mypd provides the evolutionary time encompassed by your eBird checklist
based on Jetz et al. (2014).
mypd(mydata, ntrees = 20)
Data frame created with
Integer indicating the number of phylogenetic trees to use for calculating PD. Value must be between 1 and 20. Defaults to 20. Lower this number if computation of PD is taking too long.
Phylogenetic distance (PD) is simply the sum of all branch lengths of a tree,
and represents the total evolutionary time covered by the species in the tree.
Values returned by
mypd are in million years of evolution, and are based
in a subset of 20 trees from Jetz et al. (2014) using the full taxonomy and
Hackett "structure". See
raw-data/load-bird-trees.R for more info on
how the trees were extracted from the original source.#'
A tibble containing the mean ("mean_pd"), median ("median_pd"), and standard deviation ("sd_pd") vaules; units are in million years.
Sebastian Pardo [email protected]
Jetz, W., Thomas, G. H., Joy, J. B., Redding, D. W., Hartmann, K. & Mooers, A. O. (2014) Global Distribution and Conservation of Evolutionary Distinctness in Birds. Current Biology 24, 919–930. http://www.cell.com/current-biology/fulltext/S0960-9822(14)00270-X
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