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1

Use of rotifer trophic state indices to show the effect of hydrobionts and nutrients on water trophic status in mesocosms

Ejsmont-Karabin Jolanta, Feniova Irina, Kostrzewska-Szlakowska Iwona, Rzepecki Marek, Petrosyan Varos G., Dzialowski Andrew R.

Oceanological and Hydrobiological Studies

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2020

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Vol. 49, No. 2

123--131

EN

We have determined how Crustacea, zebra mussels (Dreissena polymorpha), fish and nutrients affect the trophic state in mesocosms filled with water collected from the pelagic zone of a eutrophic lake. We hypothesized that the pool of nutrients would increase both directly due to the input of phosphorus and nitrogen and/or indirectly due to the introduction of animal biomass. We used trophic state indices based on the abundance and species structure of rotifers to assess changes in the trophic state in mesocosms. The role of small detritophages in rotifer communities increased as a result of treatments. Our results clearly demonstrated that D. polymorpha was able to reduce the trophic status of mesocosm waters as indicated by reduced rotifer trophic state indices regardless of interactions with other treatment factors. Contrary to our expectations, neither the nutrients added at the beginning of the experiment nor the introduction of crustaceans or fish affected the rotifer trophic indices.

2

Navicula dermochelycola sp. nov., presumably an exclusively epizoic diatom on sea turtles Dermochelys coriacea and Lepidochelys olivacea from French Guiana

Riaux-Gobin Catherine, Witkowski Andrzej, Kociolek John Patrick, Chevallier Damien

Oceanological and Hydrobiological Studies

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2020

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Vol. 49, No. 2

132--139

EN

Epizoic diatom communities were studied on four turtle species (Chelonia mydas L., Eretmochelys imbricata L., Lepidochelys olivacea Eschscholtz and Dermochelys coriacea Vandelli) from the Eastern Caribbean, the Equatorial West Atlantic and the South Pacific. In the present study, we focused on one taxon of Navicula Bory de Saint-Vincent, described here as a new taxon, which was found on seven individuals of Dermochelys coriacea and one individual of Lepidochelys olivacea in French Guiana. The new Navicula taxon was found neither on Chelonia mydas (83 specimens examined) nor Eretmochelys imbricata (13 specimens examined). Furthermore, the new taxon appears to have a restricted biogeography, as so far it has only been reported from French Guiana. A species of Navicula is reported for the first time as a supposedly exclusive epizoic taxon. Navicula dermochelycola sp. nov. is characterized in detail; its ultrastructure is described and compared with other members of Navicula.

3

Analysis of zooplankton assemblages from man-made ditches in relation to current velocity

Czerniawski R., Sługocki Ł

Oceanological and Hydrobiological Studies

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2017

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Vol. 46, No. 2

199--211

EN

Because of the slow current velocity, man-made ditches may create distinct physical and ecological conditions that are suitable for the growth of zooplankton populations. However, the influence of drainage ditches on zooplankton communities has not been studied yet. This study aims to answer the following questions: i) Are man-made ditches a rich source of zooplankton? ii) What current velocity value leads to abundant zooplankton in man-made ditches? iii) Do zooplankton communities differ between man-made ditches and connected natural streams? In man-made drainage ditches with a water current lower than 0.1 m s-1, the abundance of zooplankton was greater than in the majority of streams. Sometimes this level of abundance was equivalent to the densities of zooplankton in lakes or dammed reservoirs. The presence of zooplankton in man-made ditches may be of great importance to the establishment of food webs, particularly during periods of high water levels or heavy rainfall, both of which may accelerate the water current, causing the dispersion of zooplankton along the ditches and into natural streams.

4

Biodiversity of rotifers in urban water reservoirs of Southern Poland

Pociecha A., Wilk-Woźniak E., Mróz W., Bielańska-Grajner I., Gadzinowska J., Walusiak E.

