Information
Ecological parameter: rhithral preference (RTI)
Parameter group: region related parameters
Explanation:
The RTI ("Rhithrontypieindex") describes the affinity of a taxon to the rhithral region of a river or stream. Taxa are assigned values between 1 and 5 according to the procedure described in Biss et al. (2002) and the stream zonation classification according to Schmedtje & Colling (1996) and Moog (1995). A high value indicates that a taxon is typically found in the rhithral region of a river.
Biss, R., Kübler, P., Pinter, I. & Braukmann, U. (2002): Leitbildbezogenes biozönotisches Bewertungsverfahren für Fließgewässer (aquatischer Bereich) in der Bundesrepublik Deutschland. Ein erster Beitrag zur integrierten ökologischen Fließgewässerbewertung. Umweltbundesamt Texte 62/02.
Schmedtje, U. & Colling, M. (1996): Ökologische Typisierung der aquatischen Makrofauna. Informationsberichte des Bayerischen Landesamtes für Wasserwirtschaft 4/96, 543 pp.
Moog, O. (ed.) (1995): Fauna Aquatica Austriaca - A Comprehensive Species Inventory of Austrian Aquatic Organisms with Ecological Notes. Federal Ministry for Agriculture and Forestry, Wasserwirtschaftskataster Vienna: loose-leaf binder.
Type of assignment: affinity score assignment system (1 to 5)
A description of the coding system can be found here Abbreviations/Coding Systems
Abbreviations:
| Category name: | Abbreviations: | Explanation: |
|---|---|---|
| rhithral preference | RTI | preference for the rhithral zone |
| 1 | 1 | taxon with no affinity to the rhithral zone |
| 2 | 2 | taxon with low affinity to the rhithral zone |
| 3 | 3 | taxon with medium affinity to the rhithral zone |
| 4 | 4 | taxon with clear affinity to the rhithral zone |
| 5 | 5 | taxon with high affinity to the rhithral zone |
| Taxagroup | Number of assigned taxa / total number of taxa - percentage |
|---|---|
| Bivalvia | 16 / 77 - 20.7% |
| Branchiobdellida | 1 / 8 - 12.5% |
| Bryozoa | 11 / 19 - 57.8% |
| Chironomidae | 33 / 1315 - 2.5% |
| Coelenterata | 1 / 13 - 7.6% |
| Coleoptera | 125 / 2678 - 4.6% |
| Crustacea | 9 / 270 - 3.3% |
| Diptera (excl. Chironomidae) | 109 / 2404 - 4.5% |
| Ephemeroptera | 140 / 353 - 39.6% |
| Gastropoda | 21 / 241 - 8.7% |
| Heteroptera | 8 / 124 - 6.4% |
| Hirudinea | 30 / 68 - 44.1% |
| Megaloptera | 3 / 6 - 50% |
| Odonata | 24 / 174 - 13.7% |
| Oligochaeta | 15 / 240 - 6.2% |
| Planipennia | 6 / 12 - 50% |
| Plecoptera | 127 / 576 - 22% |
| Porifera | 6 / 12 - 50% |
| Trichoptera | 324 / 1439 - 22.5% |
| Turbellaria | 17 / 61 - 27.8% |