Natality Mortality Immigration Emigration

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.

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

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 emmigration Key terms: population, sigmoid, lag, log, natality, mortality YearNumber of individuals

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

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.

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.