Oceanological and Hydrobiological Studies

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2015

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Vol. 44, No. 3

335--342

EN

Rotifer diversity was studied in three different types of artificial water bodies situated in one of the largest cities in Poland. The bodies of water were as follows: a fountain in a city park, the Nowa Huta dam reservoir, and the Bagry gravelpit. The lowest number of rotifer species (23) was noted in the urban fountain, and the highest (36) in the Bagry gravel-pit lake. Rotifers’ communities in the investigated water reservoirs showed different levels of diversity and density. The most numerous species in the dam reservoir was Trichocerca similis (2511 ind. l-1) and in the Bagry gravel-pit lake was Polyarthra dolichoptera (2634 ind. l-1). However, the most abundant species in the fountain was Brachionus urceolaris (863 ind. l-1). The highest values of Shannon and evenness diversity indices were found in the Bagry gravel-pit lake (H’ = 2.521, J’ = 0.783), while the lowest in the urban fountain (H’ = 0.568, J’ = 0.258). The DCA analysis (Detrended Correspondence Analysis) showed that the diversity of rotifers communities in the studied reservoirs was related to the concentration of magnesium and calcium, and to water conductivity.

5

Epizoic communities of Rotifera inhabiting sponges in freshwaters of North-Eastern Poland

Bołtruszko J. S., Ejsmont–Karabin J.

Oceanological and Hydrobiological Studies

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2013

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Vol. 42, No. 1

46-50

EN

The species structure of epizoic communities of Rotifera was analyzed on three species of freshwater sponges: Spongilla fragilis Leydy, Spongilla lacustris (L.) Vejd. and Ephydatia fluviatilis (L.) Vejd. In total, all studied sponges hosted 87 rotifer species. Epizoic communities of Rotifera from particular sponges were very diverse, reach in species and unique. Thus, sponges covering both natural substrates and artifacts may create "hot-points" of rotifer species diversity and therefore may play an important role in re-naturalization of wastes.

6

The usefulness of zooplankton as lake ecosystem indicators : Rotifer Trophic State Index

Ejsmont-Karabin J.

Polish Journal of Ecology

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2012

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Vol. 60, nr 2

339-350

EN

Eutrophication is still one of the most important, world . wide problems of surface waters. During last decades there is the increasing demand for effective methods of monitoring systems based on biotic indices. For practical application, the monitoring tools must satisfy certain requirements: (1) sampling should be quick and easy; (2) indices should be straightforward to calculate. The aim of the study was to test the usefulness of rotifer abundance and species composition as indicators of trophic state of lakes. Data on rotifer densities and taxonomic composition were collected in 41 dimictic and 33 polymictic lakes situated in northeastern Poland. The samples were taken once a year, during the summer stagnation period at 1 m intervals from the surface to the bottom of the epilimnion layer in thermally stratified lakes and from the surface to the bottom of shallow lakes. The data were used to estimate the relationship between the rotifer community structure and the indices of trophic state of lakes (TSI), like concentration of chlorophyll a and Secchi.s disc visibility, (as the estimator of suspended particulate material in the water) calculated according to Carlson (1977) and widely used recently. The estimations were made separately for dimictic and polymictic lakes. However, regressions for the relationships between the trophic state of lakes based on mean values for Secchi.s disc (TSI[SD]) and chlorophyll a content (TSI[CHL]) and rotifer indices for both groups of lakes, usually were not different. Thus the same regression equations may be used for both dimictic and polymictic lakes.The following formulas for rotifer TSI index (TSI[ROT]) were found: (1) rotifer numbers (N, ind. L[^-1]): TSI[ROT1] = 5.38 Ln(N) + 19.28; (2) total biomass of rotifer community (B, mg w.wt. L[^-1]): TSI[ROT2] = 5.63 Ln(B) + 64.47; (3) percentage of bacterivores in total rotifer numbers (BAC, %): TSI[ROT3] = 0.23 BAC+ 44.30; (4) ratio of biomass to numbers (B:N, mg w.wt. ind.[^-1]): TSI[ROT4] = 3.85 (B:N)[^-0.318]; (5) percentage of the tecta form in the population of Keratella cochlearis (TECTA, %): TSI[ROT5] = 0.198 TECTA + 48.8 for dimictic lakes and TSI[ROT5] = 0.144 TECTA + 54.8 for polymictic ones; (6) contribution of species which indicate high trophic state in the indicatory group.s numbers (IHT, %): TSI[ROT6] = 0.203 IHT + 40.0. It was assumed that the lakes with a TSI[ROT ]under 45 are mesotrophic, those with a TSI[ROT] value of 45.55 are meso-eutrophic, 55.65 - eutrophic and those with a TSI[ROT] above 65 - hypertrophic. The formulas may be useful in preparing similar indices for lakes in central and northern Europe.

