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