Population Ecology Exit Ticket
survivorship curve
Graph showing the number of survivors in different age groups for a particular species.
logistic growth
Growth pattern in which a population's growth rate slows or stops following a period of exponential growth
exponential growth
Growth pattern in which the individuals in a population reproduce at a constant rate
Population density
the number of individuals of a species per unit area or volume
Dispersion
the pattern of spacing among individuals within the boundaries of the population
Population Ecology
Allows scientists to determine the success of a species and its impact on the surrounding ecosystem
age structure or population profile
the percentage of the population that are particular age ranges (2% are age 2-4)
death rate
The number of deaths in a population in a certain amount of time
birth rate
The number of offspring born in a particular amount of time
(B + I) - (D + E)
a countries' growth rate
a map showing everywhere you can find meadow larks in North America
example of a range
50 coyotes in a mile
example of population density
predation, communicable diseases, starvation, parasites
examples of density dependent limiting factors
natural disasters, human disturbances, unusual weather
examples of density independent limiting factors
Nf = rNi
exponential growth rate equation
r
the symbol for growth rate
carrying capacity
found right at the top of a logistic growth curve
limiting factor
general term describing an event/organism that reduces a population's size
density independent limiting factors
limiting factor that affects all populations in similar ways, regardless of population size
density dependent limiting factors
limiting factors that are affected by the number of individuals in a given area
Nf = r Ni ((K-Ni)/K)
logistic growth equation
N
symbol for population size
geographic distribution
the area inhabited by a species (a.k.a. range)
growth rate
the change in size a population experiences in a given amount of time