7

Rotifera communities associated with invasive Vallisneria spiralis L. (Hydrocharitaceae) versus native macrophytes in the lakes heated by power stations (Konin lakes, W. Poland)

Ejsmont-Karabin J., Hutorowicz A.

Polish Journal of Ecology

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2011

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Vol. 59, nr 3

569-576

EN

The role that invasive Vallisneria spiralis L. plays in determining the species richness of the rotifer community was examined in the littoral zone of two heated (by power stations) lakes near Konin (W. Poland) (Lake Licheńskie - area 153.6 ha, max. depth 13.3 m and Lake Ślesińskie - area 148.1 ha, max. depth 25.7 m). Vallisneria spiralis is a thermophilic and vegetative reproducing species which has been recorded in the lakes since the 1990s. It spreads very quickly in the lakes, forming monospecific, dense beds which, force out all other submerged vegetation. Samples were collected in August 2004 on 8 littoral stations of Lake Licheńskie and Ślesińskie. Five-liter samples of water (plankton species) and macrophytes (epiphytic species) were elaborated separately. An analysis of the taxonomic structure of rotifer communities inhabiting single-species Vallisneria beds and mixed-species (Vallisneria plus other macrophyte species) beds showed that both communities were relatively rich in species and similar in terms of species composition. A total of 100 species of Monogononta were identified. Single-species Vallisneria beds were inhabited by 77 species, whereas 82 species were found at stations with mixed vegetation. Species diversity was relatively high in both types of macrophyte assemblages. Numbers of rotifer species inhabiting the single-species Vallisneria beds are among the average values observed in a littoral zone rich in macrophyte species from lakes of different morphometry and trophic state. The above observations confirm part of the conclusions from literature that invasions by new plant species do not always lead to a decline in the habitat value for native animals. Otherwise, the invaded plant creates the habitat easily colonized by the native plankton and epiphytic invertebrates.

8

Does invasion of Vallisneria spiralis L. promote appearance of rare and new rotifer (Rotifera) species in littoral of the lakes heated by power station (Konin lakes, W. Poland)?

Ejsmont-Karabin J.

Polish Journal of Ecology

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2011

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Vol. 59, nr 1

201-207

EN

Large-scale human-caused ecosystem disturbances may create new habitats. A good example may be long-lasting disturbances in five lakes (area from 148 to 379 ha, max. depth from 3 to 38 m) integrated into the cooling system of the power plants near Konin (52[degrees]17.8'-52[degrees]23.3N, 18[degrees]14.4'-18[degrees]20.7'E, West Poland). In the middle of the 1990s Vallisneria spiralis began to colonize littoral zone of three of lakes and in 2002 it appeared also in fourth one. This species formed dense patches and almost completely displaced other submerged macrophytes. An aim of the study was to test a hypothesis that the appearance of rare and new for Polish fauna rotifer species might be a result of changes in littoral habitats of these lakes particularly caused by the invasion by Vallisneria spiralis. Studies were carried out in the years 2004-2006 on 3-6 littoral stations in each lake. Five-liter samples of water with macrophytes were collected from a center of macrophyte beds. Plankton (free-swimming) and epiphytic (connected with macrophyte surface) samples were elaborated separately. As many as 167 monogonont species were recorded during the three-years. studies. From among them 6 species were new in Polish fauna. These were: Asplanchnopus hyalinus Harring, Beauchampia crucigera (Dutrochet). Lecane inopinata Harring & Myers, Lecane shieli Segers et Sanoamuang, Lecane undulata Hauer and Lepadella apsida Harring. The species are eurythermic or warm-stenothermic. Species new to the rotifer fauna of Poland were not numerous as they usually constituted less than 2% of the total density of rotifers. Thus, although the hypothesis that rare and new for Polish fauna rotifer species may appear in the littoral habitats of the heated Konin lakes was confirmed, it was also clear that the colonization of the habitats by rotifer invaders did not lead to their domination in the rotifer communities.

