Presently two main sub-divisions of ecology are the following:
This branch of ecology studies an individual organism including its life history and behaviour as a means of adaptation to the environment. Such a study may be concerning an animal, a plant or an aquatic plant etc.
This branch of ecology is concerned with the study of a group or groups of organisms which form a unit.
Synecology is further sub-divided in the following:
(a) Population ecology
(b) Community ecology
(c) Ecosystem ecology