Formula Sheet Unit 1 Population Dynamics
D=N
S
Estimated population density = total number of individuals
sampling area
Estimated population size = (estimated population density)(total size of study area)
N = Mn
m
age-specific mortality rate = # that died during the interval
# alive at the start of the interval
age-specific survivorship rate = # still alive at the end of the interval
# alive at the start of the interval
probability of being alive = # of individuals alive at the start of the age interval
at a specific age
#alive at the start of the initial age interval
population change = (births + immigration) – (deaths + emigration)
population = (births + immigration) – (deaths + emigration) x 100
growth rate
initial population
b=B
N
d=D
N
= rN
td =
.