Subtree Length
Birds at risk, Phylogeny (subtree length)
Counts the numbers of cladogram nodes between the taxa recorded per grid cell. This technique is based on the idea that conservation of genetic diversity (in the sense of expressible genes) provides the greatest options for persistence of endangered taxa. The measure of relative character richness requires 1) a classification of the organisms that can be interpreted as a phylogenetic tree, 2) a model of character evolution to predict the distribution of the valued character or expressible gene changes on that tree from the phylogeny, and 3) an appropriate measure of the length of the subtree that spans a set of species, to be measured relative to the units of the predicted, valued character changes (Williams et al. 1995, Humphries et al. 1995, Gaston 1996).
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