Ecological parameter: tolerance score

Parameter group: region related parameters

Explanation:
The parameter indicates the potential distribution range of a species based on its stream (longitudinal) zonation preference. Species with a high score only occur within narrow distribution limits while species with a low score have a wide distribution range. For calculating the score, littoral and profundal preferences are generally included, but species with more than half of their distribution points allocated in littoral and profundal zones are excluded. The score is the basis for calculating the tolerance index (TI) of a coenosis (Graf et al., 2020).

Graf, W., Zoltan, L., Dossi, F. & Hayes, D. (2020): (in prep.): An integrative new index for assessing the ecological status of runnig waters: longitudinal distribution indicates sensitivity to environmental conditions.

Type of assignment: single category assignment system ()
A description of the coding system can be found here  Abbreviations/Coding Systems

Abbreviations:

Category name:	Abbreviations:	Explanation:
tolerant	tol	species with a wide distribution range
moderately tolerant	mtol	species with a moderately wide distribution range
moderately sensitive	msen	species with a moderately small distribution range
sensitive	sen	species with a small distribution range
highly sensitive	hsen	species with a very small distribution range

Assigned taxa for each higher systematic unit:

Taxagroup	Number of assigned taxa / total number of taxa - percentage
Bivalvia	35 / 77 - 45.4%
Branchiobdellida	2 / 8 - 25%
Chironomidae	200 / 1315 - 15.2%
Coleoptera	162 / 2678 - 6%
Crustacea	36 / 270 - 13.3%
Diptera (excl. Chironomidae)	54 / 2404 - 2.2%
Ephemeroptera	197 / 353 - 55.8%
Gastropoda	74 / 241 - 30.7%
Heteroptera	5 / 124 - 4%
Hirudinea	28 / 68 - 41.1%
Megaloptera	1 / 6 - 16.6%
Odonata	13 / 174 - 7.4%
Oligochaeta	66 / 240 - 27.5%
Plecoptera	382 / 576 - 66.3%
Polychaeta	2 / 13 - 15.3%
Trichoptera	737 / 1439 - 51.2%
Turbellaria	12 / 61 - 19.6%