Energy Flow

• Two main types of organisms
• Producers
• Autotrophs- organisms that use energy from the sun or energy stored in chemical compounds to manufacture food.
• Consumers
• Heterotrophs- organism that depend directly or indirectly on autotrophs as their source of nutrients and energy.
• Herbivores are heterotrophs that eat producers.
• Carnivores are heterotrophs that eat other heterotrophs.
• Scavengers- feed on carrion, refuse, and dead organisms.
• Omnivores are heterotrophs that eat producers and other heterotrophs.
• Decomposers are organism that break down compounds in dead/decaying plants and animals.

Energy Flow

• Food chains are linear steps to show how matter and energy move through an ecosystem by eating or being eaten.
• Trophic level represents a feeding step in a food chain (each level eats the level before it).
• Level 1: Producers
• Level 2: Primary consumer (1^st)
• Level 3: Secondary consumer (2^nd)
• Level 4: Tertiary consumer (3^rd)
• Level 5: Quaternary consumer (4^th)
• ALL ENERGY is passed in ONE DIRECTION!!!!

Name a carnivore.

Identify an herbivore.

Which is the primary consumer?

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Which is a producer?

Which is a secondary consumer?

What trophic level is the otter?

Otter and Trout

Crustaceans

Crustaceans

Plankton

Trout

Fourth

What level is it?- tree, bear, deer, owl, and fish

1 Tree

2 Bear

3 Deer

4 Owl

5 Trout

Word Bank: 1^st level, 2^nd level, 3^rd level

1^st level

2^nd/3^rd level

2^nd level

3^rd level

2^nd/3^rd level

Energy Flow

• Food Webs
• Diagrams ALL of the possible feeding relationships in a community.
• More complex than a food chain.