Information

Ecological parameter:  rhithral preference (RTI)

Parameter group: region preference parameters

Explanation:
RTI describes the affinity of a taxon to the rhithral region of a river/stream. Taxa are assigned values between 1 and 5 according to Biss et al. (2002). 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.


Classification system: metric value (1-5)

Abbreviations:
Category nameAbbreviationExplanation
RTIRhithron-Typie-Index
1no association to rhithral zone
2
3
4
5strong association to rhithral zone
Assigned taxa for each higher systematic unit
TaxagroupNumber of assigned taxa / total number of taxa - percentage
Porifera3 / 9 - 33.3%
Turbellaria12 / 60 - 20%
Gastropoda21 / 230 - 9.1%
Bivalvia16 / 66 - 24.2%
Oligochaeta15 / 234 - 6.4%
Hirudinea11 / 66 - 16.6%
Branchiobdellida1 / 8 - 12.5%
Crustacea9 / 255 - 3.5%
Ephemeroptera76 / 344 - 22%
Odonata25 / 158 - 15.8%
Plecoptera102 / 571 - 17.8%
Heteroptera8 / 124 - 6.4%
Megaloptera3 / 6 - 50%
Planipennia3 / 12 - 25%
Coleoptera126 / 3342 - 3.7%
Trichoptera202 / 1428 - 14.1%
Diptera (excl. Chironomidae)63 / 2342 - 2.6%
Chironomidae34 / 1278 - 2.6%
Bryozoa1 / 16 - 6.2%