1. Suppose that rabbits are the only prey and food supply of foxes, and that the predator-prey interaction follows Lotka-Volterra dynamics. The mortality rate of foxes in the absence of rabbits is 0.1 per week, and the intrinsic growth rate of rabbits in the absence of predation is 0.2 per week. The capture efficiency is 0.002, and the efficiency at which rabbit biomass is converted into fox biomass is 0.2. a. If there are 30 foxes in a population and 400 rabbits are present, the rate at which prey will be killed (consumption rate) is per week. b. If there are initially 30 foxes and 400 rabbits, the overall rate of change in the rabbit population will be: c. If there are initially 30 foxes and 400 rabbits, the net growth rate in the fox population will be: d. If the number of rabbits and foxes double, but the search efficiency stays the same, what will happen to the number of rabbits killed? Does it double, too?

1. Suppose that rabbits are the only prey and food supply of foxes, and that the predator-prey interaction follows Lotka-Volterra dynamics. The mortality rate of foxes in the absence of rabbits is 0.1 per week, and the intrinsic growth rate of rabbits in the absence of predation is 0.2 per week. The capture efficiency is 0.002, and the efficiency at which rabbit biomass is converted into fox biomass is 0.2. a. If there are 30 foxes in a population and 400 rabbits are present, the rate at which prey will be killed (consumption rate) is per week. b. If there are initially 30 foxes and 400 rabbits, the overall rate of change in the rabbit population will be: c. If there are initially 30 foxes and 400 rabbits, the net growth rate in the fox population will be: d. If the number of rabbits and foxes double, but the search efficiency stays the same, what will happen to the number of rabbits killed? Does it double, too?

Biology 2e

2nd Edition

ISBN:9781947172517

Author:Matthew Douglas, Jung Choi, Mary Ann Clark

Publisher:Matthew Douglas, Jung Choi, Mary Ann Clark

Chapter45: Population And Community Ecology

Section: Chapter Questions

Problem 2VCQ: Figure 45.10b If the major food source of the seals declines due to pollution or overfishing, which...

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For the cricket, the intrinsic growth rate is 100 and the carrying capacity of the environment is 200,000 individuals. For the frog, the capture efficiency is 0.0002, the conversion efficiency is 0.1, the handling time per cricket is 0.2 hours, and the density-independent per capita death rate of the predator is 0.4. 18. At what value of the number of crickets is the predator population of frogs at equilibrium? 19. What is the dN/dt of the prey population when the number of frogs is 60 and the number of crickets is 11,000? Round to the nearest hundredth. 20. What is the dP/dt of the predator population when the number of frogs is 60 and the number of crickets is 11,000? Round to the nearest hundredth.
7.Optimal foraging theory suggests that ____________. A) when handling time is long relative to search time, predators should be generalists. B) specialized diets are rare in nature. C) new items are added to the diet only if their handling time is larger than average. D) when search time is long relative to handling time, predators should be generalists.
12. Which of the following dynamics are not predicted by the Lotka-Volterra predator-prey model using an exponential growth function (the simplest form)? a. exponential decline of the predator population in the absence of prey b. coexistence of predator and prey c. exponential growth of the prey population in the absence of predators d. none, all of these are predicted by the predator-prey model e. unstable oscillations in predator and prey density
Suppose that hares are the only prey and food supply of bobcats, and that the predator‒prey interaction follows Lotka‒Volterra dynamics. The mortality rate of bobcats in the absence of rabbits is 0.1 per month. The intrinsic growth rate of rabbits in the absence of predators is 0.2 per month. The attack efficiency of bobcats is 0.004. The efficiency at which hare biomass is converted into bobcat biomass is 0.25. If there are 60 bobcats and 400 hares, the instantaneous rate of change in the hare population will be a ____________ per month, and the instantaneous rate of change in the bobcat population will be a ____________ per month. A. loss of 16 hares; loss of 6 bobcats B. loss of 16 hares; gain of 18 bobcats C. gain of 16 hares; gain of 6 bobcats D. gain of 80 hares; gain of 24 bobcats E. loss of 96 hares; gain of 6 bobcats
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1.In wildlife management, population numbers must be sustainable in that populations cannot exceed the environment’s ability to support them. Using the ∆N formula, consider the following: Coyotes are members of the Canis family, or dog family, that wanders natural or agricultural grasslands and temperate forest in search of rodents and small prey. Occasionally they will form packs to bring down a larger animal – perhaps a young, sick, or old deer. In this scenario, assume population numbers of coyotes have increased dramatically. a.Using your knowledge of the ∆N formula, provide four possible causes for this dramatic increase in population. b.Assume you are a wildlife manager and that the high coyote population is resulting in more human/coyote interactions. Steps need to be taken to correct the imbalance in coyotes. Provide two ecologically sound solutions to the problem.
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9) If the population of hawks in this area increases, their prey populations might decrease. Later, with fewer prey, the hawk population might decrease. The prey populations might then increase. This is an example of
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