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The promise of a DNA taxonomy
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Journal Article
The promise of a DNA taxonomy
2004
Overview
Not only is the number of described species a very small proportion of the estimated extant number of taxa, but it also appears that all concepts of the extent and boundaries of 'species' fail in many cases. Using conserved molecular sequences it is possible to define and diagnose molecular operational taxonomic units (MOTU) that have a similar extent to traditional 'species'. Use of a MOTU system not only allows the rapid and effective identification of most taxa, including those not encountered before, but also allows investigation of the evolution of patterns of diversity. A MOTU approach is not without problems, particularly in the area of deciding what level of molecular difference defines a biologically relevant taxon, but has many benefits. Molecular data are extremely well suited to re-analysis and meta-analysis, and data from multiple independent studies can be readily collated and investigated by using new parameters and assumptions. Previous molecular taxonomic efforts have focused narrowly. Advances in high-throughput sequencing methodologies, however, place the idea of a universal, multi-locus molecular barcoding system in the realm of the possible.
Publisher
The Royal Society
Subject
