Chapter 5: Stochasticity in Growth Rates Flashcards
1
Q
discrete (geometric) growth rate λ
A
the ratio of abundance in year t+1 (Nt+1) to abundance in year t (Nt)
2
Q
λ =
A
Nt+1 / Nt
3
Q
NT =
A
N0 * λ^T
4
Q
continuous (exponential) growth rate
A
the instantaneous per capita growth rate
5
Q
discrete (geometric) growth rate equations
A
λ = Nt+1 / Nt
NT = N0 * λ^T
6
Q
r =
A
ln(λ)
7
Q
λ =
A
e^r
8
Q
continuous (exponential) growth rate equations
A
r = ln(λ)
λ = e^r
9
Q
when use an exponential growth model for wild populations?
A
- in newly established populations
- populations recovering from catastrophic declines
- invasive, pest outbreaks
10
Q
population growth is often variable
A
stochastic
11
Q
2 population growth variances
A
- sample variance
- process variance
12
Q
which variance is visualized with error bars?
A
sample variance
13
Q
what causes stochasticity in growth rate over time?
A
- sample variance
- process variance
14
Q
stochasticity
A
variation or bounce
15
Q
sample variance
A
- aka observational error
- nature isn’t varying, but our estimation error makes it seem like it is
