1. Energy in Ecosystems

2. Against the clock!
Using the cards at your table produce as many different food chains as you can in 3mins!

3. Energy in Ecosystems Title Page...
P.S. Make a note of one of your food chains on the next page.

4. Now try a food web...

5. Match the words to organisms in your food web..
Predator
Primary Consumer
Producer
Omnivore
Herbivore
Secondary Consumer
Carnivore
Prey

6. Now try....
The Questions on page 17 of Torrance.

7. Why be a vegetarian? and Why your mum told you to eat your greens?!!

8. Watch this clip... Can you see a food chain?
Can you see a food chain?

9. Energy Loss In a food chain energy is passed on from
one organism to another.
1000 units of energy
At each stage in a food chain only about
10% of the energy is passed on.

10. Energy Loss 90% of the energy is lost as Heat Movement
Undigested Material

11. So, why be a vegetarian?

12. Pyramid of Numbers
Green Plants
Slug
Frog
Fox
What happens to a) The size of and b) The no. of organisms as you go along the food chain?

13. Pyramid of Numbers
A pyramid of numbers can be used to show the number of organisms at each stage of a food chain.
Small numbers of large organisms
1 fox
30 Rabbits
100,000 blades of grass
Large numbers of small organisms

14. GREEN FLY Sometimes a pyramid of numbers is not accurate. e.g.
Ladybird
BlackBird
Rose Bush
BLACKBIRD
LADYBIRD
GREEN FLY
ROSE BUSH
A more accurate way to explain this food chain would be to weigh all the organisms at each level.
The result is a PYRAMID OF BIOMASS.

15. Pyramid of Biomass
Small biomass
This shows the total mass of living organisms at each stage of the food chain.
1g/m2 fox
30 g/m2 Rabbits
100,000g/m2 blades of grass
Large biomass

16. Pyramid of Energy
Less energy
This shows the total energy at each stage of the food chain.
1 kJ fox
30 kJ Rabbits
100,000 kJ blades of grass
Lots of energy

17. Quiz time!

18. Food Webs

19. What will happen if the barnacles are removed?

20. What will happen if the barnacles are removed?
There will be fewer Blenny
There will be more zooplankton

21. What will happen if the dog whelks are removed? Why?

22. What will happen if the dog whelks are removed?
There will be fewer Crabs
As they will have less food

23. What will happen if the dog whelks are removed?
There will be more limpets and mussels
As they will not be eaten by dog whelks

24. What will happen if the dog whelks are removed?
There will be fewer Periwinkles
As the crabs will have to eat more of them

25. Choose another organism, and explain the consequences of it was removed

26. Monster Crab Invasion!

27. What do organisms compete for in their environments?
Animals Plants
WFS
WLN

28. Plants compete for water, light and soil nutrients

29. Animals compete for water, food and shelter

30. Types of Competition
Interspecific competition – occurs between individuals of different species.
Intraspecific competition – competition between members of the same species.

31. Competition Investigation
What factors might affect how well seeds germinate?