1. March 10, 2014 1. What was your favorite animal from the field trip? 2. What did you think of the movie?

2. Ch. 22.1

3. Energy Roles An organism’s energy role is determined by how it obtains energy and how it interacts with other organisms. Each organism fills a different energy role:

4. Producers The largest source of energy on Earth is the SUN! Some organisms, such as plants, algae, and some bacteria, capture the sunlight and turn it into energy. This process is called Photosynthesis: – Photo - Light – Synthesis - to make

5. Photosynthesis

6. Producer An organism that makes its own food is called a producer. They are the first step in all food chains and webs.

7. Consumers When an organism can’t make its own food, it has to eat other organisms. When you eat another organism, you are a consumer. You CONSUME your energy. – Consume = EAT!

8. Different Consumers There are different kinds of Consumers: – Herbivores – eat only plants (herbs) – Carnivores – eat only animals (carn = meat) – Omnivores – eat both plants and animals (omn = everything) – Scavenger – its dead bodies. Examples: catfish and vultures

9. Decomposers If an ecosystem had only producers and consumers, the raw materials would stay locked up in wastes and the bodies of dead organisms. Decomposers break down wastes and dead organisms back into their original parts. – Fungi, Mushrooms, bacteria, etc.

10. Food Chains and Food Webs The movement of energy through an ecosystem can be shown in diagrams called food chains and food webs.

11. Food Chains A food chain is a series of events in which one organism eats another and obtains it’s energy. It is a simple, linear diagram.

12. Food Webs But nature isn’t simple and linear. A food web shows how ALL the different food chains link up and form complex webs of chains:

13. Energy Pyramid When an organism eats, it obtains energy. BUT! Not all of the energy it eats is kept. Most of it is lost because organisms move, grow, reproduce, etc.

14. An energy pyramid shows the amount of available energy in each level. As you go up the levels, less and less energy is available.

15. Energy Pyramid In general, only about 10% of the energy at one level is transferred to the level above it. 90% of the energy is USED by that organism to live, grow, reproduce, etc. This means the top organisms has to EAT a LOT MORE than the guy below him.