9/18/14 objective: how do living things get their energy? do now: recall the levels of organization,...
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9/18/14
Objective: How do living things get their energy?
Do Now:
Recall the levels of organization, what is an ecosystem?
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Ecology
• ecology: the interactions between organisms and their environment
• Biotic factors: all of the living things
• Abiotic factors: non-living conditions
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Types of organisms
• Producers (autotrophs): make their own food– Energy from the sun
• Consumers (heterotrophs): eat other organisms for energy– Herbivores: eat plants– Carnivores: eat animals– Omnivores: eats both
plants and animals– Decomposers: break down
remains of plants and animals
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Food Chains• Draw the Arrows:
Grass Insect Bird Fox
Where does the initial energy come from?
How does each organism obtain their energy?
This is a food chain
A food chain is a sequence in which energy is transferred from one organism to the next as each organism eats another organism
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Food Webs
• Food webs are interconnected food chains that show many feeding relationships
hawk
Bird snake
mouse insect
seeds grass
- The arrows show the FLOW OF ENERGY
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Food WebsEnergy flows
in one direction. Which direction?
Energy flows from producers to herbivores to carnivores to decomposers
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Factors that affect stability
- Food webs more stable than food chains
- Removing or adding organisms can be harmful to the stability