Natural resource population dynamics examines how environmental factors influence changes in population numbers and composition over time. Bobwhite quail populations have severely declined over 50 years primarily due to loss of agricultural habitat. Quail need early succession habitat for nesting cover and brood ranges. Wildlife biologists track population changes of species of concern by counting calls and roadside surveys. Population dynamics are influenced by factors like density, birth rates, mortality rates, dispersal, age structure, sex ratios, and resource limitations.