Convert moult scores to proportion of feather mass grown
Convert moult scores obtained for single feathers into overall proportion of feather mass grown.
ms2pfmg(ms, fm)
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. |
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).
ms2pfmg returns a single value between 0 and 1: proportion of
total feather mass grown.
Bo T. Bonnevie
Underhill, L. G. and Zucchini, W. (1988) A model for avian primary moult. Ibis 130, 358–372.
## 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)Please choose more modern alternatives, such as Google Chrome or Mozilla Firefox.