1. FOOD CHAINS & FOOD WEBS

2. Relationships exist in order for one or both organisms to get food (energy)
Sunlight is the main energy on earth

3. Consumers (heterotrophs) = acquire energy from other organisms
Producers (autotrophs) = produce their own food; get energy from sunlight
Consumers (heterotrophs) = acquire energy from other organisms
Examples: Herbivores = eat plants
Carnivores = eat animals
Omnivores = eat plants and animals
Decomposers = feed on decaying/dead matter; return organic compounds back to soil

4. Herbivore
Carnivore
Omnivore
Decomposers

5. Energy (food) is passed from organism to organism through food chains & food webs
Food Chain = a series of steps in which organisms transfer energy by eating & being eaten
Food Web = links all the food chains in an ecosystem together

6. Trophic Level = each step in a food chain or food web
*1st trophic level is always a producer
**2nd trophic levels and up are consumers

7. T1 = Producer
T2 = Primary consumer
T3 = Secondary Consumer
T4 = Tertiary Consumer
T5 = Upper Level Consumer

8. EXAMPLE FOOD CHAIN
The arrows point in the direction that ENERGY is moving!

9. SAMPLE FOOD WEB

11. Homework
Chapter 2 - Section 1 & 2 Worksheet
Due Tues., Oct 6