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1

Spatial distribution of chlorococcalean genera in the phytoseston of the we?na and nielba rivers

100%
Messyasz B.
Oceanological and Hydrobiological Studies
|
2003
|
issue 2
33-44
EN
The chlorococcalean flora from two crossed rivers during the summer period (from July to September 2001 and 2002) was examined. Phytoseston communities were collected from the We?na and Nielba rivers before and behind the cross-rivers as well as from the central place of the cross-rivers. Species belonging to 6 dominant genera: Scenedesmus, Pediastrum, Monoraphidium, Ankistrodesmus, Coelastrum and Tetraedron were found in both rivers. At most of the stations located along the We?na and Nielba rivers after their crossing a trend of increasing green algae species richness together with an increase in the total species number of cells was observed. Furthermore, it was found that the We?na river takes over some of the Nielba phytoseston species.
2

Seasonal changes of phytoplankton dominated by Cyanoprocaryota in Lake Laskownickie

100%
Messyasz B.
Oceanological Studies
|
1998
|
vol. 27
|
issue 1
33-37
EN
The studies on the changes in phytoplankton composition against a background of selected physico-chemical factors of water in Lake Laskownickie (near Wagrowiec, Poland) were carried out in spring-summer seasons of 1993 to 1995. The changes in the qualitative and quantitative composition of phytoplankton and dynamics of Cyanoprocaryota populations in the vegetation season were connected with high concentrations of the phytoplankton biomass (10-70 mg dm^3), chlorophyll a (18.7-195.7mug dm^3) and biogens (Tot. P 0.040-1.100 mg P dm^3; Tot. N 3.77-12.00 mg dm^3). The blooms of Cyanoprocaryota occured in this reservoir each year. They were dominated by species such as: Plankto-thrix agardhii (Gom.) Anagnostidis et Komarek, Limnothrix redekei (Van Goor) Meffert, Aphanizomenon issatschenkoi (Vsac) Prosk-Lavr, Pseudoanabaena limnetica (Lemm.) Kom.. During blooms, the changes of the composition of companion taxa were observed.
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