Food Chains and Food Webs in an Ecosystem

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Presentation transcript:

Food Chains and Food Webs in an Ecosystem Cornell Notes pg. 153

Shows transfer of energy as organisms feed. What is a Food Chain? Shows transfer of energy as organisms feed. Producer -> Consumer(s) -> Decomposer

What is a Food Web? Shows multiple food chains of what is eating what.

a consumer that kills and eats all or part of another consumer What is a Predator? a consumer that kills and eats all or part of another consumer

What are Prey? consumers that are killed and eaten by another consumer

Food Production and Energy Efficiency At each stage in a food chain, less material and less energy are contained in the biomass of the organisms. Long food chains are therefore inefficient. If a farmer has one hectare of land, he could either use the land to grow food for cows, which would then be fed to humans, or use the land to grow corn to feed humans directly. It would be more efficient to grow corn for humans, because less energy is wasted in the shorter food chain. In fact, ten times as many people could be fed from the same area of land. Shorter food chains are more efficient for food production.