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Seasonal Variability of the Paramecium aurelia Complex in the Botanical Garden of the Jagiellonian University, Krak6w - in the Light of Species Composition and COI Haplotype Variation.
The temporal occurrence of some Paramecium aurelia species is still an intriguing problem as cysts were never reported to exist in the Paramecium genus. A sequence of species occurrence was studied (by strain crosses and molecular identification) in five water-bodies of the Jagiellonian University Botanical Garden in Krak6w in different sampling sites and different seasons of the year. In the current study 20 P. aurelia strains were isolated from collected water samples and identified as P. biaurelia, P. tetraurelia, P. sexaurelia (the first record in Poland), P. novaurelia (the first record in the Botanical Garden). Generally only one species was found in the particular water body in a single sampling point in a given season - an exception was observed in the case of some strains of P. tetraurelia and P. sexaurelia. The latter species were mostly isolated from two water bodies situated in the Palm Houses (higher temperature preference) and P. biaurelia with P. novaurelia from water bodies located outside (lower temperature preference). Sequencing of the COImtDNA fragment revealed 9 haplotypes in the studied area which were characteristic for particular species. The most variable species was P. sexaurelia - 8 strains studied and 3 haplotypes identified. In contrast, P. novaurelia has only one haplotype for 6 strains collected in different seasons. The present study supports the hypothesis that botanical garden water bodies may be a hot-spot for microbial eukaryotic species-such as Paramecium.
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