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14 Cards in this Set
- Front
- Back
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the young have a high survival rate and typically live a long life
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Type I curve
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individuals have a relatively constant death rate throughout their life span
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Type II curve
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curve includes those species that have a large number of young-most of which die at a high rate, at an early age-but have a lower death rate at later ages
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Type III curve
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Population dynamics
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variations in population size
includes births, deaths, immigration and emigration |
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Exponential growth model
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The rate of population increase under ideal conditions,called exponential growth
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Explain the following equation:
G=rN |
G stands for the growth rate of the population
N is the population size r stands for per capita increase |
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How do we estimate the per capita rate of increase using the example from the text?
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Suppose a population of rabbits has 100 individuals, and there are 50 births and 20 deaths in one month. The net increase is 30 rabbits. r equals the net increase divided by the population size. In this case r=0.3
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What does K stand for in the logistic growth model
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Carrying capacity- the maximum population size that a particular environment can sustain.
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G = rN (K - N) / K
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Logistic growth model
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A description of idealized population growth that is showed by limiting factors as the population size increases.
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Logistic growth model
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Define limiting factors
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Environmental factors that restrict population growth
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What does the logistic growth model suggest to us about real populations in nature?
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The model predicts that a population's growth rate will be small when the population size is either small or large.
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(K – N) / K
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Limiting factors
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What are the main causes boom-and-bust cycles?
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Food supply and predator-prey relationships
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