1. Chapters 19 & 20
Ecologies

2. The study of the interactions between organisms & their environments is . . .
ecology!

3. Remember!
Hierarchy of biological organization

4. A population is . . .what?

5. Variables to population structure
Population density
Dispersion patterns

6. What can happen to a population size?
Dynamics due to

7. Populations can grow quickly
Exponential growth
Exponential growth of rabbits

8. Limitations to population growth
Density dependent factors
carrying capacity

9. Logistic growth

10. Limitations to population growth
Density independent factors

11. Levels of ecological study
Organismal
Population
Community
Ecosystem

12. Community ecology
Interspecific interactions

13. Each organism has a niche
Ecological niche:
The more similar 2 niches are,

15. Keystone species impact diversity
A keystone species

16. Trophic structures show interactions
The pattern of feeding relationships consisting of several levels
food chain:
food web:

18. Food webs

19. Missing from most food chain & food web diagrams. . . !
Detritivores:
Decomposers:

20. Community response to disturbance
A disturbance can result from

21. Response to disturbance
ecological succession
Two kinds of succession

22. Primary succession
Starts in lifeless area without even soil

23. Primary succession

24. Secondary succession
Occurs when disturbance destroyed existing community but left soil intact

25. Secondary succession

26. Levels of ecological study
Organismal
Population
Community
Ecosystem

27. An ecosystem has two parts
Ecosystem biologists study
biotic
abiotic

28. Biomes
Terrestrial biomes’
Aquatic biomes’

29. In an ecosystem,
Energy flows

30. In an ecosystem,
Chemicals cycle

31. Cycling chemicals
Carbon:
Nitrogen:
Phosphorus: