Ruisseau

Trosaån

Crosses 3 administrative regions : Gnesta, Södertälje, Trosa

ruisseau

Total length

12km

Max discharge

1,7m³/s

Max Strahler

Segments matched

River geography3 admin regions · 0 communes

Parent watershed

hybas-2080031860558 km²

3 administrative regions crossed (GADM L2)

Trosa
Södermanland · Sweden
15.1 km
in this dpt
Gnesta
Södermanland · Sweden
3.4 km
in this dpt
Södertälje
Stockholm · Sweden
3.1 km
in this dpt

20 intersecting protected areas

Tullgarn södra
IUCN V
Natura 2000 SPA
Tullgarn södra
IUCN V
Natura 2000 SCI
Tullgarn södra
IUCN Not Reported
Special Protection Area (Birds Directive)
Tullgarn södra
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
2002405 Tullgarn
IUCN V
Nature Conservation Area
2024410 Tomtaklintskogen
IUCN Ia
Nature Reserve
2044690 Lånestaheden
IUCN IV
Nature Reserve
2001313 Lotsängsbacken
IUCN IV
Nature Reserve
Borgmästarholmen
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)

11 more protected areassorted by area

Borgmästarholmen
IUCN Not Assigned
Natura 2000 SCI
Lotsängsbacken
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
Lotsängsbacken
IUCN IV
Natura 2000 SCI
Sjögård
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
Sjögård
IUCN Not Assigned
Natura 2000 SCI
Lånestaheden
IUCN IV
Natura 2000 SCI
Lånestaheden
IUCN Not Reported
Special Areas of Conservation (Habitats Directive)
SK 212-2002
IUCN Ia
Habitat Protection Area
SK 57-1996
IUCN IV
Nature conservation agreement, Swedish Forest Agency
SK 123-2007
IUCN Ia
Habitat Protection Area
SK 501-2004
IUCN Ia
Habitat Protection Area

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

Species present

2 453 distinct species · 33 722 observations

Source: GBIF Occurrence snapshot 2026-05-01.

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

RègnesAnimalPlanteChampignonBacterie

RelationsPredationParasitismeSymbiosePollinisation

StatutEn dangerVulnérableProtégéeEndémique

Indicateurs du tissu écologique

Tissu écologique de Trosaån : 18 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 78 interactions GloBI sur 4 types (connectance 19.2%, filtre Serrano α=0.2). 11 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées

Interactions affichées

Connectance

0.192

Patrimoniales

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)