Information
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.
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 |
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% |