Ontologia

HydroBASINS lev08 watershed · #2080358160

Bassin de River Severn

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 3 administrative regions : Ceredigion, NA, Powys

2% lakePfafstetter: 23301490

Sub-basin area

1 047,4km²

Upstream area

1 047,4km²

Discharge

33,79m³/s

Mean elev.

243m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de River Severn608 km²

▲ Receives from 0 basins

Source / headwater (no upstream basin)

3 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

8 679 distinct species · 345 494 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

345 494 obs · 29 cellules
Obs. / cellule
≥ 39 487
30 642–39 486
13 903–30 641
8 117–13 902
< 8 117

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

Ecological tissue

Sample of 38 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 River Severn : 29 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 122 interactions GloBI sur 6 types (connectance 16.5%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
39
Interactions affichées
122
Connectance
0.165
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°

8,2°C

Annual rain

1 160mm

Moisture idx (CMI)

0,47

Runoff

986mm/an

PET

590mm

AET

530mm

Mean slope

6,0°

Water table

275cm

Forest

1%

Crops

14%

Urban

1%

Protected

2%

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