9.2 Population Growth Flashcards
B+I is greater then D+E
Positive growth
B+I is equal to D+E
No growth
B+I is less then D+E
Negative Growth
What is ‘r’
max per Capita rate of growth
how to find r
growth/indivdual
(births-deaths)/ original size of population
Find r: starting population has 20 fish. After one year 40 are born and 10 die.
1.5 growth/capita
Growth without limiting factors
Exponential
Can exponential growth occur forever?
No.
dN/dt=rN
equation for exponential growth
dN/dt
change in size/ change in time
what is ‘K’
carrying capacity- the max population supported without degrading of habitat.
dN/dt=rN (k-N)/K
equation for logistic growth
Logistic reaches the carrying capacity
as N approaches K
What happens when the slope reaches 1/2 k?
Maxiumin sustainable yield
effect dependent on density
density-dependent
effect not related/is independent of the density
density-independent
What would drought be?
density-dependent
