STARTER: Group Activity1. Can you describe the graph2. Can you explain the shape of the graph? (Hint: what vocabulary have you learnt that could support your answer!)

Learning outcomesAll 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-curveExponential 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.

CARRYING CAPACITY

Transitional phase

Population growthCompare the 2 curvesWhy is there a difference? LIMITING FACTORS WHICH SET THE CARRYING CAPACITY!!!

Checking learning outcomesGet 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-curve2. 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 toadBufo marinusin Australia

Bufo marinus population

Explosion–crash cycle