Ontologia

HydroBASINS lev08 watershed · #2080021830

Bassin du Thar

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 1 administrative regions : Manche

Coastal basinPfafstetter: 23230555

Sub-basin area

363,8km²

Upstream area

363,8km²

Discharge

1,92m³/s

Mean elev.

55m

Administrative coverage

1 dept-equivalent regions (GADM L2)

52 communes (GADM L5)

22 intersecting protected areas

  • Baie du Mont Saint-Michel

    IUCN Not Reported

    Wetland of International Importance (Ramsar Site)

    20.88 km² overlap

  • Baie du Mont Saint-Michel

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    16.72 km² overlap

  • Baie du Mont Saint-Michel

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    15.31 km² overlap

  • Chausey

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    12.29 km² overlap

  • Chausey

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    12.29 km² overlap

  • Iles chausey

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    11.70 km² overlap

  • Littoral Ouest du Cotentin de Bréhal à Pirou

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    9.69 km² overlap

  • Havre de la Sienne

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    2.88 km² overlap

  • Dunes de dragey

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    1.51 km² overlap

13 more protected areas

  • Mare de bouillon

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    1.16 km² overlap

  • Récifs d\'hermelles de la baie du Mont Saint-Michel Site de Champeaux

    IUCN IV

    Natural habitats protection Order

    0.90 km² overlap

  • Pointe de champeaux

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    0.85 km² overlap

  • Les Minquiers

    IUCN Not Reported

    Wetland of International Importance (Ramsar Site)

    0.48 km² overlap

  • Les Minquiers

    IUCN Not Reported

    Marine Protected Area (OSPAR)

    0.48 km² overlap

  • Pointe d\'agon

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    0.35 km² overlap

  • Pointe du grouin du sud

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    0.31 km² overlap

  • Havre de la vanlee

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    0.28 km² overlap

  • Dunes de breville

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    0.14 km² overlap

  • Dunes et marais d\'annoville

    IUCN IV

    Land acquired by Conservatoire du Littoral (national seaside and lakeside conservancy)

    0.12 km² overlap

  • Coastal National Park

    IUCN Not Reported

    National Park

    0.07 km² overlap

  • La Sienne Et Ses Affluents

    IUCN IV

    Biotope Protection Order

    0.01 km² overlap

  • prevital

    IUCN IV

    Land acquired by a regional conservatory of natural areas

    0.00 km² overlap

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

Species present

3 300 distinct species · 64 655 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

64 655 obs · 10 cellules
Obs. / cellule
≥ 15 141
15 141–15 140
10 650–15 140
5 040–10 649
< 5 040

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 du Thar : 28 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 110 interactions GloBI sur 6 types (connectance 15.6%, filtre Serrano α=0.2). 10 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
38
Interactions affichées
110
Connectance
0.157
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°

11,3°C

Annual rain

772mm

Moisture idx (CMI)

0,06

Runoff

669mm/an

PET

729mm

AET

546mm

Mean slope

1,8°

Water table

138cm

Forest

4%

Crops

40%

Urban

5%

Protected

4%

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