Ref ID : 3146
Stanislaw Radwan; [Wrotki (Rotatoria) torfianek okolic Parczewa] (The Rotifers (Rotatoria) of the Parczew Region Peat-bogs). Annales Universitatis Mariae Curie-Sklodowska Lublin-Polonia 19:215-230, 1974
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The aim of the paper was to study the rotifer fauna of four peat-hags in the Parczew region and the qualitative successions occurring in them depending on the changing abiotic factors of the habitat. The material was collected in a yearly cycle in the period from September 1964 to August 1965. 48 samples were collected and elaborated in all, in which 80 forms of rotifers were ascertained. Among these 4 species: Trichocerca inermis (Linder), Notommata allantois (Wulfert), Brachionus ahlstromi (Lindeman) and Tripleuchlanis plicata (Levander) were found to be new in Poland. Brachionus ahlstromi (Linderman) is also new in Europe. The next 13 species are rare in Polish fauna. The distribution of these species in the investigated peat-hags as well as in the rest of the country was described taking into account their habitat needs. In the ecological respect, the ascertained species were grouped into two associations: the epiphytic rotifer association (80% units of classification) and planktonic rotifer association (20% units of classification). It was revealed that the occurrence and distribution of species in individual peat-hags and seasons of the year, is of all contitioned by the pH and water temperature. In a few of the ascertained species, a distinct morphological changeability was observed. Three species were especially divergent: Keratella cochlearis (Gosse), which occurred in two series - tecta and robusta, K. testudo (Ehrenberg), and K. valga (Ehrenberg). This type of changeability is defined as an unadaptable morphological changeability.