Think about how you get energy into your home…

How we get energy?

Is energy lost??? Yes, We lose energy all the time in the form of Heat Examples: Lightbulbs or Powerlines

How is energy Transferred in nature? Autotrophs…. get the energy from the sun and make it into biomass Heterotrophs eat the autotrophs and other heterotrophs, which gives them energy in the form of biomass

How is energy lost in nature? Heat!! in the form of? -Movement -Reproduction/growth -Waste -Maintenance

Biomass  Total living mass of organisms in an ecosystem

Producers Primary Consumers Secondary Consumers Tertiary Consumers

After energy loss, how much energy is transferred to the next trophic level in a food web?

10% Rule  10% of energy in one level is available for the next level to use.

10% Rule  10% of energy in one level is available for the next level to use.  This means that 90% of energy is lost to the environment in the form of heat after an organisms body has used it for their life processes. John Abraham-Atlanta Falcons

So how much energy does each level get from what it eats? PRODUCERS 1 st Level Consumers 2 nd Level ___% of Energy 3 rd Level Consumers Let’s look at the biomass and energy pyramid.

Biomass and Energy Pyramid Producers produce 100% of an ecosystem’s energy. PRODUCERS 1 st Level Consumers 2 nd Level 100% of Energy ___% of Energy 3 rd Level Consumers

Biomass and Energy Pyramid If 10% gets transferred up to the next level…how much do the primary consumers get from the producers? PRODUCERS 1 st Level Consumers 2 nd Level 100% of Energy 10% of Energy ___% of Energy 3 rd Level Consumers

Biomass and Energy Pyramid If 10% gets transferred up to the next level…how much do the secondary consumers get from the producers? PRODUCERS 1 st Level Consumers 2 nd Level 100% of Energy 10% of Energy 1% of Energy ___% of Energy 3 rd Level Consumers

Biomass and Energy Pyramid If 10% gets transferred up to the next level…how much do the tertiary consumers get from the producers? PRODUCERS 1 st Level Consumers 2 nd Level 100% of Energy 10% of Energy 1% of Energy.1% of Energy 3 rd Level Consumers

Biomass and Energy Pyramid Are there more trophic levels? Typically, where are they located? PRODUCERS 1 st Level Consumers 2 nd Level 100% of Energy 10% of Energy 1% of Energy.1% of Energy 3 rd Level Consumers

10%

Energy Movement Frogs 10 Kg of biomass Insects 100 Kg of biomass Grass 1000 Kg of biomass How much Biomass makes it from One level to the next? (Hint Divide the number above by the one below)

How much biomass will transfer to the bunny? (Change 10% into a decimal) Grass 2000 kg Bunny ___kg Hawk?

10% Rule PRODUCERS 1 ST LEVEL 2 ND LEVEL 3 RD LEVEL *Move decimal 1 space to left for every trophic level above producers!*.1% 3 rd Level: 3 spaces to left 1% 2 nd Level: 2 spaces to left 10% 1 st Level: 1 space to left 100% Producers: 0 space to left Available Energy for next Level Total Energy Algae Brines Birds Coyote 125 kg 12.5 kg 1.25 kg.125 kg

How Much Energy is There???  In a prairie, 4000 kg of grass is available to consume. According to the 10% rule, how much energy would be available to a 2 nd level consumer, a fox. What about a 1 st level rabbit? Math: A fox weighs approximately 8 kg. How many foxes can be sustained by this amount of grass?

Time to practice!  Let’s create a pyramid showing the amount of energy that is transferred up through the trophic levels.

Could you have an ecosystem in which there lived 50kg of algae, 50 kg of brine shrimp and 50 kg of Gull?

How many kg of gulls could 50kg of algae support?