Classify as Biotic or Abiotic

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