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The Role of Barcoding in Systematics: Discovering and Classifying Taxa

This article explores the integration of DNA barcoding into the practice of systematics, focusing on how barcoding aids in the discovery and delimitation of taxa. It discusses the utility of DNA sequences for phylogenetic classification and the importance of providing identification guides. The paper reviews the limitations and concerns of barcoding, including its inability to distinguish all species and the philosophical implications of its application. It also addresses funding challenges and the debate over resource allocation in systematic research.

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The Role of Barcoding in Systematics: Discovering and Classifying Taxa

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  1. Barcoding and the practice of systematics Richard Lane

  2. Systematics Discover and delimit taxa Classify taxa based on testable relationships (phylogenetic) Provide guides to identification DNA barcoding Diagnostic Discover ‘new’ taxa Sequence data for systematic research What are systematics and barcoding trying to do?

  3. Systematics Discover and delimit taxa Classify taxa based on testable relationships (phylogenetic) Provide guides to identification DNA barcoding Diagnostic Discover taxa Sequence data for systematic research Relative importance of components

  4. Concerns over DNA barcoding Barcoding : • Will not distinguish all species (will not work) • Diverts funds or attention • Philosophically unsound (=pheneticism)

  5. Will not distinguish all species Testable with empirical data: • Plants not distinguishable by single CO1 seq • Where many taxa sampled, >> 95% discriminated • ‘new’ taxa indicated • Species complexes not always discriminated

  6. Diverts funds or attention [from more important elements of systematics] Funding: assumption of finite resources, competition analysable – qualitative methodology Relative importance: value-based

  7. Philosophically unsound (=pheneticism) Only relevant if barcodes used for classification, not if used for identification

  8. Questions?

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