2.2 Study Guide Flashcards
How is population determined by births, death, immigration, and emigration?
They determine how many are in a population. They consider how many are born, how many leave the place/area, how many enter the place/area, and how many pass away. All of these determine if the population is increasing or decreasing.
How do you show exponential on a graph?
The line/curve keeps going up towards the top of the graph.
How do you show logistic on a graph?
The line/curve increases to a certain point, then remains straight or where it’s at.
What do the variables N, K, r, and t stand for?
N: Population size.
K: Carrying capacity.
r: Maximum per capita growth rates.
t: Time.
What do the variables N^0 and dN/dt stand for?
N^0: The initial population size.
dN/dt: Population growth rate.
What are density-dependent limiting factors?
Effect is dependent on the density of the population.
What are density-independent limiting factors?
Effect is not related to/is independent of the density of the population.
Please provide examples of density-independent limiting factors.
- Drought.
- Flood.
Please provide examples of density-dependent limiting factors.
- Competition for water.
- Infectious disease.
What kind of graph would show the following definition: The line/curve keeps going up towards the top of the graph?
Exponential.
Why and how do exponential growths change when the given variables N and/or r change.
r: If the value increases or decreases, then so does the graph, and vice versa. This is because it’s capita per individual in the population.
N: The population’s growth rate increases over time, in proportion to the size of the population. J-shaped.
Why and how do logistic growths change when the given variables N and/or K change.
K:
N: The population’s growth rate increases over time, in proportion to the size of the population. S-shaped.
