1. Warm Up:
Image Explain: In the , find 3-4 errors with this food web, and describe how to fix them.

2. During which years is the population of willow trees growing exponentially?
2. What is the carrying capacity of this population?
3. What kind of graph is shown when a population reaches its carrying capacity?
Warm Up – TUESDAY SPOT
4. Explain why a population cannot grow exponentially forever.

3. Predator-Prey Interactions

4. Predation (pg 778)
Definition: An interaction in which one organism hunts then eats another
PREDATOR – the organism doing the eating
PREY – the organism getting eaten

5. Predation:
Not Predation:

6. “Boom – Bust” Population Cycle
Some populations increase rapidly
and then decrease rapidly
THINK ABOUT IT….
Describe why a predator – prey interaction usually results in a boom-bust cycle
(BOOM)
(BUST)

7. Predator ADAPTATIONS:
Things that help them find and capture prey easier
Speed / Agility
Coloring
Team up in packs
Acute senses
Claws, teeth, fangs, stingers

8. Things that help them avoid getting eaten
Prey ADAPTATIONS
Things that help them avoid getting eaten
Retreat to safety
Flee quickly
Camouflage
Warning coloration
Mimicry

9. Symbiotic Relationships (pg 780)
Definition: A close interaction between two species in which one of the species lives in, on or near the other.

10. One organism benefits, the other is harmed
Parasitism
One organism benefits, the other is harmed
Examples:
Tapeworm
Mosquito
Fleas/ticks
Sea Lamprey
Bacteria

11. Both organisms benefit from the interaction
Mutualism
Both organisms benefit from the interaction
Examples:
Bee and flower
Crocodile and Plover
Oxpecker and Zebra

12. One organism benefits, the other is neither helped nor harmed
Commensalism
One organism benefits, the other is neither helped nor harmed
Examples:
Fringed toed lizard and rat
Moss and tree
Barnacle and whale

13. Symbiosis Image Explain
What kind of relationship is this?
(MUTUALISM, COMMENSALISM OR
PARASITISM?)
Who benefits?
How can you tell?

14. Symbiotic – Crab Example
Read the article and determine what type of relationship is shown.
How can you tell?
BRAIN POP!!!