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20 Cards in this Set
- Front
- Back
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What factors affect population size?
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birth rate
immigration rate death rate emigration rate |
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What is the exponential growth model?
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The exponential growth model describes population growth in an ideal environment.
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What is carrying capacity?
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Carrying capacity (k) is the maximum population size that a specific environment can support.
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Which factors determine "k" for a habitat supporting an elephant population?
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rain fall
nutrients, minerals, mineral salts disease parasitism predation |
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What is the density-dependent (logistic) growth model?
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The density-dependent (logistic) growth model accounts for the reduced growth rate as a population approaches the carrying capacity (k) of its environment.
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When does a population stop increasing in a density-dependent (logistic) growth model?
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A population theoretically stops increasing when it reaches its carrying capacity.
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When should the exponential model NOT be used?
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The exponential growth model should not be used when the population has a defined carrying capacity.
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When should the logistic model be used?
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The logistic model should be used when a habitat has a defined carrying capacity.
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Which model accounts for the reduction in growth rate that occurs when a population approaches the carrying capacity of its environment?
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the logistic model
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What is the only factor that limits growth in an ideal environment (exponential growth model)?
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Maximal reproductive rate is the only factor that limits growth in an ideal environment.
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Density-dependent factors affect birth and death rate.
Increasing density usually results in-- |
reduced birth rate
increased death rate |
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What are the causes of density-dependent regulation?
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competition among individuals for limited food
infectious disease and parasitism predation accumulation of toxic metabolism wastes |
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Increased stress at high density reduces--
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birth rate
effective parenting behavior immune system difficiency |
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As population density increases, birth rate _______.
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decreases
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As population density increases, death rate ________.
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increases
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What is the common equation for computing a change in population size?
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∆N/∆t = r x N
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What does ∆N stand for?
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the change in population size
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What does ∆t stand for?
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the time interval
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Which factors determine the carrying capacity of an environment?
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food availability, space, predation, etc.
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How do metabolic waste products affect the growth rate of microbial populations?
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Microbial growth rates decline as their output of metabolic wastes increases at high densities.
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