21. Predator—Prey Herbivory Interactions

Question 1

Exploitation

Answer 1

Negative for A positive for B

Question 2

Herbivores vs predators

Answer 2

Herbivores usually don’t kill the entire plant

Predators kill and eat the entire organism

Question 3

Grazer

Answer 3

Feed on nutrient rich, low growing, non-woody plants

Question 4

Browser

Answer 4

Feed on nutrient poor, high-growing biomass

Question 5

What are prey populations influenced by

Answer 5

Food availability

Consumptive efforts of predators

Non-consumptive effects of predators

Question 6

Consumptive effects of predation

Answer 6

Direct effects of predators on prey populations through the capture and consumption of living prey

Question 7

Non-consumptive effects of predation

Answer 7

Changes to prey that results as a consequence of predators being present

Question 8

Lotka-Volterra model

Answer 8

Ignores intraspecific competition

dNh/dt = rh × Nh

Nh = prey population size
t= time
rh= prey per capita rate of increase

Question 9

Lotka volterra including predation

Answer 9

dNh / dt = rh Nh – b Nh Np

b= capture efficiency of prey by predator
Np= predator population size

Question 10

Capture efficiency

Answer 10

b

Success rate of the predator

Question 11

Lotka volterra predator growth rate

Answer 11

dNp/dt = c b Nh Np – dp Np

c= conversion factor of prey to predators

dp= per capita death of predators

b= capture efficiency

Question 12

Conversion factor

Answer 12

How many prey are required to sustain one predator

Question 13

Isocline for prey

Answer 13

Np= rh/b

Question 14

Isocline for predators

Answer 14

Nh= dp/cb