Gammarus pulex: Population traits

at T = 13 °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_min f_max date: 2025/05/19
symbol units thinning falsethinning true thinning falsethinning true description
femalemale femalemale femalemale femalemale
f - 0.443982 0.443982 0.848146 0.848146 1 1 1 1 scaled functional response
r 1/d 0 0 0 0 0.0173982 0.0173982 0.000413729 0.000413729 spec pop growth rate
t2 d NaN NaN NaN NaN 39.8401 39.8401 1675.37 1675.37 population doubling time
a_b d 26.3401 26.0325 23.7466 23.4848 23.1569 22.9092 23.1569 22.9092 age at birth
t_j d 450.808 343.253 112.599 102.858 92.2807 85.2754 92.2807 85.2754 time since birth at metam
t_p d 622.46 457.173 139.66 127.214 113.779 104.928 113.779 104.928 time since birth at puberty
S_b - 0.999835 0.999852 0.999879 0.999891 0.999888 0.999899 0.999888 0.999899 survival probability at birth
S_j - 0.998709 0.998865 0.526693 0.494542 0.99931 0.99939 0.455565 0.427187 survival probability at metam
S_p - 0.713223 0.871527 0.0476658 0.0456731 0.995555 0.996557 0.043509 0.0421237 survival probability at puberty
theta_0b - 0.0410129 0.0380852 0.355075 0.37667 0.33228 0.329313 0.412973 0.432063 frac of ind that is embryo
theta_bj - 0.0410383 0.0381092 0.262322 0.270584 0.222137 0.221106 0.283605 0.288604 frac of ind between b and j
theta_jp - 0.591522 0.442074 0.265204 0.240112 0.312699 0.298544 0.211432 0.191296 frac of ind between j and p
theta_pi - 0.326427 0.481731 0.117399 0.112634 0.132884 0.151038 0.0919911 0.0880373 frac of ind that is adult
L_bi cm 0.0699172 0.0842493 0.086502 0.0891363 0.0891098 0.0947804 0.0872254 0.0893293 mean structural length of post-natals
L2_bi cm^2 0.00521082 0.00767601 0.0114342 0.0126835 0.0106355 0.0123083 0.0126029 0.0138118 mean squared structural length of post-natals
L3_bi cm^3 0.000409765 0.000739689 0.00211044 0.00257343 0.001652 0.00209205 0.00272923 0.00327104 mean cubed structural length of post-natals
Ww_bi g 0.000515251 0.000944329 0.00314829 0.00393349 0.00260987 0.00339566 0.00431169 0.00530931 mean wet weight of post-natals
L_pi cm 0.0912947 0.105896 0.209691 0.224238 0.179351 0.187488 0.236507 0.250839 mean structural length of adults
L2_pi cm^2 0.00834928 0.0112508 0.0459873 0.0530389 0.0338847 0.0373155 0.0599371 0.0681711 mean squared structural length of adults
L3_pi cm^3 0.000764856 0.00119899 0.0104379 0.0130537 0.00674356 0.00788001 0.0159887 0.0196337 mean cubed structural length of adults
Ww_pi g 0.000961753 0.0015307 0.0155709 0.0199526 0.0106536 0.0127902 0.0252593 0.031868 mean wet weight of adults
R 1/d 0.0160799 0.0278632 0.265672 0.32807 0.208186 0.241786 0.399931 0.48287 mean reproduction rate of adults
J_X g/d 2.34456e-05 4.23045e-05 0.000138522 0.000169252 0.000153865 0.000197692 0.000186257 0.000223766 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 0.186799 0.184115 0.00606238 0.00604795 yield of living structure on food
Y_VX_d mol/mol 0.0459965 0.0427784 0.0998189 0.0975713 0.00211727 0.00194258 0.10203 0.0994839 yield of dead structure on food
Y_EX mol/mol 0 0 0 0 0.10831 0.114726 0.00351509 0.00376863 yield of living reserve on food
Y_EX_d mol/mol 0.0118408 0.0118349 0.0490882 0.0515665 0.00122764 0.00121047 0.0591591 0.0619909 yield of dead reserve on food
Y_CX mol/mol 0.832788 0.836012 0.741718 0.741487 0.592171 0.588631 0.719858 0.719334 yield of CO2 on food
Y_HX mol/mol 0.600532 0.602857 0.534861 0.534695 0.427021 0.424468 0.519098 0.51872 yield of H2O on food
Y_OX mol/mol -0.905657 -0.909163 -0.806618 -0.806367 -0.643986 -0.640136 -0.782846 -0.782275 yield of O2 on food
Y_NX mol/mol 0.124918 0.125402 0.111258 0.111223 0.0888256 0.0882946 0.107979 0.1079 yield of N-waste on food
mu_TX J/mol 442989 444602 395592 395353 317796 315706 383983 383566 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