Table 3.

Evolutionary history indices used in the study.a

Index		Description	Formula	Author
Phylogenetic Diversity Loss	PDloss	Loss of PD when a set of species {x} is driven extinct	$\text{PDloss (tree},\{x\})={\mathrm{\Sigma }}_{j\in \mathrm{tree}}{L}_j-{\mathrm{\Sigma }}_{j\in \mathrm{tree}}-\{x]L_j$	Faith (1992)
Expected Phylogenetic Diversity Loss	ExpPDloss	Expected loss of phylogenetic diversity	$\text{ExpPDloss (tree, proba)}={\mathrm{\Sigma }}_j{L}_j-{\mathrm{\Sigma }}_j{L}_j(1-{\prod }_{dj}{p}_{dj})$	Faith (2008)
Evolutionary Distinctiveness and Global Endangerment	EDGE	Combination of species evolutionary distinctiveness and extinction risk	${\text{EDGE}}_i=\text{ln}(1+{\mathrm{\Sigma }}_{j\in P(i,\mathrm{Root})}{L}_j/n_j)+\text{ln}(2)\ast {\text{GE}}_i$	Isaac et al. (2007)
Heightened Evolutionary Distinctiveness and Global Endangerment	HEDGE (version relevant to species extinctions)	Contribution of a given species to expected loss of phylogenetic diversity	${\text{HEDGE}}_i={\sum }_{j\in P(i,\mathrm{Root})}{L}_j{\prod }_{s\in C(j)}{p}_s$	Steel et al. (2007)

^a L _j is the length of a branch j on tree, a phylogenetic tree; p _dj is the probability of extinction of the dth descendant of branch j within a defined period of time; proba is the vector of species' probabilities of extinction; P(i, Root) is the set of branches on the shortest path from species i to the root of the tree; n _j is the number of species descending from branch j; GE _i is a value of global endangerment for species i ranging from 0 (least concerned species) to 4 (critically endangered species); p _s accounts for the probability of extinction of species s; C(j) denotes the set of species (including species i) that descend from a branch j.