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Biology & Philosophy

, Volume 25, Issue 4, pp 603–621 | Cite as

Evaluating Maclaurin and Sterelny’s conception of biodiversity in cases of frequent, promiscuous lateral gene transfer

  • Gregory J. Morgan
Article

Abstract

The recent conception of biodiversity proposed by James Maclaurin and Sterelny was developed mostly with macrobiological life in mind. They suggest that we measure biodiversity by dividing life into natural units (typically species) and quantifying the differences among units using phenetic rather than phylogenetic measures of distance. They identify problems in implementing quantitative phylogenetic notions of difference for non-prokaryotic species. I suggest that if we focus on microbiological life forms that engage in frequent, promiscuous lateral gene transfer (LGT), and their associated reticulated phylogenies, we need to rethink the notion of species as the natural unit, and we discover additional problems with phylogenetic notions of distance. These problems suggest that a phenetic approach based on morphospaces has just as much appeal, if not more, for microbes as they do for multi-cellular life. Facts about LGT, however, offer no new insight into the additional challenge of reconciling units and differences into a single measure of biodiversity.

Keywords

Biodiversity Microbial species Modi Ecotype Networks Non-hierarchical classification Lateral gene Transfer Morphospace 

Notes

Acknowledgments

I thank the audience at the Halifax meeting of Perspectives on the Tree of Life, sponsored by the Leverhulme Trust, for feedback and advice. Suggestions from David Silverstein, Donavan Parks, Rob Beiko, Ford Doolittle, Jeffrey Lawrence, Maureen O’Malley and two anonymous reviewers significantly improved the paper. I also thank Jeffrey Lawrence for the unpublished distance data that allowed the network in Fig. 5 to be calculated and Na-Young Kim for creating Figs. 3, 4 and 6.

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Copyright information

© Springer Science+Business Media B.V. 2010

Authors and Affiliations

  1. 1.College of Arts and LettersStevens Institute of TechnologyHobokenUSA

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