Browsing by Author "Szendzina, Lidia"
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Item A NEW LOCALITY OF THE FRESHWATER POPULATION OF Ulva flexuosa subsp. pilifera (Chlorophyta, Ulvophyceae) IN POZNAŃ (WIELKOPOLSKA)(2011) Rybak, Andrzej; Messyasz, Beata; Szendzina, Lidia; Pikosz, Marta; Koperski, MaciejIn the latter part of the April of 2011 green algae thalli from the genus Ulva were found at the new, until now not known site in the Wielkopolska region. Thalli of Ulva (syn. Enteromorpha) flexuosa subsp. pilifera (Kützing) Bliding 1963 were collected to a further morphological research from the small, nameless, artificial dam reservoir located in the north part of Poznań. It was the second site, after the Malta Lake, of its taxon in Poznań and the sixth site in Poland. At the newly described site of Ulva flexuosa subsp. pilifera located near the west shore of the reservoir free-floating thalli were appeared in the sparseness (5-10 ind./m2). Moreover, individual thalli of Ulva strongly were covered by filamentous algae which formed dense mats on the water surface. Thalli of Ulva at the new site were observed from the end of April until the end of May of 2011.Item Accumulation of heavy metals (Co, Cr, Cu, Mn, Zn) in the freshwater alga Ulva type, sediments and water of the Wielkopolska region, Poland.(2013) Rybak, Andrzej; Messyasz, Beata; Pikosz, Marta; Szendzina, Lidia; Łęska, BogusławaThe concentration of five trace elements: cobalt (Co), chrome (Cr), copper (Cu), manganese (Mn) and zinc (Zn) was determined in the Ulva thalli, in the water and sediment collection from several inland sites (lakes, stream and river) from the Wielkopolska region during summer 2010. The multielemental analysis of the heavy metal concentration was carried out with the use of ICP-OES method. The aim of this study was to determine the role of tubular forms as biomonitoring species. The relative abundance of metals in sediment decreased in the order: Mn > Zn > Cu > Cr > Co and in the water: Cr > Mn > Zn > Cu > Co. In Ulva thalli the distribution order from higher to lower was Mn > Zn > Cr > Cu > Co. The results indicate that the concentration changes of heavy metals in thallus, water and sediment have some differences, but concentration distribution tends to be similar, because among the analysed heavy metals Mn has the highest concentrations while Co the lowest abundance in the thalli and sediment of all the sites. Possibility to use freshwater species from Ulva genus as bioindicators of water pollution by manganese requires further study.Item Fertility effects on Ulva thalli mass development in inland waters of Poland(2013) Messyasz, Beata; Rybak, Andrzej; Pikosz, Marta; Szendzina, LidiaThe genus Ulva (Ulvophyceae, Chlorophyta) consists of some 140 species which are present mainly in marine waters. Nine species occur in the inland waters in Poland (central Europe), of which U. flexuosa subsp. pilifera (Kützing) Bliding is the most widespread in the Wielkopolska region. The occurrence of Ulva species in any particular locality seems to be governed mainly by the availability of nutrients (N, P) than by the high levels of anthropogenic salinity in freshwaters. Freshwater Ulva can grow in different types of ecosystems from reservoir (Malta) through ponds (Tulce) or rivers (Nielba) and ending on drainage ditches. The main question addressed by this study was does the quantity and size of Ulva thalli increase together with the amount of nutrients in water? In addition, the aim of the study was to determine whether the development and the persistence for the long time of the big and dense Ulva patches exert influence for the aqueous ecosystem. We used freshwater Ulva as a model study species.Item Morphological and ultrastructural studies on Ulva flexuosa subsp. pilifera (Chlorophyta) from Poland(2013) Messyasz, Beata; Czerwik-Marcinkowska, Joanna; Massalski, Andrzej; Uher, Bohuslav; Rybak, Andrzej; Szendzina, Lidia; Pikosz, MartaUlva flexuosa subsp. pilifera (Kütz.) M. J. Wynne 2005 (= Enteromorpha pilifera Kützing 1845) was previously found in Argentina, the Czech Republic, Germany, Hungary, Romania, Slovakia and Sweden, recently also in Poland. The genus Ulva was first time described as Enteromorpha. Interestingly, Enteromorpha is used nowadays as a synonym for Ulva, a development which is based on molecular data. The morphologies of both young and mature specimens were studied, and most life cycle stages could be observed. Further, the formation of calcium carbonate crystals on the surface of Ulva thalli seems to influence the arrangement of the cells. A detailed ultrastructural (TEM) analysis of cell walls is presented. The TEM reveals in great details highly complex, irregular structures with stratification lines.Item Ulva flexuosa subsp. pilifera (Chlorophyta, Ulvophyceae) from the Wielkopolska region (West Poland): a new observation of the ultrastructure of vegetative cells(Springer, 2013) Messyasz, Beata; Czerwik-Marcinkowska, Joanna; Uher, Bohuslav; Rybak, Andrzej; Szendzina, Lidia; Pikosz, MartaUlva flexuosa subsp. pilifera previously known from northern Poland, from the channel near Szczecin and ponds near Łódź, has recently been found in the Malta Reservoir in the Wielkopolska (West Poland) region. Specimens collected in the Wielkopolska region were examined in detail, also under a transmission electron microscope (TEM). The morphometric analysis of Ulva thalli (both young and mature specimens) was performed in order to study the differences in the ultrastructure of vegetative cells. Rectangular cells in young thalli measured from 32.21 - 55.81 μm to 20.24 – 35.12 μm, and they formed clear longitudinal rows, while cells in the mature specimens ranged from 25.09 – 47.66 μm to 18.90 – 31.56 μm. This study indicates that vegetative cells of the mature thalli show tendency towards distortions of both the longitudinal and transverse cells arrangement. This distortion is determined by the development of possible carbonate calcium crystals on the thalli surface. The ultrastructural analysis (TEM) confirmed that the structure and placement of thylakoids is genus/species specific.