What biological necessity forces woodlice to remain in high humidity areas?

Answer

Primitive, gill-like respiratory structures

The defining factor governing woodlouse habitat selection is their respiratory system. They possess structures described as primitive and gill-like, which mandate continuous moisture exposure to operate correctly. Dry air causes these structures to fail or desiccate rapidly, posing an immediate threat to survival. This essential biological constraint ensures that wherever woodlice congregate, the local microclimate exhibits high humidity levels, as they must remain sheltered from direct evaporation caused by wind or sun exposure throughout the day.

What biological necessity forces woodlice to remain in high humidity areas?
locationhabitatarthropodwoodlouseisopod