Species: demarcation and diversity

doi:10.1017/CBO9780511614927.003

3 - Species: demarcation and diversity

Published online by Cambridge University Press: 04 December 2009

Paul-Michael Agapow

Edited by

Andrew Purvis,

John L. Gittleman and

Thomas Brooks

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Paul-Michael Agapow: Affiliation:
Department of Biology, University College London, Darwin Building, Gower Street, London WC1E 6BT, UK
Andrew Purvis: Affiliation:
Imperial College of Science, Technology and Medicine, London
John L. Gittleman: Affiliation:
University of Virginia
Thomas Brooks: Affiliation:
Conservation International, Washington DC

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Summary

Arguments about conservation are almost always arguments about species. Lists are compiled of endangered species, conservation schemes are prioritised on how many species are preserved, and legislation is phrased in terms of species. In the political economy of biodiversity, species are the currency. Despite this central role, the very term ‘species’ is deeply ambiguous. Practitioners clash not only over the boundaries of individual species, but also over what ‘species’ means. Where once ‘the species problem’ referred to the puzzle of how species arose, it now refers to how species can be defined (Mallet 2001).

This argument has deep implications for conservation biology. As species definitions (and thus boundaries) shift, species counts may rise and fall. Areas of endemism based on species counts could change, and the conservation worth of populations with an ambiguous status (such as hybrids and sub-species) will fluctuate based on their taxonomic rank (Collar 1997). Given such doubt, how precise are our current understandings of species numbers and identity? Are these estimates good enough for conservation practice?

A DIVERSITY OF CONCEPTS

The argument over how species should be defined is endless, with over 20 species concepts presently in circulation (Claridge et al. 1997; Mayden 1997; Howard & Berlocher 1998). The problematic issue (at least for biodiversity studies) has been the gap between theory and practice. Although many concepts have been based on seemingly sound ideals, these tend to founder in the real world.

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Type: Chapter
Information: Phylogeny and Conservation , pp. 57 - 75
DOI: https://doi.org/10.1017/CBO9780511614927.003 [Opens in a new window]
Publisher: Cambridge University Press
Print publication year: 2005

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References

Agapow, P.-M., Bininda-Emonds, O. R. P., Crandall, K. A.et al. 2004 The impact of species concept on biodiversity studies. Quarterly Review of Biology 79, 161–79CrossRef Google Scholar PubMed

Amadon, D. & Short, L. L. 1992 Taxonomy of lower categories. Bulletin of the British Ornithological Club 112A, 11–38Google Scholar

Ameziane, N. & Roux, M. 1997 Biodiversity and historical biogeography of stalked crinoids (Echinodermata) in the deep sea. Biodiversity and Conservation 6, 1557–70CrossRef Google Scholar

Ando, A. W. 1999 Waiting to be protected under the Endangered Species Act: the political economy of regulatory delay. Journal of Law and Economics 42, 29–60CrossRef Google Scholar

Avise, J. C. & Johns, G. C. 1999 Proposal for a standardized temporal scheme of biological classification for extant species. Proceedings of the National Academy of Sciences, USA 96, 7358–63CrossRef Google Scholar PubMed

Avise, J. C. & Walker, D. 1999 Species realities and numbers in sexual vertebrates: perspectives from an asexually transmitted genome. Proceedings of the National Academy of Sciences, USA 96, 992–5CrossRef Google Scholar PubMed

Baillie, J. E. M. & Groombridge, B. 1996 IUCN Red List of Threatened Animals. Gland, Switzerland: International Union for the Conservation of Nature (IUCN)Google Scholar

Balharry, E., Staines, B. W., Marquiss, M. & Kruuk, H. 1994 Hybridisation in British Mammals. Peterborough, UK: Joint Nature Conservation Committee (JNCC)Google Scholar

Balmford, A. & Long, A. 1995 Across-country analyses of biodiversity congruence and current conservation effort in the tropics. Conservation Biology 9, 1539–47CrossRef Google Scholar

Baum, D. A. & Donoghue, M. J. 1995 Choosing among alternative ‘phylogenetic’ species concepts. Systematic Biology 20, 560–73Google Scholar

Bruna, E. M., Fisher, R. N. & Case, T. J. 1996 Morphological and genetic evolution appear decoupled in Pacific skinks (Squamata: Scincidae: Emoia). Proceedings of the Royal Society of London B263, 681–8CrossRef Google Scholar

