Population
The term is also applied to non-human animals, microorganisms, and plants, and has specific uses within such fields as ecology and genetics.[citation needed] In ecology, a population is a group of organisms of the same species which inhabit the same geographical area and are capable of interbreeding.This failure of panmixia leads to two important changes in overall population structure: (1) the component gamodemes vary (through gamete sampling) in their allele frequencies when compared with each other and with the theoretical panmictic original (this is known as dispersion, and its details can be estimated using expansion of an appropriate binomial equation); and (2) the level of homozygosity rises in the entire collection of gamodemes.[10] According to papers published by the United States Census Bureau, the world population hit 6.5 billion on 24 February 2006.[12] Researcher Carl Haub calculated that a total of over 100 billion people have probably been born in the last 2000 years.[17] In the future, the world's population is expected to peak at some point,[18] after which it will decline due to economic reasons, health concerns, land exhaustion and environmental hazards.[21] The population pattern of less-developed regions of the world in recent years has been marked by gradually declining birth rates.
0–350/km 2 is low
350–700/km 2 is medium
700+/km 2 is high
Population (disambiguation)censusanimalsmicroorganismsplantsecologygeneticsLate LatinDemographysociologypopulation geographyethnicitynationalityreligionPopulation ecologyorganismsspeciesgeographical areainterbreedingsexualcross-breedinghumansracialLincoln indexPopulation dynamicsdynamical systemsPopulation geneticsbreedingallelegametezygotequadratic equationRonald Fisherpanmixiabinomial equationanimal breedingWorld populationDemographics of the worldUnited Nations Population FundNigeriaPopulation growthIndustrial RevolutionGreen RevolutionUnited Nations Population Divisiondemographic transitionHuman population planningenvironmental degradationreproductive rightshuman rightsCommunity (ecology)Human overpopulationList of countries by populationLists of organisms by populationPopulation ethicsSinauer AssociatesOxford University PressHeredityHereditasWayback MachineBibcodeEncyclopædia BritannicaDavid R. HendersonConcise Encyclopedia of EconomicsLibrary of Economics and LibertyEstimates of historical world populationPopulation momentumProjections of population growthPopulationbiologyPopulation declinePopulation densityPhysiological densityPopulation modelPopulation pyramidPopulationecologyBiocapacityCarrying capacityI = P × A × TKaya identityMalthusian growth modelOvershoot (population)World3 modelEugenicsDysgenicsMalthusian catastropheCompulsory sterilizationFamily planningOne-child policyTwo-child policyOverconsumptionPolitical demographyAntinatalismMere addition paradoxNatalismNon-identity problemSustainable populationZero population growthPopulation and EnvironmentPopulation and Development ReviewPopulation and housing censuses by countryLargest citiesWorld population milestones6 billionPopulation concern organizations7 Billion ActionsChurch of EuthanasiaInternational Conference on Population and DevelopmentPopulation Action InternationalPopulation ConnectionPopulation MattersUnited Nations world population conferencesVoluntary Human Extinction MovementWorld Population ConferenceWorld Population DayWorld Population FoundationBennett's lawHuman impact on the environmentMigrationSustainabilityLists of countriespopulation statisticsGlobalCurrent populationUnited NationsContinents/subregionsAfricaAntarctica