Ontologia

Rivière· 89 segments

Otra

Crosses 7 administrative regions : Bygland, Bykle, Evje og Hornnes, Iveland, Kristiansand +2

rivière

Total length

169km

Max discharge

132,1m³/s

Max Strahler

5

Segments matched

89

River geography7 admin regions · 0 communes

Parent watershed

hybas-20802546501549 km²

7 administrative regions crossed (GADM L2)

  • Bykle
    Aust-Agder · Norway
    55.7 km
    in this dpt
  • Valle
    Aust-Agder · Norway
    42.5 km
    in this dpt
  • Vennesla
    Vest-Agder · Norway
    32.1 km
    in this dpt
  • Iveland
    Aust-Agder · Norway
    27.8 km
    in this dpt
  • Evje og Hornnes
    Aust-Agder · Norway
    23.9 km
    in this dpt
  • Bygland
    Aust-Agder · Norway
    21.5 km
    in this dpt
  • Kristiansand
    Vest-Agder · Norway
    12.3 km
    in this dpt

15 intersecting protected areas

6 more protected areas

1 page = 1 named river (aggregation of 89 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

852 distinct species · 1 349 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Ecological tissue

Sample of 34 species (selected proportionally per kingdom among those with at least one documented interaction here) to keep the graph readable. Hover for details, click to explore the full ecosystem of a species.

ℹ️ The territory contains many more species than displayed and all their documented interactions: the graph is intentionally the structural skeleton (top-N species by composite local score, edges filtered by Serrano 2009 disparity filter α=0.2).

RègnesAnimalPlanteChampignonBacterie
RelationsPredationParasitismeSymbiosePollinisation
StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Otra : 29 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 43 interactions GloBI sur 4 types (connectance 7.7%, filtre Serrano α=0.2). 5 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
34
Interactions affichées
43
Connectance
0.077
Patrimoniales
1
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Hydrology (HydroRIVERS v10)

Total length

169km

Max discharge

132,1m³/s

Max Strahler

5

Segments matched

89

HydroRIVERS v1.0 (Lehner et al. 2019) aggregated by name + main_riv → 1 entity = 1 named river.