What is the 'subnivium' habitat zone?

What is the 'subnivium' habitat zone?

• A. The space between the soil surface and the snowpack
• B. The canopy above the forest
• C. The upper leaf litter layer
• D. The subsoil below the root zone

Answer: (A)

The subnivium is the insulating microhabitat under a snowpack, the space between the snow and the soil surface. Snow acts as a blanket, dampening temperature swings and keeping this zone relatively stable and moderately cold, which allows soil-dwelling organisms to persist through winter. This habitat supports creatures like many soil invertebrates and microbial life that would struggle with exposed freezing above ground. It’s distinct from the forest canopy high above, from the upper leaf litter that sits on or near the surface when snow is gone, and from the deeper subsoil below the root zone.

The subnivium is the insulating microhabitat under a snowpack, the space between the snow and the soil surface. Snow acts as a blanket, dampening temperature swings and keeping this zone relatively stable and moderately cold, which allows soil-dwelling organisms to persist through winter. This habitat supports creatures like many soil invertebrates and microbial life that would struggle with exposed freezing above ground. It’s distinct from the forest canopy high above, from the upper leaf litter that sits on or near the surface when snow is gone, and from the deeper subsoil below the root zone.