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29 Cards in this Set

  • Front
  • Back
the collection of a specific species of organisms in a given geographic region
a measurement of the number of organisms per unit area
the processes by which a species maintains or expands the distribution of a population
geographical range
the geographic area in which a population lives
clumped dispersion
organisms are grouped together around an area. most common in nature
random dispersion
species are spread out with no particular pattern
uniform dispersion
organisms are spread evenly throughout an area
the study of the past and present distribution of species
the study of statistics relating to births and deaths in populations
age structure
the relative number of individuals of each age in a population
the potential reproductive capacity of an organism or population
generation time
the time between an organism gives birth and when their mature offspring gives birth
life table
shows for a person of each age the likelihood that they will die before their next birthday
a group of organisms of the same species and of roughly the same age
survivorship curve
a plot of the number of members of a cohort that are still alive at each age; one way to represent age-specific mortality
life history
traits that affect schedual of birth, death, and reproduction
where organisms invest most of their energy in growth and reproduction, have one large reproductive effort, adn then die.
where organisms produce fewer offspring over a span of many seasons
intrinsic rate of increase
the difference between the number of births and the number of deaths; rmax; the maximum population growth rate
exponential population growth
geometric increase in a population under ideal conditions
carrying capacity
the maximum population that can be supported by the available resources; or K
logistic population growth
model that levels off as population size approaches K
density-dependent factor
a factor that influences population regulation that has a greater impact as population density increases
Allee effect
small populations that don't follow exponential growth; random event more likely to destroy population
intraspecific competition
where members of the same species compete among eachother for resources
the defense of a well bounded physical space
density-independent factor
a factor influencing population regulation that acts to reduce population by a constant percentage
r-selected species
found in variable environments or open habitats with little competition; short generation time
K-selected species
found in fairly stable environments and have a longer generation time