have experienced major disturbances during the 20th century. Changes in freshwater availability associated with increased human usage of water resources is perceived as a major factor regulating the abundance and occurrence of aquatic microinvertebrate species at these sites. en
dc.language.iso eng eng
dc.publisher Springer eng
dc.subject Chironomidae eng
dc.subject Cladocera eng
dc.subject Foraminifera eng
dc.subject North African wetland lakes eng
dc.subject Ostracoda eng
dc.subject sediment cores eng
dc.title Zooplankton (Cladocera, Ostracoda), Chironomidae and other benthic faunal remains in sediment cores from nine North African wetland lakes: 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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