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School
University of British Columbia
Department
Biology
Course
BIOL 111
Professor
Lynn Norman
Semester
Fall

Description
A Growing Human Population Ecology is the field of biology that focuses on the interactions among organisms as well as between them and their environment Population is defined as all of the individuals of a species within a given area Population exhibits a structure which includes the spacing of individuals and their density which enable ecologists to assess factors that lead to populations success or failure Population Structure The size of a population is determined by markrapture method In this method they capture organisms theymarkthemandthenreleasethemSometimelatertheyrecaptureandcalculatethepercentageofthemarkedorganismswhichthenenablesthemtocalculatethewholepopulationAnotheraspectofpopulationsstructureisdispersionhoworganismsaredistributedinspaceManyorganismsshowaclumpeddistributionhighdensitiesoforganismsinresourcerichareasandlowdensitieselsewhereHumansclumpedhighdensitiesalongtransportationroutesFactorsattractspeciesUniformdistributionisevenlyspacedUniformdistributionsarefoundinpopulationsinwhichthedistancebetweenneighbouringindividualsismaximizedTheneedtomaximizethespacebetweenindividualsgenerallyarisesfromcompetitionforaresourcesuchasmoistureornutrientsorasaresultofdirectsocialinteractionsbetweenindividualswithinthepopulationsuchasterritorialityFactorsrepelspeciesNeitherattractednorrepelledrandomdistributionusuallyhappenstospeciesthatarenotsocialandhavetheabilitytotolerateawiderangeofconditionsDistributionspacingandAbundanceDensityhelpsustogetasnapshotofpopulationPopulationGrowthAnOverviewRateofpopulationgrowth1277millionpeopleperyearLargedifferencesbetweenbirthratesanddeathrateiswhathascausedhighgrowthrateinpopulationoftheworldIttakes58yearsfortodayspopulationtodoubleinsizeTheDemographicTransitionAdvancingintreatingandpreventinginfectiousdiseasehasreducedthenumberofchildrenwhodiefromillnessesPage1
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