3.5 Pop growth and resource availability Flashcards
Population Dynamics
The STUDY of factors that cause a population to increase or decrease
Immigration
People going into a country
Emigration
People leaving a country
Population change equation
(Birth +immgration) - ( Death + Emigration) = population change
Limiting factors
resource that a population cannot live without
When demand for resource > supply
Examples predators, Diease or lack of food or water.
Internal Factors
Acts WITHIN the population
mostly territorial animals like competion
External factor
Come from OUTSIDE the population
ex Spainish flu or lion eatting zebra
Density- Dependent factors
Factors that influence pop. growth based on size
food competion for habitat water light and sometimse disease
Density Independent Factors
Factor that influenece pop. growth independent of their size
ex natural disaters
Population Density formula
(populaion/ Density) = population density
What are the population Characteristics
Size
Density
Distribution
Age
Sex ratio
Pop characteristics
What is Size
Total # of indiviuals in a given area at a given time
Pop characteristics
What is Density
How many indivuals/ area
What does higher density lead to?
Pop characteristics
What is Distribution
How individual in pop. are spaced out compared to each other
Can be Random, Uniform or Clumped
Pop characteristics
What is Age
equates to the # of individuals are reproductive age
Reprodcutive age is 14-45
