Energy Transfer Energy transfers from one organism to another when they are consumed and metabolized Energy can be followed based on how organism obtain energy Trophic levels the position of an organism in a sequence of energy transfer ID: 530743
Download Presentation The PPT/PDF document "Energy Flow: Food Chains and Webs" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
Energy Flow: Food Chains and WebsSlide2
Energy Transfer
Energy transfers from one organism to another when they are consumed and metabolized.
Energy can be followed based on how organism obtain energy.
Trophic levels – the position of an organism in a sequence of energy transferTrophic levels are depicted in food chains.Slide3
Food Chains and Food Webs
A food chain is a single pathway of feeding relationships in an ecosystem
Draw the following food chain!
Feeding relationships are much more complex than a simple food chain. This complexity is shown through a food web. Add on to the chain in a food web!Slide4
10% rule
Every time energy is transferred from one organism to another, not all of the energy is passed on. In fact, more often than only a very low portion of the energy is transferred.
On average, only 10% of the total energy consumed in one trophic level is passed on to the next level.
Why?Slide5
Biomass
Because so little of the energy is transferred from trophic level to trophic level, the higher trophic levels can only support a limited number of organisms.
This is because they must consumer a greater number of organisms to reach the amount of energy they need to survive.
This is why an ecosystem will have less carnivores than herbivores. For example in Africa there about 1000 herbivores for every lion. Slide6
Biological Magnification
The low energy transfer in each trophic level can lead to some serious consequences in the higher trophic levels.
Biological magnification is the increase of a substance in food chains or webs due to the low transfer of energy which leads to the need for consumption of a greater number of organisms at the high trophic levels.Slide7
Food chains and webs
Create a food chain
Use 4 organisms and the sun
Use arrows in one color to show the flow of energyLabel each organism with its trophic levelShow how much energy is in each level
Label them with what type of producer or consumer they are (herbivore, carnivore,
etc
)
Make it a food web
Add 6 more organisms to your chain to make it a web
Use arrows in a second color to show the flow of energy
Label them with what type of producer or consumer they are (herbivore, carnivore,
etc
)
Explain the 10% rule and biological magnification in your own words on the back