Chapter 8: Population Density
Terms in this set (21)
A group of individuals of the same species that live in the same geographic area at the same time.
The number of individuals of a species per unit of area or volume at a given time.
The rate of change of a population's size, expressed in percent per year.
Movement from one region or country to another.
Individuals enter a population and increase its size.
Individuals leave a population and decrease its size.
Exponential Population Growth
The accelerating population growth that occurs when optimal conditions allow a constant reproductive rate over a period of time.
Intrinsic Rate of Increase
The exponential growth of a population that occurs under ideal conditions.
Negative Feedback Mechanism
A change in some condition triggers a response that counteracts, or reverses, the changed condition.
The maximum number of individuals of a given species that a particular environment can support for an indefinite period, assuming no changes in the environment.
Logistic Population Growth
When a population affected by environmental resistance is graphed over a long period, the curve has the S shape.
An abrupt decline from high to low population density.
An environmental factor whose effects on a population change as population density changes.
An environmental factor that affects the size of a population but is not influenced by changes in population density.
Traits that contribute to a high population growth rate.
Traits that maximize the chance of surviving in an environment where the number of individuals is near the carrying capacity of the environment. These do not produce large numbers of offspring.
Shows the likelihood of survival for individuals at different times during their lives.
The proportion of newborn individuals that are alive at a given age.
A set of local populations among which individuals are distributed in distinct habitat patches across a landscape.
Habitats that increase the likelihood of survival and reproductive success for the individuals living there.
Lower-quality habitats that are areas where the local birth rate is less than the local death rate.
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