Crocodylus niloticus: Population traits

at T = 22 °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_min f_max date: 2025/05/23
symbol units thinning falsethinning true thinning falsethinning true description
femalemale femalemale femalemale femalemale
f - 0.534163 0.534163 0.542483 0.542483 1 1 1 1 scaled functional response
r 1/d 0 0 0 0 0.000792889 0.000792889 0.000199424 0.000199424 spec pop growth rate
t2 d NaN NaN NaN NaN 874.204 874.204 3475.74 3475.74 population doubling time
a_b d 325.798 324.062 325.52 323.806 317.052 316.063 317.052 316.063 age at birth
t_p d 34454.5 10907.9 18122.4 10400.2 5491.97 5185.09 5491.97 5185.09 time since birth at puberty
S_b - 0.999999 1 0.999999 1 1 1 1 1 survival probability at birth
S_p - 0.999997 0.999998 0.318815 0.312318 0.999998 0.999998 0.287418 0.283875 survival probability at puberty
theta_0b - 0.00827828 0.00790278 0.318277 0.333158 0.222264 0.221649 0.504298 0.50844 frac of ind that is embryo
theta_bp - 0.00828003 0.00790444 0.178506 0.185025 0.172885 0.172545 0.254377 0.255035 fraction of individuals that is juvenile
theta_pi - 0.983442 0.984193 0.503217 0.481817 0.604852 0.605806 0.241325 0.236525 frac of ind that is adult
L_bi cm 17.6172 19.3534 10.173 10.5201 6.74677 6.88691 4.80134 4.80598 mean structural length of post-natals
L2_bi cm^2 324.341 392.43 158.453 177.807 64.6771 68.1074 44.0182 44.941 mean squared structural length of post-natals
L3_bi cm^3 6083.29 8113.58 2831.09 3489.73 801.834 878.141 690.833 737.725 mean cubed structural length of post-natals
Ww_bi g 50535.4 73617.8 23840.8 32102.5 11770.8 14150.5 10141.3 11887.8 mean wet weight of post-natals
L_pi cm 17.7459 19.49 12.9961 13.7055 7.99298 8.16591 7.47983 7.5441 mean structural length of adults
L2_pi cm^2 327.025 395.536 212.874 244.133 81.485 85.8185 84.8553 87.6742 mean squared structural length of adults
L3_pi cm^3 6134.39 8178.64 3831.19 4825.23 1026.77 1123.96 1405.63 1519.33 mean cubed structural length of adults
Ww_pi g 50959.9 74208 32262.7 44388 15072.8 18111.6 20634.4 24482.7 mean wet weight of adults
R 1/d 0 0.0288483 0 0 0 0 0 0 mean reproduction rate of adults
J_X g/d 51.3058 68.5849 25.4553 31.5594 19.1532 22.2837 13.0353 14.704 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 0.109375 0.109375 yield of faeces on food
Y_VX mol/mol 0 0 0 0 0.0331937 0.0312456 0.0105689 0.0100055 yield of living structure on food
Y_VX_d mol/mol 0.00373641 0.00361205 0.00894756 0.00862777 9.82112e-06 8.36815e-06 0.0191016 0.018153 yield of dead structure on food
Y_EX mol/mol 0 0 0 0 0.454084 0.47225 0.14458 0.151224 yield of living reserve on food
Y_EX_d mol/mol 0.0273029 0.0291615 0.0664004 0.0707403 0.000134351 0.000126477 0.261307 0.274366 yield of dead reserve on food
Y_CX mol/mol 0.698413 0.697004 0.662413 0.659146 0.327602 0.314433 0.369742 0.354962 yield of CO2 on food
Y_HX mol/mol 0.742587 0.741088 0.704309 0.700836 0.348323 0.33432 0.393128 0.377413 yield of H2O on food
Y_OX mol/mol -0.886448 -0.884659 -0.840754 -0.836609 -0.415803 -0.399088 -0.469288 -0.450529 yield of O2 on food
Y_NX mol/mol 0.161172 0.160847 0.152864 0.152111 0.0756005 0.0725614 0.0853252 0.0819144 yield of N-waste on food
mu_TX J/mol 447750 446806 424046 421856 202389 193525 230263 220349 yield of heat on food

Remarks

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