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Functioning of the Lake Rusałka ecosystem in Poznań (western Poland)

Gołdyn R., Szeląg-Wasielewska E., Kowalczewska-Madura K., Dondajewska R., Budzyńska A., Podsiadłowski S., Domek P., Romanowicz-Brzozowska W.

Oceanological and Hydrobiological Studies

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2010

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Vol. 39, No.3

65-80

EN

Lake Rusałka is a shallow, artificial, strongly eutrophic reservoir. Thermal stratification is weak and comprises only about 8% of the bottom surface. In summer, the epilimnion is oversaturated with oxygen due to intensive phytoplankton growth (chlorophyll a up to 80.2 μg l^-1), while conditions in the hypolimnion are anaerobic. The high concentration of ammonium nitrogen and low N:P ratio stimulated intense growth of cyanobacteria in the period from June to November. The domination of rotifers in the metazooplankton and low diversity and biomass of benthic macroinvertebrates was the cause of low top-down pressure of these organisms on the phytoplankton. The most advantageous restoration measures were identified to improve water quality and make the recreational use of the lake possible.

2

Relationship between Cyanobacterial bloom composition and anatoxin-a and microcystin occurrence in the eutrophic dam reservoir (SE Poland)

Pawlik-Skowrońska B., Skowroński T., Pirszel J., Adamczyk A.

Polish Journal of Ecology

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2004

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Vol. 52, nr 4

479-490

EN

Long-lasting cyanobacterial blooms were observed over summer periods 2001-2003 in the highly eutrophic dam reservoir (Zemborzycki Reservoir near Lublin, SE Poland) loaded with nitrogen and phosphorus by the river Bystrzyca. Chloriphyll a content and water transparence reached in summer periods 2002-2003 average values 115-129 [mi]g l^-1 and 0.5 m, respectively. The blooms consisted of eight taxa of Cyanobacteria occurring in different proportions: Aphanizomenon flos-aquae, Anabaena circinalis, Anabaena spiroides, Anabaena flos-aquae, Planktothrix agardhii, Microcystis aeruginosa, Microcystis viridis, Microcystis wesenbergii. At decreased average water temperature and increased concentration of dissolved ammonium-nitrogen in summer 2003, compared with two earlier years, a replacement of dominant Aph. flos-aquae to P. agardhii was observed. The total abundance of potential microcystin producers was positively correlated with the content of these hepatotoxins in the reservoir water. First time in Poland, mass occurrence of Anabaena strains producing anatoxin-a was observed. Anatoxin-a concentration in the reservoir water was positively correlated with total abundance of 3 taxa of Anabaena. It was no such correlation with Aph. flos-aquae.

3

Water blooms - what causes them?

Eloranta P.

Oceanological Studies

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1998

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Vol. 27, No. 1

15-19

EN

Water blooms are usually connected with cyanoprokaryote or algal mass occurrence, however, some other phenomena may also cause an intensive water colour in lakes. Common and characteristic water bloom is often brought about by mass oc-currence of tree pollens, abundant occurrence of fungal spores or, at deeper water layers, besides algae also some green or red sulphur bacteria. The most characteristic blooming algae belong to cyanoprokaryotes, but this phenomenon can be also caused by other taxa e.g. green algae, euglenophytes and chloromonads.

4

Occurence of dominating species in the vegetative period in two chosen dam reservoirs of Southern Poland (Wisła-Czarne reservoir and Dobczyce reservoir)

Wilk-Woźniak E., Bucka H.

Oceanological Studies

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1998

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Vol. 27, No. 2

77-81

EN

The influence of temperature and pH of water on the development of chosen species of algae and cyanophytes (Cyanobacteria, Cyanoprocaryotes) causing water blooms in two dam reservoirs, was studied. Their mass development was observed in various seasons of the year. Each species preferred different environmental conditions. The dominating species of phyto-plankton varied in both reservoirs, only dinoflagellate Ceratium hirundinella being the exception.

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Microbiological processes taking place in Dobczyce reservoir during spring water bloom

Bednarz T., Starzecka A.

Oceanological Studies

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1998

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Vol. 27, No. 2

13-21

EN

In waters of Dobczyce reservoir, the organic carbon content, biomass of algae and bacteria, respiration of bacteria and respiration of aquatic organisms (measured by oxygen uptake), and energetic expenditures per unit of bacterial biomass ('costs of maintenance') at the beginning of spring water bloom (May, 1996) caused by Nitzschia palea (Kutz.) W. Sm. were greater than those in the second phase of bloom. However, photosynthesis of algae was greater in the second one. In the surface layer of bottom sediments, the greatest values of measured parameters were noted in the second phase of water bloom but the 'costs of maintenance' of bacteria reached maximum values one week after of water bloom break.

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Blooms of Cyanophyta in Siemianówka dam reservoir in the first years after filling

Grabowska M.

Oceanological Studies

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1998

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Vol. 27, No. 1

27-31

EN

The biomass and species composition of blue-green algae in a new lowland dam reservoir was analysed from 4th till 6th year after filling. In summer, the massive abundance biomass of blue-green algae (0.93 mg dm^3 on average, max. 6.92 mg dm^3), chiefly of the genera Aphanizomenon, Microcystis and Anabaena causes the high trophy level in the reservoir, de-creasing water quality and aesthetic values of the studied water body. The conditions, which favour the development of blue-green algae, are mainly the result of the natural traits of water in the peat-forest catchment basin.