Squalus acanthias: Population traits

at T = 9 °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: 2025/05/22
symbol units thinning falsethinning true thinning falsethinning true description
femalemale femalemale femalemale femalemale
f - 0.339504 0.339504 0.366988 0.366988 1 1 1 1 scaled functional response
r 1/d 0 0 0 0 0.000637725 0.000637725 0.000136801 0.000136801 spec pop growth rate
t2 d NaN NaN NaN NaN 1086.91 1086.91 5066.84 5066.84 population doubling time
a_b d 693.74 713.52 686.997 705.931 625.116 634.669 625.116 634.669 age at birth
t_p d 11677.3 NaN 6991.59 NaN 2092.92 2361.78 2092.92 2361.78 time since birth at puberty
S_b - 0.999994 0.999992 0.999994 0.999992 0.999995 0.999994 0.999995 0.999994 survival probability at birth
S_p - 0.999958 0.99994 0.522204 0.583952 0.999976 0.999968 0.350865 0.374406 survival probability at puberty
theta_0b - 0.0211676 0.0236685 0.118734 0.0958582 0.328804 0.332897 0.447862 0.423547 frac of ind that is embryo
theta_bp - 0.0211748 0.0236781 0.0847452 0.0724006 0.220725 0.222117 0.243048 0.236788 fraction of individuals that is juvenile
theta_pi - 0.957658 0.952653 0.79652 0.831741 0.450471 0.444986 0.30909 0.339665 frac of ind that is adult
L_bi cm 4.43375 3.62462 4.40422 3.70923 4.42739 4.1158 4.5677 4.41454 mean structural length of post-natals
L2_bi cm^2 19.959 13.2816 20.4019 14.1847 23.9551 20.1326 29.5815 26.0692 mean squared structural length of post-natals
L3_bi cm^3 90.701 49.029 97.329 55.3228 153.524 114.148 250.673 191.815 mean cubed structural length of post-natals
Ww_bi g 225.483 108.066 253.668 127.331 825.492 518.999 1347.86 872.129 mean wet weight of post-natals
L_pi cm 4.48485 3.66396 4.64783 3.8539 5.40983 4.98675 6.31445 5.88335 mean structural length of adults
L2_pi cm^2 20.2999 13.5076 22.0926 15.0523 32.7536 27.3208 48.4136 40.4552 mean squared structural length of adults
L3_pi cm^3 92.4903 50.0329 106.652 59.378 221.316 164.078 436.912 316.437 mean cubed structural length of adults
Ww_pi g 229.931 110.279 277.965 136.665 1190.01 746.02 2349.26 1438.75 mean wet weight of adults
R 1/d 0 0 0.000230404 0 0.00204128 0.00139653 0.00452594 0.00340778 mean reproduction rate of adults
J_X g/d 0.371807 0.200486 0.410826 0.231451 1.31441 0.895137 1.62314 1.15909 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 0.0744863 0.0813226 0.0211271 0.0226388 yield of living structure on food
Y_VX_d mol/mol 0.00859175 0.00924441 0.0177999 0.0180326 6.31491e-05 8.51583e-05 0.0351167 0.0366188 yield of dead structure on food
Y_EX mol/mol 0 0 0 0 0.326024 0.288429 0.0924727 0.0802935 yield of living reserve on food
Y_EX_d mol/mol 0.0127673 0.0111314 0.028592 0.0234713 0.000276402 0.000302033 0.153705 0.129877 yield of dead reserve on food
Y_CX mol/mol 0.804071 0.80498 0.780916 0.785437 0.453042 0.48145 0.544088 0.574607 yield of CO2 on food
Y_HX mol/mol 0.690583 0.691365 0.670696 0.67458 0.389099 0.413497 0.467295 0.493507 yield of H2O on food
Y_OX mol/mol -0.945327 -0.946396 -0.918104 -0.923419 -0.53263 -0.566029 -0.639671 -0.675552 yield of O2 on food
Y_NX mol/mol 0.0651949 0.0652687 0.0633175 0.0636841 0.0367331 0.0390365 0.0441153 0.0465898 yield of N-waste on food
mu_TX J/mol 453228 453793 440150 442805 251278 268232 303598 321594 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