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Grenyer et al. reply

Author

Listed:
  • Richard Grenyer

    (NERC Centre for Population Biology, Imperial College London, Silwood Park Campus)

  • C. David L. Orme

    (Imperial College London, Silwood Park Campus)

  • T. Jonathan Davies

    (‡ National Center for Ecological Analysis and Synthesis, 735 State Street, Suite 300, Santa Barbara, California 93101, USA)

  • Sarah F. Jackson

    (Biodiversity and Macroecology Group, University of Sheffield)

  • Richard G. Davies

    (Centre for Ecology, Evolution and Conservation, School of Biological Sciences, University of East Anglia)

  • Valerie A. Olson

    (University of Bath)

  • Kate E. Jones

    (# Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, UK)

  • Kevin J. Gaston

    (Biodiversity and Macroecology Group, University of Sheffield)

  • Tim M. Blackburn

    (# Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, UK)

  • Gavin H. Thomas

    (NERC Centre for Population Biology, Imperial College London, Silwood Park Campus)

  • Peter M. Bennett

    (# Institute of Zoology, Zoological Society of London, Regents Park, London NW1 4RY, UK
    †Present address: Durrell Institute of Conservation and Ecology, Marlowe Building, University of Kent, Canterbury, Kent CT2 7NR, UK)

  • Pamela C. Rasmussen

    (Michigan State University Museum and Department of Zoology)

  • Tzung-Su Ding

    (School of Forestry and Resource Conservation, National Taiwan University)

  • John L. Gittleman

    (Odum School of Ecology, University of Georgia)

  • Ian P. F. Owens

    (NERC Centre for Population Biology, Imperial College London, Silwood Park Campus
    Imperial College London, Silwood Park Campus)

Abstract

Replying to: A. S. L. Rodrigues Nature 450, 10.1038/nature06374 (2007) Rodrigues1 criticizes our demonstration2 of low congruence in the global distributions of rare and threatened vertebrates on the grounds that we excluded locations where species counts were zero from our analyses. In practice, this makes no substantive difference to our conclusions. Some sample locations are not inhabited by any organisms of interest: such locations can inflate measures of covariation and association because their values for parameters of interest (in this case, zero counts of species) are identical. This bias has long been known (as ‘the double-zero problem’3); many ecological techniques and studies exclude double-zero data for this reason.

Suggested Citation

  • Richard Grenyer & C. David L. Orme & T. Jonathan Davies & Sarah F. Jackson & Richard G. Davies & Valerie A. Olson & Kate E. Jones & Kevin J. Gaston & Tim M. Blackburn & Gavin H. Thomas & Peter M. Benn, 2007. "Grenyer et al. reply," Nature, Nature, vol. 450(7171), pages 20-20, December.
    • Handle: RePEc:nat:nature:v:450:y:2007:i:7171:d:10.1038_nature06375
    DOI: 10.1038/nature06375
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