lec 7- population dynamics cont.

Question 1

what model is used when a population is growing unchecked?

Answer 1

density-independent model

Question 2

what are the two types of density independent models?

Answer 2

-geometric (discrete time points in a population vs time graph)
-exponential (time is continuous in a population vs time graph)

Question 3

how is geometric growth calculated?

Answer 3

Nt+1 = Nt lambda
lambda = rate of geometric population

Question 4

how is exponential growth calculated?

Answer 4

rate of change of population/ time = rN
r = rate of growth per individual
or Nt = N0e^rt

Question 5

what is formula for r?

Answer 5

r = ln (lambda)

Question 6

what limits population growth?

Answer 6

density dependent (species limit each other over) = food/prey, water, shelter, disease, mates
density independent
density independent = weather and climate

Question 7

what is carrying capacity?

Answer 7

max number of individuals that can be supported in environment

Question 8

how is logistic population growth calculated?

Answer 8

change in population over time = K/(1 + ((K - N)/N) x e^rt)