Achatina achatina: Population traits

at T = 27 °C with background hazards for embryo, larva, juv, adult: 0, 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 abj f_minf f_max date: 2022/12/20
symbol units thin falsethin truethin falsethin truethin falsethin truedescription
f - 0.534722 0.695353 0.847677 0.847677 1 1 scaled functional response
r 1/d 0 0 0.00794189 0.000226381 0.0105035 0.000381544 spec pop growth rate
t2 d NaN NaN 87.2774 3061.86 65.9917 1816.69 population doubling time
a_b d 11.7306 11.2346 10.8693 10.8693 10.5711 10.5711 age at birth
t_j d 265.428 182.273 141.716 141.716 116.608 116.608 time since birth at metam
t_p d 2267.44 617.316 430.862 430.862 336.802 336.802 time since birth at puberty
S_b - 1 1 1 1 1 1 survival probability at birth
S_j - 0.999999 0.776017 0.999999 0.726942 0.999999 0.684156 survival probability at metam
S_p - 0.999839 0.0163389 0.999962 0.0156389 0.999975 0.0151925 survival probability at puberty
theta_0b - 0.00280412 0.178327 0.0825309 0.226284 0.104906 0.263443 frac of ind that is embryo
theta_bj - 0.00281399 0.15796 0.0758815 0.193756 0.0940704 0.218825 frac of ind between b and j
theta_jp - 0.0608542 0.535745 0.543908 0.500531 0.538045 0.45803 frac of ind between j and p
theta_pi - 0.933528 0.127968 0.297679 0.0794288 0.262979 0.0597022 frac of ind that is adult
L_bi cm 2.30973 0.789503 1.00928 0.686457 0.967902 0.643381 mean structural length of post-natals
L2_bi cm^2 5.60738 1.58359 1.70145 1.38339 1.61968 1.3336 mean squared structural length of post-natals
L3_bi cm^3 13.8331 4.7075 3.85718 4.82355 3.79017 5.33809 mean cubed structural length of post-natals
Ww_bi g 14.7607 5.11804 4.26725 5.33636 4.26553 6.00758 mean wet weight of post-natals
L_pi cm 2.42804 2.95959 2.02884 3.28541 2.05251 3.52323 mean structural length of adults
L2_pi cm^2 5.96396 9.2501 4.58623 11.9944 4.76019 14.528 mean squared structural length of adults
L3_pi cm^3 14.7575 29.7663 11.4284 46.2415 12.3743 64.8864 mean cubed structural length of adults
Ww_pi g 15.7472 32.3622 12.6434 51.1576 13.9263 73.0243 mean wet weight of adults
R 1/d 0 0.117445 0.0180125 0.260527 0.0489835 0.423817 mean reproduction rate of adults
J_X g/d 0.246416 0.0885526 0.118068 0.0945732 0.133196 0.10811 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 0.259455 0.0115462 0.298885 0.0188393 yield of living structure on food
Y_VX_d mol/mol 0.015873 0.0512937 7.70942e-05 0.0627266 4.35363e-05 0.0715975 yield of dead structure on food
Y_EX mol/mol 0 0 0.0275836 0.00122752 0.0374855 0.00236278 yield of living reserve on food
Y_EX_d mol/mol 0.0010645 0.0044733 8.19616e-06 0.00666869 5.46022e-06 0.00897959 yield of dead reserve on food
Y_CX mol/mol 0.873687 0.834858 0.603502 0.808456 0.554206 0.788846 yield of CO2 on food
Y_HX mol/mol 0.630997 0.602953 0.435862 0.583885 0.40026 0.569722 yield of H2O on food
Y_OX mol/mol -0.950135 -0.907908 -0.656308 -0.879196 -0.602699 -0.85787 yield of O2 on food
Y_NX mol/mol 0.131053 0.125229 0.0905252 0.121268 0.0831308 0.118327 yield of N-waste on food
mu_TX J/mol 463978 444393 327559 431021 302416 421043 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