Population

=== Ecology ===
{{main|Population ecology}}
In [[ecology]], a population is a group of [[organism]]s of the same [[species]] who inhabit the same particular [[geographical area]] and are capable of [[Sexual reproduction|interbreeding]].<ref>{{cite web |title=Population |url=http://www.biology-online.org/dictionary/Population|publisher=Biology Online |access-date=5 December 2012}}</ref><ref>{{cite web |title=Definition of population (biology) |url=http://oxforddictionaries.com/definition/english/population?q=population |archive-url=https://web.archive.org/web/20130510042807/http://oxforddictionaries.com/definition/english/population?q=population |url-status=dead |archive-date=10 May 2013 |work=Oxford Dictionaries |publisher=Oxford University Press |access-date=5 December 2012 |quote=a community of animals, plants, or humans among whose members interbreeding occurs}}</ref> The area of a [[sex]]ual population is the area where [[interbreeding|inter-breeding]] is possible between any pair within the area and more probable than [[Crossbreed|cross-breeding]] with individuals from other areas.<ref>{{cite book | last=Hartl | first=Daniel | title=Principles of Population Genetics | publisher=[[Sinauer Associates]] | year=2007 | isbn=978-0-87893-308-2 | page=45}}</ref>

In ecology, the population of a certain species in a certain area can be estimated using the [[Lincoln index]] to calculate the total population of an area based on the number of individuals observed.

==== Dynamics ====
{{excerpt|Population dynamics}}