Varanus niloticus: Population traits

at T = 28.5 °C with background hazards for embryo, juv, adult: 0, 0, 0 1/d

Ln survival probability as function of age, with (dashed) and without (solid) thinning at max (red) and min (blue) scaled functional response for females.
Ln survivor function of the stable age distribution as function of age, with (dashed) and without (solid) thinning at max (red) and min (blue) scaled functional response for females.
model std f_minf f_max date: 2025/05/23
symbol units thin falsethin truethin falsethin truethin falsethin truedescription
f - 0.757378 0.797215 0.898607 0.898607 1 1 scaled functional response
r 1/d 0 0 0.00128265 0.000295811 0.00170187 0.000450275 spec pop growth rate
t2 d NaN NaN 540.401 2343.21 407.285 1539.39 population doubling time
a_b d 132.068 131.19 129.24 129.24 127.617 127.617 age at birth
t_p d 4202.62 2406.84 1582.1 1582.1 1274.63 1274.63 time since birth at puberty
S_b - 0.999989 0.999989 0.99999 0.99999 0.99999 0.99999 survival probability at birth
S_p - 0.999937 0.477099 0.999943 0.453674 0.999946 0.434624 survival probability at puberty
theta_0b - 0.0206263 0.184046 0.153459 0.293727 0.19556 0.343937 frac of ind that is embryo
theta_bp - 0.020632 0.126004 0.130044 0.18923 0.157411 0.213089 fraction of individuals that is juvenile
theta_pi - 0.958742 0.68995 0.716497 0.517043 0.647029 0.442974 frac of ind that is adult
L_bi cm 7.18907 6.13066 5.38226 5.29363 5.16879 5.01663 mean structural length of post-natals
L2_bi cm^2 53.4843 43.0383 33.2808 34.7367 31.3298 32.3701 mean squared structural length of post-natals
L3_bi cm^3 405.462 324.307 226.968 261.061 213.949 248.728 mean cubed structural length of post-natals
Ww_bi g 1097.55 906.986 686.623 789.762 696.126 809.287 mean wet weight of post-natals
L_pi cm 7.29144 6.81299 5.90987 6.34458 5.81707 6.25299 mean structural length of adults
L2_pi cm^2 54.5067 49.8392 38.1951 45.2747 37.4048 45.0205 mean squared structural length of adults
L3_pi cm^3 413.868 380.941 265.305 351.199 262.017 361.022 mean cubed structural length of adults
Ww_pi g 1120.3 1065.37 802.6 1062.45 852.525 1174.66 mean wet weight of adults
R 1/d 0 0 0 0 0 0 mean reproduction rate of adults
J_X g/d 6.60036 5.5906 4.87296 5.08612 5.10488 5.27439 mean ingestion rate of wet food by post-natals
Y_PX mol/mol 0.109375 0.109375 0.109375 0.109375 0.109375 0.109375 yield of faeces on food
Y_VX mol/mol 0 0 0.0597423 0.0151835 0.0713265 0.0212339 yield of living structure on food
Y_VX_d mol/mol 0.0121885 0.025796 0.000871792 0.0330439 0.000488695 0.0381257 yield of dead structure on food
Y_EX mol/mol 0 0 0.12099 0.0307495 0.160749 0.047855 yield of living reserve on food
Y_EX_d mol/mol 0.0208046 0.0463473 0.00176555 0.0669203 0.00110138 0.0859241 yield of dead reserve on food
Y_CX mol/mol 0.696826 0.665016 0.574645 0.605091 0.533779 0.566708 yield of CO2 on food
Y_HX mol/mol 0.740899 0.707077 0.61099 0.643362 0.56754 0.602551 yield of H2O on food
Y_OX mol/mol -0.884433 -0.844059 -0.729357 -0.768001 -0.677489 -0.719283 yield of O2 on food
Y_NX mol/mol 0.160806 0.153465 0.13261 0.139636 0.12318 0.130779 yield of N-waste on food
mu_TX J/mol 447116 426622 368206 387854 341563 362860 yield of heat on food

Remarks

  • Reprod-code O applies. Sex ratio is assumed to be 1:1. Parameters of male and female are the same.
  • Buffer handling rule: release each egg as soon as reproduction buffer allows
  • Weights of adults do not include reproduction buffer