Psammophis sibilans: Population traits

at T = 26.5 °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: 2025/09/13
symbol units thin falsethin truethin falsethin truethin falsethin truedescription
f - 0.576629 0.6645 0.83225 0.83225 1 1 scaled functional response
r 1/d 0 0 0.00266553 0.000353902 0.0033251 0.00049172 spec pop growth rate
t2 d NaN NaN 260.041 1958.59 208.459 1409.64 population doubling time
a_b d 75.206 74.7887 74.2279 74.2279 73.8497 73.8497 age at birth
t_p d 1430.12 762.353 546.38 546.38 467.634 467.634 time since birth at puberty
S_b - 0.999998 0.999998 0.999998 0.999998 0.999998 0.999998 survival probability at birth
S_p - 0.999983 0.369658 0.999985 0.342889 0.999986 0.325859 survival probability at puberty
theta_0b - 0.0222191 0.193295 0.179985 0.314412 0.217958 0.371634 frac of ind that is embryo
theta_bp - 0.0222227 0.115071 0.147692 0.176503 0.170519 0.202012 fraction of individuals that is juvenile
theta_pi - 0.955558 0.691634 0.672324 0.509085 0.611523 0.426354 frac of ind that is adult
L_bi cm 2.55569 2.55627 2.39411 2.56186 2.4237 2.58168 mean structural length of post-natals
L2_bi cm^2 6.64758 7.13424 6.53117 7.89109 6.93305 8.62859 mean squared structural length of post-natals
L3_bi cm^3 17.4629 20.7962 19.4329 26.7839 22.2488 33.2323 mean cubed structural length of post-natals
Ww_bi g 235.302 319.748 369.308 509.009 503.563 752.154 mean wet weight of post-natals
L_pi cm 2.59038 2.80796 2.6764 3.08054 2.78503 3.29264 mean structural length of adults
L2_pi cm^2 6.77538 8.13624 7.68954 10.2236 8.50269 12.1484 mean squared structural length of adults
L3_pi cm^3 17.8396 24.0552 23.3816 35.6194 28.0226 48.3307 mean cubed structural length of adults
Ww_pi g 240.377 369.855 444.351 676.92 634.242 1093.88 mean wet weight of adults
R 1/d 0 0.00551879 0.00426152 0.0144731 0.00712226 0.0216128 mean reproduction rate of adults
J_X g/d 3.80849 4.71016 5.40055 6.52505 6.88838 8.573 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 0.00959143 0.00145269 0.0107398 0.0019061 yield of living structure on food
Y_VX_d mol/mol 0.00155902 0.00346516 7.90478e-05 0.00419042 4.71035e-05 0.00453879 yield of dead structure on food
Y_EX mol/mol 0 0 0.172687 0.0261546 0.232336 0.0412351 yield of living reserve on food
Y_EX_d mol/mol 0.0194477 0.0498127 0.0014232 0.0754454 0.001019 0.0981889 yield of dead reserve on food
Y_CX mol/mol 0.706565 0.680345 0.574311 0.636498 0.525267 0.605114 yield of CO2 on food
Y_HX mol/mol 0.751254 0.723375 0.610635 0.676755 0.55849 0.643387 yield of H2O on food
Y_OX mol/mol -0.896794 -0.863514 -0.728933 -0.807863 -0.666686 -0.76803 yield of O2 on food
Y_NX mol/mol 0.163053 0.157003 0.132533 0.146884 0.121216 0.139642 yield of N-waste on food
mu_TX J/mol 453067 435709 365437 406630 332846 385780 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