1. Aim: How do we illustrate feeding relationships and trace the path of energy in a marine ecosystem?

2. Food Webs
Food chains and food webs show the flow of energy through an ecosystem or “what eats what” 2

3. Food Webs
Energy –
the ability to cause change
Different organisms have different ways of obtaining energy
Heterotrophs
Autotrophs 3

4. Consumers (Heterotrophs)
Organisms are divided into Categories
Organisms
Consumers (Heterotrophs)
Producers (plants)

5. Producers Autotrophs are plants “self-feeders”
Photosynthetic organisms
They automatically make their own food and produce food energy for most all other living things

6. -Phytoplankton form the basis of the marine food web -Why the ocean is green in color 6

7. Consumers Can’t make their own food (heterotrophs) Types of consumers:
Herbivores: eats only plants
Carnivores: eats only animals
Omnivores: eats both

8. Order of consumers Must acquire food by consuming other organisms
Primary consumers
Secondary consumers
Tertiary consumers

9. Primary consumers herbivores that consume producers
examples are terrestrial insects, snails, grazing fish, seed-eating birds

10. Secondary consumers These are the carnivores/omnivores
Eat primary consumers
examples of this group include frogs, insects-eating birds, many fish

11. Tertiary consumers These are the carnivores that eat other carnivores
Eat secondary consumers

12. Decomposers
Decomposers – feed on decaying matter, break it down chemically
Make nutrients available to plants so it can cycle through food web again

13. Energy transfer illustrate in an Energy Pyramid
3’ Consumers
2’ Consumers
Energy Flow
1’ Consumers
Producers

15. Food Chains Shows feeding relationships among organisms
The transfer of energy from one organism to another is illustrated in a food chain

17. Food Webs
Many interconnected food chains that show the feeding relationships among producers, consumers, and decomposers

18. Create a food web!

19. Why is biodiversity important?
What happens
If insecticide
Is sprayed?
All living things are interdependent on one another

22. Aim: How does symbiosis in the ocean occur?

23. Symbiotic Relationships
Close interaction b/w species where one lives in or on the other
Three different types of symbiotic relationships
Can you think of one?
1. Parasitism
2. Mutualism
3. Commensalism

24. 1. Parasitism
One organism obtains its food at the expense of another organism…the host (+,-)

25. http://www. youtube. com/watch. v=QQWgUht-ObI http://www. youtube

26. 2. Mutualism Both organisms benefit form the symbiotic relationship
Clown fish in anemone (+,+)

28. 3. Commensalism
One organism benefits, while the other is not harmed or helped. (+,0)
By lodging on the whale, barnacles are transported to new sources of food.) The presence of barnacle populations does not appear to hamper or enhance the survival of the animals carrying them.