Roman Żurek - Academia.edu (original) (raw)
Papers by Roman Żurek
Oceanological and Hydrobiological Studies, 2007
Acta Hydrobiologica, 1988
Oceanological and Hydrobiological Studies, 2004
Polish Journal of Ecology, 2002
Acta Hydrobiologica, 2000
On 24th August, 1973, Dr. Janusz W o j t u s i a k , a participant cf the Polish Expedition in th... more On 24th August, 1973, Dr. Janusz W o j t u s i a k , a participant cf the Polish Expedition in the Hindu-Kush Mountains, organized by the Tatra Club of the Polish Tourist and Touring Society in Krakow, collected a number of specimens of aquatic fauna in an overflow-arm of the River Warduj in the region of the village cf Zebak (Badakhshan province) in the mountains of the Central Hindu-Kush (fig. 1). The collected material contained larvae of insects — bugs, mayflies, beetles, flies, water-mites, snails, crustaceans, rotifers, and oligochaetes. The individual groups of organisms were turned over to specialists for elaboration. In the present report Rotatoria, Cladocera, and Chironomidae (Diptera) have been elaborated.
Acta Hydrobiologica, 1980
Acta Hydrobiologica, 1992
Gospodarka Wodna, Jan 20, 2023
Wiertnictwo, Nafta, Gaz, 2017
Journal of Plankton Research, 1994
ABSTRACT The dependences of the numbers of individuals in the chief groups of zoopiankton on the ... more ABSTRACT The dependences of the numbers of individuals in the chief groups of zoopiankton on the size classes of phytoplankton were analysed. Four criteria were used in sorting phytoplankton: length, width, sum of length and width, and ‘surface’ (product of length and width). All dimensions measured were the maximum ones, i.e. including spines, mucilaginous sheaths, etc. Seasonal variability in the dimensions of algae was taken into consideration. The highest correlation coefficients ( r = 0.80) were obtained for rotifers using the surface criterion. Slightly lower values were found using length or the sum of the length and width. Cladocera and Copepoda significantly depended only on algae sorted according to length and also, to a very small degree, on algae sorted according to the sum of the length and width. Division of algae according to their surface seems to give more information than division according to only one dimension. In the spring and summer, the environment was occupied by the smallest phytoplankton species; later it was dominated by larger algae, and after that by still larger algae. Also considered is the use of apparent volume (as equivalent sphere volume to non-spherical-shaped particles circumscribed over their largest dimensions) to construct size spectra. However, apparent surface as a rectangle is less laborious to calculate, as is suggested here. Exemplifying coefficients, K , of apparent magnification of the dimensions of the algal thallus, resulting from various ways of expressing these dimensions, were calculated.
Aquatic Ecology, Jun 1, 2006
The chemical properties of water in the only flooded sulphur opencast mine in the world have been... more The chemical properties of water in the only flooded sulphur opencast mine in the world have been analysed. The reservoir has a depth of 22 m and is still continuously pumped, which affects the deeper tertiary aquifer. Instead of quaternary water being pumped out, tertiary water flows into the reservoir. Mineralisation of the water in this reservoir varied from 2000 to 10,000 mg dm−3 near the bottom. Light penetrates to 8–10 m and this photic layer is oxygenated. The hypolimnion is only partially oxygenated and contains H2S. The monimolimnion is salty and also poisoned by H2S. Discriminant analysis shows three layers: upper 0–10 m, transitional 10–15 m and bottom 15–22 m. Variability of the chemical properties is negligible through the year, excluding special situations such as ice melting. The transitional layer is rich in SO42− – about 1000 mg dm−3 and unionized H2S. S2− oxidation is very intensive, excess CaSO4 precipitates at a depth of 10 m resulting in opacity. Above and below, these concentrations diminish. For this zone a new name is proposed: the katalimnion. In the bottom layer, NO3− does not occur – whereas there is a high concentration of NH4+. Discrimination on the basis of chemical parameters divides the vertical profile into three levels: epi- + meta- + upper half of the hypolimnion, lower half of the hypolimnion and monimolimnion. This indicates that for sampling, three levels might be sufficient. The same analysis used for time showed a low differentiation in the annual cycle. These results can help in optimizing the monitoring scheme for this pit lake and reducing its cost.
