Ontologia

HydroBASINS lev08 watershed · #8080307070

Bassin de Alagnak River

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 : Lake and Peninsula

14% lakePfafstetter: 81158023

Sub-basin area

1 052,2km²

Upstream area

3 456,3km²

Discharge

73,33m³/s

Mean elev.

125m

Administrative coverage

Hydrographic chain

▼ Drains into

Bassin de Alagnak River69 km²

▲ Receives from 2 basins

1 dept-equivalent regions (GADM L2)

4 intersecting protected areas

  • Katmai

    IUCN Ib

    Wilderness Area

    143.16 km² overlap

  • Katmai

    IUCN V

    National Preserve

    140.48 km² overlap

  • Alagnak

    IUCN V

    Wild River

    85.93 km² overlap

  • Katmai Bay

    IUCN II

    National Park

    1.96 km² overlap

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

Species present

186 distinct species · 1 149 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

1 149 obs · 28 cellules
Obs. / cellule
≥ 240
193–239
29–192
10–28
< 10

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

Ecological tissue

Sample of 36 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 Alagnak River : 17 espèces dont 1 patrimoniale (LR IUCN CR/EN/VU) reliées par 114 interactions GloBI sur 3 types (connectance 17.1%, filtre Serrano α=0.2). 20 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
37
Interactions affichées
114
Connectance
0.171
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°

0,6°C

Annual rain

583mm

Moisture idx (CMI)

0,16

Runoff

484mm/an

PET

484mm

AET

391mm

Mean slope

1,9°

Water table

105cm

Forest

0%

Crops

0%

Urban

0%

Protected

29%

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