Back One Page
Table 4. Life table parameters for adult Delphastus catalinae maintained under one of three constant temperature regimes
Temperature (ºC)
Parameter 22 26 30
Net Reproductive Rate (R0)1 121.23 129.437 51.439
Gross Reproductive Rate (GRR)2 205.257 196.563 65.608
Generation Time (T)3 100.01 80.76 47.94
Intrinsic Rate of Increase (r)4 0.048 0.0602 0.082
Finite Rate of Increase (λ)5 1.049 1.062 1.085
Doubling Time (DT)6 14.44 11.51 8.45

1 R0 = ∑ l x m x expressed in units of females/females egg numbers divided by 2 assuming 1:1 sex ratio
2 GRR = ∑ m x in females/females
3 T = (∑xl x m x ) / R0 in days
4 r = ln R0 / T in females/females/day
5 λ = exp(r) in females/females/day
6 DT = ln (2)/r in days
Back One Page