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Module: SimMasto0h - Février 2011 – J.Le Fur/J.-E.Longueville

MEMO 05. Sensitivity analysis of (i) population max size and (ii) time before extinction to the rodent agents’ longevity parameter and three types of domain heterogeneity. Module: SimMasto0h - Février 2011 – J.Le Fur/J.-E.Longueville.

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Module: SimMasto0h - Février 2011 – J.Le Fur/J.-E.Longueville

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  1. MEMO 05 Sensitivity analysis of (i) population max size and (ii) time before extinction to the rodent agents’ longevity parameter and three types of domain heterogeneity. Module: SimMasto0h - Février 2011 – J.Le Fur/J.-E.Longueville

  2. Simulation contextExample: Homogeneous surface, t=239 Children (getting old) Female adult Male adult Reproduction occurs if mature male and female encounter within reproduction season

  3. Two types of landscape heterogeneity Homogeneous test grid (serie name: homogene) Heterogeneous (viz. fields) test grid (serie name: grilleTest) Whole domain simulated

  4. Example of one run : longevity = 153 (about 6 months simulated), homogeneous environment, N0=200) phase with no reproduction extinction (t=580) Parents maturation

  5. Variability of maximum population size and extinction time for differing value of rodent agents’ longevity one run Viability (pullulation) longevity = 160 N0 = 200 incomplete season 5th season 1 season 4th season 3nd season 2nd season 1st season 2 to 5 seasons Threshold longevity where pullulation occurs given a N0=200 Bifurcation, Phase transition

  6. Longevity = 160: Viable/pullulating population Single peak = ?

  7. Viable/pullulating population (cont.): heterogeneous environment longevity:160,tick=1819 longevity:159,tick=1401

  8. Similar envelopes of variation obtained for the two types of landscape : Max population Extinction time No visible effect on maximum population size nor tick of population extinction

  9. Varying domain heterogeneity Homogeneous test grid Spotted (viz. colonies) test grid : validation No visible effect on maximum population size nor tick of population extinction (longevity = 153) Note: more simulation is necessary for the spotted field test case Heterogeneous (fields) test grid Whole field simulated

  10. 17.02.11 - simulation SimMasto_0h – simulation conditions • 1 tick = 1 minute (temporary, in fact 1min assimilated to one day) • REPRO_START_Utick = 91; • REPRO_END_Utick = 305; • ANNUAL_CYCLE_Utick = 365 • MALE = 0; • MALE_SEXUAL_MATURITY = 60; • MALE_SEXUAL_MATURITY_TIME_UNIT = "minute"; // Rattus rattus 75 day • FEMALE = 1; • FEMALE_SEXUAL_MATURITY = 60 • FEMALE_SEXUAL_MATURITY_TIME_UNIT = "minute"; // Rattus rattus 75 day • GESTATION_LENGTH = 21; • GESTATION_LENGTH_TIME_UNIT = "minute"; //"day"; • LITTER_SIZE = 2; • MATING_LATENCY = 0; • MATING_LATENCY_TIME_UNIT = "minute"; • NUMBER_OF_AGENTS = 200; • CELL_WIDTH_UMETER = 4.473; // m.px^-1 Un pixel d'un raster = une cellule d'une matrice • UCS_WIDTH_UMETER = 4.473; // m.cs^-1 Facteur de conversion unité de continuous space => mètres. • SPACE_CELL_SIZE_UCS = 1; // cs.cell^-1 (float) PIXEL_WIDTH_UMETER; • raster_url ="data_raster/grille-test.1a.txt";

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