Ref ID : 2814
Kurt Wulfert; [Die Radertiere saurer Gewasser der Dubener Heide III. Die Rotatorien des Presseler und des Winkelmuhler Teiches]. Arch.Hydrobiol. 58(1):72-102, 1961
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The author concludes his record with an account of the rotifer fauna of two ponds at Pressel and Winkelmuhle, on the Dubener heathland. As a consequence of extensive plant decomposition, they are rich in food material, and show a reaction of pH 6.0. The observations extended from August to December, 1959. Particular attention was paid to the transition to winter conditions. Some 120 species were listed. The forms taken from the littoral and bottom zones were always the most numerous in species but the smallest in number of individuals. On the other hand, the plankton forms were populous, though no to be compared with the populations to be found in alkaline pools. The commonest species in the present instance were Gastropus hyptopus, Polyarthra vulgaris and P. remata, Synchaeta pectinata and Keratella cochlearis, these being chiefly in Form A and later in Form B. Only a few examples of Keratella quadrata were found by chance, while the extensive genera Brachionus and Filinia were entirely absent. The onset of low temperature had only slight influence on littoral forms. By mid-October, Macrochaetus and Ploesoma had disappeared, as also, in the plankton, Asplanchna species had. At this period, however, Dorystoma caudata reached its maximum, and there also appeared the cold-tolerant Notholca species and various Trichocercas. Trichotria similis Stenroos, regarded as being a doubtful species, was taken in large number and its right to specific rank was recognised. Some new varieties and 12 new species are described.