Predictions & Data for this entry

Model: abj climate: MB, MC migrate: phylum:
COMPLETE = 2.5 ecozone: MAE, MAm food: bjPz, jiCi, jiCvf class:
MRE = 0.082 habitat: 0jMc, jiMb gender: D order:
SMSE = 0.041 embryo: Mc reprod: Os family:

Zero-variate data

Data Observed Predicted (RE) Unit Description Reference
ab_22 37 7.616 (0.7942) d age at birth CaveDoma1999
ab_18 47 10.9 (0.7682) d age at birth IgleOter2004
ts 40 43.43 (0.08579) d time since birth at settlement IgleOter2004
tp 150 145.5 (0.03022) d time since birth at puberty SilvSobr2002
am 240 255.3 (0.06361) d life span IgleOter2004
Lb 0.15 0.1334 (0.1109) cm mantle length at birth IgleSanc2007
Wdb 0.00034 2.021e-05 (0.9405) g dry weight at birth IgleOter2004, VillRiba2004
Wds 0.0095 0.009402 (0.01037) g dry weight at settlement IgleOter2004
Wwp 1000 968.3 (0.03169) g wet weight at puberty SilvSobr2002
Wwi 1800 1752 (0.02685) g ultimate wet weight IgleOter2004
Ni 1.12e+05 1.111e+05 (0.007634) # cum reprod at death IgleOter2004

Uni- and bivariate data

Data Figure Independent variable Dependent variable (RE) Reference
tWd_para1 Data from IgleOter2004, CarrArro2006 time since birth dry weight (0.3853) IgleOter2004
tWd_para2 Data from IgleOter2004, CarrArro2006 time since birth dry weight (12.69) CarrArro2006
tL_para2 time since birth mantle length (0.4898) CarrArro2006
tW time since birth wet weight (0.188) IgleOter2004

Pseudo-data at Tref = 20°C

Data Generalised animal Octopus vulgaris Unit Description
v 0.02 0.01875 cm/d energy conductance
p_M 18 7.032 J/d.cm^3 vol-spec som maint
k_J 0.002 0.002 1/d maturity maint rate coefficient
k 0.3 1.542 - maintenance ratio
kap 0.8 0.9962 - allocation fraction to soma
kap_G 0.8 0.8104 - growth efficiency
kap_R 0.95 0.95 - reproduction efficiency

Discussion

  • z is not well-fixed by data, size ultimate size is much larger than size at death
  • in view of fitting results, puberty does not coincide with mating and part of structure converts to eggs just before death
  • model abj has been used, meaning that settlement has no effect on acceleration

Facts

  • semelparous: death at first spawning, female ventilates eggs and dies after hatching; No food intake during this period (Ref: Wiki)
  • small eggs with a planktontic larval stage (Ref: Wiki)
  • males and females grow at the same rate; males mature before females (Ref: Wiki)

Bibliography

Citation