1. *then go to page 70 and title your page!*
Today’s Materials
Interactive Notebook
½ Sheet of loose-leaf paper (warm up/exit)
Pen or Pencil
Thinking brain!
Notebook set up is below
Date Topic/Activity Page #
Interactions in an Ecosystem
*then go to page 70 and title your page!*

2. Warm Up
How are changes in populations related to the availability of an ecosystem's resources?
Large populations need the same amount of resources as small populations.
Changes in population are independent of the availability of an ecosystem's resources.
As populations grow, ecosystems produce more resources in order to support the larger population.
Population sizes are limited by the amount of resources that are available.
Many people want to live in urban areas. One of the main factors that limits the number of people that can live in an area is
the amount of space that is available to build shelter.
the amount of public transportation that is available.
the location of schools, churches, and libraries.
the number of people who don't want to live in an area

3. Today’s Investigation
Topics we’ll Cover:
Interactions in an ecosystem
Activities we’ll do:
Guided Notes
Video Case Studies (multiple)
Classification activity

4. Let’s look at the big picture…
Tell me what you remember about matter aka “stuff” and energy?
Hint: It can never be ______ or _____. Only ___________________________________.
Over a long period of time, matter is transferred between organisms as well as between organisms & their environment.

5. Interactions How doORGANISMS in anECOSYSTEM interact?
ORGANISMS in an ecosystem interact with plants, animals and theirENVIRONMENT.
INTERACTIONS can cause populations toINCREASE or DECREASE.
INTERACTIONS can also cause theECOSYSTEM to change.

6. Stability What is a stableECOSYSTEM?
A stableECOSYSTEM is one in which thePOPULATION and resources change in aPREDICTABLE manner.
In a stableECOSYSTEM, there is healthy balance betweenPREDATOR and PREY.

7. Predation What isPREDATION?
AnINTERACTION species in whichPREDATORS eat PREY.
This healthyRELATIONSHIP balances the populations within anECOSYSTEM.
Example:lions eating gazelles in a grassland regulate the number ofgazelles in the
grassland.

8. Impact of Predation
How does thePREDATOR/ prey relationship affect POPULATION ?
If the number of prey in aPOPULATION increases then the number ofPREDATORS will also increase.
If the number ofPREDATORS decreases, then the number of prey willINCREASE.

9. Competition What isCOMPETITION?
When species within anECOSYSTEM compete for the sameRESOURCES.
Organisms in anECOSYSTEM compete for:
FOOD
WATER
SPACE
Example: In the ocean, dolphins, whales and large fish all compete for smaller fish.

10. Symbiotic Relationships
Symbiosis = __________________________
Sym = same time, together
Bio = life
Co-exist: synonym or antonym?
Cooperate means ___________________
_______________________________________
Living together in a close environment
To work together towards
a common end goal or purpose (think group work)

11. Attack of the Killer Fungi!
Cordyceps - Planet Earth
Make note:
Is an organism benefiting?
Is an organism being harmed?
Can you connect this type of relationship to something you have already learned?

12. The 3 symbiotic relationships
A. Mutualism (+/+)
Both organisms benefit
B. Parasitism(+/-)
1 organsism benefits, another is harmed
C. Commensalism(+/o)
1 organism benefits, other is unaffected

13. Let’s recall… Parasitism Mutualism both organisms benefit
Commensalism
Parasitism
both organisms benefit
one organism benefits
one organism benefits
one organism is unaffected
one organism is harmed

14. Mutualism Both organisms benefit from interaction
Organism One Organism Two

15. Anemone & Clown Fish
This fish lives its entire adult life among the tentacles of a bulb- tentacle sea anemone. Clown fish do not get stung by the anemone as would most other fish so they get protection from predators. The fish often drop food scraps which the anemones can eat.

16. Commensalism One organism benefits, the other is not affected.
Organism One Organism Two

17. Shark & Remora
The remora attaches itself to the shark and saves energy since it doesn’t have to swim, and it gets to snack on the sharks kills. The shark doesn’t get anything.

18. Parasitism
One organism benefits and the other organism (host) is harmed
Organism One Organism Two

19. Loa Loa Worm & Human
This worm infects the human blood stream and gets a nice warm safe home there. The human may go blind or have other complications as a result.

20. Cooperation
Working together so all organisms benefit

21. Ants!
Despite having different jobs, all ants work together for the good of their colony.

22. Competition
Fighting for resources- food, water, shelter, mates

23. Red Deer
During mating season, red deer males will get in many fights to be considered the best male for the females to mate.

24. Predation
One animal hunts, the other is the food

25. Predation
The killer whale swims beneath the seals and then goes up towards the surface, scooping part of the seal in its mouth.

26. What kind of interaction?
You will see real life examples of the interactions addressed in the powerpoint.

27. What interaction is this?
Honey bees
cooperation
Honey bees have specific roles to complete for the success of the colony.
What interaction is this?

28. What interaction is this?
Boxer Crab & Anemones
This Boxer Crab carries a pair of stinging anemones in its claws, which it uses to defend itself from predators. The anemones get to move around which increases their food supply.
mutualism
What interaction is this?

29. Emperor Shrimp & Sea Cucumber
This tiny emperor shrimp is riding along on the back of a sea cucumber (a long worm-like starfish relative) while it crawls along a sandy bottom. The shrimp gets to travel around under the protection of its much larger partner, and the sea cucumber doesn't seem to mind.
commensalism
What interaction is this?

30. What interaction is this?
The Purple Sea Star
The purple sea star consistently feeds on the barnacles that are the greatest number. They all feed on the same type of barnacles.
competition
What interaction is this?

31. What interaction is this?
Cattle & Cattle Egrets
As these cattle walk around eating grass they stir up lots of insects. The egrets hang around and get a yummy meal of insects.
What interaction is this?
commensalism

32. What interaction is this?
Antelope & Ox Bird
This ox bird hangs out on the antelope and gets a delicious meal of bugs living on the antelope. The antelope gets rid of parasites.
What interaction is this?
mutualism

33. Dragonflies and mosquitoes
predation
Dragonflies eat mosquito larvae and fully mature mosquitoes.
What interaction is this?

34. Goby and Alpheid Shrimp
This alpheid shrimp (on
the right) uses its strong claws like a bulldozer to create a burrow in the sand. The shrimp is nearly blind. It relies upon its partner, the sharp-eyed goby, to warn of danger. When a potential predator approaches, both animals disappear quickly into the burrow
mutualism
What interaction is this?

35. Exit Ticket
1. A tick has caused a dog to be diagnosed with Lyme disease. What type of relationship would this suggest exists between the tick and the dog?
a. mutualism b. parasitism c. commensalism d. adaptive
Read the following passage to answer the following 2 questions:
The Green Algae grows on a Tree Sloth. The Green Algae protects and camouflages the Tree Sloth like a suit of armor.
2. What is this symbiotic relationship?
a. Mutualism b. Parasitism c. Commensalism d. Symbiosis 
3. What would happen to the population of each species?
a. Green Algae increases; Tree Sloth increases
b. Green Algae increases; Tree Sloth stays the same
c. Green Algae stays the same; Tree Sloth increases
d. Green Algae decreases; Tree Sloth decreases