Wyniki wyszukiwania

1

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

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2012

|

tom 60

|

nr 2

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 (TSISD ) and chlorophyll a content (TSICHL ) 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 (TSIROT) were found: (1) rotifer numbers (N, ind. L-1): TSIROT1 = 5.38 Ln(N) + 19.28; (2) total biomass of rotifer community (B, mg w.wt. L-1): TSIROT2 = 5.63 Ln(B) + 64.47; (3) percentage of bacterivores in total rotifer numbers (BAC, %): TSIROT3 = 0.23 BAC+ 44.30; (4) ratio of biomass to numbers (B:N, mg w.wt. ind.-1): TSIROT4 = 3.85 (B:N)-0.318; (5) percentage of the tecta form in the population of Keratella cochlearis (TECTA, %): TSIROT5 = 0.198 TECTA + 48.8 for dimictic lakes and TSIROT5 = 0.144 TECTA + 54.8 for polymictic ones; (6) contribution of species which indicate high trophic state in the indicatory group’s numbers (IHT, %): TSIROT6 = 0.203 IHT + 40.0. It was assumed that the lakes with a TSIROT under 45 are mesotrophic, those with a TSIROT value of 45–55 are meso-eutrophic, 55–65 - eutrophic and those with a TSIROT above 65 - hypertrophic. The formulas may be useful in preparing similar indices for lakes in central and northern Europe.

2

II miedzynarodowa konferencja na temat limnologii zbiornikow zaporowych i jakosci wod [Czeskie Budziejowice, 9-14 VIII 1992 r.]

100%

Ejsmont-Karabin J.

Wiadomości Ekologiczne

|

1993

|

tom 39

|

nr 1

60-62

3

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)?

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2011

|

tom 59

|

nr 1

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°17.8’– 52°23.3N, 18°14.4’–18°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.

4

Miedzynarodowe warsztaty na temat poczucia miejsca na terenach pojezierzy [Stacja Terenowa nad Jeziorem Pstragow, Wisconsin, USA, 17 - 19 X 2002 r.]

100%

Ejsmont-Karabin J.

Wiadomości Ekologiczne

|

2003

|

tom 49

|

nr 1

88-91

5

VIII miedzynarodowe sympozjum na temat wrotkow [Collegeville, Minesota, USA, 22-27 VI 1997 r.]

100%

Ejsmont-Karabin J.

Wiadomości Ekologiczne

|

1998

|

tom 44

|

nr 1

72-74

6

Vertical microzonation of psammon rotifers [Rotifera] in the psammolittoral habitat of an eutrophic lake

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2008

|

tom 56

|

nr 2

351-357

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

7

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

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2008

|

tom 56

|

nr 4

717-722

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.

8

Long-term changes in the abundance and structure of the community of planktonic Rotifera in a humic lake, as a result of liming

100%

Ejsmont-Karabin J.

Ekologia Polska

|

1996

|

tom 44

|

nr 1-2

39-51

9

Druga miedzynarodowa konferencja naukowa 'Ekosystemy jeziorne: procesy biologiczne, antropogeniczne przeksztalcenia, jakosc wod' [Minsk-Narocz, Bialorus, 22-26 IX 2003 r.]

100%

Ejsmont-Karabin J.

Wiadomości Ekologiczne

|

2004

|

tom 50

|

nr 1

67-69

10

Rotifer invasion? On appearance and abundance of tropical species in lakes of North-Eastern Poland

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2014

|

tom 62

|

nr 4

Trichocerca simoneae De Smet described in 1989 has since been found in tropical and subtropical areas, but was not recorded in Poland before World War II. A bibliography of Polish rotifers by Wiszniewski (1953), although very comprehensive, does not refer to T. simoneae. However, in the studies of plankton of the dystrophic lake, i.e. humic one with water rich in humic acids, acidic pH and brown coloured, carried out in the years 1998–2000, the species dominated. Here, studies in 39 small, inter-forest lakes of north-eastern Poland revealed T. simoneae in 15 of them, often at high densities, up to ca 6000 ind L-1. The possible reasons for this ‘invasion’ are: (1) zooplankton communities in dystrophic lakes are unsaturated with biotic interactions too weak to exclude invaders; CCA and RDA analyses showed that T. simoneae preferred habitats with low number of zooplankton species of low density and dystrophic lakes seem to offer such habitats; (2) long-term deposition of rotifer resting eggs is probably more successful in sediments decaying at low rates. The latter possibility seems to be confirmed by observed in the littoral zone of dystrophic lakes appearance from time to time, of rare, mostly tropical species of Rotifera (e.g., Lecane hornemnni, L. monostyla, L. sola).

