Warm-up

1
Warm-up

• Draw a food chain using these organisms

Millipede
Big Leaf Maple
Salamander
Sharp Shinned Hawk
Garter Snake
2
Food Chain
Sharp Shinned Hawk
Millipede
Salamander
Garter Snake
Big Leaf Maple
Todays objective Using a food web to illustrate
and analyze how energy flows through an ecosystem.
3
Its all about ENERGY!

• Arrows show direction of ENERGY flow
• NOT direction of eating

Grass
Cow
Grass
Cow
4
Food Web

• Insert the following organisms into your diagram
  to convert your food chain into a food web

Shrew
Club Moss
Banana Slug
Bullfrog
5
Food Web
Shrew
Food WEB
Sharp Shinned Hawk
Garter Snake
Big Leaf Maple
Millipede
Salamander
Food CHAIN
Banana Slug
Club Moss
Bullfrog
6
Check in

• How does a food web differ from a food chain?
• Is a food web a network? Explain your answer.

7
Producers

• Place a star next to all the organisms that are
  producers in your food web.

8
Classifying organisms by energy intake

• Producer- Gets energy from the sun.
• Consumer- Gets energy from eating other
  organisms.
• Herbivore- eats plants
• Carnivore- eats animals
• Omnivore- eats plants and animals

9
Primary, Secondary, Tertiary Quaternary
Consumers

• Place a 1 next to any consumer that can act as
  a primary consumer
• A 2 next to any consumer that can act as a
  secondary consumer
• A 3 for tertiary consumers
• And a 4 for quaternary consumers.

10
Trophic levels

• Trophic level- An organisms position in food
  chain. All organisms in the same position in a
  food chain are in the same trophic level.

Millipede
Salamander
Snake
Hawk
Maple
(1) Primary Consumer
(2) Secondary Consumer
(3) Tertiary Consumer
(4) Quaternary Consumer
Producer
11
Check-in

• In a food web, what is the difference between a
  consumer and a producer?
• If all the shrews in our food web died, could
  this cause a change in the hawk population?
  Explain.

12
Abiotic Factor

• Add the following abiotic node to your network
• Sunlight
• NOTE Use a different shape to show that this
  node is different from the previous biotic nodes.
• Draw a key for your network to identify both
  types of nodes and your edges.

13
Biotic Abiotic Factors

• Biotic Factors The living components of an
  ecosystem.
• Plants, animals, bacteria, etc.
• Abiotic factors the non-living components of an
  ecosystem
• Sunlight, Water, Temperature, Minerals, Salinity
  (salt content), Space, Rocks/soil

14
ECOSYSTEMS

• Ecosystems include both living (biotic) and
  non-living (abiotic) components