ms2pfmg: Convert moult scores to proportion of feather mass grown

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

View source: R/ms2pfmg.R

Description

Convert moult scores obtained for single feathers into overall proportion of feather mass grown.

Usage

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ms2pfmg(ms, fm)

Arguments

ms

vector of moult scores. Ideally, each moult score is a character string of one individual's individual feather moult scores, each between 0 and 5, e.g. "555444000" if only nine primaries are of interest.

fm

vector of relative feather mass, corresponding to each feather in ms.

Details

ms will usually be a vector of 9 or 10 primary feather scores, but single feathers can be given, in which case fm is ignored. The method used here assumes that a moult score of 1 for any feather corresponds to 1/8th of the feather grown, 2 corresponds to 3/8th = 0.375, etc.. The proportion of feather mass grown is then a weighted sum over all feathers, with weights equal to the relative weight (compared to the total weight) of each feather (Underhill and Zucchini 1988).

Value

ms2pfmg returns a single value between 0 and 1: proportion of total feather mass grown.

Author(s)

Bo T. Bonnevie

References

Underhill, L. G. and Zucchini, W. (1988) A model for avian primary moult. Ibis 130, 358–372.

See Also

predict.moult, moult

Examples

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## relative primary feather mass of the 10 primary feathers 
## (as proportion of total feather mass) for Sanderlings
fm.sand <- c(0.0385, 0.0458, 0.0544, 0.0680, 0.0827, 0.1019,
             0.1199, 0.1417, 0.1604, 0.1867)   

ms2pfmg(3, 0.2)              # single feather
ms2pfmg(3, 1)
ms2pfmg("5555500000", fm.sand)

moult documentation built on Jan. 12, 2018, 5:03 p.m.