Populations of wild animals are constantly in a changing state. Over the course of a single year, a local population of deer (or elk, or squirrels, or even catfish) will experience periodic increases as young are born (or hatched) or new individuals travel in from another region. Within that same year, that population may experience decreases from death due to harvest or natural causes and individuals leaving the area in search of a new home.
This constant ebb and flow in the number of individuals, and the age structure of the local community, is known by wildlife biologists as population dynamics.....
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Understanding Wildlife Biology: Population Dynamics 101 | Outdoor Life
