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1

The composition, abundance and distribution of dinoflagellates in the Gulf of Gdansk in the years 1992-1994

100%
Plinski M., Dobron K.
Oceanological Studies
|
1999
|
vol. 28
|
issue 1-2
41-49
EN
The quantitative and qualitative analysis of dinoflagellates from samples taken in the years from 1992 to 1994 in the Gulf of Gdansk has been done. The following species was identified: Hetero-capsa triquetra, Dinophysis norvegica, D. acuminata, Peridinium balticum, P. aciculiferum, P. pellucidum, P. curvipes, P. brevipes, Peridiniella catenata, Gonyaulax triacanta, Prorocentrum micans. The highest quantity of dinoflagellates was observed in May 1994.
2

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.
3

Comparison of saprobical analyses using plankton in the tributaries of the upper Tisa, Hungary In 2001-2002

100%
Imre A.
Oceanological and Hydrobiological Studies
|
2004
|
issue 2
63-75
EN
Saprobiological investigation using plankton is a part of everyday monitoring practice for determination of water quality in Hungary. However there is an important question: Is this way of using plankton (mainly phytoplankton) good enough and bringing enough information? We can hear, this method is too old and its result are not collateral with different chemical way?s describing saprobity. Another problem of this biological method is being so labor-intensive, demanding a well qualified knowledge on algology and protozoology. To solve these problems and questions we examined saprobiological and the chemical results, describing water quality of tributaries of Hungarian Upper-Tisa, in years 2001-2002. Summarizing results of our investigations, we can say: biological (saprobiological) method of analyses for saprobity is not worse than chemical ways and can give us more information about ecological parameters.
4

Phytoplankton characterisitcs for different types of Estonian rivers

100%
Piirsoo K., Pall P., Viik M.
Oceanological and Hydrobiological Studies
|
2004
|
issue 1
23-35
EN
The following phytoplankton characteristics and parameters were studied for different ecological types of river reaches: biomass (PB, mg l-1); abundance (PA, 106 cells l-1); number of taxa per quantitative sample (PT); Nygaard's phytoplankton compound quotient (PCQ); phytoplankton dominants (PD). The quantitative characteristics of phytoplankton (species richness, abundance, biomass and PCQ) revealed an increasing trend from small to large upstream catchment areas, but did not respond to different river bedrock or flow velocity. Additionally, PCQ was the highest for the class of 'good' water quality. The phytoplankton dominants were not suitable for typology in the case of small streams where species composition was heterogeneous, without a well-developed phytoplankton community.
5

Phytoplankton of humo-eutrophic Lake Plotycze (Sobiborski Landscape Park, Eastern Poland)

100%
Peczula W., Zykubek A.
Oceanological Studies
|
1998
|
vol. 27
|
issue 2
45-50
EN
Phytoplankton structure (abundance, taxonomical structure, species diversity) as well as physico-chemical factors (tem-perature, pH, electrolytic conductivity, oxygen concentration) were observed in a natural, shallow, small lake. The comparison of three zones within the studied lake showed distinct trophic differentiation. The biodiversity indices, which were used in this analysis, appeared to be useful in determining the lake functions.
6

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.
7

Phytoplankton as eutrophication indicator in the Gulf of Gdansk water

100%
Niemkiewicz E., Wrzolek L.
Oceanological Studies
|
1998
|
vol. 27
|
issue 4
77-92
EN
The present survey presents the results of phytoplankton number and biomass measurements and also chlorophyll a contents in marine water. The investigations were started in autumn1994 and continued in summer 1995 along six coastal profiles in the Gulf of Gda?sk. The paper provides the current condition of the phytoplankton - the first link in the food chain in a water body biocenosis. The research confirmed also the early 80s findings as to the changed structure of phytoplankton domination where flagellates dominated in terms of number and dinoflagellates - in terms of biomass.
8

Phytoplankton of the Morava River in the Czech Republic and Slovakia: past and present

100%
Marvan P., Hetesa J., Hindak F., Hindakova A.
Oceanological and Hydrobiological Studies
|
2004
|
issue 4
41-60
EN
The amount of industrial waste released into the Morava River has decreased substantially since the late 1950s. This has led to a marked increase in phytoplankton abundance and species diversity. In the past, the Dyje River, a main right-side tributary of the Morava, served as a major source of planktonic algae for the lowermost stretch of the Morava River. At present, production and biological processes in the Nove Mlyny reservoirs significantly influence water quality. The quantity of phytoplankton has decreased but during hot summer periods the floating biomass of bloom forming Cyanophyta has increased significantly. The increase of colonial cyanophytes is an undesirable incidental phenomenon associated with the improvement of water quality in terms of allochthonous organic pollution. This was also promoted by the damming of the Dyje River in its lower floodplain area some fifteen years ago. Observations from 2002 indicate that a bloom of cyanophytes could soon also affect the middle stretch of the Morava. The lower stretch of the Morava supports a species-rich community of planktonic algae and diatoms, but above all, green flagellated and coccal algae. The Morava represents an important source of algal inoculums for the Danube and it contributes to the species diversity at the point where it enters the Pannonian Lowland. In this stretch of the river 25 genera with 58 species of cyanophytes and 181 genera with 634 species and infraspecific taxa of different groups of algae have been identified. Phytoplankton abundance has increased several times in comparison to the late 1950s. The highest values measured in 2002 were close to 100,000 cells per ml, and the chlorophyll?alpha concentration was 100 mug/l.
9

