Population ecology is a major sub-field of ecology that deals with the dynamics of species populations and how these populations interact with the environment. Ecology (from Greek grc οἶκος oikos, "house(hold" and grc -λογία -logia) is the scientific study of In Biology, a species is one of the basic units of Biological classification and a Taxonomic rank. In Biology a population is the collection of inter-breeding organisms of a particular Species; in Sociology See also Nature The natural environment, commonly referred to simply as the environment, is a terminology that is comprised of all living and 
The older term, autecology (from Greek: αὐτο, auto, "self"; οίκος, oikos, "household"; and λόγος, logos, "knowledge") refers to the roughly same field of study, coming from the division of ecology into autecology—the study of individual species in relation to the environment—and synecology—the study of groups of organisms in relation to the environment—or community ecology. Community ecology is a subdiscipline of Ecology which studies the distribution abundance Demography, and interactions between coexisting Populations Odum (1959, p. 8) considered that synecology should be divided into population ecology, community ecology, and ecosystem ecology, defining autecology as essentially "species ecology. " However, biologists have for some time recognized that the more significant level of organization of a species is a population, because at this level the species gene pool is most coherent. In fact, Odum regarded "autecology" as no longer a "present tendency" in ecology (i. e. , an archaic term), although included "species ecology"—studies emphasizing life history and behavior as adaptations to the environment of individual organisms or species—as one of four sub-divisions of ecology. The term life history has been given many meanings in several scientific fields
The development of the field of population ecology owes much to the science of demography and the use of actuarial life tables. Demography is the statistical study of all Populations. It can be a very general science that can be applied to any kind of dynamic population that is one that changes over An actuary is a business professional who deals with the financial impact of risk and uncertainty In Actuarial science, a life table (also called a mortality table or actuarial table) is a table which shows for a person at each age what the probability Population ecology has also played an important role in the development of the field of conservation biology especially in the development of population viability analysis (PVA) which makes it possible to predict the long-term probability of a species persisting in a given habitat patch (e. "Conservation Biology" redirects here For the Scientific journal, see Conservation Biology (journal. Population viability analysis (PVA is a Species -specific method of Risk assessment frequently used in Conservation biology. g. , a national park).
While essentially a subfield of biology, population ecology provides many interesting problems for mathematicians and statisticians, which work mainly in the study of population dynamics. Foundations of modern biology There are five unifying principles Mathematics is the body of Knowledge and Academic discipline that studies such concepts as Quantity, Structure, Space and Statistics is a mathematical science pertaining to the collection analysis interpretation or explanation and presentation of Data. Population dynamics is the study of marginal and long-term changes in the numbers individual weights and age composition of individuals in one or several Populations and
Scientific literature on population ecology can be found in The Journal of Animal Ecology, Oikos and others. This article is about ancient Greek households For the ecology journal see Oikos (journal.