Protistology 2 (2) 130-138 (2001) Use of salinity tolerance data for investigation of phylogeny of Paramecium (Ciliophora, Peniculia)
Alexei O. Smurov and Sergei I. Fokin
Zoological Institute, Russian Academy of Sciences, St. Petersburg, Russia, and
Summary
The purpose of our research was to test the hypothesis concerning the possibility to use tolerance polygons method in the taxonomy of
ciliates. 13 species of Paramecium were used in the experiments. Resemblance of tolerance polygons of investigated species was
estimated. Template of resemblance was clustered through the weighed pair-group method. There are 3 clusters in the graph of tolerant
polygons and potential tolerance resemblance. The largest, which includes 7 species (P. caudatum, P. jenningsi, P. multimicronucleatum, P.
primaurelia, P. biaurelia, P. sexaurelia, P. polycaryum) coincides with "aurelia" group. The small cluster that consists of 2 species - P. trichium
and P. bursaria corresponds to Jankowski's subgenus Helianter. Euryhaline species corresponding to "woodruffi" group - P. calkinsi, P.
duboscqui, P. nephridiatum and P. woodruffi form the third cluster.
Key words: Paramecium, potential tolerance, tolerance polygon, salinity
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