Information

Ecological parameter:  nitrogen van Dam

Parameter group: habitat preference parameters

Explanation:
Species serve as indicators for nitrogen (measure of eutrophication) following van Dam et al. (1994), modified by Coste (Lecointe et al., 1993).
Species serve as indicators for nitrogen (measure of eutrophication) following van Dam et al. (1994).

1= nitrogen-autotrophic taxa, tolerating very small concentrations of organically bound nitrogen
2= nitrogen-autotrophic taxa, tolerating elevated concentrations of organically bound nitrogen
3= facultatively nitrogen-heterotrophic taxa, needing periodically elevated concentrations of organically bound nitrogen
4= obligately nitrogen-heterotrophic taxa, needing continuously elevated concentrations of organically bound nitrogen


Assigned taxa for each higher systematic unit
TaxagroupNumber of assigned taxa / total number of taxa - percentage
Araphidees76 / 577 - 13.1%
Brachyraphydees48 / 366 - 13.1%
Centrophycidees45 / 847 - 5.3%
Epithemiacees7 / 82 - 8.5%
Monoraphidees63 / 528 - 11.9%
Naviculacees305 / 5376 - 5.6%
Nitzschiacees76 / 801 - 9.4%
Surirellacees16 / 291 - 5.4%