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The biodiversity of psammon rotifers in Włocławek Reservoir

Bielańska-Grajner I., Poznańska M.

Oceanological and Hydrobiological Studies

2010

Vol. 39, No.1

111-117

In total 47 rotifer taxa were found in the psammon of Włocławek Reservoir; 36 at the site in Dobiegniewo and 38 at Dobrzyń. Five species were classified as psammobionts, 14 as psammophiles, and the remaining ones as psammoxens. Psammobionts and psammophiles were observed mostly in the psammon at Dobiegniewo. The highest density of psammon rotifers was noted in the euarenal zone of the flooded part of the reservoir. However, the highest density in the area near the swift current was noted in the hygroarenal zone. While the flooded part of the reservoir had four dominant species of rotifer: Lecane closterocerca, L. scutata, Lepadella patella and Cephalodella catellina, the area near the swift current had only two: Cephalodella catellina and Brachionus quadridentatus. The most favorable conditions for the development of psammon rotifers was in the flooded area of the reservoir. In comparison with other dam-reservoirs in Poland, the community of these rotifer types in the Włocławek Reservoir was characterized by considerable species richness.

Novel Polish recordings of rare aquatic Oligochaeta species

Dumnicka E., Poznańska M.

Oceanological and Hydrobiological Studies

2006

Vol. 35, No.2

111-120

Two oligochaete species from the family Tubificidae: Peipsidrilus pusillus and Tubifex blanchardi, not previously reported from Poland, were found in the limnic part of the Włocławek Dam Reservoir. P. pusillus is known from lakes in Northern Europe and from a brook in the Czech Republic, while Tubifex blanchardi is known from fresh- and brackish waters, primarily strongly polluted waters, in North Africa and Southern Europe. Remarks on the distribution of Bothrioneurum vejdovskyanum, a species rarely found in Poland, are also included.