Chapter 11: Population Growth and Regulation Flashcards
(23 cards)
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 (Nt=N0ert)
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 (N1=N0lamda)
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 limiting population size regardless of the population’s density
Densiy depenedent
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 (Allee Effect)
when the rate of population growth increases as population density increases
Self-Thinning Curve
A graphical relationship that shows how decreases in population density over time lead to increases in the mass 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
the shape of the curve when a population is graphed over time using the logistic growth model
Inflecion 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 diffferent age classes
Life Table
tables that contain class-specific survival and fecundity data
Stable Age Distribution
when the age structure of a population does not change over time
Net Reproductive rate
the total number of female offspring that we expect an average female to produce over the course of her life
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 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
