Prelecture Chapter 53 Community Ecology
Name: _______________________
1. Fill in the table. Use a “+” to indicate a benefit, a “-“ to indicate a negative affect and a 0 to indicate no effect
Interaction
Competition
predation
Herbivory
parasitism
disease
commensalism
mutualism
Species A
Species B
2. According to the principle of competitive exclusion, two species cannot continue to occupy the same _____.
a. environmental habitat
b. ecological niche
c. territory
d. range
e. biome
3. Compare and contrast Batesian mimicry and Müllerian mimicry
4.What are the two components of species diversity? How can two communities with the same numbers of
species differ in terms of species diversity?
5. Draw a food web for any ecosystem you can think of (use something different than the textbook but you can
use the internet). You could draw one for you yard, the Puget sound etc…
6. Keystone predators maintain species diversity in a community by
a. competitively excluding other predators.
b. preying on the community's dominant species.
c. allowing immigration of other predators.
d. reducing the number of disruptions in the community.
e. coevolving with their prey.
7. Food chains are usually short mainly because
a. only a single species of herbivore feeds on each plant species.
b. local extinction of a species causes extinction of the other species in its food chain.
c. most of the energy in a trophic level is lost as it passes to the next higher level.
d. predator species tend to be less diverse and less abundant than prey species.
e. most producers are inedible.
8. How does a dominant species’ effect on a community structure differ from a keystone species’ effect?
9. What are the two types of succession and how do they differ?
10. Which theory below suggests that reducing or increasing the abundance of one species in a community
affects many other species?
a. integrated hypothesis
b. individualistic hypothesis
c. rivet model
d. redundancy model
e. none of the above