Phenotype diversity of the cyanoprokaryotic genus Cylindrospermopsis (Nostocales); review 2002

KOMÁREK, J. & KOMÁRKOVÁ, J.

Czech Phycology 3: 1-30, 2003  

The cyanobacterial/cyanoprokaryotic nostocalean planktic genus Cylindrospermopsis (type species = C. raciborskii) was originally described as Anabaena by WOŁOSZYŃSKA (1912), later included in the genus Anabaenopsis (terminal heterocytes) by ELENKIN (1923), and at last separated as a special genus by SEENAYYA & SUBBA RAJU (1972) in respect to special trichome morphology and a special strategy of trichome development. It has a pantropical distribution. Eight new species were described recently, mainly from tropical freshwater planktic habitats. C. raciborskii has tendency to invade intensely temperate zones, where...

Detection of cell wall structural polysaccharides by cellulase-gold and chitinase-gold complexes

NĚMCOVÁ, Y.

Czech Phycology 3: 31-36, 2003  

The rigid cell wall of Chlorella vulgaris (Trebouxiophyceae) is probably composed of chitin-like substance. Chitinase isolated from Streptomyces griseus is able to split covalent linkages on isolated microfibrils. On cross-sections of plastic embedded cell walls the covalent linkages are "masked" by the layer of amorphous polysaccharides. The presence of cellulose in the cell wall can not be excluded. It does not dominated the rigid part, but is probably part of almost amorphous cell wall constituents located in interfibrillar matrix. Inner polysaccharidal layer of Scenedesmus quadricauda (Chlorophyceae) cell wall is composed of cellulose....

Navicula citrus KRASSKE (Bacillariophyceae) in the Czech Republic

MARVAN, P., GERIŠ, R. & RAMEZANPOOR, Z.

Czech Phycology 3: 37-40, 2003  

Navicula citrus KRASSKE (1923), an extremely rare species of the Czech diatom flora, was up to now known from a few South Moravian localities (BÍLÝ 1945). Its recent findings, mainly in running waters, both in the River Morava Basin and the River Labe Basin, suggest the possibility of its just beginning expansion wave.

Algae and cyanoprokaryotic species from peat bogs, streams, ponds and aerial biotopes in the region of South Šumava Mts.

ŠEJNOHOVÁ, L., ŠKALOUD, P., NEUSTUPA, J., NOVÁKOVÁ, S., ŘEZÁČOVÁ, M. & OŠLEJŠKOVÁ, L.

Czech Phycology 3: 41-52, 2003  

This paper presents the algological floristic investigation of the South Šumava Mts. In the vicinity of the Lipno I. Reservoir. In total, 137 taxa were determined. The most interesting species found in Olšina pond were Crucigenia quadrata and Eutetramorus planctonicus; in Pláničský pond the centric diatom Aulacoseira crenulata and silica-scaled chrysophytes (Mallomonas caudata and Synura petersenii) dominated plankton community. An interesting filamentous green alga Draparnaldia mutabilis occurred in a small periodic stream near Pláničský pond. Coleochaete scutata grew epiphytically on submersed vegetation...

Algal and cyanoprokaryotic species from backwater of the Vltava river in core zone "Vltavský luh" in the Šumava National Park [in Czech]

ŠEJNOHOVÁ, L.

Czech Phycology 3: 53-69, 2003  

The locality "Vltavský luh" is situated in the upper reaches of the Vltava river in the vicinity of the Lipno I. Reservoir. Since the year 1989 this area has been incorporated into the core zone of Šumava National Park. This locality represents one of the last remnants of original alluvial ecosystems of upper Vltava river most of which have been flooded by the Lipno I reservoir in the year 1958. Investigated area consists of oligotrophic backwater and oxbow lakes. The samples were collected from diverse microbiotopes - plankton, water surface, perifyton, submersed wood, artificial substrate - microscopic slides, sediment, squeezed Sphagnum and ice....

Algae of peat bogs in Bohemian-Saxonian Switzerland [in Czech]

NOVÁKOVÁ, S.

Czech Phycology 3: 71-78, 2003  

Algal flora of seven small mires in the Czech part of Bohemian-Saxonian Switzerland and five mires in the German part was investigated. In total one hundred and eighteen species were identified. The diversity of algae considerably correlates with pH and it is also influenced by the conductivity.

Algal flora of running and standing waters in the nature park "Pod Štědrým" [in Czech]

KUČERA, P.

