Predictions & Data for this entry

Model: abj climate: MC migrate:
COMPLETE = 2.2 ecozone: MANE food: biB, jiAa
MRE = 0.023 habitat: 0iMb, 0iMi gender: Hh
SMSE = 0.022 embryo: Ms reprod: O

Zero-variate data
ab 4 4.041 (0.01031)dage at birthDoug1983b
tp110 107.6 (0.02224)dtime since birth at pubertyguess
am365 365 (7.956e-06)dlife spanguess
Lb0.028 0.02681 (0.04256)cmbody length at birthDoug1983
Lp0.9 0.8963 (0.004105)cmbody length at pubertyguess
Li1.5 1.509 (0.005675)cmultimate body lengthWiki
Wwb4.2e-06 4.011e-06 (0.04494)gwet weight at birthguess
Wwp0.005 0.005024 (0.004898)gwet weight at pubertyguess
Wwi0.0231 0.02395 (0.03695)gultimate wet weightguess
Ri 15 14.41 (0.03915)#/dmax reproduction rateguess
Uni-variate data
DatasetFigure(RE)Independent variableDependent variableReference
tL see Fig. 1 (0.04766)time since birthbody lengthDoug1983
Pseudo-data at Tref
DataGeneralised animalSymsagittifera roscoffensisUnitDescription
v 0.02 0.02307cm/denergy conductance
kap 0.8 0.9-allocation fraction to soma
kap_R 0.95 0.475-reproduction efficiency
p_M 18 99.36J/^3vol-spec som maint
k_J 0.002 0.0021/dmaturity maint rate coefficient
kap_G 0.8 0.8013-growth efficiency


  • Neonates have no symbionts. Juveniles only ingested the geen alga Platymonas convoluta (Volvocaceae) as symbiont; the algae take 2-3 d to increase amd migrate throught the body without thecae and in 15-20 d the animal is uniformly green (ref: Doug1983)
  • Food uptake by phagocytosis (ref: Doug1983)
  • host supplies symbionts with uric acid (ref: Doug1983a)


  • Metabolic acceleration is here linked to establisment of internal algal symbiont population
  • Reproduction efficiency kap_R has been set to 0.95/2 because the species is simultaneous hermaphroditic


  • [Wiki]
  • [Doug1983] A. E. DOUGLAS. Establishment of the symbiosis in Convoluta roscoffensis. J. mar. biol. Ass. U.K., 63:419--434, 1983.
  • [Doug1983b] A. E. DOUGLAS. Experimental studies on egg production by Convoluta roscoffensis: Graff, 1882 (Turbellaria, Acoela). Hydrobiologia, 102:151--154, 1983.
  • [Doug1983a] A. E. DOUGLAS. Uric acid utilization in platymonas convolutae and symbiotic Convoluta roscoffensis. J. mar. biol. Ass. U.K., 63:435--447, 1983.
  • [Kooy2010] S.A.L.M. Kooijman. Dynamic Energy Budget theory for metabolic organisation. Cambridge Univ. Press, Cambridge, 2010.

Bibtex file with references for this entry

Bas Kooijman, 2017/09/24

accepted: 2017/09/24

refer to this entry as: AmP Symsagittifera roscoffensis version 2017/09/24