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1

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

100%
Grabowska M.
Oceanological Studies
|
1998
|
vol. 27
|
issue 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.
2

Occurrence of blue-green algae in the phytoplankton of the Gulf of Gdansk in the years 1994-1997

100%
Witek B., Plinski M.
Oceanological Studies
|
1998
|
vol. 27
|
issue 3
77-82
EN
The development of the blue-green algae in the Gulf of Gdansk begins in May and lasts till October. To the stable compo-nents of the filamentous forms belong Aphanizomenon-flos aquae, Nodularia spumigena, Planktolynbya limnetica, Pseudanabaena limnetica and Planktothrix sp. The coccoid forms are represented by Snowella septentrionalis, S. lacustris, Merismopedia punctata, M. tenuissima, Woronichinia compacta, Rabdogloea linearis, Cyanodictyon imper,fectum, C.planctonicum. In the years 1992 and 1993 the openwater area of the Gulf of Gdansk was characterised by the summer (July) domination of two species of blue-green algae: Microcystis aeruginosa and Aphanizomenon flos-aquae. The presence of Nodularia spumigena was also noticed. In 1994, the extremely dense bloom of Nodularia spumigena occurred with the biomass increase to 130 mg?C? m^3. The intensity of this bloom could be linked to temperature which in summer 1994 was very high and reached over 22?C. In the years 1996 and 1997, temperature did not attained so high values and the intensity of blooms was lower.
3

Blue-green algae blooms in the Gulf of Gdansk and surrounding area

100%
Plinski M., Musial A., Ostrowski B.
Oceanological Studies
|
1998
|
vol. 27
|
issue 1
39-44
EN
The phenomenon of blue-green algae blooms in the Baltic and the surrounding freshwater bodies has been known since several years. Recently these blooms have increased. The negative effects of this phenomenon concern not only environ-ment but also pose epidemiological threats because some blue-green algae produce toxins. The presence of potential toxic blue-green algae species in the Gulf of Gda?sk as well in the whole southern Baltic has been noticed for almost hundred years. In the recent years, when water temperature reached more than 18?C, the rapid growth of Nodularia spumigena has been observed. In the year 1994, the huge bloom with toxic features of this species has been noticed. With less intensity such a bloom appeared also in 1996. Since several years Anabaena flos-aquae blooms in the Vistula Lagoon and Microcystis flos-aquae in many lakes in the Kashubian Lakeland.
4

Water temperature of the littoral zone during the domination of the blue-green algae Planktothrix agardhii and Limnothrix redeckei in the composition of phytoplankton in the polytrophic lake Jeziorak Maly

100%
Zebek E.
Oceanological Studies
|
1998
|
vol. 27
|
issue 1
53-59
EN
Studies were carried out on net phytoplankton of an urban Lake Jeziorak Maly, Mazurian Lakeland. Samples collected in 1996 showed domination of blue-green algae(67% of the total phytoplankton number). Limnothrix redeckei and Plankto-thrix agardhii were particularly abundant. The measurement of the water temperature during the mass occurrence of these species revealed, that Limnothrix redeckei dominated at 180C and Planktothrix agardhii at 200C.
5

Dynamics of blue-green algae development in Sulejow dam reservoir

100%
Galicka W., Lesiak T., Rakowska B.
Oceanological Studies
|
1998
|
vol. 27
|
issue 1
21-26
EN
Phytoplankton of Sulejow Reservoir was investigated in 1979-1993. Over that period, blue-green algae were usually a constant component of phytoplankton. Their percentage in the total phytoplankton biomass widely varied both from season to season and from year to year. Maximum values were noted in summer, although sometimes a shift of peak development toward spring or even winter was observed. The development was not uniform in the whole area of the reservoir; blue-green algae dominated in the middle and downstream, that is in the deepest parts of the reservoir. The main components of phytoplankton included Microcystis aeruginosa K?tz. and Aphanizomenon flos-aquae (L.) Ralfs.
6

Predictional model of biocenotic changes in offshore Baltic plankton due to temperature increase

100%
Plinski M., Zmijewska M. I., Sapota M., Witek B., Mudrak S.
Oceanological and Hydrobiological Studies
|
2003
|
issue 3
29-41
EN
Over the last 20 years, more and more reliable data concerning global climate change, mainly climate warming, have become available in the literature. Change such as this has also been documented in the Gulf of Gdansk. Climate change has an influence on aquatic ecosystems and especially their biocoenoses, and plankton is one of its most sensitive ecological fractions. Positive and negative statistical correlation in the exclusive relationship between the quantity of plankton groups and water temperature has been observed. When time was applied as a factor, only the annual increments of the blue-green algae correlation were statistically significant, and the regression equation calculated in this paper was applied to predict a rise in the population number of this algae in response to increasing temperature. It was not possible to perform this calculation with the other plankton components.
7

Effect of salinity, temperature and light on growth of Anabaena flos-aquae and Nostoc sp. div. (cyanobacteria, blue-green algae)

75%
Plinski M., Dziopa M.
|
EN
Two species of blue-green algae have been studied under laboratory conditions in several combinations of salinity (0, 8, 16, 24 PSU), light (20, 70, 120, 170 muE m^-2 s^-1) and temperature (20, 25, 30, 35 ?C). Temperature within the range of 30-35 ?C and light intensity of 170 mE m^-2 s^-1 were the optimum to achieve a maximum growth effect in the two species examined. Salinity as an environmental factor showed that these two tested species are fresh water in origin with some tolerance to increased salinity concentration. The best growth rate for Anabaena flos-aquae was stated in 0 PSU medium for all temperature and light conditions. For Nostoc sp. div. medium with 8 PSU was the optimum one.
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