Wyniki wyszukiwania - Biblioteka Nauki

1

The influence of emergent and submerged macrophyte beds on ciliate communities in a shallow lake

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Mieczan T.

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2010

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tom Vol. 39, No.4

107-115

EN

Relationships between ciliates and the presence of emergent and submerged vegetation were studied in a shallow lake in eastern Poland. Samples were collected in zones of Phragmites, Typha, Batrachium, Elodea, Stratiotes and from the open water zone. The abundance and biomass of ciliates were significantly higher at sites with structurally most complex plants than in the open water or sparsely vegetated sites. The redundancy analysis indicated that bacterial abundance and total organic carbon were the most influential variables that determine the distribution of ciliates. However, chlorophyll a and Ptot have a lesser influence on the distribution of these microorganisms. Based on differences in macrophyte structure, two groups of habitats with similar patterns of size-related ciliate distribution were distinguished. The first group consisted of three vegetation zones of sparse stem structure and the open water zone, the second group comprised submerged macrophyte species, which were more complex.

2

Relationships among ciliated protozoa and water chemistry in small peat-bog reservoirs (Łęczna-Włodawa Lakeland, Eastern Poland)

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Mieczan T.

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2007

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tom Vol. 36, No.2

77-86

EN

The aims of this study were to identify the taxonomic and trophic diversity of planktonic ciliate communities occurring in small peat-bog reservoirs of various acidities (from about 3 to 6), and to assess the effects of chemical factors on them. Generally the highest numbers of ciliate taxa were recorded in high pH (>6) reservoirs, and the lowest in low pH (3.28-4.6) reservoirs. The mean numbers of planktonic ciliates in the high pH reservoirs were about three times higher than in the low pH reservoirs. However, the greatest biomass of ciliates occurred in low pH reservoirs. The results suggest that pH, conductivity and total organic carbon (TOC) are more important than total phosphorus (Ptot) in the distribution of planktonic ciliates in peat-bog reservoirs. In the low pH peat-bog reservoirs, the biggest factor affecting ciliate distribution is the pH of the water, whilst in the higher pH reservoirs the role of organic matter becomes increasingly important with increasing pH.

3

Diversity and vertical distribution of planktonic ciliates in a stratified mesotrophic lake: relationship to environmental conditions

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Mieczan T.

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2008

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tom Vol. 37, No.1

83-95

EN

The density and biomass of planktonic ciliates significantly differed between sample sites in a deep, mesotrophic lake, with the lowest numbers in the hypolimnion and the highest in the epilimnion. The community composition varied greatly with depth. Oligotrichs dominated in the epilimnion, where prostomatids and peritrichs were also important components of the community. The density of oligotrichs and peritrichs decreased in the metalimnion, and they were absent from the hypolimnion. In the deep metalimnion the most abundant groups were prostomatids, haptorids and scuticociliates. In the hypolimnion, the ciliate community was dominated by scuticociliates and heterotrichs. In the epilimnion and metalimnion a significant positive correlation was observed between ciliate numbers, chlorophyll a and heterotrophic flagellate density. In all three zones the number of ciliates was most strongly correlated with water temperature, concentrations of total organic carbon (TOC), total phosphorus (Ptot) and bacterial density, whilst in the hypolimnion there was a significant correlation between ciliate numbers and the dissolved oxygen concentration.

4

Vertical micro-distribution of psammonic ciliates and their relationship to physical and chemical parameters in two lakes of different trophic status

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Mieczan T. , Nawrot D.

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2012

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tom Vol. 41, No. 2

48-56

EN

The aim of this study was to examine the community structure and vertical micro-distribution of psammonic ciliates in two lakes of different trophic status in eastern Poland. Additionally, the size and trophic structure of these microorganisms, and the influence of physical and chemical water parameters on their abundance, were analysed. Psammon samples were collected during spring, summer, and autumn of 2010. In each of the lakes samples were collected in the euarenal, higroarenal, and hydroarenal zones of the psammolittoral. In order to determine the micro-vertical distribution of ciliates, each sample was divided into two sub-samples: the upper part (0-1cm) and the lower part (1-2cm). The species diversity of ciliates decreased with depth. The tendency was particularly clear in mesotrophic lakes. Irrespective of the lake’s trophic type and arenal zones, significantly higher numbers and biomass of ciliates were recorded in the surface layer of the psammolittoral. The upper layer of sand was dominated by omnivorous taxa, whereas the deeper layer showed increases in the proportions of bacterivore species. The factors limiting the occurrence of ciliates are mainly concentrations of total organic carbon and nutrients.

5

Influence of type of substrate and water chemistry on the structure and succession of periphytic ciliate communities in hypertrophic lake

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Mieczan T. , Puk A.

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2010

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tom Vol. 36, no. 2

13-24

EN

The aims of the study was to establish whether differences exist between periphytic ciliate communities on different substrates; to determine whether colonization time would yield an abundance and taxonomic composition of ciliates; to assess the effect of physical and chemical factors on the distribution of ciliates in a shallow hypertrophic lake. Generally the species richness as well as the abundance of periphytic ciliates are determined mostly by the habitats and chemical properties of the waters (especially the content of total organic carbon and nitrate nitrogen), and, to a lesser extent, by the type of the colonized substrate. Moreover, exposition time of the substrates affected both an increase in the richness of periphytic ciliates and the changes in their trophic structure. At the beginning of the experiment the substrates were intensively colonized by typically bacterivorous species, yet prolonged exposition time resulted in an increasing proportion of omnivorous species.

PL

Celem pracy było porównanie składu taksonomicznego i liczebności zespołu orzęsków peryfitonowych zasiedlających różne podłoża; określenie, w jaki sposób czas ekspozycji podłoży wpływa na obfitość tych mikroorganizmów oraz analiza zależności pomiędzy wybranymi właściwościami fizyczno-chemicznymi wód a orzęskami w jeziorze hypertroficznym. Wykazano, że zarówno bogactwo gatunkowe jak i obfitość orzęsków peryfitonowych w największym stopniu determinują zasoby pokarmowe siedliska oraz właściwości chemiczne wód (głównie zawartość całkowitego węgla organicznego oraz azotu azotanowego), w mniejszym zaś stopniu rodzaj kolonizowanego podłoża. Czas ekspozycji podłoży wpływał zarówno na wzrost obfitości peryfitonowych orzęsków jak i zmianę ich struktury troficznej. Na początku eksperymentu podłoża były intensywnie kolonizowane przez gatunki typowo bakteriożerne, wraz ze wzrostem czasu ekspozycji podłoży wzrastał udział gatunków wszystkożernych.