11

Abundance and structure of rotifer community in a humic Lake Smolak twenty years after the experimental mineral fertilisation

100%

Ejsmont-Karabin J.

Archiwum Rybactwa Polskiego

|

1998

|

tom 06

|

nr 2

233-245

12

Miedzynarodowa konferencja poswiecona 100-leciu urodzin Profesora G. G. Winberga [1905-1987] - 'Ekologia wodna w zaraniu XXI wieku' [Sankt Petersburg, 3-7 X 2005 r.]

100%

Ejsmont-Karabin J.

Wiadomości Ekologiczne

|

2006

|

tom 52

|

nr 1

47-50

13

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

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2003

|

tom 51

|

nr 1

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). Interstitial waters were mostly alkaline and contained less oxygen than lake ones and oxygen concentrations decreased upward 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 tbr randomly chosen 30 pairs of particular beaches from the same lake and for beaches of different lakes was in both cases almost identical. Species of high frequency constituted the overwhelming 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 nad 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.

14

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

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2003

|

tom 51

|

nr 2

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.

15

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

100%

Ejsmont-Karabin J.

Polish Journal of Ecology

|

2004

|

tom 52

|

nr 3

The aim of the study was to 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-, hygro- 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 fraction 0.5–1.0 mm than the psammoxenes and psammophiles. Although particular rotifer species prefer different grain size fractions, bdelloids are the only group of Rotifera preferring the smallest (<0.125 mm) grain fraction.

16

V międzynarodowe sympozjum na temat wrotków ( Gargano, Włochy, 12-17 IX 1988 r.)

88%

Ejsmont-Karabin J.

Wiadomości Ekologiczne

|

1989

|

tom 35

|

nr 2

17

2. Sympozjum Europejskich Nauk o Wodach Slodkich [Tuluza, 8-12 VII 2001 r.]

75%

Ejsmont-Karabin J.

Wiadomości Ekologiczne

|

2002

|

tom 48

|

nr 1

58-60

18

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

63%

Ejsmont-Karabin J., Hutorowicz A.

Oceanological and Hydrobiological Studies

|

2011

|

tom 40

|

nr 4

19

Illustration of the eutrophication process: comparison of rotifers from Mikolajskie Lake in the years 1989-1990 and 1963-1964

63%

Ejsmont-Karabin J., Hillbricht-Ilkowska A.

Polskie Archiwum Hydrobiologii

|

1994

|

tom 41

|

nr 4

477-487

20

Densities, structure and the role of zooplankton in phosphorus cycling in limnetic and lotic parts of Zegrzynski Reservoir

63%

Ejsmont-Karabin J., Weglenska T.

Ekologia Polska

|

1989

|

tom 37

|

nr 3-4

Ograniczanie wyników

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

II miedzynarodowa konferencja na temat limnologii zbiornikow zaporowych i jakosci wod [Czeskie Budziejowice, 9-14 VIII 1992 r.]

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)?

Miedzynarodowe warsztaty na temat poczucia miejsca na terenach pojezierzy [Stacja Terenowa nad Jeziorem Pstragow, Wisconsin, USA, 17 - 19 X 2002 r.]

VIII miedzynarodowe sympozjum na temat wrotkow [Collegeville, Minesota, USA, 22-27 VI 1997 r.]

Vertical microzonation of psammon rotifers [Rotifera] in the psammolittoral habitat of an eutrophic lake

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

Long-term changes in the abundance and structure of the community of planktonic Rotifera in a humic lake, as a result of liming

Druga miedzynarodowa konferencja naukowa 'Ekosystemy jeziorne: procesy biologiczne, antropogeniczne przeksztalcenia, jakosc wod' [Minsk-Narocz, Bialorus, 22-26 IX 2003 r.]

Rotifer invasion? On appearance and abundance of tropical species in lakes of North-Eastern Poland

Abundance and structure of rotifer community in a humic Lake Smolak twenty years after the experimental mineral fertilisation

Miedzynarodowa konferencja poswiecona 100-leciu urodzin Profesora G. G. Winberga [1905-1987] - 'Ekologia wodna w zaraniu XXI wieku' [Sankt Petersburg, 3-7 X 2005 r.]

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

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

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

V międzynarodowe sympozjum na temat wrotków ( Gargano, Włochy, 12-17 IX 1988 r.)

2. Sympozjum Europejskich Nauk o Wodach Slodkich [Tuluza, 8-12 VII 2001 r.]

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

Illustration of the eutrophication process: comparison of rotifers from Mikolajskie Lake in the years 1989-1990 and 1963-1964

Densities, structure and the role of zooplankton in phosphorus cycling in limnetic and lotic parts of Zegrzynski Reservoir