1. Week 1
Ecology Chapters 52-54

2. Dispatch—Make 3 observations on the distribution of biomes

3. Goal and Name same side
Line up for pic

4. Descending air absorbs moisture Ascending air releases moisture
Air Cells
Descending air absorbs moisture
Ascending air releases moisture

5. Group whiteboard Draw a mountain
Predict what happens to air as it rises over a mountain

6. How mountains affect rainfall. RAINSHADOW

7. Show the O2 and CO2 cycle Be as detailed as possible
One person will be picked to present

8. Nitrogen cycle

9. Dispatch
If your group needs to presentfind a group to listen and approve you
If your group is approved listen to group’s nitrogen presentation if they have all components, tell me

10. Nitrogen Cycle Animation

11. Population vs. Community

12. Population Ecology QUESTIONS: What is a population?
What affects the size a population can get?

13. Population
A population is a group of individuals of a single species that simultaneously occupy the same general area.
Two characteristics that affect populations are ________ and _______

14. Population characteristics
Density~ # of individuals per unit of area
•counts •sample size estimate
•indirect indicators
•mark-recapture
Dispersion~ pattern of spacing
•random~ unpredictable, patternless spacing (a)
•clumped~ patchy aggregation (b)
•uniform~ even spacing (c)

15. Density is the result of a dynamic interplay
Between processes that add individuals to a population and those that remove individuals from it

16. Births and immigration add individuals to a population.
PopuIation size
Emigration
Deaths
Deaths and emigration remove individuals from a population.

17. Activity:
Make a graph for a bacterial population and an elephant population

20. Dispatch—Get a textbook
Draw an exponential growth curve? What species exhibit this growth?
What about the environment would make an r species exhibit exponential growth?
Describe what a population’s carry capacity is and what it means to the population?
Compare and contrast density- dependent to density-independent factors?
Take our calendar and tell your tablemates 3 upcoming deadlines
Pick up a growth half sheet and a paper that says class set
Wilderness Park 9:30 TOMORROW

21. Population Growth Models
Exponential model (blue) • idealized population in an unlimited environment (J-curve); r-selected species (r=per capita growth rate)
Logistic model (red) •carrying capacity (K): maximum population size that a particular environment can support (S-curve); K-selected species

22. Demography: factors that affect growth & decline of populations
Birthrate (natality, fecundity)~ # of offspring produced
Death rate (mortality)
Age structure~ relative number of individuals of each age
Survivorship curve~ plot of numbers still alive at each age

23. R vs. K survivorship curves

24. Population life history “strategies”
r-selected (opportunistic)
Short maturation & lifespan
Many (small) offspring; usually 1 (early) reproduction; no parental care
High death rate
Ex:________
K-selected (equilibrial)
Long maturation & lifespan
Few (large) offspring; usually several (late) reproductions; extensive parental care
Low death rate
Ex:____________

25. Population limiting factors
Density-dependent factors
•competition
•predation
•stress/crowding
•waste accumulation
Density-independent factors •weather/climate
periodic disturbances

26. Community Ecology QUESTIONS: 1) What is a community?
2) Who are the members of this community?
3) What is a food chain?

27. Differences in Community structure
Community~ an assemblage of populations living close enough together for potential interaction. Many different ______.
Communities differ dramatically in their species richness (number of species) & relative abundance of different species

28. How can we account for the species found together as members of a community?
2 Hypotheses:
•Individualistic~ all the species just happened to live in the same area b/c they all had similar abiotic requirements. Example they all needed same temperature, rainfall, soil type which is why they live in the same habitat.
•Interactive~ all the species are locked into association by mandatory biotic interactions. Species are found together b/c they have formed relationships +, - and o.

29. Between Species
TASK: Add a column to the right and give an example of each type of interaction

30. Activity: Interaction Charades
I will give your group an interaction and you act it out