Ontologia

HydroBASINS lev08 watershed · #2080031720

Bassin de Holmbroån

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 5 administrative regions : Knivsta, Norrtälje, Sigtuna, Vallentuna, Österåker

19% lakePfafstetter: 24471008

Sub-basin area

422,5km²

Upstream area

422,5km²

Discharge

3,12m³/s

Mean elev.

36m

Administrative coverage

5 dept-equivalent regions (GADM L2)

30 intersecting protected areas

21 more protected areas

  • 2002196 Domarudden

    IUCN Not Assigned

    Nature Reserve

    0.21 km² overlap

  • Storanden

    IUCN IV

    Natura 2000 SCI

    0.19 km² overlap

  • Storanden

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.19 km² overlap

  • Pekhagen

    IUCN Not Assigned

    Natura 2000 SCI

    0.15 km² overlap

  • Pekhagen

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.15 km² overlap

  • SK 305-2011

    IUCN IV

    Nature conservation agreement, Swedish Forest Agency

    0.12 km² overlap

  • Tarby-Åttesta

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.10 km² overlap

  • Tarby-Åttesta

    IUCN Not Assigned

    Natura 2000 SCI

    0.10 km² overlap

  • SK 578-2003

    IUCN IV

    Nature conservation agreement, Swedish Forest Agency

    0.09 km² overlap

  • SK 190-2006

    IUCN IV

    Nature conservation agreement, Swedish Forest Agency

    0.09 km² overlap

  • SK 94-2010

    IUCN Ia

    Habitat Protection Area

    0.08 km² overlap

  • SK 503-2004

    IUCN IV

    Nature conservation agreement, Swedish Forest Agency

    0.08 km² overlap

  • SK 690-2003

    IUCN IV

    Nature conservation agreement, Swedish Forest Agency

    0.07 km² overlap

  • Öbacken

    IUCN Not Assigned

    Natura 2000 SCI

    0.06 km² overlap

  • Öbacken

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    0.06 km² overlap

  • SK 78-2013

    IUCN Ia

    Habitat Protection Area

    0.06 km² overlap

  • SK 168-1999

    IUCN Ia

    Habitat Protection Area

    0.05 km² overlap

  • SK 281-2000

    IUCN Ia

    Habitat Protection Area

    0.05 km² overlap

  • SK 415-2003

    IUCN Ia

    Habitat Protection Area

    0.05 km² overlap

  • SK 147-2018

    IUCN IV

    Nature conservation agreement, Swedish Forest Agency

    0.04 km² overlap

  • SK 425-2011

    IUCN Ia

    Habitat Protection Area

    0.04 km² overlap

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

Species present

6 566 distinct species · 623 588 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

623 588 obs · 14 cellules
Obs. / cellule
≥ 380 330
56 893–380 329
22 866–56 892
16 533–22 865
< 16 533

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

Ecological tissue

Sample of 29 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 Holmbroån : 22 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) reliées par 63 interactions GloBI sur 3 types (connectance 14.5%, filtre Serrano α=0.2). 8 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
30
Interactions affichées
63
Connectance
0.145
Patrimoniales
2
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°

6,5°C

Annual rain

534mm

Moisture idx (CMI)

-0,05

Runoff

241mm/an

PET

563mm

AET

408mm

Mean slope

2,3°

Water table

156cm

Forest

68%

Crops

32%

Urban

3%

Protected

2%

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