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Mapping the Potentially Affected Fraction of Avian and Mammalian Target Species in the National Ecological Network

Kartering van de potentieel aangetaste fractie van de doelsoorten (vogels en zoogdieren) die behoren bij de natuurdoeltypen van de ecologische hoofdstructuur

Synopsis

In this report a method is presented for calculating the Potentially Affected Fractions (PAFs) of mammalian and avian target species of the different nature target types of the national ecological network in the Netherlands. The PAF is the fraction of species for which the concentration of a certain compound in the environment exceeds their No Effect Concentration (NEC). The method is applied for cadmium, zinc and copper. The PAFs for background concentrations of cadmium are already quite high in the western and northern parts of the Netherlands and are relatively low in the more sandy soils of the Netherlands. Based on total concentration for cadmium the PAF is greater than 0.1 in most parts of the Netherlands, except in the dunes of Noord-Holland and the isles of the Waddensea, the Waddensea itself and some parts of Drenthe. High anthropogenic PAFs for cadmium can be found on the sandy soils of the Netherlands, but especially in the Kempen. The PAFs for background concentrations of copper are relative high in the dunes and along the greater rivers. The PAFs for total concentrations of copper are just slightly higher than for the background concentration. Therefore, the anthropogenic PAFs for copper are all low (<0.1). The PAFs for the background concentrations of zinc are relative high in the peat areas of the western and northern Netherlands and along the greater rivers. The PAFs for the total concentrations of zinc are on average slightly higher in the western peat areas of the Netherlands. Therefore, elevated PAFs for the anthropogenic contribution are only found in the western peat areas. Despite several shortcomings in the applied model it can be expected that significant toxic stress occurs at the highest PAFs, but validation of these results is needed.
 

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