Phylogenetic diversity

, and the minimum spanning path is the mimimum distance between the two nodes.This definition is distinct from earlier measures which attempted to incorporate phylogenetic diversity into conservation planning, such as the measure of 'taxic diversity' introduced by Vane-Wright, Humphries, and William [Vane-Wright, R. I., Humphries, C. J. & Williams, P. H. 1991. (1991). What to protect - systematics and the agony of choice. Biological Conservation, 55, 235-54. ]

The concept of phylogenetic diversity has been rapidly adopted in conservation planning, with programs such as the Zoological Society of London's EDGE of Existence programme focused on evolutionary distinct species. Similarly, the WWF's Global 200 also includes unusual evolutionary phenomena in their criteria for selecting target ecoregions.

Some studies have indicated that alpha diversity is a good proxy for phylogenetic diversity, so suggesting that term has little use [Rodrigues, A. S. L. & Gaston, K. J. 2002. Maximising phylogenetic diversity in the selection of networks of conservation areas. Biol. Conserv. 105, 103–111|] , but a study in the Cape floristic region showed that using phylogenetic diversity led to selection of different conservation priorities than using species richness. They also demonstrated that PD led to greater preservation of 'feature diversity', than species richness alone [Forest, F. et al. 2007. Preserving the evolutionary potential of floras in biodiversity hotspots. Nature 445, 757-760 http://www.nature.com/nature/journal/v445/n7129/full/nature05587.html] .

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