Food Web

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Food Webs : 

Food Webs

Autotrophs : 

Autotrophs A groups of organisms that can use the energy in sunlight to convert water and carbon dioxide into Glucose (food) Autotrophs are also called Producers because they produce all of the food that heterotrophs use Without autotrophs, there would be no life on this planet Ex. Plants and Algae

Autotrophs : 

Autotrophs

Heterotrophs : 

Heterotrophs Organisms that do not make their own food Another term for Heterotroph is consumer because they consume other organisms in order to live Ex. Rabbits, Deer, Mushrooms

Heterotrophs : 

Heterotrophs

Heterotrophs : 

Heterotrophs Consumers 1. Scavengers/Detritivores – feed on the tissue of dead organisms (both plans and animals) Ex. – Vultures, Crows, and Shrimp

Heterotrophs : 

Heterotrophs Consumers 2. Herbivores – eat ONLY plants Ex. – Cows, Elephants, Giraffes

Heterotrophs : 

Heterotrophs Consumers 3. Carnivores – eat ONLY meat Ex. – Lions, Tigers, Sharks

Heterotrophs : 

Heterotrophs Consumers 4. Omnivores – eat BOTH plants and animals Ex. – Bears and Humans

Heterotrophs : 

Heterotrophs Consumers 5. Decomposers – absorb any dead material and break it down into simple nutrients or fertilizers Ex. – Bacteria and Mushrooms

Transfer of Energy : 

Transfer of Energy When a zebra eats the grass, it does not obtain all of the energy the grass has (much of it is not eaten) When a lion eats a zebra, it does not get all of the energy from the zebra (much of it is lost as heat)

Transfer of Energy : 

Transfer of Energy The two (2) previous examples of energy transfer show that no organism EVER receives all of the energy from the organism they just ate Only 10% of the energy from one organism is transferred to the next – this is called the 10% law

Food Chains : 

Food Chains The energy flow from one organism to the other is know as a food chain A food chain is simple and direct It involves one organism at each trophic level Primary Consumers – eat autotrophs (producers) Secondary Consumers – eat the primary consumers Tertiary Consumers – eat the secondary consumers Decomposers – bacteria and fungi that break down dead organisms and recycle the material back into the environment

Food Chain : 

Food Chain

Food Web : 

Food Web Most organisms eat more the JUST one organism When more organism are involved it is know as a FOOD WEB Food webs are more complex and involve lots of organisms

Food Web : 

Food Web

Food Web : 

Food Web Notice that the direction the arrow points  the arrow points in the direction of the energy transfer, NOT “what ate what”

Food Web : 

Food Web

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