Studied by 1 person
Population density
number of organisms in a given area
Dispersion
how organisms are arranged in an environment
Density dependent factor
Biotic factor that limits a population more as population density increases
Density independent factor
Abiotic limiting factor that affects all populations in similar ways, regardless of population size
Population growth rate
explains how fast a given population grows
Emigration
the number of individuals moving away
Immigration
the number of individuals moving into a population
Carrying capacity
Largest number of individuals of a population that a environment can support
Demography
the study of human population size, density, distribution, movement, and birth and death rates
Demographic transition
change in a population from high birth and death rates to low birth and death rates
zero population growth
when the birth rate equals the death rate
Age structure
number of males and females of each age in a population
Uniform dispersion
Black bears are an example of
Clumped dispersion
Bison are an example of
Random dispersion
Deer are an example of
Population Range
Where organisms can live
Spacial Distribution
dispersion of organisms
Examples of Density dependent factors
disease, competition, parasites
Examples of Density independent factors
Weather, drought, earthquakes
Exponential growth
J shaped curve
Logistic growth
s shaped curve
Logistic growth
K strategy
Exponential growth
R strategy
Population growth rate
(Birth rate + Immigration)
Pre reproductive
0
Reproductive
20
Post reproductive
45+
Rapid growth rate
Kenya
Negative growth rate
Germany
Slow growth rate
USA
