R code for Nunes et al, 2015 in Phil. Trans R. Soc - https://royalsocietypublishing.org/doi/10.1098/rstb.2014.0004 This code uses a novel metric for measuring phylogenetic contribution of a species when downlisted (ADEPD).
Nunes LA, Turvey ST, Rosindell J. 2015 The price of conserving avian phylogenetic diversity: a global prioritization approach. Phil. Trans. R. Soc. B 370: 20140004. http://dx.doi.org/10.1098/rstb.2014.0004