Wiertnictwo, Nafta, Gaz, 2016
Aquatic Ecology, Dec 6, 2005
The zooplankton community of a flooded opencast sulphur mine was investigated during two years. T... more The zooplankton community of a flooded opencast sulphur mine was investigated during two years. The complicated physical and chemical relationships in this water-filled pit caused an atypical plankton assemblage. At the time of the investigation 20 species of rotifers, 6 of Cladocera, and 8 species of Copepoda were found. A single Ostracod and Chaoborus flavicans were also noted in the samples. Usually the epilimnion was monopolised by rotifers whereas the hypolimnion had a more diversified assemblage of rotifers, cladocerans and copepods. The result of clustering analysis indicated that each predator was associated with its own group of prey. Discrimination analyses showed weak seasonal differences in the zooplankton and three zones in the vertical profile – epilimnetic, upper hypolimnetic and anaerobic. Principal component analysis reduced the chemical parameters to the main contributors of conductivity (the main anions and cations) plus toxic sulphide and hydrogen sulphide. The animals were classified by the first two components into two groups: cold stenotherms and medium-sized filtrators, such as Bosmina longirostris. A specific analysis of vertical profiles generated five variants of diel vertical migrations. When time–space distributions of the plankters were analysed the highest numbers of different species were usually in different times and depths. The epilimnion was inhabited by small fishes and was dominated by rotifers but was free from C. flavicans which inhabited the cold hypolimnion, together with the remaining invertebrate predators (copepods and Asplanchna).Chaoborus and the other invertebrate predators participated more evenly in the contributions of species to the total density. In the presence of invertebrate predators the structure of the rotifer population shifted from soft-bodied species to spined or fast-moving species. When the predation pressure was too strong, as in the hypolimnion, the soft-bodied species were, in practice, absent. When the pit was in an oligotrophic state the hypolimnion population was composed of up to 60–90% rotifers. When the trophic state shifted to mesotrophy, the proportion of cladocerans increased.
Oceanological and Hydrobiological Studies, 2007
Acta Hydrobiologica, 1988
Oceanological and Hydrobiological Studies, 2004
Polish Journal of Ecology, 2002
Acta Hydrobiologica, 2000
On 24th August, 1973, Dr. Janusz W o j t u s i a k , a participant cf the Polish Expedition in th... more On 24th August, 1973, Dr. Janusz W o j t u s i a k , a participant cf the Polish Expedition in the Hindu-Kush Mountains, organized by the Tatra Club of the Polish Tourist and Touring Society in Krakow, collected a number of specimens of aquatic fauna in an overflow-arm of the River Warduj in the region of the village cf Zebak (Badakhshan province) in the mountains of the Central Hindu-Kush (fig. 1). The collected material contained larvae of insects — bugs, mayflies, beetles, flies, water-mites, snails, crustaceans, rotifers, and oligochaetes. The individual groups of organisms were turned over to specialists for elaboration. In the present report Rotatoria, Cladocera, and Chironomidae (Diptera) have been elaborated.
Acta Hydrobiologica, 1980
Acta Hydrobiologica, 1992
Gospodarka Wodna, Jan 20, 2023
Wiertnictwo, Nafta, Gaz, 2017
Journal of Plankton Research, 1994
ABSTRACT The dependences of the numbers of individuals in the chief groups of zoopiankton on the ... more ABSTRACT The dependences of the numbers of individuals in the chief groups of zoopiankton on the size classes of phytoplankton were analysed. Four criteria were used in sorting phytoplankton: length, width, sum of length and width, and ‘surface’ (product of length and width). All dimensions measured were the maximum ones, i.e. including spines, mucilaginous sheaths, etc. Seasonal variability in the dimensions of algae was taken into consideration. The highest correlation coefficients ( r = 0.80) were obtained for rotifers using the surface criterion. Slightly lower values were found using length or the sum of the length and width. Cladocera and Copepoda significantly depended only on algae sorted according to length and also, to a very small degree, on algae sorted according to the sum of the length and width. Division of algae according to their surface seems to give more information than division according to only one dimension. In the spring and summer, the environment was occupied by the smallest phytoplankton species; later it was dominated by larger algae, and after that by still larger algae. Also considered is the use of apparent volume (as equivalent sphere volume to non-spherical-shaped particles circumscribed over their largest dimensions) to construct size spectra. However, apparent surface as a rectangle is less laborious to calculate, as is suggested here. Exemplifying coefficients, K , of apparent magnification of the dimensions of the algal thallus, resulting from various ways of expressing these dimensions, were calculated.
