1. POGIL GROUPS – 1st BLOCK Group 1 Destinee Angel Jose Group 2 Brooklyn
Tommy
Celeste
Group 3
Princess
Christian
Chayra
Group 4
Damien
Jordan
Group 5
Antoinette
Jackson
Miahra

2. POGIL GROUPS – 3RD BLOCK Group 1 Lucy Luke Jacob Scotlyn Group 2 Aisha
John P.
Heba
Clayton
Group 3
Carl
Ellie G.
Isabella
Hau
Group 4
Sarah
Jake
Matthew
Mena
Group 5
Adam
Lily
Ursula
Chris
Lyric
Group 6
Elle B.
Zoe
Garland
John O
Anthony
Group 7
Justin
Jeremy
Tori
Dani
Group 8
Beau
Samantha
Ryan
Cameron
Emmie C.

3. POGIL GROUPS – 4th BLOCK Group 1 Colin Henry Grace Caroline P. Group 2
Gavin
Miles
Ryan
Tyler
Group 3
Allen
Kenneth
Caroline R.
Emma G.
Group 4
Zae
Peter
Jordan
Emma N.
Group 5
Josh
Evan
Paola
Lily
Emma M.
Group 6
Adam
Alex
Maddie
Haley
Chris

6. Biology Handbook p. 200 Get a chrome book and go to the class website.
Lindsaymathisbiology.weebly.com
Go to Standard Biology
Click on Ecology Tab
Click on 33.Populations and fill in your HB notes starting on p. 200
Answer all box questions and CYQ questions!

7. How do communities change over time?
p. 200
Population Growth
How do communities change over time?

8. How do living things interact in a community?
A. Competition - a struggle for resources among organisms.
Ex. Nesting space for birds

9. Fill It In …
Picture of competition:

10. How do living things interact in a community?
B. Predation
Predators are organisms that consume other organisms
Ex. Zebra eating grass
Prey are organisms that are being consumed.
Ex. Earthworm being eaten by a bird

11. How do living things interact in a community?
C. Symbiosis - two organisms of different species living together in a close, permanent relationship; 3 types

12. 3 types of symbiosis:
Mutualism - two organisms benefit each other (+,+)
Ex. Termite and protozoan
Ex. Lichen - an alga and a fungus

13. 3 types of symbiosis:
2. Parasitism - one organism benefits and the other is harmed (+,-)
Ex. Tapeworm and human
Ex. Mistletoe and tree

14. 3 types of symbiosis:
Commensalism - one organism benefits and the other is unaffected (+,0)
Ex. Clownfish and sea anemone
Ex. Whale and barnacles
Symbiosis Video

15. Fill It In …
Fill in the correct type of symbiosis for the following symbols:
+,+ __________________
+,- ___________________
+, 0 _____________________

16. Check Yourself!
Which biotic relationship is defined as a “struggle for resources”?
In your backyard, you observe a snake entering your birdfeeder. Who is the predator and who is the prey?
What is symbiosis?

17. Also called EXPONENTIAL GROWTH
Population growth
Populations will grow until they reach their biotic potential, unless they are limited by factors in the environment
This type of growth is known as a J-curve
Also called EXPONENTIAL GROWTH

18. Exponential Growth
Occurs when the individuals in a population reproduce at a constant rate
Under ideal conditions with unlimited resources

19. Fill It In …
Define “exponential growth”:

20. Also called LOGISTIC GROWTH
Population growth
2. Limiting factors, such as availability of food, water, and space establish a carrying capacity for populations
This type of growth is known as a S-curve.
Also called LOGISTIC GROWTH

21. Logistic Growth
Occurs when a population’s growth slows or stops following a period of exponential growth
As resources become less available, the growth of a population slows or stops

22. Fill It In …
List limiting factors for a population of dandelions:

23. Population growth
3. Carrying capacity is defined as the number of individuals an environment can support.

24. Population growth
Limiting factors in the environment help to maintain ecosystem stability by allowing populations to fluctuate around the carrying capacity.
This is called dynamic equilibrium.

25. What is the CARRYING CAPACITY of the deer on WallaWalla Island?

26. Population growth
Density dependent factors have a greater effect on a population when there is a higher population density (the number of individuals in a given space). (larger population sizes)
For example, competition, predation, and the spread of infectious diseases are density-dependent factors.

27. Population growth
Density independent factors influence the size of a population regardless of its density.
For example, natural disasters such as forest fires are density independent factors. Others would include human influences like war, urban sprawling, and deforestation.

28. Turn to a partner and discuss…

29. Population growth
Succession is the idea that communities will replace other communities in a predictable, orderly way; this happens because every community alters the physical factors of the environment.
Ex. As trees grow, they produce shade.

30. Check Yourself! What kind of curve illustrates exponential growth?
What determines the carrying capacity of the environment?
List 3 examples of limiting factors.

31. Practice! Complete the practice worksheet (both sides).
We will go over the answers.