Population ecology is the study of how populations — of plants, animals, and other organisms — change over time and space and interact with their environment. Populations are groups of organisms of ...

The United States has enjoyed some level of population growth virtually every year for more than a century. But that doesn't mean every state is always growing in lockstep. Here's a for-instance: ...

SIOUX FALLS, S.D. (KELO) — Migration, including foreign-born and domestic persons, is helping to drive population increases in South Dakota. In some counties in South Dakota, the foreign-born ...