Warm Up:

SunlightPrimary Producer

GrassCarnivoreProducer

Autotroph

TreesHeterotrophConsumerOmnivore

insectsAutotrophHerbivorePrimary

Consumer

Small mammalsProducer

HeterotrophCarnivore

OwlHerbivorePrimary

ConsumerAutotroph

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

1. 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?

1 2 3 4 5 6 7 8 9 101112131415161718190

50

100

150

200

250Number of willow trees

Number of willow trees

Time (years)

Num

ber o

f Tre

es

4. Explain why a population cannot grow exponentially forever.

Warm Up – TUESDAY SPOT

Predator-Prey Interactions

Predation (pg 778)Definition: An interaction in which one

organism hunts then eats another

PREY – the organism getting eaten

PREDATOR – the organism doing the eating

Predation: Not Predation:

“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)

Predator ADAPTATIONS:

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

Prey ADAPTATIONS

Things that help them avoid getting eaten• Retreat to safety• Flee quickly• Camouflage• Warning coloration• Mimicry

Symbiotic Relationships (pg 780)

• Definition: A close interaction between two species in which one of the species lives in, on or near the other.

ParasitismOne organism benefits, the other is harmed

Examples:•Tapeworm•Mosquito•Fleas/ticks•Sea Lamprey•Bacteria

MutualismBoth organisms benefit from the interaction

Examples:•Bee and flower•Crocodile and Plover•Oxpecker and Zebra

CommensalismOne organism benefits, the other is neither

helped nor harmed

Examples:•Fringed toed lizard and rat•Moss and tree•Barnacle and whale

Symbiosis Image Explain

• What kind of relationship is this?

(MUTUALISM, COMMENSALISM OR

PARASITISM?)• Who benefits?

• How can you tell?

Symbiotic – Crab Example

• Read the article and determine what type of relationship is shown.

• How can you tell?

BRAIN POP!!!