Community ecology studies the structure and dynamics of animal and plant communities. Population ecology provides modeling tools that can be used for predicting community structure and dynamics. Population genetics studies gene frequencies and microevolution in populations. Selective advantages depend on the success of organisms in their survival, reproduction and competition. And these processes are studied in population ecology.
Evolutionary ecology is one of the major topics in population biology.
Systems ecology is a relatively new ecological discipline which studies interaction of human population with environment. One of the major concepts are optimization of ecosystem exploitation and sustainable ecosystem management. Landscape ecology is also a relatively new area in ecology. Population dynamics can be studied at the landscape level, and this is the link between landscape- and population ecology. In genetics a population is a group of interbreeding individuals of the same species, which is isolated from other groups.