Ontologia

County · USA

Merrimack

United States

DfbCold, no dry season, warm summer(59 %)

Species observed

4 526

Observations

841 167

Area

2 478,5km²

Ecological tissue

Sample of 35 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 Merrimack : 25 espèces reliées par 83 interactions GloBI sur 4 types (connectance 12.5%, filtre Serrano α=0.2). 12 bulles taxonomiques (cascade genre/famille GloBI, ≥3 espèces).

Espèces affichées
37
Interactions affichées
83
Connectance
0.125
Patrimoniales
0
Plus dense que (national)0 %(top 100%)

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

Species present

4 526 distinct species · 841 167 observations

Source: GBIF Occurrence snapshot 2026-05-01.

Densité d'observations

841 167 obs · 66 cellules
Obs. / cellule
≥ 127 911
25 506–127 910
10 861–25 505
3 955–10 860
< 3 955

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

Climate

Mean T°

8,0°C

Annual rain

1 252mm

Warmest m°

26,3°C

Coldest m°

-11,0°C

Elevation: 222 m on average (min 67 m, max 719 m)

Bioclimatic detailsExpert
Annual mean temp.
8,0°C
Annual rain
1 252mm
Warmest month
26,3°C
Coldest month
-11,0°C
Mean alt.
222m
Min
67m
Max
719m
Std. dev.
102m
Köppen-Geiger (dominant)
DfbCold, no dry season, warm summer(59 %)Cold

CHELSA BIO 1-19 v2.1 · ETOPO DEM 60s · Köppen-Geiger 1991-2020 (Beck et al. 2018)

Soil & lithology

pH H₂O

5,0

Org. C

82,6g/kg

Clay

8,8%

Sand

55,0%

Silt

36,2%

Average over 0-30 cm. Per-depth details in expert panel.

Dominant lithology: mtGLiM

3 soil depths detailedExpert
0–5 cm
pH H₂O
4,8
Org. C
185,4g/kg
Clay
8,9%
Sand
54,7%
Silt
36,3%
5–15 cm
pH H₂O
5,0
Org. C
43,8g/kg
Clay
8,8%
Sand
54,9%
Silt
36,3%
15–30 cm
pH H₂O
5,2
Org. C
18,6g/kg
Clay
8,7%
Sand
55,4%
Silt
35,9%

SoilGrids 250m (ISRIC, 2017) · GLiM v1.0 (Hartmann & Moosdorf 2012)

Land cover

Forest79.8%
Crops3.6%
Built-up0.7%
Bare soil0.3%
Other (grassland, water…)15.6%

Copernicus Global Land Cover 100m (Buchhorn et al. 2020)

Hydrology13 basins · 50 lakes · 95 rivers

Hydrology metrics for this exact territory

Stream length here

701,9km

Lake surface here

39,78km²

Basins crossed

13

Max stream order

6

Max drainage

8 406km²

Discharge in basins

533,6m³/s

Mean precip.

1 094mm/an

Mean T°

6,7°C

Moisture idx

0,14

Max snow

32%

Mean runoff

675mm/an

Mean elev. (basins)

265m

Watersheds crossing here

4 more basins

Lakes (50, top by area)

41 more lakes

Rivers / streams (95, ord ≥ 4)

83 more river segments

Live spatial overlap (cached after first hit) · HydroBASINS lev08 × HydroLAKES × HydroRIVERS v10

Human pressure

Pop. density

0hab/km²

Night light

1,0nW

Built-up

67,2%

Pesticides

3,7kg/km²

GHSL POP/Built 2020 · VIIRS lumière nocturne · PEST-CHEMGRIDS 2020 (Maggi et al.)

Protected areas96

IUCN V · 66IUCN Not Assigned · 22IUCN VI · 5IUCN IV · 2IUCN III · 1

Great Bay

IUCN V

National Wildlife Refuge

5 km²

Witte

IUCN V

Forest Management Area

2 km²

Complete list

+ 36 protected areas (top 60 shown)

WDPA (World Database on Protected Areas) — UNEP-WCMC & IUCN