HydroBASINS lev08 watershed · #2080031600
Bassin de Gullströmsån
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 2 administrative regions : Norrtälje, Östhammar
Sub-basin area
521,4km²
Upstream area
521,4km²
Discharge
3,68m³/s
Mean elev.
19m
Administrative coverage
2 dept-equivalent regions (GADM L2)
- 435.5 km²83.1% of basin
- 51.2 km²9.8% of basin
30 intersecting protected areas
Gräsö/Singö Archipelago
IUCN Not ReportedBaltic Sea Protected Area (HELCOM)
11.43 km² overlap
Örskär
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
4.16 km² overlap
2002166 Örskär
IUCN VNature Reserve
4.16 km² overlap
Örskär
IUCN VNatura 2000 SCI
4.16 km² overlap
2002542 Slätön-Medholma
IUCN IaNature Reserve
3.40 km² overlap
Fagerön
IUCN VNatura 2000 SCI
3.12 km² overlap
Fagerön
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
3.12 km² overlap
2002541 Fagerön
IUCN VNature Reserve
3.12 km² overlap
2002536 Gräsö gård
IUCN IVNature Reserve
3.10 km² overlap
21 more protected areassorted by overlap area
2014267 Norrboda-Ugglan
IUCN IaNature Reserve
1.49 km² overlap
Hovön-Alnön
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.39 km² overlap
Hovön-Alnön
IUCN VNatura 2000 SCI
1.39 km² overlap
2002538 Hovön-Alnön
IUCN VNature Reserve
1.39 km² overlap
2055343 Dansarberg
IUCN IaNature Reserve
1.39 km² overlap
2022349 Grundsjön
IUCN IaNature Reserve
1.33 km² overlap
Idön
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
1.31 km² overlap
Idön
IUCN IaNatura 2000 SCI
1.31 km² overlap
2010910 Idön
IUCN IaNature Reserve
1.27 km² overlap
Nature Reserve
1.24 km² overlap
2004557 Östra Tvärnö
IUCN IaNature Reserve
0.96 km² overlap
2054041 Norrboda-Kråkan
IUCN IaNature Reserve
0.76 km² overlap
Eriksdal-Lönnholmen
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.66 km² overlap
Eriksdal-Lönnholmen
IUCN Not AssignedNatura 2000 SCI
0.66 km² overlap
2002768 Tuskösundet
IUCN IaNature Reserve
0.59 km² overlap
Rävsten
IUCN Not AssignedNatura 2000 SCI
0.58 km² overlap
Rävsten
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.58 km² overlap
Raggarön
IUCN IaNatura 2000 SCI
0.57 km² overlap
Raggarön
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.57 km² overlap
Gräsö gård
IUCN IVNatura 2000 SCI
0.49 km² overlap
Gräsö gård
IUCN Not ReportedSpecial Areas of Conservation (Habitats Directive)
0.49 km² overlap
Computed live · GADM 4.1 × HydroBASINS lev08 × WDPA · cached after first hit.
Species present
6 417 distinct species · 185 025 observations
Source: GBIF Occurrence snapshot 2026-05-01.
Ecological tissue
Sample of 28 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 Bassin de Gullströmsån : 20 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 60 interactions GloBI sur 6 types (connectance 14.8%, filtre Serrano α=0.2). 9 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).
Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).
Hydroclimate (BasinATLAS lev08)
Mean T°
5,5°C
Annual rain
551mm
Moisture idx (CMI)
0,01
Runoff
295mm/an
PET
547mm
AET
401mm
Mean slope
1,5°
Water table
110cm
Forest
96%
Crops
4%
Urban
0%
Protected
4%
HydroATLAS BasinATLAS v10 (Linke et al. 2019) · HydroBASINS lev08 (Lehner & Grill 2013)