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THE COMPOSITION OF CYCLOPOID ASSEMBLAGES IN ECOLOGICALLY DIFFERENT GROUNDWATER HABITATS OF A DANUBE RIVERINE WETLAND IN AUSTRIA

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The cyclopoid assemblages of three groundwater monitoring sites in the Danube wetlands were investigated from mid 1996 to end 1997. One of these sites, located 200 m from surface waters, represents a stable, oligotrophic habitat (characterized by low temperature fluctuations and low dissolved organic carbon (DOC)-values). Six groundwater cyclopoids permanently inhabit this habitat. At two other sites, located closely to a backwater of the Danube and characterized by strong surface water influences, only four stygobitic cyclopoids occur altogether. These data support modern opinions, which stress that groundwater habitats are more heterogeneous and display higher biodiversity (i. e., higher species richness) of selected crustacean taxocoenoses (in this case, Cyclopoida) than expected earlier.

Die Grundwassercyclopiden dreier Untersuchungsstellen in den Donauauen wurden von Juni 1996 bis Dezember 1997 untersucht. Eine dieser Stellen reprasentierte ein stabiles, oligotrophes Habitat (charakterisiert durch geringe Temperaturschwankungen und niedrige ''dissolved organic carbon'' (DOC)-Werte). Dieses Habitat wurde von sechs Grundwassercyclopiden standig besiedelt, im Vergleich zu nur vier Arten an den beiden anderen Stellen zusammen, die durch das nahe Oberflachengewasser stark beeinflusst wurden. Diese Beobachtungen bestatigen die moderne Ansicht, dass im Grundwasser eine grossere Habitatdiversitat sowie eine grossere Biodiversitat (d. h., Artenreichtum) von ausgewahlten Crustaceen-Taxozonosen (in diesem Fall Cyclopoida) zu finden ist als bisher angenommen.

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