Claridge, M. F., Dawah, H. A. & Wilson, M. R. 1997 Practical approaches to species concepts for living organisms. In Species: The Units of Biodiversity (ed. Claridge, M. F., Dawah, H. A. & Wilson, M. R.), pp. 1–15. London: Chapman and HallGoogle Scholar

Collar, N. J. 1996 Species concepts and conservation: a response to Hazevoet. Bird Conservation International 6, 197–200CrossRef Google Scholar

Collar, N. J. 1997 Taxonomy and conservation: chicken and egg. Bulletin of the British Ornithological Council 117, 122–36Google Scholar

Corbet, G. B. 1997 The species in mammals. In Species: The Units of Biodiversity (ed. Claridge, M. F., Dawah, H. A. & Wilson, M. R.), pp. 341–56. London: Chapman and HallGoogle Scholar

Cracraft, J. 1983 Species concepts and speciation analysis. Current Ornithology 1, 159–87CrossRef Google Scholar

Cracraft, J. 1992 The species of the birds-of-paradise (Paradisaeidae): applying the phylogenetic species concept to a complex pattern of diversification. Cladistics 8, 1–43CrossRef Google Scholar

Cracraft, J. 1997 Species concepts in systematics and conservation biology – an ornithological viewpoint. In Species: The Units of Biodiversity (ed. Claridge, M. F., Dawah, H. A. & Wilson, M. R.), pp. 325–39. London: Chapman and HallGoogle Scholar

Crandall, K. A., Bininda-Emonds, O. R. P., Mace, G. M. & Wayne, R. K. 2000 Considering evolutionary processes in conservation biology. Trends in Ecology and Evolution 15, 290–5CrossRef Google Scholar PubMed

Crozier, R. H. 1997 Preserving the information content of species: genetic diversity, phylogeny and conservation worth. Annual Reviews in Ecology and Systematics 28, 243–68CrossRef Google Scholar

Donoghue, M. J. 1985 A critique of the biological species concept and recommendation for a phylogenetic alternative. The Bryologist 88, 172–81CrossRef Google Scholar

Doyle, J. J. 1997 Trees with trees: Genes and species, molecules and morphology. Systematic Biology 46, 537–53CrossRef Google Scholar

Faith, D. P. 1994 Phylogenetic diversity: a general framework for the prediction of feature diversity. In Systematics and Conservation Evaluation (ed. Forey, P. L., Humphries, C. J. & Vane-Wright, R. I.), pp. 251–68. Oxford: Clarendon PressGoogle Scholar

Garcia-Moreno, J., Matocq, M. D., Roy, M. S., Geffen, E. & Wayne, R. K. 1996 Relationships and genetic purity of the endangered Mexican wolf based on analysis of microsatellite loci. Conservation Biology 10, 376–89CrossRef Google Scholar

Geiser, D. M., Pitt, J. I. & Taylor, J. W. 1998 Cryptic speciation and recombination in the aflatoxin-producing fungus Aspergillus flavus. Proceedings of the National Academy of Sciences, USA 95, 388–93CrossRef Google Scholar PubMed

Ghiselin, M. T. 1987 Species concepts, individuality, and objectivity. Biology and Philosophy 2, 127–43Google Scholar

Gittleman, J. L., Funk, S., Macdonald, D. W. & Wayne, R. W. 2001 Why ‘carnivore conservation’? In Carnivore Conservation (ed. Gittleman, J. L., Funk, S., Macdonald, D. W. & Wayne, R. W.), pp. 1–7. Cambridge: Cambridge University PressGoogle Scholar

Godfray, H. C. J. 2002 Challenges for taxonomy: the discipline will have to reinvent itself if it is to flourish. Nature 417, 17–19CrossRef Google Scholar

Gornall, R. J. 1997 Practical aspects of the species concept in plants. In Species: The Units of Biodiversity (ed. Claridge, M. F., Dawah, H. A. & Wilson, M. R.), pp. 171–90. London: Chapman and HallGoogle Scholar

Harrison, R. G. 1998 Linking evolutionary pattern and process. In Endless Forms (ed. Howard, D. J. & Berlocher, S. H.), pp. 19–31. Oxford: Oxford University PressGoogle Scholar

