Also included is death rate associated with abiotic factors. This is a stochastic
weather function based on a normal distribution with a mean of 0 and an SD of 0.67:
Normal Env ¼ Normal 0; :67
ð
Þ
ð39:1Þ
When incorporated into the outflow that specifies deaths from abiotic influences,
we assume that between 0 and 24 % of the population can be lost to weather each
year in the standard model conditions:
Env Cond ¼ If Normal Env > 0 AND Normal Env
< :95 THEN Normal Env à :25 ELSE 0
ð39:2Þ
Fig. 39.2
39.1 Quail Model
359
weather function based on a normal distribution with a mean of 0 and an SD of 0.67:
Normal Env ¼ Normal 0; :67
ð
Þ
ð39:1Þ
When incorporated into the outflow that specifies deaths from abiotic influences,
we assume that between 0 and 24 % of the population can be lost to weather each
year in the standard model conditions:
Env Cond ¼ If Normal Env > 0 AND Normal Env
< :95 THEN Normal Env à :25 ELSE 0
ð39:2Þ
Fig. 39.2
39.1 Quail Model
359