Changes in the phytoseston of a river-lake system in Drawienski National Park

100%
Goldyn R., Szelag-Wasielewska E.
Oceanological and Hydrobiological Studies
|
2004
|
issue 2
17-28
EN
The phytoseston in the Plociczna River originated mainly from lakes situated in its water course. It was more abundant and diverse in spring than in summer, which was related to differences in water discharge. The phytoseston abundance between the stations at the inlets and outlets of the successive lakes increased 9.7, 1.9 and decreased 1.4 times, respectively. A gradual reduction in the abundance of organisms was also noted at the outlets of successive lakes, which indicated a decrease in the trophic status of the water. The abundance of phytoseston between the outlets and inlets to the subsequent lakes (river stretch) decreased considerably. Disturbances in the river continuum system caused by the lakes situated in the river course resulted in the acceleration of potamoplankton succession.
10

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.
11

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

100%
Wilk_Wozniak E., Bucka H.
Oceanological Studies
|
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.
12

The effect of siderophores and cooper on the rate of photosynthesis in unicellular algae

100%
Kossakowska A., Falkowski L.
Oceanological Studies
|
1994
|
issue 67/10
7-13
EN
The paper presents the results of studies on the influence of cooper, in the presence of siderophores, on the rate of carbon-14 incorporation into the algae cells.Axenic strains of unicellular algae:Scenedesmus microspina (Martens and Pankow), Anacystis nidulans (Nagelli) and natural populations of phytoplankton from the Gulf of Gdansk have been tested.
13

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.
14

Formation of phytoplankton in the first years of existence of the water supplying reservoir (southern Poland) against the background of increased eutrophication process

88%
Pajak G.
Oceanological and Hydrobiological Studies
|
2003
|
issue 4
5-77
EN
The aim of the investigations was a recognition of the complex of physico-chemical parameters affecting the dynamics and structure of phytoplankton. The taxonomical composition, abundance and biomass of nano- and phytoplankton has been determined. In the development of the reservoir four stages were distinguished. In stage I of the reservoir filling, the temperature and pH value of water as well as the level of PO4-P, had a decisive influence on the process of phytoplankton formation. A sudden change in the damming ordinate in stage II of the reservoir studies contributed to the development of nanoplanktonic diatoms, and the refilling of the reservoir ( stage III) caused an abundant development of green algae. After the reservoir had been filled (stage IV) the planktonic forms of cryptophytes group dominated. The initial dominance of taxons had no influence on its structure after a four-year searching. A very similar pattern of proportionally altering phytoplankton communities in the investigated basins (BM and BD) suggests that both the depth and availability of nutrient compounds were not the limiting factors in the initial period of functioning of the Dobczyce Reservoir.
15

Phytoplankton and zooplankton in the zones of rushes and submerged vegetation of Lake Lubaskie Duze

88%
Kuczynska_ K. N., Meyssyasz B.
Oceanological Studies
|
1998
|
vol. 27
|
issue 2
23-27
EN
The examined Lake Lubaskie Duze covering the area of 41.5 ha is a dimictic lake a mean depth of 12 m (max. depth 16 m). The systematic observations of phyto- and zooplankton changes together with the selected physico-chemical parameters of water which were carried out for this lake during 1991-1996 showed its mesotrophic character declining towards eutrophy . In 1996, the research was expanded to the analyses of the plankton dynamics in the zones of rushes and submerged vegetation. The purpose of this research was to examine qualitative and quantitative changes of plankton inhabiting various habitats. The samples were collected along the transect starting from rushes to the area of open water (pelagic zone). The sampling was performe at four stations: station 1 - zone of rushes, community of reed and cattail; station 2 - zone of open water area between stations 1 and 3; station 3 - zone of submerged vegetation, community of hornwort; station 4 - open water (pelagic zone). Taking into consideration the spatial distribution of plankton, the differences in the taxonomic groups inhabiting the zones along the transect were noted. In the zone of submerged vegetation, the higher species diversity and greater numbers of specimens were observed than in the zone of rushes.
16

