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Related Flashcards
Cards In This Set
| Front | Back |
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What is the description of
Linear growth?
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Growth rate is constant and independent of population
size
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What is the description of
Unrestricted exponential growth?
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Growth rate is proportional to population size
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What is the description of
Logistic growth?
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Growth rate is influenced by the difference between
carrying capacity and population siz
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What type of growth is this?
growth rate(slope)= dN/dT=c 
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Linear growth rate
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What type of growth is this?
growth rate= dN/dT=rN |
Unrestricted exponential growth rate
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What type of growth is this?
growth rate= dN/dT=rN(K-N)/K |
Logistic Growth Rate
Note that the rate of increase is influenced by how large N is compared to K. |
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Compare the birth rate to the death rate
during the lag, log and stationary phases of logistic growth.
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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.A population may level off in a stationary phase near the carrying capacity of its environment |
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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?
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If the fish population is already at
carrying capacity, then this won’t 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.
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What
is the relationship of initial population size and carrying capacity?
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As is suggested in the previous
question, initial population size does not affect the carrying capacity.
The carrying capacity should be the population size
where the population levels off.
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What is evolution?
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changes in the allele frequencies or genotype
frequencies of a population over time.
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What is population?
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A group of interbreeding species members.
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How do you determine which environmental factor is the limiting factor?
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The limiting factor will affect carrying capacity when
the factor is changed.
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Which graph best represents competition?
Which graph best represents predation?
How can you tell?
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When population vs time is graphed:
Graphs that show competition are ones thatone species increases in population as another decreases Graphs that show a predation are ones that oscilate with the prey increasing a little before the predators increase. |
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What is an example of Linear Growth?
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A corn seed, which consists of an embryo and a foos supply. In Linear growth a fixed number of cells reproduce in each generation. In the meristem case only two cells reproduce in each generation. You add two each generation.
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How do you calculate the Population Size (N) with a population experiencing linear growth?
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N= ct + No
N= Population size c= rate of increase (dN/dT) constant No= Initial Population Size |
