LO: Learn how to interpret population curves.

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Presentation transcript:

LO: Learn how to interpret population curves. Keywords: Predator Prey Cycle Population Curves Lifelines: WRITING: W2, W4 TALKING: T2, T5 LO: Learn how to interpret population curves. Learning challenges: Use data to describe the relationship between predator and prey. Explain why predator and prey numbers rise and fall in cycles. Suggest why there is a time delay before the numbers of predator increase.

Predator-prey populations How does the lynx population depend on the number of snowshoe hares? 50 estimated population size (thousands) 1800 1820 1840 1860 1880 1900 100 150 year lynx snowshoe hare Take a closer look at this part of the graph.

Predator-prey populations Why does the peak for the lynx population always come after the peak for the number of snowshoe hares? snowshoe hare 150 lynx For the populations to survive, there must always be more hares than lynxes 100 estimated population size (thousands) 50 1845 1850 1855 1860 1865 year

Population Curves Rabbit Fox Population of animal Time / months C A B Match the statements to parts A B or C on the graph. As the population of predators decreases the population of rabbits increases, as less rabbits are being eaten. The population of predators increases at a slower rate because they rely on the prey for energy. When the population of foxes peaks, there isn’t enough prey to sustain the population. This causes the number of rabbits to sharply decrease.

Population Curves Look at the graph carefully and answer the following questions: Name the prey and predator shown by this graph (1 mark) Prey:…………….. Predator:…………….. Use the graph to explain the predator-prey relationship shown. (3 marks) 1 mark – the population of plant plankton increases/more of them 1 mark - the number of animal plankton rises because there is more food available to them 1 – mark – the animal plankton population falls as they compete for the limited amount of plant plankton

Independent Task Peer assessment task: Purple Pen Reflection: Complete the worksheet on slugs and toads. Peer assessment task: Comment on the use of keywords (W2) Has the work been explained in detail (T5) – highlight an example of this Comment on the spelling of key words (W4) Purple Pen Reflection: Why do the numbers of predators and prey rise and fall in cycles?