10.5. Questions and Tasks
211
P_ADULT_IMMIGRANTS(t ) = P_ ADULT_ I MMI GRANTS( t - d t) +
(P_ADT_IMM-P_LIFESPAN_ADT_IMM-DIE_P_ADT_IMMIGRANTS) *
dt
IN IT P_ADULT_IMMIGRANTS = 0
INFLOWS:
P_ADT_IMM = POLY_ADULTS *P_ADT_ADVECTION*SIZE_FACTOR* (1P_ADULT_IMMIGRANTS /POLY_ADULTS)
OUTFLOWS:
P_LIFESPAN_ADT_IMM
P_ADULT_IMMIGRANTS*INST_SURV_P_ADT*(l /P_ADULT_STAGE_DUR
ATION)
DIE_P_ADT_IMMIGRANTS = (1 -
INST_SURV_P_ADT)*P_ADULT_IMMIGRANTS/DT
INST_SURV_P_ADT =
EXP(LOGN(P_ADULT_SURVIVORSHIP) * (l /P_ADULT_STAGE_DURATIO
N) *DT )
P_ADT_ADVECTION = 0
Polydora Juvenile Immigrants Module
POLY_JUVENILES(t)
INIT POLY_JUVENILES
POLY_JUVENILES (t-dt)
1 0 0 0
P_JUV_IMMIGRANTS(t)
P_JUV_IMMIGRANTS(t-dt) +
(P_JUV_IMM-DIE_P_JUV_IMMIGRANTS-MATURE_P_JUV_IMM) * dt
INIT P_JUV_IMMIGRANTS = 0
INFLOWS:
P_JUV_IMM = POLY_JUVENILES *P_JUV ADVECTION*SI ZE FACTOR*
(l-P_JUV_IMMIGRANTS /POLY_JUVENILES )
OUTFLOWS :
DIE_P_JUV_IMMIGRANTS = (1INST_SURV_P_JUV)*P_JUV_IMMIGRANTS /DT
MATURE_P_JUV_IMM =
P_JUV_IMMIGRANTS*INST_SURV_P_JUV*(l /P_JUVENILE_STAGE_DU
RATION)
P_MATURE_IMMIGRANT_ADULTS(t) =
P_MATURE_IMMIGRANT_ADULTS (t-dt ) + (MATURE_P_JUV_IMMDIE_P_ADULT_2-P_LIFESPAN_2 ) * dt
INIT P_MATURE_IMMIGRANT_ ADULTS = 0