Czech Phycology 3: 79-86, 2003  

One hundred fifty four species have been found during the first investigation of algal flora in the nature park "Pod Štědrým" in western Bohemia. Seven localities, which were chosen regarding the representative composition of all possible water biotopes in the area, were investigated during the years 2000-2002. Selected parameters - pH, oxygen concentration and saturation and conductivity were measured at each locality. The highest species diversity has been found at the locality Přebudovský pond (88 species), the lowest at the Přebudov - spring locality (7 species). Some rare species of diatoms have been found in pure water of mountain streams - Diatoma...

Diurnal changes of phytoplankton vertical distribution in a shallow floodplain pool

KOČÁRKOVÁ, A., POULÍČKOVÁ, A. & LELKOVÁ, E.

Czech Phycology 3: 87-96, 2003  

The study focused on measurements of selected environmental variables and phytoplankton abundance in a shallow floodplain pool. Vertical gradients of temperature, pH, dissolved oxygen and nutrients and their diurnal changes were found although the depth of the pool was only 80 cm (or 140 cm). Diurnal changes in vertical distribution were observed in the case of Euglenophyta, Cryptophyta, and Chrysophyceae.

Fishpond trophic status assessment based on nutrients and bioindication I. Phytoplankton

POULÍČKOVÁ, A., KITNER, M., HAŠLER, P., PAKOSTOVÁ, A., KARABINOVÁ, H., KŘÍŽOVÁ, B. & KOPP, R.

Czech Phycology 3: 97-110, 2003  

Two-year-study of selected environmental variables, phytoplankton abundance, structure and species composition at 12 fishponds was used for the evaluation of their trophic state. Favourable conditions of Bouzov fishponds are probably influenced by their disposition in the landscape. On the contrary, fishponds near Hradec Králové are strongly endangered by rapid eutrophication. The negative development of fishponds can be mitigated only by rigorous management excluding intensive fish or duck production, recreation, and agriculture in the surrounding fields. Prevention of external and internal loading and forestation of wide surroundings can be recommended.

Fishpond trophic status assessment based on nutrients and bioindication II. Littoral diatom communities

POULÍČKOVÁ, A., KITNER, M., KARABINOVÁ, H., PAKOSTOVÁ, A. & KŘÍŽOVÁ, B.

Czech Phycology 3: 111-118, 2003  

Attached diatoms were sampled from artificial substrates. This paper deals with the use of littoral diatom communities in the assessment of the trophic status of several investigated fishponds. The results were compared with the assessments based on nutrients and phytoplankton. The distinction of different types of localities on the basis of littoral diatoms is possible, although it is more pronounced on the basis of nutrients and phytoplankton.

Vertical distribution of epiphytic algae on the mosses and their relation to moisture

POULÍČKOVÁ, A., NOVÁKOVÁ, J. & KRÁSOVÁ, P.

Czech Phycology 3: 119-124, 2003  

The basic aim of this study is to determine the vertical distribution of algae on the Sphagnum plants and their relation to moisture. At the most dry site, the number of algae is increasing with increasing depth. The highest number of algae in the upper part of Sphagnum plant was observed at the most wet places. Epiphytic algal communities on mosses are dominated by diatoms.

Morphological variability of natural populations of Aulacoseira granulata (EHR.) SIMONS (Bacillariophyceae)

POULÍČKOVÁ, A.

Czech Phycology 3: 125-140, 2003  

Measurements were carried out of cell height, valve diameter and cell number per filament during seasonal maxima of A. granulata for 24 hours at hourly intervals in the years of 1986-1988. Although, their cell length:width ratio corresponded to var. angustissima, the average width itself exceeded Hustedt´s figures (1930). Cell division in the populations was not synchronous. The cells had no tendency to maintain a constant volume - wider filaments contained longer cells. The populations differed in average valve diameter and cell heigh. The presumptive reasons of these differences were discussed.

Ecological and physiological characteristics of snow algae from Czech and Slovak mountains

STIBAL, M.

Czech Phycology 3: 141-152, 2003  

Algal communities growing in melting snow represent an interesting example of organisms living in extreme conditions. The aim of this work was to study ecological and physiological demands of algae from Czech and Slovak mountains´ snowfields in situ and in culture. During the seasons 2000-2002 algae were sampled, transferred to laboratory, examinated, determined and four strains were isolated - Chloromonas nivalis, Chlorella vulgaris, Stichococcus bacillaris and Xanthonema hormidioides. Crossed gradients of temperature and light were used to learn about their ecophysiological limitations. The species Chloromonas nivalis expectedly appeared...

