| Popis: |
In studying the possibilities for mapping toxic pressure of contaminants (expressed as Potentially Affected Fraction, PAF) on such target species as butterflies, dragonflies, amphibians, reptiles and plants, the toxicity data available for butterflies, damselflies, dragonflies and reptiles were found to be insufficient. Low PAF values (less than 1%) for copper, zinc and cadmium were found for amphibians at median surface water concentrations. PAF calculations for higher plants indicate a higher toxic pressure for zinc than for cadmium or copper. The highest toxic pressure due to the presence of these metals is found in the 'Brabantse Kempen' area. |
