|Distribution and abundance of Tubificidae and Naididae (Oligochaeta) in a brackish-water fjord, with special reference to the α-mesohaline zone|
Pfannkuche, O. (1980). Distribution and abundance of Tubificidae and Naididae (Oligochaeta) in a brackish-water fjord, with special reference to the α-mesohaline zone. Neth. J. Sea Res. 14(1): 78-93
In: Netherlands Journal of Sea Research. Netherlands Institute for Sea Research (NIOZ): Groningen; Den Burg. ISSN 0077-7579, more
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The oligochaete fauna (tubificids and naidids) of the Schlei, a brackish- water fjord of the western Baltic (salinity range ahout 3 to 16‰ S), was investigated and 14 tubificid as well as 9 naidid species were identified. The distribution in relation to salinity was discussed. The horizontal and vertical distribution of the marine species are ruled by sediment characteristics (grain-size distribution, oxygen availability). Highest densities (40000 to 65000 specimens m-2) were found in well oxygenated coarse sands (Md > 300 µm). The depth distribution of tubificids was significantly controlled by the extension of the oxygenated sediment layer. Density and biomass (wet weights) of the marine tubificids remained rather constant during the year. Naidids showed strong seasonal fluctuations in density and biomass, up to a tenfold.