2.2 Flashcards
How is Population growth determined from birth, death, immigration, and emigration?
It determines the growth rate per capita, and how dense the population is.
What does a exponential graph look like?
It goes up slowly at first, and then speeds up and becomes vertical
What does a logistic graph look like?
It starts out slow, goes up fast, then levels out at the carrying capacity.
Where is population growth highest in a exponential graph?
Where the slope is steepest
Where is population growth highest in a logistic graph?
Where the slope is the highest
What does N mean?
Population size
What does N0 mean?
Initial population size
What does r mean?
Per Capita growth rate
What does K mean?
Carrying capacity
What does t mean?
time
What does dN/dt mean?
growth rate
What is a density dependent limiting factor?
It only impacts the population based on the density. Normally biotic
What is a density independent limiting factor?
Impacts the population no matter the density. Normally abiotic
How does a exponential growth model change when r is changed?
It is steeper sooner
How does a exponential growth model change when N is changed?
There are more organisms, so it could increase at a higher rate.
How does a exponential growth model change when K is changed?
Carrying capacity has no affect on exponential growth models
How does a logistic growth model change when r is changed?
It makes it increase faster
How does a logistic growth model change when N is changed?
There are more organisms, so it could increase at a higher rate.
How does a logistic growth model change when K is changed?
The point where the graph levels off is higher
A lack of food prevents a certain population from growing any further.
Logistic
The larger the population gets, the faster if grows.
Exponential
Can happen in ideal environments with few limiting factors
Exponential
Population Growth is slow right at the beginning and when the population nears carrying capacity
Logistic
