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March 2008 EXTINCTION-PRONE TRAITS OF DESERT FISHES
<br />biological characteristics. Failing to do so may provide
<br />only a limited perspective for identifying extinction-
<br />prone traits and may, in some cases, mask higher-order
<br />synergisms among suites of traits, as suggested by
<br />Davies et al. (2004). Moreover, there are likely multiple
<br />means to an "extinction end" in the sense that species
<br />with different trait combinations may be predisposed to
<br />similar levels of risk to rarity, extirpation, and extinc-
<br />tion. We cite the need for more research involving other
<br />taxa and ecosystems that examines the manner in which
<br />trait synergisms influence patterns and rates of popula-
<br />tion decline, local extirpation, and global extinction.
<br />ACKNOWLEDGMENTS
<br />We thank Paul Angermeier, Michael Douglas, Kurt Fausch,
<br />and two anonymous reviewers for their comments, and Bill
<br />Fagan and colleagues for their published findings. We offer our
<br />sincere appreciation to the following survey participants for
<br />completing the questionnaire and for their dedicated conserva-
<br />tion efforts in the Colorado River Basin: J. Brooks, T. Chart,
<br />K. Christopherson, R. Clarkson, J. Deacon, J. Hawkins, P.
<br />Holden, M. Hudson, P. Marsh, P. Martinez, C. McAda, G.
<br />Mueller, T. Nesler, D. Propst, J. Rinne, J. Sjoberg, M.
<br />Trammell, H. Tyus, P. Unmack, and R. Valdez. Funding for
<br />this research was provided by the USGS Lower Colorado River
<br />Basin Aquatic GAP Program to J. D. Olden, a U.S. EPA STAR
<br />Grant ##R828636 to N. L. Poff, and the Upper Colorado River
<br />Recovery Program for Endangered Fishes to K. R. Bestgen.
<br />J. D. Olden conceived and developed the idea for the
<br />manuscript, J. D. Olden and K. R. Bestgen assembled the trait
<br />database, J. D. Olden conducted the data analysis, and J. D.
<br />Olden, N. L. Poff, and K. R. Bestgen wrote the manuscript.
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