DME: Developmental Mass Extrapolation
In MASSTIMATE: Body Mass Estimation Equations for Vertebrates

Description Usage Arguments Details Value Author(s) References See Also Examples

This function estimates the body mass of an immature specimen based on the mass of a presumed adult and a standard measurement (e.g., femur length or circumference), as described by Erickson and Tumanova (2000).

1	DME(juv_proxy, adu_proxy, adu_mass, scale_fac = 3)

`juv_proxy`	numeric value or vector corresponding to the measurement taken on the immature specimen(s) of interest
`adu_proxy`	numeric value corresponding to the measurement taken on the presumed adult representative
`adu_mass`	numeric value corresponding to the body mass of the adult representative
`scale_fac`	numeric value corresponding to the growth allometric scaling factor applied to the immature and adult specimens, defaults to 3 (i.e., isometry)

It cannot be assumed that growth-related allometric scaling coefficients will be consistent with those derived from interspecific relationships of adults (e.g.,QE). DME was developed by Erickson and Tumanova (2000) in order to extrapolate the body mass of an adult to that of an immature specimen through the use of a growth-related scaling factor. Although the assumed scaling factor is that of isometry between a linear and volumetric measurement (scale_fac = 3), if an alternate scaling factor is known, then it can be incorporated by adjusting the scale_fac value.

A numeric value or vector representing the mass estimate(s) in grams of the immature specimen(s).

Nicolas E. Campione

Brassey C. A., Maidment, S. C. R. & Barrett, P. M. (2015). Body mass estimates of an exceptionally complete Stegosaurus (Ornithischia: Thyreophora): comparing volumetric and linear bivariate mass estimation methods. Biology Letters, 11, 20140984.

Erickson G. M. and Tumanova, T. A. (2000). Growth curve of Psittacosaurus mongoliensis Orborn (Ceratopsia; Psittacosauridae) inferred from long bone histology. Zoological Journal of the Linnean Society, 130, 551-566.

QE cQE

##Based on the immature Stegosaurus from Brassey et al. (2015)

## Immature (NHMUK R36730: HC = 282, FC = 339, FL = 863
## Adult (YPM1853): HC = 352, FC = 425, FL = 1348

##DME estimate, adult extracted from dinos dataset
DME(juv_proxy = 863, adu_proxy = 1348, adu_mass = QE(352+425)[2])