Crude density is defined as density per unit of:
“Total space” for crude density is defined as density per unit of. This relationship follows from the ecological mechanism represented by the terms in the item, not merely from an association between their names. Mechanistic support comes from showing how resource limitation, enemies, mate availability, or physiological stress changes demographic performance. A descriptive association alone does not establish regulation or causation. The remaining alternatives—“Habitat area”, “Ecological space”, “Suitable niche space”—refer to different states, processes, or scales and therefore do not express
Ref: Campbell Biology, Urry et al., 12th Ed., Unit 8 Ecology
