Predator prey relationships

LO: investigating changing populations by looking at

predator/prey relationships

1. Write down whether each one is a predator or prey. 2. For each of the animals, write down two adaptations that it has for either catching prey or avoiding being eaten.3. Name two adaptations that many predators have for catching and killing prey.4. Name two adaptations that many prey have to avoid being eaten.

http://www.youtube.com/watch?v=pgvsQ6oNZyo

• Great white shark attack

• Killer whales attacking seals

• Lions and zebra

• Zebra and croc

• Killer whale and grey whale

• Tiger shark and albatross

• Python and antelope

Lynx and snowshoe hare

Year Lynx population

(thousands)

Snowshoe hare

population (thousands)

1985 40 20

1986 30 35

1987 10 80

1988 50 60

1989 70 30

1990 5 90

1991 90 30

1992 10 5

1993 30 100

1994 120 20

1. Draw a line graph of this data2. Which is the predator and which is the prey?2. What might increase the hare population?3. What might decrease the hare population?

Year

Pop

ulat

ion

(tho

usan

ds)

8D A few words to check

Can you match each word to its definition?

Carnivores

Consumers

Producers

Herbivores

Omnivores

Animals that eat plants and animals.

Organisms that build food using energy from sunlight.

Animals that only eat plants.

Organisms that cannot make food by photosynthesis.

Animals that only eat animals.

Animals that only eat animals.

Organisms that cannot make food by photosynthesis.

Organisms that build food using energy from sunlight.

Animals that only eat plants.

Animals that eat plants and animals.

A food web shows the relationship between organism in an habitat. The arrows show what eats what and the flow of energy

Battle at krugarhttp://www.youtube.com/watch?v=LU8DDYz68kM

http://www.youtube.com/watch?v=Qqa0OPbdvjw

Write down the longest food chain you can see in this food web

• Write down a food chain from this video

• Whale shark and krill

Mr Gaynor

compost

Make a food chain

Mr Gaynor

compost

1. Here are three food chains:• A grass rabbit fox• B wheat field mouse fox• C wheat field mouse grass snake1 Sketch a pyramid of numbers for food chain A.2 Use all three food chains to draw a food web.3 Name one producer in the food web. 4 Name a primary consumer. 5 Name a secondary consumer. a If the field mice died, what would happen to the

number of grass snakes?b Why would this happen?c If the field mice died, what might happen to the

number of rabbits?d Why might this happen?

Symbiosis- buffalo, birds and bacteriaParasitic mind control• http://www.youtube.com/watch?

v=lGSUU3E9ZoM&feature=fvst• http://www.youtube.com/watch?v=rLtUk-

W5Gpk&feature=fvstZombie snailshttp://www.youtube.com/watch?

v=EWB_COSUXMwBody invaders http://www.youtube.com/watch?

v=vMG-LWyNcAs

Summary

Learning Logs:

On your book answer 3 of the following statements:

1. In the lesson I learnt….

2. I was surprised by….

3. One thing I liked most about today was….

4. The main thing I want to know more about is…..

5. I was interested in……

6. One thing I’m not sure about is…..

•http://www.youtube.com/watch?v=tzSvEw4W16U