KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem. - PowerPoint PPT Presentation

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KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem.

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KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem. A food chain is a model that shows a sequence of feeding relationships. – PowerPoint PPT presentation

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Title: KEY CONCEPT Food chains and food webs model the flow of energy in an ecosystem.


1
KEY CONCEPT Food chains and food webs model the
flow of energy in an ecosystem.
2
A food chain is a model that shows a sequence of
feeding relationships.
  • A food chain links species by their feeding
    relationships.
  • A food chain follows the connection between one
    producer and a single chain of consumers within
    an ecosystem.

3
  • Consumers are not all alike.


4
Herbivore
  • Eat only plants

5
Carnivores
  • Eat only animals

6
Omnivores
  • Eat both plants and animals.

7
Detritivores
  • Eat dead organic matter.

8
Decomposers
  • are detritivores that break
  • down organic matter
  • into simpler compounds

9
Scavengers
  • Eat dead stuff
  • Natures Clean up Crew

10
  • Specialists are consumers that primarily eat one
    specific organism or a very small number of
    organisms.
  • Generalists are consumers that have a varying
    diet.

11
Trophic Levels
  • Trophic levels are the
  • nourishment levels
  • in a food chain.

12
Trophic Levels
  • Omnivores, such as humans that eat both plants
    and animals, may be listed at different trophic
    levels in different food chains.

13
Trophic Levels
  • Primary consumers are herbivores that eat
    producers.

14
Trophic Levels
  • Secondary consumers are carnivores that eat
    herbivores.

15
Trophic Levels
  • Tertiary consumers are carnivores that eat
    secondary consumers.

16
Trophic Levels
  • Omnivores, such as humans that eat both plants
    and animals, may be listed at different trophic
    levels in different food chains.

17
A food web shows a complex network of feeding
relationships.
  • An organism may have multiple feeding
    relationships in an ecosystem.
  • A food web emphasizes complicated feeding
    relationships and energy flow in an ecosystem.

18
Food Web
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