Energy flows through ecosystem in one direction from sun or organic compounds to producers (autotrophs) then to consumers (heterotrophs)

Producers? Consumers?

What do arrows show?

Food Chains: series of steps in which organisms transfer energy by eating and being eaten

ProducerConsumer1Consumer2Consumer3

Producer? Consumer1,2,3?

Food Webs: Various feeding relationships in an ecosystems (multiple food chains)

Producers, consumer1’s, consumer2’s,etc.?

Trophic Level: Each step in a food chain or food web

“trophe” greek- food or nourishment

Laws of Thermodynamics:1st Law of energy: energy cannot be created or

destroyed2nd Law of energy: no energy transfer is 100%

Ecological Pyramid- diagram shows relative amounts of energy or matter contained within each trophic level in a food chain or food web

Don’t copy: reminder

Trophic Level: Each step in a

food chain or food web“trophe” greek- food or nourishment

Which trophic level shows the

Most amount of food?

3 types of pyramids:1. Energy Pyramid- shows

relative amount of energy available at each trophic level

Don’t copy

*only 10% of energy available within one trophic level is transferred to organisms at next trophic level

*the more levels that exist between a producer and a top-level consumer, the less energy that remains from original amount

If 1st trophic level has 500% energy, 2nd has?

2. Biomass Pyramid: represents the amount of potential food available for each trophic level in an ecosystem

*Expressed in grams or organic matter per unit area

Biomass- amount of living tissue within trophic level

3. Pyramid of Numbers: Shows the relative number of individual organisms at each trophic level

How many rabbits on 2nd trophic level?