Ontologia

HydroBASINS lev08 watershed · #2080031860

Bassin de Trosaån

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 6 administrative regions : Flen, Gnesta, Nyköping, Strängnäs, Södertälje +1

108% lakePfafstetter: 24473002

Sub-basin area

557,6km²

Upstream area

557,6km²

Discharge

1,63m³/s

Mean elev.

44m

Administrative coverage

6 dept-equivalent regions (GADM L2)

30 intersecting protected areas

21 more protected areas

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

Species present

7 758 distinct species · 427 381 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

427 381 obs · 20 cellules
Obs. / cellule
≥ 67 508
66 277–67 507
24 467–66 276
13 627–24 466
< 13 627

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

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 Bassin de Trosaån : 18 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 87 interactions GloBI sur 5 types (connectance 23.0%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
28
Interactions affichées
87
Connectance
0.230
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°

6,6°C

Annual rain

544mm

Moisture idx (CMI)

-0,06

Runoff

184mm/an

PET

576mm

AET

417mm

Mean slope

2,6°

Water table

207cm

Forest

73%

Crops

13%

Urban

1%

Protected

3%

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