Gammarus fossarum: 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 - 0.637131 0.637131 0.950065 0.950065 1 1 1 1 scaled functional response
r 1/d 0 0 0 0 0.0151369 0.0151369 0.000115028 0.000115028 spec pop growth rate
t2 d NaN NaN NaN NaN 45.792 45.792 6025.92 6025.92 population doubling time
a_b d 30.171 29.9009 28.4329 28.1967 28.2271 27.9956 28.2271 27.9956 age at birth
t_j d 1094.57 701.833 238.821 214.332 217.236 196.704 217.236 196.704 time since birth at metam
t_p d 1094.87 702.01 238.87 214.375 217.28 196.743 217.28 196.743 time since birth at puberty
S_b - 0.999872 0.999883 0.999895 0.999903 0.999897 0.999905 0.999897 0.999905 survival probability at birth
S_j - 0.998824 0.998956 0.569095 0.531215 0.99924 0.99932 0.535969 0.500394 survival probability at metam
S_p - 0.108197 0.597116 0.00864896 0.00807814 0.983086 0.987808 0.00813946 0.00765668 survival probability at puberty
theta_0b - 0.0445669 0.0367543 0.353764 0.38027 0.348516 0.346114 0.379112 0.403693 frac of ind that is embryo
theta_bj - 0.0445829 0.0367679 0.270595 0.281972 0.227365 0.226592 0.281372 0.290588 frac of ind between b and j
theta_jp - 0.880285 0.691469 0.351121 0.314177 0.400483 0.394705 0.317393 0.284508 frac of ind between j and p
theta_pi - 0.0305656 0.235009 0.0245206 0.0235809 0.0236362 0.0325888 0.0221227 0.0212108 frac of ind that is adult
L_bi cm 0.0548183 0.0829367 0.057726 0.0586692 0.0634014 0.0686435 0.0579205 0.0587749 mean structural length of post-natals
L2_bi cm^2 0.00337226 0.00825804 0.0050619 0.00546619 0.00561948 0.00692413 0.0052234 0.00561537 mean squared structural length of post-natals
L3_bi cm^3 0.000234937 0.000932358 0.000756373 0.000906769 0.000735544 0.00104657 0.00083381 0.000991099 mean cubed structural length of post-natals
Ww_bi g 0.000356955 0.00144596 0.00134215 0.00165161 0.00133513 0.00195143 0.0015135 0.001848 mean wet weight of post-natals
L_pi cm 0.113662 0.136695 0.242721 0.260981 0.220344 0.232313 0.257491 0.275772 mean structural length of adults
L2_pi cm^2 0.0129252 0.0187064 0.0596952 0.0692516 0.0494701 0.0552229 0.0674096 0.0776254 mean squared structural length of adults
L3_pi cm^3 0.00147048 0.00256267 0.0148434 0.0186253 0.0113125 0.0134238 0.0178883 0.0222109 mean cubed structural length of adults
Ww_pi g 0.00223419 0.00397435 0.0263388 0.0339246 0.020534 0.0250299 0.03247 0.0414143 mean wet weight of adults
R 1/d 0.0865553 0.166992 1.01176 1.25459 0.835676 0.986329 1.20936 1.4813 mean reproduction rate of adults
J_X g/d 2.32779e-05 9.196e-05 8.40887e-05 0.000101283 9.75317e-05 0.000140478 9.38722e-05 0.000112064 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 0.114156 0.112771 0.00102172 0.00101731 yield of living structure on food
Y_VX_d mol/mol 0.0298352 0.0255172 0.0711499 0.0706711 0.0015946 0.00148528 0.0728396 0.0720835 yield of dead structure on food
Y_EX mol/mol 0 0 0 0 0.0930549 0.0975011 0.000832862 0.000879562 yield of living reserve on food
Y_EX_d mol/mol 0.0154952 0.0140564 0.0551021 0.0580508 0.00129985 0.00128417 0.0593756 0.0623231 yield of dead reserve on food
Y_CX mol/mol 0.845295 0.851051 0.764373 0.761903 0.68052 0.677584 0.756555 0.754322 yield of CO2 on food
Y_HX mol/mol 0.609551 0.613703 0.551198 0.549417 0.49073 0.488613 0.54556 0.54395 yield of H2O on food
Y_OX mol/mol -0.919258 -0.925518 -0.831256 -0.82857 -0.740065 -0.736872 -0.822754 -0.820325 yield of O2 on food
Y_NX mol/mol 0.126794 0.127658 0.114656 0.114285 0.102078 0.101638 0.113483 0.113148 yield of N-waste on food
mu_TX J/mol 449060 452010 406619 405237 362730 361040 402455 401188 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