Energy Flow: Feeding Relationships 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?

Energy Flow: Food Chains Food Chains: series of steps in which organisms transfer energy by eating and being eaten ProducerConsumer1Consumer2Consumer3 Producer? Consumer1,2,3?

Energy Flow: Food Chains

Energy Flow: Food Chains

Energy Flow: Food webs Food Webs: Various feeding relationships in an ecosystems (multiple food chains) Producers, consumer1’s, consumer2’s,etc.?

Energy Flow: Food webs

Energy Flow: Food webs 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 destroyed 2nd Law of energy: no energy transfer is 100%

Ecological Pyramids 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?

Ecological Pyramids: Energy 3 types of pyramids: 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?

Ecological Pyramids: Biomass 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

Ecological Pyramids: Pyramid of Numbers 3. Pyramid of Numbers: Shows the relative number of individual organisms at each trophic level How many rabbits on 2nd trophic level?