Ontologia

HydroLAKES lake · #164985

Alkmaardermeer

Natural lakeNetherlandsEurope -2 m

Surface area

5,81km²

Avg depth

1,3m

Volume

7,39km³

Shoreline

25,4km

Administrative coverage

Parent watershed

hybas-2080023220795 km² · upstream 795 km²

4 dept-equivalent regions (GADM L2)

  • Castricum
    Noord-Holland · Netherlands
    4.12 km²
    70.5% of lake
  • Uitgeest
    Noord-Holland · Netherlands
    1.64 km²
    28.1% of lake
  • Alkmaar
    Noord-Holland · Netherlands
    0.07 km²
    1.3% of lake
  • Zaanstad
    Noord-Holland · Netherlands
    0.00 km²
    0.1% of lake

1 intersecting protected areas

  • NNN-NH

    IUCN Not Assigned

    Nature Reserves owned by professional nature management organizations

    5.50 km² overlap

Computed live · HydroLAKES × GADM × WDPA · cached after first hit.

Species present

3 135 distinct species · 67 489 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

67 489 obs · 1 cellules
Obs. / cellule
≥ 67 489
67 489–67 488
67 489–67 488
67 489–67 488
< 67 489

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

Ecological tissue

Sample of 45 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 Alkmaardermeer : 40 espèces dont 2 patrimoniales (LR IUCN CR/EN/VU) + 5 bulles famille, 82 interactions GloBI documentées sur 4 types (connectance 8.3%, filtre Serrano α=0.2). Les 5 bulles regroupent des espèces visuellement absorbées par famille (≥3 espèces visibles).

Espèces affichées
45
Interactions affichées
82
Connectance
0.083
Patrimoniales
2
Plus dense que (national)0 %(top 100%)

Comparaison sur la connectance du réseau local complet vs distribution nationale (toutes les communes françaises).

Lake statistics (HydroLAKES)

Surface

5,81km²

Avg depth

1,3m

Volume

7,390km³

Watershed

196km²

Shoreline

25,4km

Shore dev. idx

2,98

Residence time

26days

Elevation

-2m

HydroLAKES v1.0 (Messager et al. 2016) · 1.4M lacs ≥ 0.1 km² mondialement.