9

Spatial distribution of rotifers (Rotifera) in monospecies beds of invasive Vallisneria spiralis L. in heated lakes

Ejsmont-Karabin J., Hutorowicz A.

Oceanological and Hydrobiological Studies

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2011

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Vol. 40, No.4

71-76

EN

Species abundance and richness of rotifer communities occupying monospecies beds of Vallisneria was studied in Lake Licheńskie included in the open cooling system of heat and power stations. Differences were found in rotifer numbers, species composition and diversity between sampling points within the same location and between the locations. Factors that seem to be responsible for the high diversity of rotifer communities inhabiting Vallisneria beds are: large-scale horizontal diversity (between macrophyte patches), small-scale horizontal diversity (within patches) and the high vulnerability of Vallisneria epiphyton to disturbances caused by wave action.

10

Epizoic communities of Rotifera on freshwater bivalves

Bołtruszko J.S.

Oceanological and Hydrobiological Studies

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2010

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Vol. 39, No.4

75-82

EN

The species structure of epizoic communities of Rotifera was analyzed on three species of freshwater bivalves: Anodonta anatina (Linnaeus), A. cygnea (Linnaeus) and Unio tumidus (Philipsson) from lakes and rivers of north-eastern Poland. Epizoic rotifer communities were abundant and relatively rich in species. The communities were mostly built of common littoral species, like Colurella uncinata, Lecane flexilis, Lepadella quadricarinata, Ptygura melicerta. They were accompanied by species typical for pelagic waters (e.g. Trichocerca pusilla, T. similis). Bivalves inhabiting outflows of rivers from Knyszyn Forest had the most diversified and abundant epizoic communities. Large differences were also observed as regards particular species occurrence in different habitats. Maximum numbers of Ptygura melicerta living on the surface of bivalves from rivers accounted for 150 individuals per bivalve specimen, whereas those living on animals from lakes - up to 10 individuals. All studied bivalves were colonized by very large numbers of bdelloids.

11

Vertical microzonation of psammon rotifers (Rotifera) in the psammolittoral habitat of an eutrophic lake

Ejsmont-Karabin J.

Polish Journal of Ecology

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2008

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Vol. 56, nr 2

351-357

EN

Hydroarenal is a layer of submerged sands along the edge of a lake. Organisms living in interstitial spaces of this zone create a community called hydropsammon. Microzonation and seasonal dynamics of hydropsammon rotifers were studied in psammolittoral of deep, eutrophic Lake Mikołajskie (North-eastern Poland) in 2005. An aim of the study was to test the hypothesis that the top 0.5 cm of bottom sands (=epihydroarenal) plays a role of a transitory microzone between adjacent water layer and a deeper 1.5 cm layer of sands (=endohydroarenal). Sampling cores were taken at a station 1.5 m from water's edge once or twice a month since April till October 2005. Three samples were taken: 5-cm thick water layer (AWL - adjacent water layer), 0.5-cm thick layer of water and sand from the transitory level (EPIH - epihydropsammon) and 2-cm thick slice of sand (ENDOH - endohydropsammon). From 94 species found in the lake 15% were restricted to AWL, 20% to endohydropsammon and only 5% to epihydropsammon. From 57 species found in epihydroarenal 52 (91%) were common with neighboring microlayers, i.e. AWL and endohydroarenal. The highest rotifer densities were noted in the endohydroarenal zone if expressed in area units. However, the rotifer densities in epipsammon if expressed in the same volume of occupied environment were ca 40 times higher than in adjacent water and about twice of those noted in endohydroarenal. This may suggest that epihydroarenal plays a role of both a transitory zone and a refugium for animals from adjacent water layer. Reasons for this phenomenon are still not clear.

12

Daily changes of the vertical micro-distribution of Rotifera in lake psammolittoral

Ejsmont-Karabin J.

