Materiały konferencyjne (WB)

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    CRYSTALS BANDS ON THE SURFACE OF FRESHWATER ULVA TAXA
    (2013-03-06) Messyasz, Beata; Rybak, Andrzej; Pikosz, Marta
    The incrustation process is an important occurrence whose effects were noticeable in the changes in growth of species from genera Ulva. It consisted in the precipitation of calcium carbonate on the surface of the cells wall of the freshwater macrogreen alga. The calcium carbonate occurred abundantly and formed characteristic bands on the surface of Ulva thalli. Surface incrustation of calcite was clearly rugged. In the first phase of development Ulva thalli growth naturally, could reach up to 1 m and was thin and smooth to the touch. It was correlation with small numbers of crystals on the surface. But with time, thalli becomes shorter and rough. The mass of deposit crystals increased with the age of Ulva thalli, which may constitute up to half of the dry weight of algae. The great density range of crystals was natural for mature thalli. The main aim of this study was to determine the morphology of the calcium carbonate crystals from the surface of freshwater Ulva taxa.
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    Freshwater Ulva (chlorophyta) as a bioaccumulator of heavy metals pollution in Nielba river (Wielkopolska region)
    (Ist Young Scientist Conference World Water Day, 2012-03) Messyasz, Beata; Rybak, Andrzej; Pikosz, Marta
    Human activities still increase and causes negative impact to environment and consequently lead to ecological degradation. Water pollution, whose source are pesticides and chemical fertilizers from catchment areas, in result enrich the aquatic environment in heavy metals. These water contamination is accumulated in tissues of living organisms. A high degree of accumulation of dissolved metals is noticeable in macroalgae. To the one of the most tolerant group to high levels of water contaminations belong both marine and freshwater green algae from Ulva genera. The main aim of these study was to show contamination levels of heavy metals (Cd, Ni and Pb) in the freshwater Ulva growing in polluted water in Nielba River.
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    The body size distribution of chosen species of Rotifera in different types of small water bodies in the Wielkopolska region
    (3rd European Pond Conservation Network Workshop, 2008-05) Basińska, Anna; Cichocka, Monika; Kuczyńska-Kippen, Natalia; Świdnicki, Kasper
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    The body size distribution of chosen species of rotifera in different types of small water bodies in the Wielkopolska region
    (2008) Basińska, Anna; Cichocka, Monika; Kuczyńska-Kippen, Natalia; Świdnicki, Kasper
    Small water bodies are often characterised by specific macrophytes species composition and different level of predation and this may also have an effect on the body length and shape of rotifer specimens. The main aim of the study was to determine the relation of rotifers representing different body size, towards specific kinds of pond (mid-forest, pastoral and man-made) and to three kinds of hydromacrophytes (nymphaeids, elodeids and helophytes) as well as comparatively to the open water zone. Five species of a wide range of distribution in various ecological habitats were analysed: Anuraeopsis fissa, Brachionus angularis, Filinia longiseta, Keratella cochlearis and K. quadrata. The examined water bodies differed in respect to fish presence. Morphometrical analysis of specimens of particular rotifer species showed that both the type of water body relating to different land use in the catchment area as well as microhabitat type significantly influenced their size and shape. E.g. Anuraeopsis fissa, whose specimens were significantly smaller in ponds with a strong anthropogenic impact, were found to be largest among stands of helophytes and smallest within the open water zone.
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