Hawksworth, D. L. 1993 The tropical fungal biota: census, pertinence, prophylaxis, and prognosis. In Aspects of Tropical Mycology (ed. Isaac, S., Frankland, J. S., Whalley, A. J. S. & Watling, R.), pp. 265–93. Cambridge: Cambridge University PressGoogle Scholar

Hennig, W. 1966 Phylogenetic Systematics. Urbana, IL: University of Illinois PressGoogle Scholar

Hey, J. 2001 Genes, Categories and Species. New York: Oxford University PressGoogle Scholar

Horvath, C. D. 1997 Discussion: phylogenetic species concept: pluralism, monism, and history. Biology and Philosophy 12, 225–32CrossRef Google Scholar

Howard, D. J. & Berlocher, S. H. (eds) 1998 Endless Forms: Species and Speciation. Urbana, IL: University of Illinois PressGoogle Scholar

International Council for Bird Preservation (ICBP). 1992 Putting Biodiversity on the Map: Priority Areas for Global Conservation. Cambridge: ICBP

Jepson, P. & Whittaker, R. J. 2002 Ecoregions in context: a critique illustrated with a case study of Indonesia. Conservation Biology 16, 1–16CrossRef Google Scholar

Kasuga, T., Taylor, J. W. & White, T. J. 1999 Phylogenetic relationships of varieties and geographical groups of the human pathogenic fungus Histoplasma capsulatum. Journal of Clinical Microbiology 37, 653–63Google Scholar PubMed

Klautau, M. C., Russo, A. M., Lazoski, C.et al. 1999 Does cosmopolitanism result from overconservative systematics? A case study using the marine sponge Chondrilla nucala. Evolution 53, 1414–22CrossRef Google Scholar

Knowlton, N. & Weigt, L. A. 1997 Species of marine invertebrates: a comparison of the biological and phylogenetic species concepts. In Species: The Units of Biodiversity (ed. Claridge, M. F., Dawah, H. A. & Wilson, M. R.), pp. 199–219. London: Chapman and HallGoogle Scholar

Lessios, H. A., Kessing, B. D. & Pearse, J. S. 2001 Population structure and speciation in tropical seas: global phylogeography of the sea urchin Diadema. Evolution 55, 955–75CrossRef Google Scholar PubMed

Levin, D. A. 1979 The nature of plant species. Science 204, 381–4CrossRef Google Scholar PubMed

Loreau, M., Naeem, S. & Inchausti, P. (eds) 2002 Biodiversity and Ecosystem Functioning: Synthesis and Perspective. Oxford: Oxford University PressGoogle Scholar

Mallet, J. 2001 Concepts of species. Encyclopedia of Biodiversity 5, 427–40CrossRef Google Scholar

Mann, C. C. & Plummer, M. L. 1995 Noah's Choice. New York: KnopfGoogle Scholar

May, R. M. 1990 Taxonomy as destiny. Nature 347, 129–30CrossRef Google Scholar

Mayden, R. L. 1997 A hierarchy of species concepts: the denouement of the saga of the species problem. In Species: The Units of Biodiversity (ed. Claridge, M. F., Dawah, H. A. & Wilson, M. R.), pp. 381–424. London: Chapman and HallGoogle Scholar

Mayr, E. 1963 Populations, Species and Evolution. Cambridge, MA: Harvard University PressCrossRef Google Scholar

Mayr, E. 1982 The Growth of Biological Thought. Cambridge, MA: BelknapGoogle Scholar

Mayr, E. 1992 A local flora and the biological species concept. American Journal of Botany 79, 222–38CrossRef Google Scholar

McKitrick, M. C. & Zink, R. M. 1988 Species concepts in ornithology. Condor 90, 1–14CrossRef Google Scholar

Mindell, D. P. & Meyer, A. 2001 Homology evolving. Trends in Ecology and Evolution 16, 434–40CrossRef Google Scholar

Mishler, B. D. 1985 The morphological, developmental, and phylogenetic basis of species concepts in bryophytes. The Bryologist 88, 207–14CrossRef Google Scholar

Moulton, M. P. & Sanderson, J. G. 1999 Wildlife Issues in a Changing World. Delray, FL: St. Lucie PressGoogle Scholar

Nixon, K. C. & Wheeler, Q. D. 1990 An amplification of the phylogenetic species concept. Cladistics 6, 211–23CrossRef Google Scholar

