ecology lab 2
Question 1.
A. A species of vole was found to have a type II functional response. At very low food densities what do you expect to limit feeding rate the most? (3pts)
a. Time it takes to find a new prey item
b. Time it takes to handle a prey item
c. They equally contribute to feeding rate
B. At very high food densities what do you expect to limit feeding rate? (3pts)
a. Time it takes to find a new prey item
b. Time it takes to handle a prey item
c. They equally contribute to feeding rate
C. The mortality risk from predation of the vole’s prey _______________ with increasing prey density. (3pts) a. increases b. decreases c. stays the same
D. Type II functional responses have a destabilizing effect on predator prey interactions because: (3pts)
a. the feeding pressure on prey is reduced when the prey are at low densities
b. the feeding pressure on prey is reduced when the prey are at low densities
c. the per capita feeding rate of predators is reduced when their density is high
d. the per capita feeding rate of predators is reduced when their density is low
e. none of the above
Question 2.
A copepod species (the predator, measured in copepods/m3 of water) feeds on algae (measured in cells/m3 of water) in freshwater lakes. Assume that the interaction is well-represented by the Lotka-Volterra predator prey model:
where r = 1/week a= 0.01/copepods/week f= 0.01 copepods/prey q= 0.1/ week
An experimental lake was initiated with 1000 algae cell/m3 and 10 Daphnia/m3.
A. The model predicts that at these densities, the algae density will initially _________ (3pts)
a. increase
b. decrease
c. not change
B. The model predicts that at these densities the Daphnia density will initially _______ (3pts)
a. increase
b. decrease
c. not change
C. Based on this model the per-capita death rate of copepods _________ with increasing prey density. (3pts)
a. increase
b. decrease
c. does not vary
D. What is the
A. A species of vole was found to have a type II functional response. At very low food densities what do you expect to limit feeding rate the most? (3pts)
a. Time it takes to find a new prey item
b. Time it takes to handle a prey item
c. They equally contribute to feeding rate
B. At very high food densities what do you expect to limit feeding rate? (3pts)
a. Time it takes to find a new prey item
b. Time it takes to handle a prey item
c. They equally contribute to feeding rate
C. The mortality risk from predation of the vole’s prey _______________ with increasing prey density. (3pts) a. increases b. decreases c. stays the same
D. Type II functional responses have a destabilizing effect on predator prey interactions because: (3pts)
a. the feeding pressure on prey is reduced when the prey are at low densities
b. the feeding pressure on prey is reduced when the prey are at low densities
c. the per capita feeding rate of predators is reduced when their density is high
d. the per capita feeding rate of predators is reduced when their density is low
e. none of the above
Question 2.
A copepod species (the predator, measured in copepods/m3 of water) feeds on algae (measured in cells/m3 of water) in freshwater lakes. Assume that the interaction is well-represented by the Lotka-Volterra predator prey model:
where r = 1/week a= 0.01/copepods/week f= 0.01 copepods/prey q= 0.1/ week
An experimental lake was initiated with 1000 algae cell/m3 and 10 Daphnia/m3.
A. The model predicts that at these densities, the algae density will initially _________ (3pts)
a. increase
b. decrease
c. not change
B. The model predicts that at these densities the Daphnia density will initially _______ (3pts)
a. increase
b. decrease
c. not change
C. Based on this model the per-capita death rate of copepods _________ with increasing prey density. (3pts)
a. increase
b. decrease
c. does not vary
D. What is the