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1

Preliminary results from the investigation of benthic diatoms from potential reference river sites in Ireland

100%
Ni_Chathain B., Harrington T. J., McCarthy J., Kelly-Quinn M., Bradley C., Baars J. R.
|
2004
|
issue 3
3-15
EN
Benthic diatom samples were collected from 45 potential reference river sites in Ireland. Diatom samples were also collected from 24 lowland eutrophic sites. The main objective for sampling the potential reference sites was to determine the type-specific biological typologies represented by these sites. The lowland sites were sampled as part of another project and are used here for comparative purposes. A larger number of taxa was identified from the reference sites (175 species) in comparison with the lowland sites. (71 species). Distinct differences in diatom distribution and diversity between the reference sites and the lowland sites were revealed by DCA analysis. DCA analysis also showed that the original typological classification of the reference sites was not reflected to any extent in the distribution of benthic diatoms between these sites. However, there was some differentiation between the reference river sites with respect to diatom distribution along axis 1 of the DCA ordination and this was strongly correlated with water conductivity.
2

The evaluation of water quality in the swelinia stream on the basis of diatom analysis

100%
Bogaczewicz-Adamczak B., Kozlarska I.
Oceanological Studies
|
1999
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vol. 28
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issue 1-2
59-71
EN
The Swelinia Stream is one of several streams discharging into the Gulf of Gdansk in the Sopot coastal zone. The stream is inhabited by a great variety of benthic diatom flora, among which freshwater alkaliphilous diatoms, typical of eutrophic waters, are predominant. The $-meso- and $/'-mesosaprobic diatoms typical of waters moderately polluted by organic matter prevail within the saprobic groups. Xenosaprobic diatoms occur only occasionally. Quantitative analysis of diatoms, classified according to their saprobic requirements into taxa sensitive, tolerant and resistant to organic pollution, has shown that the water quality is deteriorating downstream. Evidence for this was the absence of class I water in the stream's lower course; the usual quality level is class II, which may even drop to class III in the summer and autumn.
3

Diatoms as indicators of water pollution in the coast-al zone of the Gulf of Gda?sk (Southern Baltic Sea)

100%
Bogaczewicz-Adamczak B., Klosinska D., Zgrundo A.
Oceanological Studies
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2001
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vol. 30
|
issue 3-4
59-75
EN
The subject of the study was microphytobenthos in the sediments of the coastal zone of the Sopot sea-resort (the Gulf of Gdansk). Sediment samples were taken from 12 sites situated in the mouths of the streams and creeks and from the beach close to the sea, once a month from January to December 1998. The indicative groups of diatoms were the basis of the estimation of water quality, taking into consideration its salinity, trophic state and saprobity. The quality of water was classified according to Lange-Bertalot (1979). The results of the diatom studies indicate that the dominating groups were the oligo-halobous and mesohalobous taxa, chatacteristic of highly eutrophic waters. The most abundant groups were the resistant (poly-saprobic and '-mesosaprobic) and tolerant ($-mesosaprobic) diatoms, which are indicators of water quality class III in the coastal zone of the Sopot sea-resort.
4

Using benthic diatom communities and diatom indices to assess water pollution in the Puck Bay (Southern Baltic Sea) littoral zone

88%
Bogaczewicz-Adamczak B., Dziengo M.
Oceanological and Hydrobiological Studies
|
2003
|
issue 4
131-157
EN
The subject of the study were the benthic diatom communities of the Puck Bay littoral zone. Samples of the sediments were taken from sites situated near the sewage treatment plant at Swarzewo from June 1998 to May 1999. The analysis of the species composition and the relative percentages of the diatom indicative groups were used to evaluate water quality. The following ecological factors were taken into consideration: salinity, trophic status and saprobity. Following Lange?Bertalot (1979), water quality was classified based on a 5-degree scale of saprobity. It was correlated to the percentages of the sensitive, tolerant and resistant diatoms taxa and their reaction to organic matter content. The water quality evaluation was tested with the diatom indices using Omnidia 3 software. The results of the diatom studies indicate that the dominating groups were the oligohalobous and mesohalobous taxa, which are characteristic of eutrophic waters and contain biogenic compounds, mainly nitrogen and phosphorus. The most abundant groups in the saprobic spectrum were the resistant (-mesosaprobic, polysaprobic) and tolerant (-mesosaprobic, /-mesosaprobic) diatoms, which are indicators of water purity class II (III), and in summer, predominantly class III. The comparison of the results of diatom analysis of the Puck Bay microphytobenthos obtained with the Lange?Bertalot (1979) method and the those acquired with Omnidia 3 software demonstrates the possibility of applying it to evaluate environmental status and assess polluted brackish waters.
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