Lecture 17: Modeling populations 2 Flashcards
What is geometric Population growth?
Each successive generation differs in size by a constant ratio.
What is Exponential population growth?
each successive
generation differs in size based on a constant ratio
times population size at that moment in time
Both geometric and exponential population curves are what shape?
J-shaped.
Life table’s and Fecundity data can be used to calculate what?
- Net reproductive rate
- Geometric rate of increase
- Generation time
- Per capita rate increase.
What do you use Geometric population growth modeling for?
Used for modeling population growth in
organisms with discrete generations.
What causes a discrete generations?
Caused by pulsed reproduction.
If you multiply Lamda (geometric rate of increase) by the population at any given time, you can calculate the ________
Ending population size.
What type of population growth model is used to examine populations with overlapping generations?
Exponential population growth model.
Do Geometric and exponential growth actually happen?
Yes, but only for shot periods of time when resources are very abundant.
Are Geometric and exponential growth realistic?
Both are rather unrealistic, this is because in reality per capita death rates will increase as densities increase, and birth rates will decrease as resources diminish.
Why wouldn’t exponential growth continue indefinitely?
Because resources aren’t unlimited
Why wouldn’t exponential growth continue indefinitely?
Because resources aren’t unlimited
If resources become limited, what happens to the population?
Population growth rate will slow and eventually stop.
What is it called when population growth slows and eventually levels off?
It is called, logistic population growth.
What is it called when population growth slows and eventually levels off?
It is called, logistic population growth.
