Ontologia

HydroBASINS lev08 watershed · #2080023250

Bassin de Naardertrekvaart

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 4 administrative regions : Gooise Meren, Hilversum, IJsselmeer, Weesp

Coastal basin 129% lakePfafstetter: 23270107

Sub-basin area

23km²

Upstream area

23,2km²

Discharge

0,36m³/s

Mean elev.

0m

Administrative coverage

4 dept-equivalent regions (GADM L2)

10 intersecting protected areas

  • NNN-NH

    IUCN Not Assigned

    Nature Reserves owned by professional nature management organizations

    8.02 km² overlap

  • Naardermeer

    IUCN IV

    Wetland of International Importance (Ramsar Site)

    6.91 km² overlap

  • Naardermeer

    IUCN IV

    Nature Conservation Act

    6.91 km² overlap

  • Naardermeer

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    6.91 km² overlap

  • Naardermeer

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    6.83 km² overlap

  • Markermeer & IJmeer

    IUCN Not Reported

    Special Protection Area (Birds Directive)

    2.47 km² overlap

  • Markermeer & IJmeer

    IUCN IV

    Nature Conservation Act

    2.47 km² overlap

  • Markermeer & IJmeer

    IUCN II

    Wetland of International Importance (Ramsar Site)

    2.47 km² overlap

  • IJmeer

    IUCN Not Reported

    Wetland of International Importance (Ramsar Site)

    1.93 km² overlap

1 more protected areas

  • Markermeer & IJmeer

    IUCN Not Reported

    Special Areas of Conservation (Habitats Directive)

    1.81 km² overlap

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

Species present

7 024 distinct species · 269 340 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

269 340 obs · 1 cellules
Obs. / cellule
≥ 269 340
269 340–269 339
269 340–269 339
269 340–269 339
< 269 340

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

Ecological tissue

Sample of 42 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 Naardertrekvaart : 37 espèces + 6 bulles famille, 80 interactions GloBI documentées sur 4 types (connectance 8.9%, filtre Serrano α=0.2). Les 6 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).

Espèces affichées
43
Interactions affichées
80
Connectance
0.089
Patrimoniales
0
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°

9,2°C

Annual rain

802mm

Moisture idx (CMI)

0,18

Runoff

482mm/an

PET

658mm

AET

529mm

Mean slope

0,3°

Water table

7cm

Forest

51%

Crops

3%

Urban

49%

Protected

41%

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