Population/ Limiting Factors

State StandardsState Standards

Learning TargetsLearning Targets

I will be able to determine the size of a population.

I will be able to describe population limiting factors.

I will be able be able to explain causes in population size.

I will be able to determine the size of a population.

I will be able to describe population limiting factors.

I will be able be able to explain causes in population size.

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What is a population? Provide Examples

What is a limiting factor? Provide Examples

What is a population? Provide Examples

What is a limiting factor? Provide Examples

Carrying CapacityCarrying Capacity

Carrying Capacity -The number of organisms an

ecosystem can support or sustain

Carrying Capacity -The number of organisms an

ecosystem can support or sustain

PopulationsPopulations

Population - All the members

of one species in a specified area

Population

Population - All the members

of one species in a specified area

Population

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Population DensityPopulation Density

Population Density - The number of

individuals in a specified area

Example = If you count 50 monarch butterflies in a garden measuring 10 square meters, then the population density

Population Density - The number of

individuals in a specified area

Example = If you count 50 monarch butterflies in a garden measuring 10 square meters, then the population density

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Determining Population Size

Determining Population Size

There are four ways to determine population size

#1 Direct Observation -Count one by one#2 Indirect Observations -An animal may be to small to determine

the size of the population. So you may need to count tracks or other signs like nest.

There are four ways to determine population size

#1 Direct Observation -Count one by one#2 Indirect Observations -An animal may be to small to determine

the size of the population. So you may need to count tracks or other signs like nest.

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Determining Population Size

Determining Population Size

#3 Sampling-Estimating involves counting the

number of organisms in a small area and then multiplying to find the number in a larger area

#4 Mark-and Recapture -

#3 Sampling-Estimating involves counting the

number of organisms in a small area and then multiplying to find the number in a larger area

#4 Mark-and Recapture -

Changes in Population SizeChanges in Population Size

Adding to a Population #1 way to increase a

population’s size is to reproduce/ birth of offspring

Birth Rate - The number of births

in a certain period of time

Immigration- moving into a population

Adding to a Population #1 way to increase a

population’s size is to reproduce/ birth of offspring

Birth Rate - The number of births

in a certain period of time

Immigration- moving into a population

Decreasing the size of a Population

Deaths Rate- The number of

deaths in a certain period of time.

Emigration - Leaving a population

Decreasing the size of a Population

Deaths Rate- The number of

deaths in a certain period of time.

Emigration - Leaving a population

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Population Limiting Factors

Population Limiting Factors

Some Population limiting factors are;

Food - Organisms require food to survive. In an area where food is scarce, this becomes a limiting factor.

Space - Organisms need space for homes and to find food.

Some Population limiting factors are;

Food - Organisms require food to survive. In an area where food is scarce, this becomes a limiting factor.

Space - Organisms need space for homes and to find food.

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Population Limiting Factors

Population Limiting Factors

Weather - Weather conditions such as temperature and amount of rainfall can also limit population growth.

Predation - one organism killing and eating another

Weather - Weather conditions such as temperature and amount of rainfall can also limit population growth.

Predation - one organism killing and eating another

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Carrying CapacityCarrying Capacity

Carrying Capacity - The number of organism an

ecosystem can support or sustain

Carrying Capacity - The number of organism an

ecosystem can support or sustain

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