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I. Energy Flow A. Producers / Make their own food through photosynthesis / Examples: Plants, algae A. Producers / Make their own food through photosynthesis.

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Presentation on theme: "I. Energy Flow A. Producers / Make their own food through photosynthesis / Examples: Plants, algae A. Producers / Make their own food through photosynthesis."— Presentation transcript:

1 I. Energy Flow A. Producers / Make their own food through photosynthesis / Examples: Plants, algae A. Producers / Make their own food through photosynthesis / Examples: Plants, algae

2 B. Consumers / Feed on other organisms, cannot make their own food / Example: humans, bear, insects B. Consumers / Feed on other organisms, cannot make their own food / Example: humans, bear, insects

3 C. Decomposers / Break down dead organisms, recycle chemicals to soil, water, & air / Example: fungi & bacteria C. Decomposers / Break down dead organisms, recycle chemicals to soil, water, & air / Example: fungi & bacteria

4 D. Energy enters ecosystems as LIGHT is converted to CHEMICAL ENERGY by producers and exits the ecosystem as HEAT.

5 II. Food Chain A. Trophic levels Feeding level Feeding level Represents position in food Represents position in food chain/food web chain/food web A. Trophic levels Feeding level Feeding level Represents position in food Represents position in food chain/food web chain/food web

6 B. Food Chain pathway of food transfer from one trophic level to another You always start with PRODUCERS on the left/bottom of a food chain. B. Food Chain pathway of food transfer from one trophic level to another You always start with PRODUCERS on the left/bottom of a food chain.

7 C. Producer --> Primary Consumer--> Secondary Consumer--> Tertiary Consumer D. Decomposers are found at EACH trophic level. C. Producer --> Primary Consumer--> Secondary Consumer--> Tertiary Consumer D. Decomposers are found at EACH trophic level.

8 III. Food Web A. Definition: interconnected branching food chains- more realistic representation of feeding relationships A. Definition: interconnected branching food chains- more realistic representation of feeding relationships

9 IV. Three Kinds of Ecological Pyramids A. Energy pyramid / Description: diagram representing energy loss from one trophic level to the next A. Energy pyramid / Description: diagram representing energy loss from one trophic level to the next

10 10% Rule 10% Rule An average of 10% of the available energy at a trophic level is converted to biomass in the next higher trophic level. An average of 10% of the available energy at a trophic level is converted to biomass in the next higher trophic level.

11 B. Biomass Pyramid / Description: represents the dry mass of organisms at each trophic level B. Biomass Pyramid / Description: represents the dry mass of organisms at each trophic level

12 C. Pyramid of Numbers / Description: the number of individual organisms in each trophic level of an ecosystem C. Pyramid of Numbers / Description: the number of individual organisms in each trophic level of an ecosystem

13 Why do you think all 3 pyramids look similar?


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