Polish Journal of Ecology

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2008

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Vol. 56, nr 4

717-722

EN

Studies were conducted in littoral sand deposits of a eutrophic, deep lake (Lake Mikołajskie, Masurian Lakeland, Poland) in aim to test the hypothesis that epihydroarenal (the most upper layer of sand deposits) may play a role of a refuge from visual predators for rotifers from adjacent water layer. However, a comparison of the daily vertical distribution of the rotifer community structure and densities in microlayers of the lake psammolittoral, i.e. adjacent water layer (5.0-0.0 cm), epihydroarenal (0-0.5 cm) and three microlayers of endohydroarenal (0.5-1.0 cm, 1.0-1.5 cm and 1.5-2.0 cm) revealed a lack of up-and-down vertical migrations of the animals. During day and night hours, both on 5/6 and 11/12 July, rotifers were concentrated in epihydroarenal. In all cases 64 to 85% of rotifer community inhabited this layer, whereas up to 4% occurred in adjacent water layer. Large and permanently renewed food resources (algae and bacteria) in the most upper layer of sand deposits form a very thin layer that can be called "a canteen". This may explain permanent concentration of rotifers in the layer.

13

Diel vertical distribution of zooplankton in Piaseczno Lake (Wdecki Landscape Park) – II. Rotifera

Grzegorz G., Klimaszyk P., Kuczyńska-Kippen N.

Oceanological and Hydrobiological Studies

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2006

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Vol. 35, No.1

29-37

EN

Vertical distribution of chosen species of Rotifera was studied in Piaseczno Lake, during a water stagnation period, in the summer of 2004. Environmental factors, such as temperature, dissolved oxygen and water transparency in the whole water column were measured. The presence of a total of 45 species of Rotifera was found. The analysis of the diel vertical distribution of the examined species of rotifer communities revealed differentiated models. Diel vertical migrations were observed in the case of Gastropus stylifer, Asplanchna priodonta and Trichocerca similis. The remaining species (Kellicottia longispina, Polyarthra dolichopter and P. vulgaris) did not undergo migrations, they remained within a certain water layer throughout the day and night. These differences in the diel behaviour of particular species of rotifers may be mostly dependent on particular ecological requirements and different forms of predation caused by invertebrate and young fish predators.

14

Role of zooplankton (Ciliata, Rotifera and Crustacea) in phosphorus removal from cycling : lakes of the river Jorka watershed (Masurian Lakeland, Poland)

Ejsmont-Karabin J., Gorelysheva Z., Kalinowska K., Węgleńska T.

Polish Journal of Ecology

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2004

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Vol. 52, nr 3

275-284

EN

According to a theory of lake restoration through foot web manipulation, the removal of planktivorous fish results in the development of large cladocerans (mostly daphnids) and, consequently, in reduction of algal biomass. However, as a rule, publications devoted to different aspects of the theory completely neglected other groups of plankton invertebrates, thought they may reach very high densities. Investigations carried out in five Masurian lakes differing in trophic state and mixis showed that in most lakes the role of small cladocerans, copepods, rotifers and protozoans in the consumption of algal food and nutrient regeneration was more important than the role of large daphnids. Daphnia cucullata played more significant role (excreting 28% of the regenerated P) during "clear water phase" only in one lake - Lake Głębokie. In the remaining lakes more important was an impact of Bosmina longirostris (11-59% of the regenerated P), younger stages of cyclopoids (23%), ciliate Strobilidium humile (20%) or detritophagous rotifer Keratella cochlearis (21%). Evidenced in many papers special role of large cladocerans in clearing lake water is explained by their combined direct (by "efficient" filtering) and indirect (suppression of ciliates and rotifers through predation, interference and resource competition) impact on nutrient sedimentation or exclusion from internal cycling.

15

Are community composition and abundance of psammon Rotifera related to grain-size structure of beach sand in lakes?

Ejsmont-Karabin J.

