Define the following:

Natality

Mortality

Immigration

Emigration

What factors affect population?

Natality

Mortality

Immigration

Emigration

Ratio of the number of births to population size

Ratio of the number of deaths to population size

Movement of an organism into an area permanently.

Movement of an organism out of an area permanently.

What factors affect population?

Objectives

Draw a population sigmoid population curve.

Explain the different stages seen.

Outcomes

3: Draw a growth curve and label the stages using data.

5: Link limiting factors to the stages.

7: Explain what is happening at each stage in terms of natality,

mortality, immigration and emmigration

Key terms: population, sigmoid, lag, log, natality, mortality

What factors affect population?

Using the data provided draw a graph with all necessary features to show the pattern.

Label each stage (Log / exponential, stationary, lag)

Identify what the limiting factors are in each stage.

Explain why each stage looks the way it does linking to natality, mortality, imigration

and emmigrationKey terms: population, sigmoid, lag, log, natality, mortality

Year Number of individuals1900 191910 321920 511930 1031940 2021950 3001960 4511970 6481980 7101990 7212000 7222010 721

What factors affect population?

Key terms: population, sigmoid, lag, log, natality, mortality

What factors affect population?

What factors limit population growth?

Outcomes

3: Draw a growth curve and label the stages using data.

5: Link limiting factors to the stages.

7: Explain what is happening at each stage in terms of natality,

mortality, immigration and emmigration

Key terms: population, sigmoid, lag, log, natality, mortality

Factors can be top down (predators) or bottom up.

What factors affect population?

How can we estimate population sizes?

What about for a large area like an ocean when looking at commercial fish stocks?

Outcomes

3: Draw a growth curve and label the stages using data.

5: Link limiting factors to the stages.

7: Explain what is happening at each stage in terms of natality,

mortality, immigration and emmigration

Key terms: population, sigmoid, lag, log, natality, mortality

Fish catch data very useful:

Look at numbers and ages to see spawning rate then

estimate a total.