Scientists strive to develop clear rules for naming and grouping living organisms. But taxonomy, the scientific study of biological classification and evolution, is often highly debated. Members of a species, the fundamental unit of taxonomy and evolution, share a common evolutionary history and a common evolutionary path to the future. Yet, it can be difficult to determine whether the evolutionary history or future of a population is sufficiently distinct to designate it as a unique species.
A species is not a fixed entity – the relationship among the members of the same species is only a snapshot of a moment in time. Different populations of the same species can be in different stages in the process of species formation or dissolution. In some cases hybridization and introgression can create enormous challenges in interpreting data on genetic distinctions between groups. Hybridization is far more common in the evolutionary history of many species than previously recognized. As a result, the precise taxonomic status of an organism may be highly debated. This is the current case with the Mexican gray wolf (Canis lupus baileyi) and the red wolf (Canis rufus), and this report assesses the taxonomic status for each.
Table of Contents
|2 Guiding Principles for Identifying Species and Subspecies||17-28|
|3 Using Genes and Genomes to Identify Species and Subspecies||29-40|
|4 Is the Mexican Gray Wolf a Valid Subspecies?||41-50|
|5 Is the Red Wolf a Valid Taxonomic Species?||51-72|
|Appendix A: Open Session Meeting Agendas||79-82|
|Appendix B: List of Webinars and Solicited Expert Input||83-84|
|Appendix C: Biographical Sketches of Committee Members and Staff||85-90|
Criteria to make evidence-based distinctions between species and one or more associated subspecies.Susan M. Haig, Forest and Rangeland Ecosystem Science Center, U.S. Geological Survey
The Role of Hybridization in the Species EvolutionMichael L. Arnold, University of GeorgiaHuman and Landscape Influences on Species HybridizationEmily K. Latch, University of Wisconsin-Milwaukee
Speakers:Joseph Hinton, University of GeorgiaRoland Kays, North Carolina State University
Speaker: Ronald M. Nowak, Zoologist (retired)
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