Polish Journal of Ecology

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2004

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Vol. 52, nr 3

363-368

EN

The aim of the study was top test the hypothesis that the size distribution of sand grains in lake beach should affect the species composition, densities and body-size structure of psammon communities of Rotifera. Studies were carried out in hydro-, hydro- and euarenal zones of 38 beaches (5 to 50 m long and 1 to 10 m wide) in 16 lakes of different trophic status and morphometry (Masurian Lakeland, Poland). Porosity has no impact on psammon rotifer numbers as well as body-size of animals does not seem to play a significant role in species preference to different size classes of sand grains. However, the significant correlations were found between the rotifer numbers and the share of grain size fraction 0.25 - 1.00 mm (positive) and the share of the largest (i.e. > 1 mm) fraction (negative). The psammobionts generally are more related to the grain size ffraction 0.5-1.0 mm than the psammoxenes and psammophiles. Although particular rotifer species prefer different grain size fractions, bdelloids arre the only grroup of Rotifera preferring the smallest (<0.125 mm) grain fraction.

16

Rotifera of lake psammon : community structure versus trophic state of lake waters

Ejsmont-Karabin J.

Polish Journal of Ecology

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2003

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Vol. 51, nr 1

5-35

EN

Rotifer communities inhabiting wet sands of lake beaches are dependent in their functioning on permanent input of organic matter from neighbouring sites. The aim of the study is to test the hypothesis that trophic state of lake waters may influence densities and structure of psammon communities of Rotifera. Studies were carried out in hydro-, hygro- and euarenal of 44 beaches in 18 lakes of different trophy in summer 1999 (since 2 till 17 July) and 38 beaches in 16 lakes in spring 2000 (since 10 till 23 May). Psammon was sampled always between 10 a.m. and 2 p.m. at similar weather conditions (no shadow, rains and strong winds). Intersitial waters were mostly alkaline and contained less oxygen than lake ones and oxygen concentrations decreased upwar water line. Very high variability of phosphate P content made differences between trophic groups of lakes not significant. Similarly, concentrations of P total were more or less similar in all studied trophic groups of lakes. Total nitrogen values were increasing from meso-eutrophic to hypertrophic lakes in spring, whereas this trend was not observed in summer. Chlorophyll a concentrations were similar in meso-, meso-eu- and eutrophic and markedly higher in hypertrophic lakes. In general, some tendency to increasing values of chemical parameters with increasing trophy may be seen if their ranking list is compared. Rotifers were present in all studied stations. In total, 110 species (i.e. ca. 26% of all records of rotifer species in Poland) were found with 22 species occurring exclusively in psammon. Three species new in rotifer fauna of Poland were discovered - Cephalodella psammophila, Collotheca wiszniewski and Euchlanis dapidula. Generally all trophic groups of lakes were relatively similar as regards species structure of rotifer communities with rotifers of the genus Lecane playing most important role. The index of Percentage Similarity of Community calculated for randomly chosen 30 pairs of particular beaches of different lakes was in both cases almost identical. Species of high frequency constituted the owerwhelming majority of individuals forming rotifer communities of all beaches. Taxons met in 1 to 5 lakes decided on faunistic originality of the communities. Some tendency was observed for higher diversity of psammon rotifer communities in mesotrophic and eutrophic lakes. The lowest values of diversity index occurred mostly in hypertrophic lakes. Psammobionts constituted only 20% and psammoxens 10% of the community abundance in all lakes and all zones of the beaches, whereas psammophilic rotifers decidedly dominated (70%). Rotifer abundance was relatively similar in eu- and hypertrophic lakes and markedly higher in mesotrophic and lower in meso-eutrophic lakes. However, due to high fluctuations of the values noted in particular beaches the differences were not significant in any of the possible configurations of compared data. Monogononta played much more important role in rotifer densities than bdelloids. The hypothesis on advantageous influence of high trophy of lake waters on abundance of psammon communities of Rotifera cannot be supported by results of this work. In lakes of moderate trophy (from meso- to eutrophy) the amount of nutrients and chlorophyll does not seem to influence psammon communities. In hypertrophic lakes this impact is observed, but it seems to be rather unfavourable for psammon rotifers. The communities in hypertrophic lakes are poorer in species, less diversified and less original. The group of animals developing well in this group of lakes are bdelloids. Species composition and community structure of psammon rotifers seem to be rather determined by many different factors, lake trophy being only one of them and probably not the main one.

