Population Growth Flashcards
What does the variable N stand for?
Population size
What happens when there are equal part births and immigration?
The population stays the same
What does the variable K stand for?
Carrying capacity
T/F?
Carrying capacity is located in logistic growth and exponential growth models
True
Where is carrying capacity found?
Where the lines meet/when it is zero
Where is population growth the highest in exponential growth?
When the population is growing its quickest
What does the variable r stand for?
Maximum per Capita growth rate
Where is population growth the highest in logistic growth?
The peak of the line
What is density-dependent?
A major impact on growth that occurs when a population is more dense
What are some factors for density-dependent?
- Dieseses/Parasites
- Predators
What does the variable N0 stand for?
Euler’s number, mathematical constant
What is density-independent?
A major impact on growth that has nothing to do with population density, tend to be abiotic
What are some factors of density-independent?
- Seasonal Cycles
- Pollutants in environment
- Food limitation
What does the variable dN/dt stand for?
Population growth rate
How does an exponential growth model change when r changes?
Why?
It changes by the rate in which the population grows because it is the variable that shows the maximum growth rate
What would happen if death rates and immigration both grow?
There would be a large decrease in population growth
How would a logistic model change when K is changed? Why?
This causes the model to have a longer or shorter duration to grow because it gives the limit to how many individuals can grow before they start to decrease
How would an exponential model change if N was changed? Why?
When changed, the number that the population starts at can either be greater or less because it is the original population size
How would a logistic model change if r was changed? Why?
When changed the time period when it gets to a flat line either gets quicker or shorter because the amount of individuals grows faster, causing the max capacity to be reached quicker
How would a logistic model change if N was changed? Why?
When changed, this also causes the time reaching a stop either goes up or down but at a slower rate. This is because it also causes there to either be more or less people already occupying the area with the carrying capacity limit
