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5 - Integrating phylogenetic diversity in the selection of priority areas for conservation: does it make a difference?

Published online by Cambridge University Press:  04 December 2009

By
Ana S. L. Rodrigues ,
Thomas M. Brooks  and
Kevin J. Gaston
Edited by
Andrew Purvis ,
John L. Gittleman  and
Thomas Brooks
Ana S. L. Rodrigues
Affiliation:
Conservation Synthesis Department, Center for Applied Biodiversity Science, Conservation International, 1919 M St, NW Suite 600, Washington, DC 20036, USA
Thomas M. Brooks
Affiliation:
Conservation Synthesis Department, Center for Applied Biodiversity Science, Conservation International, 1919 M St, NW Suite 600, Washington, DC 20036, USA
Kevin J. Gaston
Affiliation:
Biodiversity and Macroecology Group, Department of Animal and Plant Sciences, University of Sheffield, Sheffield S10 2TN, UK
Andrew Purvis
Affiliation:
Imperial College of Science, Technology and Medicine, London
John L. Gittleman
Affiliation:
University of Virginia
Thomas Brooks
Affiliation:
Conservation International, Washington DC
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Summary

INTRODUCTION

Species are the most frequently used currency of biological diversity (see, for example, Gaston 1996). However, they are not equivalent in terms of the amount of unique evolutionary history they represent, and that would be irreversibly lost if they became extinct (May 1990; Vane-Wright et al. 1991). Classical examples of species that embody disproportionate amounts of evolutionary history are the tuataras (Sphenodon punctatus and S. guntheri), iguana-like reptiles that are the sole survivors of the order Sphenodontia, and the welwitschia (Welwitschia mirabilis), a gymnosperm that is the single representative of the order Welwitschiales (Daugherty et al. 1990; von Willert 1994).

Phylogenetic diversity (PD) is a biodiversity measure that takes account of phylogenetic relationships (and hence evolutionary history) between taxa (Faith 1992, 1994a; Polasky et al. 2001; Rodrigues & Gaston 2002a). The phylogenetic diversity contained in the species that exist today is part of the raw material on which future evolutionary processes will operate. Keeping these pieces is fundamental to leaving the options open for future evolution (Moritz 2002). However, previous studies indicate that PD is being lost at a faster rate than expected from species loss (Purvis et al. 2000; von Euler 2001), and that PD is not evenly distributed throughout the planet (Sechrest et al. 2002), suggesting that conservation action may need to target evolutionary history directly.

For a given clade, the extent to which phylogenetic diversity is more or less evenly spread across species is determined by the structure of the phylogenetic tree.

Type
Chapter
Information
Phylogeny and Conservation , pp. 101 - 119
Publisher: Cambridge University Press
Print publication year: 2005

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