17

Is sandy beach of the lake an ecotone? Psammon rotifera in a mesotrophic Lake Kuc (Masurian Lakeland, Northern Poland)

Ejsmont-Karabin J.

Polish Journal of Ecology

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2003

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Vol. 51, nr 2

219-224

EN

Is inshore, 2-cm layer of wet sand an ecotone? An attempt of this study is to answer the question by analysing characteristic patterns of a structure of rotifer communities inhabiting the psammolitoral zone. Psammon was sampled from sandy shore of a mesotrophic Lake Kuc (Masurian Lakeland, Poland), weekly from May to November 1996 and on one occasion in May 1998. Despite of extremely unfavourable conditions of their abiotic habitat, psammon rotifers of Lake Kuc were reaching occasionally extremely high densities. Seasonal dynamics of numbers and structure of psammon rotifer communities reflected variable character of their habitat. A course of the changes was similar in less variable higropsammon and extremely variable eupsammon. Patterns formed in psammolittoral - when illustrated with qualitative and quantitative features of psammon rotifer communities - fit definitions of an ecosystem, an ecotone, a part of a land/water ecotone, a microlayer in the ecosystem or a specific boundary zone in the lake ecosystem.

18

Wrotki (Rotifera) planktonowe w zapadlisku na rzece Łąkawce (Bojszowy - Jedlina)

Bielańska-Grajner I., Niesler A.

Archiwum Ochrony Środowiska

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2002

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Vol. 28, no. 4

81-88

PL

W okresie od marca do listopada 2000 roku badano wrotki planktonowe w zapadlisku Bojszowy -Jedlina. Stwierdzono bogatą faunę Rotifera w tym zbiorniku. Wśród 71 taksonów występował nowy dla Górnego Śląska gatunek Erignatha clastopis (Gosse). Skład jakościowy zgrupowania wrotków w tym zapadlisku różnił się od składu wrotków w innych badanych zapadliskach. Struktura dominacji i stałości zgrupowania wskazywała na zrównoważony charakter pomimo oznak wysokiej trofii.

EN

From March to November 2000 planctonic Rotifera of the collapse pond Bojszowy - Jedlina were studied. Rich fauna of Rotifera (71 taxons) was recorded. One new for Silesia Region species Erignatfia clas-topis (Gosse) was found. The qualitative composition of the Rotifera community in that pond differed from other investigated collapse ponds. In spite of high eutrophy domination and constance structure indicated staid character of the Rotifera community in the Bojszowy - Jedlina pond.

19

Zmiany w sestonowych zespołach wrotków występujących w potoku Ślepiotka poniżej spływu wód ze stawu śródleśnego

Niesler A.

Archiwum Ochrony Środowiska

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2001

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Vol. 27, no. 4

129-141

PL

W okresie od marca do listopada 1999 r. badano zespoły Rotifera w potoku Ślepiotka, zanieczyszczonym ściekami bytowo-komunalnymi. Badano również faunę wrotków małego stawu śródleśnego, którego wody odprowadzane byty do potoku. Dzięki dokładnej analizie ilościowej oraz jakościowej stwierdzono, ze dopływ wody ze stawu spowodował trwały wzrost bogactwa gatunkowego, zagęszczenia oraz stabilności w zespołach wrotków w potoku Ślepiotka poniżej miejsca dopływu. Wyniki analiz fizyko-chemicznych wody potwierdziły dane biologiczne o pozytywnym wpływie wód stawu na faunę i jakość wody w potoku.

EN

The studies concerned qualitative and quantitative analysis of seston Rotifera communities of Slepiotka stream polluted with communal sewages. The samples were also taken from the small, inforest pond confluence with the stream. The studies were carried out from March to November 1999. The water from the pond, which flew down into the stream, had a good influence on the Rotifera communities living there. The stable increase in species diversity, abundance and stability of Rotifera communities of Slepiotka stream below the inflow was recorded. The physic-chemical analysis confirmed the favorable influence of the pond on Slepiotka stream water quality.