Competition for light among summer planktonic species

HAŠLER, P. & POULÍČKOVÁ, A.

Czech Phycology 3: 153-159, 2003  

The presented study aims to verify the hypothesis that Planktothrix agardhii, similarly to diatoms, can tolerate low light conditions; thus the changes in species composition of cyanobacterial blooms can be explained by light limitation. Its ability to occupy dominant position in the mixture with other planktonic species under low light conditions has been verified by experiments.

Aerial algae on spruce needles in the Krušné hory Mts, Czech Republic

NEUSTUPA, J. & ALBRECHTOVÁ, J.

Czech Phycology 3: 161-167, 2003  

The aerial algal growths on spruce needles in two localities located in the western and central parts of the Krušné hory Mts, which were characterized by different levels of damage caused by environmental pollution, were investigated. In total four species of green algae were encountered in algal growths (Apatococcus lobatus (CHODAT) PETERSEN, Pseudococcomyxa sp., Chlorella angusto-ellipsoidea HANAGATA, KARUBE & CHIHARA, Choricystis minor (SKUJA) FOTT). In the western locality nearby Přebuz, where the phenomenon of "new forest decline" expressed by enhanced needle yellowing and shedding has been observed since 1999,...

Phytoplankton communities in the drinking water reservoir of Znojmo

GERIŠ, R.

Czech Phycology 3: 169-176, 2003  

The reservoir was built in 1966 for drinking water supply, power generation, and irrigation. It is characterized by a very short retention time, narrow river-like shape, low average and maximum depths and high total phosphorus loading. Its catchment is large and strongly influenced by human activities. The composition of phytoplankton, zooplankton, chlorofyl-a concentration and chemical variables were analyzed monthly in the main vegetation seasons 1999-2002. The composition of phytoplankton assemblages is influenced both by high trophic status and extreme technical parameters of the reservoir. Diatoms prevailin spring, green algae and diatom Fragilaria...

Calcareous periphyton assemblages of the northern part of Florida Everglades

VYMAZAL, J.

Czech Phycology 3: 177-180, 2003  

Kalcifikovaná nárostová společenstva jsou běžnou součástí řasové flóry floridských Everglades. Výskyt kalcifikovaných nárostů je ovlivněn především kvalitou vody (zejména koncentrací fosforu) a hydrologickými poměry. Nejčastěji se vyskytují v oblastech, které nejsou zasaženy přísunem živin z přilehlé zemědělské oblasti, tj. v oblastech s koncentrací celkového fosforu < 10 mg.l-1 v tzv. "slough", což jsou oblasti, které prakticky nikdy nevysychají. Sušina těchto nárostů dosahuje hodnot >3000 g m-2, což je způsobeno vysokou koncentrací vápníku v sušině (až 30%). Tím je ovlivněn i obsah popelovin v sušině, který je většinou > 50%, ale často bývá...

Nonlinear regression as a tool for an algal bioassay data treatment

KOČÍ, V. & BURKHART, J.

Czech Phycology 3: 181-183, 2003  

This article deals with statistical treatment of data obtained from algal bioassays. The main interest is focused on nonlinear regression, which is recommended as a good tool for estimate of EC50 values based on dose-response curve.

Advantages of algal toxicity bioassays for SPMD evaluation

MLEJNEK, M., KOČÍ, V., KOCHÁNKOVÁ, L. & OCELKA, T.

Czech Phycology 3: 185-193, 2003  

This paper focuses on monitoring of persistent organics pollutants (POPs) in the aquatic environment. POPs usually occur in trace concentrations, which are difficult to determine with conventional analytical methods. A passive sampling method, using semipermeable membrane devices (SPMDs), in combination with algal toxicity bioassay and bacterial bioluminescence assay were used. Scenedesmus subspicatus is sensitive to variable concentrations of persistent organic pollutants contained in sample. An advantage of algal assay is low sensitivity to impurities originating from commercial triolen used for filling the SPMDs.

Analyses of microcystins in the biomass of Pseudanabaena limnetica collected in Znojmo reservoir

MARŠÁLEK, B., BLÁHA, L. & BABICA, P.

Czech Phycology 3: 195-197, 2003