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Unformatted text preview: Quantitative Changes in Populations 1. Differentiate between linear, unrestricted exponential and logistic growth. Growth rate Description = Growth rate is constant and independent of population size = Growth rate is proportional to population size =  ( 29 Growth rate is influenced by the difference between carrying capacity and population size 2. Compare the birth rate to the death rate during the lag, log and stationary phases of logistic growth. Lag: birth rate > death rate, but since the population is small growth is slow. Log: birth rate > dearth rate, the population is large, so growth is rapid. Stationary: birth rate = death rate; growth is zero. 3. A fish farmer wishes to raise the population level by simply adding more fish to the pond. Will this work in the long term? Why or why not? If the fish population is already at carrying capacity, then this wont work for long. The augmented population will simply decline toward the carrying capacity and become steady at the old level. (Note the results on page 93.) A better strategy would be to increase the carrying capacity and allow the population to expand naturally to this new, higher, level. 4. Note the graphical data below. What seems to be the carrying capacity (K) in this case? How can you tell? P o p u l a t io n S iz e T i m e 1 0 0 2 0 0 3 0 0 Initial size 10 100 350 The carrying capacity should be the population size where the population levels off. Irrespective of initial size, the population seems to level off at 200. So, 200 is the carrying capacity. 5. What is the relationship of initial population size and carrying capacity? As is suggested in the previous question, initial population size does not affect the carrying capacity. 6. Which of the environmental factors below is the limiting factor? Explain your answer. The limiting factor will affect carrying capacity when the factor is changed. Factor B fits that criterion. Factor A Factor B Factor C K 1 1 1 20 2 1 1 20 3 1 1 20 Factor A Factor B Factor C K 1 1 1 20 1 2 1 22 1 3 1 24 Factor Factor B Factor C K A 1 1 1 20 1 1 2 20 1 1 3 20 7. Which graph best represents competition? Which graph best represents predation? How can you tell? P o p u la t i o n S i z e T im e 10 0 20 0 30 0 Species 1 Species 2 Graph A P o p u l a t io n S iz e T im e 10 0 20 0 30 0 Graph B Graph A is most likely to be a competition in which species 2 is the loser. This conforms to the data presented in the lab. The oscillations in graph B looks like the predatorprey situation presented in lab....
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 Spring '10
 FRIEDMAN

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