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20 Cards in this Set

  • Front
  • Back
What factors affect population size?
birth rate
immigration rate
death rate
emigration rate
What is the exponential growth model?
The exponential growth model describes population growth in an ideal environment.
What is carrying capacity?
Carrying capacity (k) is the maximum population size that a specific environment can support.
Which factors determine "k" for a habitat supporting an elephant population?
rain fall
nutrients, minerals, mineral salts
What is the density-dependent (logistic) growth model?
The density-dependent (logistic) growth model accounts for the reduced growth rate as a population approaches the carrying capacity (k) of its environment.
When does a population stop increasing in a density-dependent (logistic) growth model?
A population theoretically stops increasing when it reaches its carrying capacity.
When should the exponential model NOT be used?
The exponential growth model should not be used when the population has a defined carrying capacity.
When should the logistic model be used?
The logistic model should be used when a habitat has a defined carrying capacity.
Which model accounts for the reduction in growth rate that occurs when a population approaches the carrying capacity of its environment?
the logistic model
What is the only factor that limits growth in an ideal environment (exponential growth model)?
Maximal reproductive rate is the only factor that limits growth in an ideal environment.
Density-dependent factors affect birth and death rate.

Increasing density usually results in--
reduced birth rate
increased death rate
What are the causes of density-dependent regulation?
competition among individuals for limited food

infectious disease and parasitism


accumulation of toxic metabolism wastes
Increased stress at high density reduces--
birth rate
effective parenting behavior
immune system difficiency
As population density increases, birth rate _______.
As population density increases, death rate ________.
What is the common equation for computing a change in population size?
∆N/∆t = r x N
What does ∆N stand for?
the change in population size
What does ∆t stand for?
the time interval
Which factors determine the carrying capacity of an environment?
food availability, space, predation, etc.
How do metabolic waste products affect the growth rate of microbial populations?
Microbial growth rates decline as their output of metabolic wastes increases at high densities.