26.6 Three-Stage Insect Model Equations
ADULT(t) ¼ ADULT(t À dt) + (MATURING À A_DYING) * dt
INIT ADULT ¼ 10 {Number of Adults}
INFLOWS:
MATURING ¼ MLSF*LARVAE/TL {Adults per Time Period}
OUTFLOWS:
A_DYING ¼ (1 À MASF) * ADULT/DT
EGG(t) ¼ EGG(t À dt) + (BIRTHING À HATCHING À D_DYING) * dt
INIT EGG ¼ 0 {Number of Eggs}
INFLOWS:
BIRTHING ¼ EGG_LAY_RATE * ADULT {Eggs per Time Period}
OUTFLOWS:
HATCHING ¼ MESF * EGG/TE {Larvae per Time Period}
D_DYING ¼ (1-MESF) * EGG/DT {Eggs per Time Period}
LARVAE(t) ¼ LARVAE(t - dt) + (HATCHING À MATURING - L_DYING) * dt
INIT LARVAE ¼ 0 {Number of Larvae}
INFLOWS:
HATCHING ¼ MESF * EGG/TE {Larvae per Time Period}
OUTFLOWS:
MATURING ¼ MLSF * LARVAE/TL {Adults per Time Period}
L_DYING ¼ (1 À MLSF) * LARVAE/DT {Larvae per Time Period}
EASF ¼ .5 {Experimental adult survival per time step.}
EESF ¼ .7 {Experimental egg-larvae survival rate, 1/stage.}
EGG_LAY_RATE ¼ 0.6 {eggs/adult/day. Try 1.112}
ELSF ¼ .8 {Experimental larvae-adult survival rate, 1/stage.}
MASF ¼ EXP(LN(EASF)/TA * DT)
MESF ¼ EXP(LN(EESF)/TE * DT)
MLSF ¼ EXP(LN(ELSF)/TL * DT)
TA ¼ 1
TE ¼ 8
DOCUMENT: DAYS.
TL ¼ 3
DOCUMENT: DAYS
26.6 Three-Stage Insect Model Equations
221