UNESCO-MAB Biosphere Reserve · irn
Arjan
- Area
- 654 km²
- IUCN cat.
- Not Applicable
- Year
- 1976
Overview
- Designation
- UNESCO-MAB Biosphere Reserve
- Established
- 1976
- Managing authority
- Not Reported
Source : WDPA (UNEP-WCMC, World Database on Protected Areas).
Species present
0 distinct species · 0 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 27 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).
Indicateurs du tissu écologique
Tissu écologique de Arjan : 19 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 52 interactions GloBI sur 4 types (connectance 14.8%, filtre Serrano α=0.2). 8 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydrology5 basins · 4 lakes · 3 rivers
Hydrology metrics for this exact territory
Stream length here
8,4km
Lake surface here
52,79km²
Basins crossed
5
Max stream order
2
Max drainage
1 127km²
Discharge in basins
5,6m³/s
Mean precip.
296mm/an
Mean T°
17,3°C
Moisture idx
-0,80
Max snow
4%
Mean runoff
211mm/an
Mean elev. (basins)
1 538m
Watersheds crossing here
Lakes (4, top by area)
Rivers / streams (3, ord ≥ 4)
Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10
Location
Fond cartographique : OpenFreeMap · © OpenStreetMap contributors · Géométrie : nos sources (GADM/HydroBASINS/HydroLAKES/HydroRIVERS/WDPA)
- Centroid
- 29.58698, 51.95289
- Open in maps
- OpenStreetMap → · Satellite →
Species observed (Phase 2)
Listing species observed within this protected area requires the GBIF v2 partition × WDPA spatial overlay matview. Computing infrastructure pending.