What does subnivean mean?

Answer 1

Subnivean refers to all lifeforms that can survive, and live actively, beneath the snow. Microfauna and flora may persist in the tiny spaces between frozen blades or grass, or in the case of Polar bears and northern seals, may inhabit larger pockets or burrows in the snow.

Answer 2

"Subnivean" refers to the space or habitat under the snow layer, where small animals can find shelter and insulation during the winter months. It is a region where temperatures are more stable and offer protection from extreme weather conditions.