Hydra viridissima (Green hydra):  

Predictions & Data for this entry

Model:  stf  

MRE = 0.069
SMSE = 0.083

Zero-variate data
ab1.5 1.53 (0.01989)dage at birthMassRoch2008
tp 7 7.11 (0.01579)dtime since birth at pubertyMassRoch2008
am2e+05 2e+05 (9.686e-05)dlife spanguessed
Vb0.02 0.01946 (0.02695)mm^3volume at birthMassRoch2008
Vp0.14 0.1382 (0.01274)mm^3volume at pubertyMassRoch2008
Vi1.12 1.184 (0.05709)mm^3ultimate volumeMassRoch2008
Ri3.333 3.035 (0.08955)#/dmaximum reprod rateKali2011
Uni-variate data
DatasetFigure(RE)Independent variableDependent variableReference
tVs see Fig. 1 (0.08531)time since birthvolumeMassRoch2008
tAs see Fig. 2 (0.07663)time since birthsurface areaMassRoch2008
tN see Fig. 3 (1818)timenumber of individualsMassRoch2008
AN see Fig. 4 (0.3086)surface areanumber of budsKali2011
Pseudo-data at Tref
DataGeneralised animalHydra viridissimaUnitDescription
v 0.02 0.0428cm/denergy conductance
kap 0.8 0.6106-allocation fraction to soma
kap_R 0.95 0.95-reproduction efficiency
p_M 18 61.08J/d.cm^3vol-spec som maint
k_J 0.002 0.0021/dmaturity maint rate coefficient
kap_G 0.8 0.8016-growth efficiency


  • Medusa stage is absent in Hydra (ref: Wiki)


  • Aging at individual level hardly occurs, since cell differentiation is reversible
  • A new bud is formed as soon as the earlier one steps off
  • Bud is treated similar to foetus


  • Wiki
  • Kooy2010
  • MassRoch2008
  • Kali2011

Bibtex files with references for this entry

Bas Kooijman, 2012/10/15 (last modified by Bas Kooijman 2016/10/26)

accepted: 2015/11/06

refer to this entry as: AmP Hydra viridissima version 2015/11/06 bio.vu.nl/thb/deb/deblab/add_my_pet/