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```					                                                     Leader:     Jenny
Ecology Review II                                    Course:     Biology 211
Supplemental Instruction                                         Roe
Instructor:
Iowa State University
Date:    Monday, April 27, 2009

1. Matching:
____ Negative intraspecific interactions               A. Random distribution
____ Positive intraspecific interactions               B. Uniform distribution
____ No strong intraspecific interactions              C. Clumped distribution

2. Compare the terms paired together in each row:
Biotic factors                                 Abiotic factors

Anagenesis                                        Cladogenesis

Prezygotic Barriers                               Postzygotic Barriers

Allopatric speciation                             Sympatric speciation

Logistic Growth Model                             Exponential growth model

Small-population approach                         Declining-population approach

Density-dependent factors                         Density-independent factors

Food chain                                        Food web

Intraspecific Interactions                        Interspecific interactions
Ecosystem characteristics with high NPP          Ecosystem characteristics with low NPP

Semelparous                                      Iteroparous

3. Define the following terms: organism, population, community, and ecosystem.
-organism:

-population:

-community:

-ecosystem:

4. Mark and recapture problem: Suppose that you capture 10 individuals of a rare
subspecies of brook trout from an impounded watershed. You place a pit tag (a very
small radio activated tag) in the body cavity of each individual and then release these
fish. You come back a month later and capture 20 fish and find that four of these are
individuals that you had previously captured and released. What is your best estimate of
the population size, N?

5. Density problem: What is the density of a population if there are 100 individuals in an
area that is 100 m2?

6. Rate of increase problem: What would the change in population be given the following
scenario? Is the population growing or declining? .. 600 squirrels are born in a
population and 400 squirrels in the same population die. Additionally, 100 squirrels
immigrate into the area and 150 squirrels emigrate from the population.

7. Survivorship Curves- Describe each type:
I:

II:

II
8. What is the competitive exclusion principle?

9. Logistic growth model math problem: Look on the board.

10. What are the effects of increasing CO2 levels?

11. What is a keystone species?

12. Describe the extinction vortex and how it can lead to the extinction of a small species.

13. Why is there so much plant biomass if there are herbivores?

14. Description of water cycle:

15. Description of carbon cycle:
Quiz questions:
16. Which of the following are important biotic factors that affect the structure and organization
of biotic communities?
A) precipitation, wind
B) Nutrient availablity, soil pH
C) predation, competition
D) temperature, water
E) Light intensity, seasonality

17. The main reason polar regions are cooler than the equator is because
A) There is more ice at the poles
B) Sunlight strikes the poles at a lower angle
C) The poles are farther from the sun
D) The atmosphere is thicker at the poles
E) The poles are permanently tilted away from the sun

18. Uniform spacing patterns observed in plants like the creosote bush are most often associated
with
A) chance
B) Patterns of humidity
C) Random distribution of seeds
D) Competitive interactions among individuals
E) The concentration of nutrients

19. Which of the following describes having more than one reproductive episode during a
lifetime?
A) cohort
B) dispersion
C) iteroparous
D) semelparous
E) competition

20. According to the competitive exclusion principle, two species cannot continue to occupy the
same
A) habitat
B) niche
C) territory
D) range
E) biome

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