View
213
Download
0
Category
Preview:
Citation preview
PopulationsPopulations
Population Population
Population is a group of organisms of the same species in an area.
To define a population you need to knowType of individualThe timeThe place
Population is a group of organisms of the same species in an area.
To define a population you need to knowType of individualThe timeThe place
Features of Population
Features of Population
Migration; movement of organisms into and out of the population.
Population Distribution and Abundance; density, distribution and total abundance.
Population Dynamics; population growth rate, Natality, mortility
Population composition; sex ratio, population fertility, age structure.
Migration; movement of organisms into and out of the population.
Population Distribution and Abundance; density, distribution and total abundance.
Population Dynamics; population growth rate, Natality, mortility
Population composition; sex ratio, population fertility, age structure.
Population Distribution And abundence
DensityDistribution
Total abundance
Population Composition
Sex ratiosPopulation fertility
Age structure
MigrationMovement of individuals into and out of the population
Population DynamicsPopulation growth rate, natality, mortility
Population Distribution and
Abundance
Population Distribution and
AbundanceDensity; the number of organisms per unit area.
Distribution; the locations of individuals within an area.
Total Abundance; the total number of organisms.
Density; the number of organisms per unit area.
Distribution; the locations of individuals within an area.
Total Abundance; the total number of organisms.
Population CompositionPopulation Composition
Sex ratios; the number of organisms of each sex.
Population fertility; the reproductive capacity of the females.
Age structure; the number of organisms of different ages
Sex ratios; the number of organisms of each sex.
Population fertility; the reproductive capacity of the females.
Age structure; the number of organisms of different ages
Population Dynamics;Population Dynamics;
Natality (Birth Rate)Mortility (Death rate)
Natality (Birth Rate)Mortility (Death rate)
NatalityNatality
Natality is the number of birth per 1000 people per year.
Crude birth rate = # of births per yr X1000
total population
Natality is the number of birth per 1000 people per year.
Crude birth rate = # of births per yr X1000
total population
Mortility RateMortility Rate
Mortility rate is the number of deaths per 1000 people a year
In humans this is; Crude death rate= Number of death per yr x1000 total population
Mortility rate is the number of deaths per 1000 people a year
In humans this is; Crude death rate= Number of death per yr x1000 total population
Population Growth RatePopulation Growth Rate
Births - Death + Immigration- Emigration
Births - Death + Immigration- Emigration
Population RegulationPopulation Regulation
Often populations are not able to continually increase in size.
Population sizes are regulated by many different factors
Often populations are not able to continually increase in size.
Population sizes are regulated by many different factors
Population regulationPopulation regulation
Density dependent Food supply Disease Competition Predation
Density dependent Food supply Disease Competition Predation
Density independent Rainfall Temperature Salinity Catatrophic events
Density independent Rainfall Temperature Salinity Catatrophic events
Recommended