STARTER: Group Activity 1. Can you describe the graph 2. Can you explain the shape of the graph? (Hint: what vocabulary have you learnt that could support.

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Presentation transcript:

STARTER: Group Activity 1. Can you describe the graph 2. Can you explain the shape of the graph? (Hint: what vocabulary have you learnt that could support your answer!)

Learning outcomes All of you will be able to: Describe S and J population curves Most of you should be able to: Explain the concepts of limiting factors and carrying capacity in the context of population growth. Sketch and construct population curves from given data. Some of you might be able to: Interpret population curves.

Population Growth J-curve Exponential growth THINK: What is happening? Why is this IMPROBABLE!

S-curve THINK: Why is this a more realistic model of population growth? Use the terms carrying capacity and limiting factors in your description. Transitional phase

Population growth Compare the 2 curves Why is there a difference? LIMITING FACTORS WHICH SET THE CARRYING CAPACITY!!!

Checking learning outcomes Get out your learning outcome booklets… Who thinks they could describe the S and J curves? Who thinks they could now sketch and explain their own S and J curves?

Let’s do it… 1. Sketch and label a graph of an S-curve and a J-curve 2. Write a short paragraph for each graph -explaining the shape -using the concepts of limiting factors and carrying capacity Be ready to swap it with your neighbour!

An example of exponential growth cane toad Bufo marinus in Australia

Bufo marinus population

Explosion–crash cycle