Ontologia

HydroBASINS lev08 watershed · #2080213770

Bassin de Hässjaån

A watershed (drainage basin) is not a body of water — it is the land area where rainfall converges towards a single river that eventually reaches the sea (or an endorheic basin). Boundaries follow ridgelines.

Crosses 3 administrative regions : Bollnäs, Ljusdal, Ovanåker

50% lakePfafstetter: 24450822

Sub-basin area

665,9km²

Upstream area

666km²

Discharge

5,03m³/s

Mean elev.

263m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Voxnan284 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

3 dept-equivalent regions (GADM L2)

30 intersecting protected areas

  • 2052183 Klimparna

    IUCN Ia

    Nature Reserve

    9.27 km² overlap

  • Grytaberg

    IUCN IV

    Nature conservation agreement

    7.72 km² overlap

  • Klimparna

    IUCN Ia

    Natura 2000 SCI

    7.24 km² overlap

  • Klimparna

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    7.24 km² overlap

  • Grytaberg

    IUCN IV

    Nature conservation agreement

    5.35 km² overlap

  • Grytaberget

    IUCN Not Assigned

    Natura 2000 SCI

    3.17 km² overlap

  • Grytaberget

    IUCN Not Assigned

    Natura 2000 SPA

    3.17 km² overlap

  • Grytaberget

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    3.17 km² overlap

  • Grytaberget

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    3.17 km² overlap

21 more protected areas

Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.

Species present

2 459 distinct species · 47 525 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

47 525 obs · 25 cellules
Obs. / cellule
≥ 6 270
4 753–6 269
1 881–4 752
1 346–1 880
< 1 346

Source : GBIF — observations agrégées par hexagones 0.027° × 0.027° (~22km), filtre précision coordonnée < 10 km. Fond carte : OpenFreeMap · © OpenStreetMap.

Ecological tissue

Sample of 24 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 Bassin de Hässjaån : 18 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 57 interactions GloBI sur 5 types (connectance 19.0%, filtre Serrano α=0.2). 7 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
25
Interactions affichées
57
Connectance
0.190
Patrimoniales
1
Plus dense que (national)0 %(top 100%)

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

Hydroclimate (BasinATLAS lev08)

Mean T°

3,2°C

Annual rain

643mm

Moisture idx (CMI)

0,14

Runoff

241mm/an

PET

550mm

AET

434mm

Mean slope

5,3°

Water table

289cm

Forest

95%

Crops

0%

Urban

0%

Protected

0%

HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)