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1

Eutrophication in the southern Baltic Sea between 1989-1998

100%
Lysiak-Pastuszak E., Niemkiewicz N. E., Niemkiewicz E., Dragas D. N., Dragas N.
|
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.
2

Phytoplankton based biomonitoring on Hungarian upper-Tisa

100%
Imre A.
|
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
3

Effect of different light conditions on cyanobacteria and algal communities in Tatra Mts stream (Pland)

86%
Kawecka B.
Oceanological and Hydrobiological Studies
|
2003
|
issue 2
3-14
EN
Different light conditions at the open and shaded sites caused by marginal vegetation affected the structure of Cyanobacteria and algae communities, but had no effect on chlorophyll a content. In the open area Hydrurus foetidus (Villars) Trevisan, Homoeothrix janthina (Bornet et Flahault) Starmach, and diatoms (mainly Achnanthes minutissima Kutz. together with A. biasolettiana Grun. and species from the Gomphonema genus ) were the most numerous. In shadow the abundance of Hydrurus foetidus drastically decreased, whereas the diatom biomass index, Achnanthes minutissima and A. biasolettiana showed a tendency to reduce their number. On the contrary, the abundance of green algae and Cocconeis placentula Ehr. var. euglypta Ehr. increased. Chlorophyll a contents of both sites obtaining the highest values in summer - autumn and the lowest in the winter - spring seasons.
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