Information

Ecological parameter:  pH Denys Hustedt

Parameter group: habitat related parameters

Explanation:
Classification as pH indicator following Hustedt (1957). Values taken from van Dam et al. (1994).
Hustedt, F. (1957): Die Diatomeenflora des Flusssystems der Weser im Gebiet der Hansestadt Bremen. Abh. Naturw. Ver. Bremen 34 (3): 181-440.
Van Dam, H., Mertens, A. & Sinkeldam, J. (1994): A coded checklist and ecological indicator values of freshwater diatoms from the Netherlands. Netherlands J. Aquatic Ecol. 28 (1): 117-133.

Abbreviations:

Category name	Abbreviation	Explanation
pH indicator	indicator	pH indicator
1	1	irrelevant
2	2	alkalibiontic
3	3	alkalibiontic to alkaliphilous
4	4	alkaliphilous (=basiphilous)
5	5	alkaliphilous to circumneutral
6	6	circumneutral (= neutrophilous)
7	7	circumneutral to acidophilous
8	8	acidophilous
9	9	acidophilous to acidobiontic
10	10	acidobiontic
11	11	indifferent (= no apparent optimum)

Assigned taxa for each higher systematic unit

Taxagroup	Number of assigned taxa / total number of taxa - percentage
Surirellacees	797 / 6949 - 11.4%