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Classify as Biotic or Abiotic. Classify as Biotic or Abiotic. Food Chains / Webs. Unit 1 Day 2. Food Webs. Trophic Level How directly a consumer interacts with its producers in an ecosystem. (feeding level). Food Webs. Food Webs. 5 th Trophic Level. Quarternary Consumers. - PowerPoint PPT Presentation
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Classify as Biotic or Abiotic
Whale Fish Al Cloud Steak Frog Newt Plastic H2O
Clock Paper Wood Corpse Plant Bread Lead Cat Leaf
Water Glass Parasite Snail pork chop
Turtle Wool Air Algae
Classify as Biotic or Abiotic
WhaleB
FishB
AlA
CloudA
SteakB
FrogB
NewtB
PlasticA
H2O
A
ClockB (wood)
PaperB
WoodB
CorpseB
PlantB
BreadB
LeadA
CatB
LeafB
WaterA
GlassA
ParasiteB
SnailB
pork chopB
TurtleB
WoolB
AirA
AlgaeB
Unit 1Day 2
Food Chains / Webs
Food Webs
Trophic Level
How directly a consumer interacts with its producers in an ecosystem. (feeding level)
Food Webs
Food Webs
5th Trophic Level
4th Trophic Level
3rd Trophic Level
2nd Trophic Level
1st Trophic Level
carnivore
carnivore
carnivore
herbivore
Producer
Quarternary Consumers
Tertiary Consumers
Secondary Consumers
Primary Consumers
Food Webs
Food Chain:
A feeding sequence in which each kind of organism eats the one below it in the chain.
Arrows mean (eaten by), and they also show the movement of food energy in the system.
Food Webs
The organisms in a food chain are dependent on one another.
Any change in a particular trophic level will affect all of the other levels (below and above).
Food Webs
Example:
Grass Grasshopper Frog Snake Owl
Food Webs
Grass Grasshopper Frog Snake Owl
If the frog population is removed then there is a gap in the feeding order...
Without a food source, the snake would die, as would the owls.
The grasshoppers, with no natural predators, would increase in numbers.
Eventually they would eat all the grass and die as well.
This single chain is not realistic
Food Webs
In any area there are many chains which interconnect. Most consumers have many different food sources, so if one is limited they can switch to another.
This is referred to as a food web
Food Web = interconnecting food chains
Food Webs
Example
http:nature.ca
Food Webs
Example
www.champaignschools.org
Food Webs
Example
Food Webs
Example
www.ifaw.org
Food Webs
Example: Copy this into your notes
www.marietta.edu
