Information

Ecological parameter:  pH van Dam

Parameter group: habitat preference parameters

Explanation:
Species serve as indicators for pH (measure of the acidity or basicity of an aqueous solution) following van Dam et al. (1994), modified by Coste (Lecointe et al., 1993).
Species serve as indicators for pH (measure of the acidity or basicity of an aqueous solution) following van Dam et al. (1994).

1= acidobiontic optimal occurunce at pH <5.5
2= acidophilous mainly occurring at pH<7
3= circumneutral mainly occurring at pH-values about 7
4= alkaliphilous mainly occurring at pH>7
5= alkalibiontic exclusively occurring at pH>7
6= indifferent no apparent optimum
van DAM, H., MERTENS, A., SINKELDAM, J. (1994): A coded checklist and ecological indicator values of freshwater diatoms from the Netherlands. Neth. J. Aquat. Ecol.28 (1), 117-133. LECOINTE, C., COSTE, M. & J. PRYGIEL (2003): Omnidia 3.2. Diatom Index Software Including Diatom Database with Taxonomic Names, References and Codes of 11645 Diatom Taxa.

Assigned taxa for each higher systematic unit
TaxagroupNumber of assigned taxa / total number of taxa - percentage
Araphidees116 / 577 - 20.1%
Brachyraphydees56 / 366 - 15.3%
Centrophycidees88 / 847 - 10.3%
Epithemiacees15 / 82 - 18.2%
Monoraphidees104 / 528 - 19.6%
Naviculacees535 / 5376 - 9.9%
Nitzschiacees133 / 801 - 16.6%
Surirellacees44 / 291 - 15.1%