Aquatic Ecology, Jun 1, 2006
The chemical properties of water in the only flooded sulphur opencast mine in the world have been... more The chemical properties of water in the only flooded sulphur opencast mine in the world have been analysed. The reservoir has a depth of 22 m and is still continuously pumped, which affects the deeper tertiary aquifer. Instead of quaternary water being pumped out, tertiary water flows into the reservoir. Mineralisation of the water in this reservoir varied from 2000 to 10,000 mg dm−3 near the bottom. Light penetrates to 8–10 m and this photic layer is oxygenated. The hypolimnion is only partially oxygenated and contains H2S. The monimolimnion is salty and also poisoned by H2S. Discriminant analysis shows three layers: upper 0–10 m, transitional 10–15 m and bottom 15–22 m. Variability of the chemical properties is negligible through the year, excluding special situations such as ice melting. The transitional layer is rich in SO42− – about 1000 mg dm−3 and unionized H2S. S2− oxidation is very intensive, excess CaSO4 precipitates at a depth of 10 m resulting in opacity. Above and below, these concentrations diminish. For this zone a new name is proposed: the katalimnion. In the bottom layer, NO3− does not occur – whereas there is a high concentration of NH4+. Discrimination on the basis of chemical parameters divides the vertical profile into three levels: epi- + meta- + upper half of the hypolimnion, lower half of the hypolimnion and monimolimnion. This indicates that for sampling, three levels might be sufficient. The same analysis used for time showed a low differentiation in the annual cycle. These results can help in optimizing the monitoring scheme for this pit lake and reducing its cost.
Wiertnictwo, Nafta, Gaz, 2016
Aquatic Ecology, Dec 6, 2005
The zooplankton community of a flooded opencast sulphur mine was investigated during two years. T... more The zooplankton community of a flooded opencast sulphur mine was investigated during two years. The complicated physical and chemical relationships in this water-filled pit caused an atypical plankton assemblage. At the time of the investigation 20 species of rotifers, 6 of Cladocera, and 8 species of Copepoda were found. A single Ostracod and Chaoborus flavicans were also noted in the samples. Usually the epilimnion was monopolised by rotifers whereas the hypolimnion had a more diversified assemblage of rotifers, cladocerans and copepods. The result of clustering analysis indicated that each predator was associated with its own group of prey. Discrimination analyses showed weak seasonal differences in the zooplankton and three zones in the vertical profile – epilimnetic, upper hypolimnetic and anaerobic. Principal component analysis reduced the chemical parameters to the main contributors of conductivity (the main anions and cations) plus toxic sulphide and hydrogen sulphide. The animals were classified by the first two components into two groups: cold stenotherms and medium-sized filtrators, such as Bosmina longirostris. A specific analysis of vertical profiles generated five variants of diel vertical migrations. When time–space distributions of the plankters were analysed the highest numbers of different species were usually in different times and depths. The epilimnion was inhabited by small fishes and was dominated by rotifers but was free from C. flavicans which inhabited the cold hypolimnion, together with the remaining invertebrate predators (copepods and Asplanchna).Chaoborus and the other invertebrate predators participated more evenly in the contributions of species to the total density. In the presence of invertebrate predators the structure of the rotifer population shifted from soft-bodied species to spined or fast-moving species. When the predation pressure was too strong, as in the hypolimnion, the soft-bodied species were, in practice, absent. When the pit was in an oligotrophic state the hypolimnion population was composed of up to 60–90% rotifers. When the trophic state shifted to mesotrophy, the proportion of cladocerans increased.