Predictions & Data for this entry

Model: stf climate: Cfb, Dfb migrate: phylum:
COMPLETE = 2.5 ecozone: TH food: biP, biAa class:
MRE = 0.079 habitat: 0iFp, biFl gender: Hh order:
SMSE = 0.085 embryo: Fc reprod: Ob family:

Zero-variate data
ab1.5 1.551 (0.0338)dage at birthMassRoch2008
tp 7 6.9 (0.01425)dtime since birth at pubertyMassRoch2008
am2e+05 2e+05 (1.556e-06)dlife spanguess
Vb0.02 0.0182 (0.09018)mm^3volume at birthMassRoch2008
Vp0.14 0.1417 (0.0119)mm^3volume at pubertyMassRoch2008
Vi1.12 1.171 (0.0452)mm^3ultimate volumeMassRoch2008
Ri3.333 3.018 (0.09464)#/dmaximum reprod rateKali2011
Uni-variate data
DatasetFigure(RE)Independent variableDependent variableReference
tVs see Fig. 1 (0.09541)time since birthvolumeMassRoch2008
tAs see Fig. 2 (0.07364)time since birthsurface areaMassRoch2008
tN see Fig. 3 (2000)timenumber of individualsMassRoch2008
AN see Fig. 4 (0.3262)surface areanumber of budsKali2011
Pseudo-data at Tref
DataGeneralised animalHydra viridissimaUnitDescription
v 0.02 0.03614cm/denergy conductance
kap 0.8 0.3502-allocation fraction to soma
kap_R 0.95 0.475-reproduction efficiency
p_M 18 139.5J/^3vol-spec som maint
k_J 0.002 0.0021/dmaturity maint rate coefficient
kap_G 0.8 0.8006-growth efficiency


  • Medusa stage is absent in Hydra; this species is symbiontic with algae (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
  • Reproduction efficiency kap_R has been set to 0.95/2 because the species is simultaneous hermaphroditic


  • [Wiki]
  • [Kali2011] A. Kaliszewicz. Interference of asexual and sexual reproduction in the green hydra. Ecol Res, 26:147--152, 2011.
  • [Kooy2010] S.A.L.M. Kooijman. Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge, 2010.
  • [MassRoch2008] F. C. Massaro and O. Rocha. Development and population growth of Hydra viridissima pallas, 1766 (Cnidaria, Hydrozoa) in the laboratory. Braz. J. Biol., 68(2):379--383, 2008.

Bibtex file with references for this entry

Bas Kooijman, 2012/10/15 (last modified by Bas Kooijman 2018/01/06)

accepted: 2018/01/06

refer to this entry as: AmP Hydra viridissima version 2018/01/06