Ontologia

Ruisseau· 6 segments

Holmbroån

Crosses 3 administrative regions : Norrtälje, Sigtuna, Vallentuna

ruisseau

Total length

13km

Max discharge

1,5m³/s

Max Strahler

2

Segments matched

6

River geography3 admin regions · 0 communes

Parent watershed

hybas-2080031720423 km²

3 administrative regions crossed (GADM L2)

  • Norrtälje
    Stockholm · Sweden
    15.9 km
    in this dpt
  • Sigtuna
    Stockholm · Sweden
    6.8 km
    in this dpt
  • Vallentuna
    Stockholm · Sweden
    5.6 km
    in this dpt

6 intersecting protected areas

  • Pekhagen

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

  • Pekhagen

    IUCN Not Assigned

    Natura 2000 SCI

  • Öbacken

    IUCN Not Assigned

    Natura 2000 SCI

  • Öbacken

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

  • SK 147-2018

    IUCN IV

    Nature conservation agreement, Swedish Forest Agency

  • SK 1042-2004

    IUCN Ia

    Habitat Protection Area

1 page = 1 named river (aggregation of 6 HydroRIVERS v10 segments). Spatial join cached after first hit.

Species present

1 568 distinct species · 16 533 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).

RègnesAnimalPlanteChampignonBacterie
RelationsPredationParasitismeSymbiosePollinisation
StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Holmbroån : 17 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 86 interactions GloBI sur 4 types (connectance 19.8%, filtre Serrano α=0.2). 13 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
30
Interactions affichées
86
Connectance
0.198
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

13km

Max discharge

1,5m³/s

Max Strahler

2

Segments matched

6

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