The use of Gompertz models in growth analyses, and new Gompertz-model approach: An addition to the Unified-Richards family
Top Cited Papers
Open Access
- 5 June 2017
- journal article
- review article
- Published by Public Library of Science (PLoS) in PLOS ONE
- Vol. 12 (6), e0178691
- https://doi.org/10.1371/journal.pone.0178691
Abstract
The Gompertz model is well known and widely used in many aspects of biology. It has been frequently used to describe the growth of animals and plants, as well as the number or volume of bacteria and cancer cells. Numerous parametrisations and re-parametrisations of varying usefulness are found in the literature, whereof the Gompertz-Laird is one of the more commonly used. Here, we review, present, and discuss the many re-parametrisations and some parameterisations of the Gompertz model, which we divide into Ti (type I)- and W0 (type II)-forms. In the W0-form a starting-point parameter, meaning birth or hatching value (W0), replaces the inflection-time parameter (Ti). We also propose new “unified” versions (U-versions) of both the traditional Ti -form and a simplified W0-form. In these, the growth-rate constant represents the relative growth rate instead of merely an unspecified growth coefficient. We also present U-versions where the growth-rate parameters return absolute growth rate (instead of relative). The new U-Gompertz models are special cases of the Unified-Richards (U-Richards) model and thus belong to the Richards family of U-models. As U-models, they have a set of parameters, which are comparable across models in the family, without conversion equations. The improvements are simple, and may seem trivial, but are of great importance to those who study organismal growth, as the two new U-Gompertz forms give easy and fast access to all shape parameters needed for describing most types of growth following the shape of the Gompertz model.Keywords
This publication has 63 references indexed in Scilit:
- A unified approach to the Richards-model family for use in growth analyses: Why we need only two model formsJournal of Theoretical Biology, 2010
- Growth rates of cobia (Rachycentron canadum) cultured in open ocean submerged cages in the CaribbeanAquaculture, 2010
- Relative growth rates of predator and prey dinosaurs reflect effects of predationProceedings. Biological sciences, 2008
- Temperature- and size-dependent growth of larval and early juvenile Atlantic cod (Gadus morhua): a comparative study of Norwegian coastal cod and northeast Arctic codCanadian Journal of Fisheries and Aquatic Sciences, 1999
- Differential growth of larval sprat Sprattus sprattus across a tidal front in the eastern North SeaMarine Ecology Progress Series, 1993
- The effect of sodium chloride and temperature on the rate and extent of growth of Clostridium botulinum type A in pasteurized pork slurryJournal of Applied Bacteriology, 1987
- Experimental systems and a mathematical model for studying temperature effects on pollen-tube growth and fertilization in plumPlant, Cell & Environment, 1982
- Growth and energy consumption by captive mallardsCanadian Journal of Zoology, 1981
- Fitting the Exponential Function and the Gompertz Function by the Method of Least SquaresJournal of the American Statistical Association, 1941