Population/ Limiting Factors

State Standards

Learning 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.

QW: #8  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 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

Populations  Population -  All the members of one species in a specified area  Population Population  Population -  All the members of one species in a specified area  Population Population

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  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

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.

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 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

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.

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

Carrying 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