Ursus maritimus (Polar bear):  

Predictions & Data for this entry

Model:  stx  

MRE = 0.079
SMSE = 0.083

Zero-variate data
tg230 218.1 (0.05156)dgestation timeAnAge
tx876 865.6 (0.01189)dtime since birth at weaningDeroWiig2002
tp1606 2267 (0.4117)dtime since birth at puberty for femaleDeroWiig2002
tp_m2263 2294 (0.01389)dtime since birth at puberty for maleDeroWiig2002
am1.57e+04 1.629e+04 (0.038)dlife spanAnAge
Li194 191.3 (0.01375)cmultimate head-body length for femaleDeroWiig2002
Li_m225 227.7 (0.01197)cmultimate head-body length for maleDeroWiig2002
Wwb665 679.6 (0.0219)gwet weight at birthAnAge
Wwx1.02e+05 1.027e+05 (0.006823)gwet weight at weaningDeroWiig2002
Wwp1.54e+05 1.659e+05 (0.07704)gwet weight at puberty for femalesDeroWiig2002
Wwp_m2.85e+05 3.111e+05 (0.09162)gwet weight at puberty for malesDerWiig2002
Wwi1.85e+05 1.711e+05 (0.07529)gultimate wet weight for femaleDeroWiig2002
Wwi_m3.89e+05 3.265e+05 (0.1608)gultimate wet weight for maleDeroWiig2002
Ri0.002667 0.002885 (0.08182)#/dmaximum reprod rateAnAge
Uni-variate data
DatasetFigure(RE)Independent variableDependent variableReference
tW_f see Fig. 1 (0.1131)time since birthwet weightDeroWiig2002
tW_m see Fig. 1 (0.1592)time since birthwet weightDeroWiig2002
tL_f see Fig. 2 (0.03884)time since birthlengthDeroWiig2002
tL_m see Fig. 2 (0.04786)time since birthlengthDeroWiig2002
Pseudo-data at Tref
DataGeneralised animalUrsus maritimusUnitDescription
v 0.02 0.076cm/denergy conductance
kap 0.8 0.93-allocation fraction to soma
kap_R 0.95 0.95-reproduction efficiency
p_M 18 30J/d.cm^3vol-spec som maint
k_J 0.002 0.0021/dmaturity maint rate coefficient
kap_G 0.8 0.7995-growth efficiency
t_0 0 165dtime at start development


  • Size and weight differ between populations (ref: DeroWiig2002)
  • Gestation includes delayed implantation of about 165 days (ref: AnAge)


  • Males are assumed to differ from females by {p_Am} only


  • [AnAge] http://genomics.senescence.info/species/entry.php?species=Ursus_maritimus.
  • [DeroWiig2002] A.E. Derocher and O. Wiig. Postnatal growth n body length and mass of polar bears (Ursus maritimus) at Svalbard. Journal of Zoology, 256:343--349, 2002.
  • [Kooy2010] S.A.L.M. Kooijman. Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge, 2010.

Bibtex files with references for this entry

Jean-Pierre Desforges, 2016/11/05 (last modified by Jean-Pierre Desforges 2017/05/30)

accepted: 2017/06/22

refer to this entry as: AmP Ursus maritimus version 2017/06/22 bio.vu.nl/thb/deb/deblab/add_my_pet/