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Eco Evo Exam 3(c.12)


Demography The study of populations.
Growth rate In a population, the number of new individuals that are produced in a given amount of time minus the number of individuals that die.
Intrinsic growth rate (r) The highest possible per capita growth rate for a population.
Exponential growth model A model of population growth in which the population increases continuously at an exponential rate.
J-shaped curve The shape of exponential growth when graphed.
Geometric growth model A model of population growth that compares population sizes at regular time intervals.
Doubling time The time required for a population to double in size.
Density independent Factors that limit population size regardless of the population's density.
Density dependent Factors that affect population size in relation to the population's density.
Negative density dependence When the rate of population growth decreases as population density increases.
Positive density dependence When the rate of population growth increases as population density increases. Also known as inverse density dependence or the Allee effect.
Self-thinning curve A graphical relationship that shows how decreases in population density over time lead to increases in the size of each individual in the population.
Carrying capacity (K) The maximum population size that can be supported by the environment.
Logistic growth model A growth model that describes slowing growth of populations at high densities.
S-shaped curve (sigmoidal curve) The shape of the curve when a population is graphed over time using the logistic growth model.
Inflection point The point on a sigmoidal growth curve at which the population achieves its highest growth rate.
Age structure In a population, the proportion of individuals that occurs in different age classes.
Life tables Tables that contain class-specific survival and fecundity data.
Stable age distribution When the age structure of a population does not change over time.
Generation time (T) The average time between the birth of an individual and the birth of its offspring.
Cohort life table A life table that follows a group of individuals born at the same time from birth to the death of the last individual.
Static life table A life table that quantifies the survival and fecundity of all individuals in a population during a single time interval.
Created by: BriawnaW