life table Flashcards
1
Q
x
A
age class
2
Q
nx
A
number of individuals alive
3
Q
lx
A
nx/n0 survivorship
age 0: =1
age oldest:=0
4
Q
mx
A
age-specific mortality rate
[nx-n(x+1)]/nx
5
Q
sx
A
age specific survival rate
1-mx
6
Q
Lx
A
[lx+ l(x+1)]/2
individuals that die halfway between two ages
7
Q
Tx
A
the sum of Lx values
8
Q
ex
A
age-specific life expectancy
Tx/lx
the mean lifetime remaining for individuals
9
Q
bx
A
age-specific fecundity
half the clutch/litter size produced by two breeding adults
the avg # of offspring produced by each individual during age x
10
Q
Rx
A
R0= net replacement rate
r=1: population is constant
r>1: population is increasing
r<1: population is decreasing