Eutrophication in the southern Baltic Sea between 1989-1998

88%
Lysiak-Pastuszak E., Niemkiewicz N. E., Niemkiewicz E., Dragas D. N., Dragas N.
Oceanological Studies
|
2000
|
vol. 29
|
issue 4
27-41
EN
In the Baltic Sea the process of eutrophication - increasing productivity - has became accelerated in the recent century and presently it stands the major ecological problem of this sea. One of the characteristic symptoms of eutrophication is an increase of nutrient reserves in the euphotic layer during winter accumulation, providing favourable feeding conditions for the intensive development of spring phytoplankton population, the main source of organic material in the marine ecosystem. In this study an attempt was undertaken to correlate the variability of biological parameters (phyto-plankton biomass and chlorophyll concentration) determined between 1989-1998 with chemical (nutrient concentrations in winter, oxygen saturation) and physical ones (water transparency). The parameters under scrutiny are measured regularly in water of the Bornholm Deep, SE Gotland Deep and Gdansk Deep within the framework of the Baltic Sea monitoring programme. The mean annual biomass of phytoplankton and mean annual chlorophyll content in the surface (0-10 m) layer were related to winter concentrations of phosphate, nitrate and silicate. Water saturation with oxygen during vegetation season was analysed in relation to biological parameters and the same analysis was carried out for water transparency. Statistically significant correlations between the analysed determinands were found in water of the Gdansk Deep and SE Gotland Basin but not for the Bornholm Deep.
17

Phytoplankton based biomonitoring on Hungarian upper-Tisa

88%
Imre A.
Oceanological and Hydrobiological Studies
|
2004
|
issue 2
57-62
EN
Phytoplankton based biomonitoring in Hungary actually includes its numbers, also saprobiological investigation and measurement of chlorophyll-a. Saprobiological analyses showed us 199 different described planktonic forms (including Ciliata, Bacteria, Flagellata apochromatica and Mycophyta), which were dominated usually by Diatoms. Other periods are characterised by equalized domination between phylla of algae. The highest numbers of algae were registered usually in summer season and the chlorophyll-a?s level showed explicit correlation with it. Classification on the content of chlorophyll-a must be corrected by a seasonal factor, according to changeable light conditions. Saprobity at every sampling places in all sampling time was showed the second or the third class of water quality, with only one exception at Zahony
18

The smallest phototrophic organisms in a lowland river: comparison with other components of the phytoseston

88%
Szelag-Wasielewska E.
|
EN
The phytoseston of the Warta, a polluted eutrophic river in western Poland, was studied from spring to autumn 2003. The focus of the study was autotrophic picoplankton (APP). APP abundance fluctuated from 1.3?106 to 1.05?108cells L1 and was characterized by a maximum in late July. APP biomass was low, ranging from 0.5 to 19.7 mug C L1. Both cyanobacteria and eukaryotic organisms were found within the picoplankton. The picocyanobacterial community was often dominated by colonial forms, mostly Aphanocapsa spp. and Cyanogranis ferruginea (Wawrik) Hindak. Eukaryotic picoplankton included chlorophytes of the genera Chlorella, Choricystis, and Pseudodictyosphaerium jurisii (Hind?k) Hindak. Among the phytoplankton larger than 2 mum, the most abundant species were diatoms and chlorophytes, except in late August, when filamentous cyanobacteria dominated. The contribution of APP to the total phytoplankton biomass was usually below 1%, and the mean (0.6%) was close to the lower limit of values found in lakes.
19

Monitoring phytoplankton populations and water quality parameters in estuarine rivers of Chesapeake Bay, U.S.A.

88%
Marshall H. G., Burchard L.
Oceanological and Hydrobiological Studies
|
2004
|
issue 1
55-64
EN
A 16-year monitoring program (1986-2002) determined significant long-term trends among phytoplankton populations and water quality parameters in the tidal waters of several rivers (Rappahannock, James, York, Pamunkey) located in Virginia. There were increasing trends in total phytoplankton abundance and biomass, which included the increasing biomass of diatoms, cyanoprokaryotes, cryptomonads, and chlorophytes in each river. There were also trends of increasing downstream salinity, and decreasing concentrations of TN and DIN. The TP and DIP showed none, or variable trends, except in the York River where both concentrations were increasing. General observations also indicated the common occurrence of dinoflagellates and cyanoprokaryotes blooms in several of these rivers.
20

Structure and function of marine ecosystem in the Gdansk Basin on the basis of studies performed in 1987

75%
Piechura J., Renk H., Stopinski M., Witek B.
Oceanological Studies
|
1993
|
issue 64/9
5-125
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