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Land snails as indicators of soil humidity in Danubian woodland (SW Slovakia)

Cejka T., Hamerlik L.

Polish Journal of Ecology

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2009

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Vol. 57, nr 4

741-747

EN

Moisture along with available calcium content are the major environmental factors controlling species richness and composition of the terrestrial molluscan fauna. In the present study, we focused on snails in a floodplain forest and their response on humidity. We described the model of response and calculate the humidity optima of particular species if possible. Generalised linear model (GLM) combined with Poisson distribution was used to ch aracterise the change of species abundance along a humidity gradient. From 31 species tested, 21 have shown significant response to humidity. The majority of specie s tested had unimodal response, four species showed monotonic regression type. Based on their humidity optima, species distributed along a moisture gradient belonged to three main ecological groups: (i) mesohygrophilous woodland species living mostly in non-inundated areas with humidity optima below 4, (ii) hygrophilous, forest hygrophilous and euryhygric species with optima between 4 and 6 and (iii) strongly hygrophilous (polyhygrophilous) species with mois ture optima above 6. Estimated moisture preferences for Danubian floodplain woodland land snail fauna would be a useful tool in a longterm biological monitoring of changing moisture regime.

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Development of tools for ecological quality assessment in polish marine areas according to the Water Framework Directive. Part III - Secchi depth

Łysiak-Pastuszak E., Krzymiński W., Lewandowski Ł.

Oceanological and Hydrobiological Studies

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2009

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Vol. 38, No.3

113-124

EN

The implementation of the EU Water Framework Directive (WFD) requires ecological status quantification on the basis of biological and physico-chemical parameters, and an assessment of reference conditions and relevant environmental pressures for the construction of response curves. In this study the linking of water transparency, a proposed eutrophication indicator, to environmental pressure parameters was examined in the Polish sector of the Baltic Sea. Statistically significant linear correlations were detected between nutrient concentrations in sea water and Secchi depth, and between nutrient riverine loads and Secchi depth. The magnitude of acceptable deviation from reference conditions is also discussed.

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Development of tools for ecological quality assessment in Polish marine areas according to the Water Framework Directive. Part I - Nutrients

Łysiak-Pastuszak E., Krzymiński W., Lewandowski Ł.

Oceanological and Hydrobiological Studies

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2009

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Vol. 38, No.3

87-99

EN

Assessment of the ecological status of an aquatic environment according to the European Union Water Framework Directive (WFD) requires the determination of a link between the observed status of the marine ecosystem and catchment loading as well as the establishment of criteria for ecological status definitions. This article presents the results of a study identifying links between environmental pressures in the Polish sector of the Baltic Sea and state parameters applied in the assessment of eutrophication. Strong, statistically significant correlations were found between riverine loads of nutrients and their marine concentrations even in relatively short time data series.

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Development of tools for ecological quality assessment in polish marine areas according to the Water Framework Directive. Part II - Chlorophyll-α

Łysiak-Pastuszak E., Krzymiński W., Lewandowski Ł.

Oceanological and Hydrobiological Studies

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2009

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Vol. 38, No.3

101-112

EN

To implement the EU Water Framework Directive (WFD) it is necessary to establish tools enabling ecological status quantification on the basis of biological indicators, and to assess reference conditions and relevant environmental pressures for the construction of response curves. This study focuses on the Polish sector of the Baltic Sea. A number of statistically significant linear correlations, linking chlorophyll-a concentrations with pressure parameters, were found. Due to the lack of historical data, reference conditions and ecological class boundaries for chlorophyll-a assessment were determined using a simplified mathematical approach.