Post on 24-Dec-2015
transcript
ENERGY TRANSFER
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
TROPHIC LEVEL REVIEW…
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
1st Level Consumers
2nd Level
___% of Energy
___% of Energy
___% of Energy
___% of Energy3rd Level Consumers
Let’s look at the biomass and energy pyramid.
Biomass and Energy Pyramid
Producers produce 100% of an ecosystem’s energy.
PRODUCERS
1st Level Consumers
2nd Level
100% of Energy
___% of Energy
___% of Energy
___% of Energy3rd 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
1st Level Consumers
2nd Level
100% of Energy
10% of Energy
___% of Energy
___% of Energy3rd 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
1st Level Consumers
2nd Level
100% of Energy
10% of Energy
1% of Energy
___% of Energy3rd 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
1st Level Consumers
2nd Level
100% of Energy
10% of Energy
1% of Energy
.1% of Energy3rd Level Consumers
Biomass and Energy Pyramid
Are there more trophic levels?
Typically, where are they located?
PRODUCERS
1st Level Consumers
2nd Level
100% of Energy
10% of Energy
1% of Energy
.1% of Energy3rd Level Consumers
10%
Energy Movement
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
1ST LEVEL
2ND LEVEL
3RD LEVEL
*Move decimal 1 space to left for every trophic level above producers!*
.1%
3rd Level:3 spaces to left
1%
2nd Level:2 spaces to left
10%
1st 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 2nd level consumer, a fox. What about a 1st 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?