Population density is often used as a simple relative measure of how an organism responds to local conditions.
If conditions are not good for the species, the density will be low (organisms will have died or moved out of the sampled area), whereas if conditions are good the density will be high (organisms will have reproduced and/or immigrated into the area).
In this way, changes in density can provide insight into the natural history of the preferences and tolerances of individuals of the species.
Of course, if the species is regulated by density-dependent processes then the relationship of density with the attractiveness of the environment can be obscured. Even though the environment changes in a positive way, there may be no increase in density.
- State has high density of population — Bihar (1102) Refer 2011 Census
- State has low density of population — Arunachal Pradesh (17)
The density of population is a crude measure of human and land relationship.
- Physiological density = total population / net cultivated area.
- Agricultural density = total agricultural population / net cultivable area.
Agricultural population includes cultivators and agricultural labourers and their family members.