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1

Water blooms - what causes them?

100%
Eloranta P.
|
1998
|
vol. 27
|
issue 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.
2

The vegetative period in two chosen dam reservoirs of Southern Poland (Wisla-Czarne reservoir and Dobczyce reservoir)

80%
Wilk_Wozniak E., Bucka H.
|
1998
|
vol. 27
|
issue 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.
3

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

80%
Grabowska M.
|
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.
4

Microbiological processes taking place in Dobczyce reservoir during spring water bloom

61%
Bednarz T., Starzecka T.
|
1998
|
vol. 27
|
issue 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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