Owens, I. P. F. & Bennett, P. M. 2000 Quantifying biodiversity: a phenotypic perspective. Conservation Biology 14, 1014–22CrossRef Google Scholar

Peterson, A. T. & Navarro-Sigüenza, A. G. 1999 Alternate species concepts as bases for determining priority conservation areas. Conservation Biology 13, 427–31CrossRef Google Scholar

Pitman, N. C. A. & Jorgenson, P. M. 2002 Estimating the size of the world's threatened flora. Science 298, 989CrossRef Google Scholar PubMed

Platnick, N. I. 1999 Dimensions of biodiversity: targeting megadiverse groups. In The Living Planet: Biodiversity Science and Policy (ed. Cracraft, J. & Grifo, F. T.), pp. 33–52. New York: Columbia University PressGoogle Scholar

Possingham, H. P., Andelman, S. J., Burgman, M. A.et al. 2002 Limits to the use of threatened species lists. Trends in Ecology and Evolution 17, 503–7CrossRef Google Scholar

Rieseberg, R. H. & Gerber, D. 1995 Hybridization in the Catalina mountain mahogany (Cercocarpus traskiae): RAPD evidence. Conservation Biology 9, 199–203CrossRef Google Scholar

Ryder, O. A. 1986 Species conservation and systematics: the dilemma of subspecies. Trends in Ecology and Evolution 1, 9–10CrossRef Google Scholar

Sites, J. W. Jr & Crandall, K. A. 1997 Testing species boundaries in biodiversity studies. Conservation Biology 11, 1289–97CrossRef Google Scholar

Slowinski, J. B. & Page, R. D. M. 1999 How should species phylogenies be inferred from sequence data?Systematic Biology 48, 814–25CrossRef Google Scholar PubMed

Soltis, P. S. & Gitzendanner, M. A. 1999 Molecular systematics and the conservation of rare species. Conservation Biology 13, 471–83CrossRef Google Scholar

Syvanen, M. 1999 In search of horizontal gene transfer. Nature Biotechnology 17, 833CrossRef Google Scholar PubMed

Taylor, E. B. 1999 Species pairs of north temperate freshwater fishes: evolution, taxonomy and conservation. Reviews in Fish Biology and Fisheries 9, 299–324CrossRef Google Scholar

Taylor, J. W., Jacobson, D. J. & Fisher, M. C. 1999 The evolution of asexual fungi: reproduction, speciation and classification. Annual Review of Phytopathology 37, 197–246CrossRef Google Scholar PubMed

Taylor, J. W., Jacobsen, D. J., Kroken, S.et al. 2000 Phylogenetic species recognition and species concepts in fungi. Fungal Genetics and Biology 31, 21–32CrossRef Google Scholar

Thacker, R. W. & Hadfield, M. G. 2000 Mitochondrial phylogeny of extant Hawaiin tree snails (Achatinellinae). Molecular Phylogenetics and Evolution 16, 263–70CrossRef Google Scholar

Turner, G. F. 1999 What is a fish species?Reviews in Fish Biology and Fisheries 9, 281–97CrossRef Google Scholar

United States Fisheries & Wildlife Service (USFWS) 1994 Endangered and Threatened Wildlife and Plants. Document 1994 – 380-789/20165. Washington, DC: US Government Printing Office

Walsh, P. D. 2000 Sample size for the diagnosis of conservation units. Conservation Biology 14, 1533–7CrossRef Google Scholar

Wiens, J. J. & Penkrot, T. A. 2002 Delimiting species using DNA and morphological variation in spiny lizards (Sceloporus). Systematic Biology 51, 69–91CrossRef Google Scholar

Wilkins, J. S. 2005 How to be a chaste species pluralist-realist. Biology and Philosophy, in pressGoogle Scholar

Williams, P. H. & Gaston, K. 1994 Measuring more of biodiversity: can higher-taxon richness predict wholesale species richness. Biological Conservation 67, 211–17CrossRef Google Scholar

Wilson, E. O. 2003 The encyclopedia of life. Trends in Ecology and Evolution 18, 77–80CrossRef Google Scholar

Zink, R. M. & McKitrick, M. C. 1995 The debate of species concepts and its implications for ornithology. Auk 112, 701–19Google Scholar

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