12.5. Questions and Tasks
247
Female_Born = 0.4 *Otters_Born {otter}
Adult_Female_Eat-per_Month =
(.3*Ave_Wt_Adult_Female)*Female_4l7*30 {kg /month}
Adult_Male_Eat-per_Month =
(.3*Ave_Wt_Adult_Male)*Male_5l7*30 {kg /month}
Ave_Wt_Adult_Female = 21 . 5 {kg}
Ave_Wt_Adult_Male = 32 . 8 {kg}
Ave_Wt_Juv_Female = 11 .8 {kg}
Ave_Wt_Juv_Male = 11 .8 {kg}
Carrying_Cap = 30 {otters}
Juv_Female_Eat-per_Month =
(.3*Ave_Wt_Juv_Female)*Female_14*30 {kg /month}
Juv_Male_Eat-per_Month = (.3 *Ave_Wt_Juv_Male) *Male_15
*30 {kg /month}
Kg_Urchin_consumed = . 8 *To t a l _ k g_ Ea t e n _ Pe r _ Mon t h {kg}
Month = COUNTER(l, 13) {month}
Repro_Otters = Male_517 + Female_417
Total_kg_Eaten_Per_Month = Adult_Male_Eat-per_Month +
Adult_Female_Eat-per_Month + Juv_Female_Eat-per_Month +
Juv_Male_Eat-per_Month
Total_Otters = Female_01 + Female_14 + Female_417 +
Male_01 + Male_15 + Male_517
Total_Otter_Females = Female_01 + Female_14 +
Female_417
Total_Otter_Males = Male_01 + Male 15 + Male 517
Birth_Rate = GRAPH(Month)
(1.00 ,0.0048 ) , (1.92,0.0072), (2 .83,0.0088), (3.75,
0.0088), (4.67 , 0 .0112), (5 .5 8, 0.0256), (6 .50 , 0.16),
(7 .42 ,0.16), (8.33,0.0224 ), (9 .25,0 .0176), (10.2,
0.0104) , (11.1 , 0 .008) , (12.0, 0.0048)
Urchin3640
Dead_8{t) = Dead_8(t-dt) + (die_8) * dt
INIT Dead_8 = 0 {urchin}
INFLOWS :
die_8 = (nat_death_rate*Urchin_3640) + number3640eaten
{urchin /month}
Urchin_3640(t) = Urchin_3640{t-dt) + (to_3640-to_4145die_8) * dt