publication . Article . 2015

Ambiguity in guideline definitions introduces assessor bias and influences consistency in IUCN Red List status assessments

Matt W. Hayward; Matthew F. Child; Graham I. H. Kerley; Peter A. Lindsey; Michael J. Somers; Bruce R. Burns;
Open Access English
  • Published: 01 Jul 2015 Journal: Frontiers in Ecology and Evolution, volume 3
  • Publisher: Frontiers Media S.A.
The IUCN Red List is the most widely used tool to measure extinction risk and report biodiversity trends. Accurate and standardised conservation status assessments for the IUCN Red List are limited by a lack of adequate information; and need consistent and unbiased interpretation of that information. Variable interpretation stems from a lack of quantified thresholds in certain areas of the Red List guidelines. Thus, even in situations with sufficient information to make a Red List assessment, inconsistency can occur when experts, especially from different regions, interpret the guidelines differently, thereby undermining the goals and credibility of the process....
Persistent Identifiers
free text keywords: Biodiversity, IUCN Red list, Threatened species, Conservation status assessment, Conservation benchmark, assessor bias, Ecology and Evolution, conservation assessment, status assessment process, mainland islands, fencing for conservation, metapopulation management, lcsh:Evolution, lcsh:QH359-425, lcsh:Ecology, lcsh:QH540-549.5, Actuarial science, Environmental resource management, business.industry, business, Accreditation, Psychology, Credibility, Publishing, Ambiguity, media_common.quotation_subject, media_common, Conservation status, Psychological intervention
78 references, page 1 of 6

Ackermann R. R. Brink J. S. Vrahimis S. De Klerk B. (2010). Hybrid wildebeest (Artiodactyla: Bovidae) provide further evidence for shared signat ures of admixture in mammalian crania. S. Afr. J. Sci. 106, 1–4. 10.4102/sajs.v106i11/12.423 [OpenAIRE] [DOI]

Ahrends A. Burgess N. D. Gereau R. E. Marchant R. Bulling M. T. Lovett J. C. . (2011). Funding begets biodiversity. Divers. Distribut. 17, 191–200. 10.1111/j.1472-4642.2010.00737.x [OpenAIRE] [DOI]

Al Jahdhami M. Al-Mahdhoury S. Al Amri H. (2010). The re-introduction of Arabian oryx to the Al Wusta Wildlife Reserve in Oman: 30 years on, in Global Re-introduction Perspectives: 2011: More Case Studies from Around the Globe, ed Soorae P. S. (Abu Dhabi: IUCN Species Survival Commission's Reintroduction Specialist Group), 194–198.

Bakker V. J. Baum J. K. Brodie J. F. Salomon A. K. Dickson B. G. Gibbs H. K. . (2010). The changing landscape of conservation science funding in the United States. Conserv. Lett. 3, 435–444. 10.1111/j.1755-263X.2010.00125.x [DOI]

Birdlife International. (2012a). Anas chlorotis, in IUCN Red List of Threatened Species. Version 2014.3 Downloaded 01/06/2015 (Gland: IUCN). Available online at:

Birdlife International. (2012b). Dendroica Kirtlandii [Online]. Gland: IUCN. (Accessed 2/5/2014).

Birdlife International (2013). Manorina Melanotis [Online]. Gland: IUCN. (Accessed 2/5/2014).

Breitenmoser U. Mallon D. Von Arx M. Breitenmoser-Wursten C. (2008). Lynx lynx., in IUCN Red List of Threatened Species Version 2014.2, (Gland: IUCN). Available online at: (Accessed September 11, 2014).

Burbidge A. A. Johnson K. A. Fuller P. J. Southgate R. I. (1988). Aboriginal knowledge of the mammals of the central deserts of Australia. Aust. Wildl. Res. 15, 9–39. 10.1071/WR9880009 24615581 [OpenAIRE] [PubMed] [DOI]

Burbidge A. A. McKenzie N. L. (1989). Patterns in the modern decline of Western Australia's vertebrate fauna: causes and conservation implications. Biol. Conserv. 50, 143–198. 10.1016/0006-3207(89)90009-8 [OpenAIRE] [DOI]

Burbidge A. Woinarski J. Harrison P. (2014). The Action Plan for Australian Mammals 2012. Melbourne: CSIRO PUBLISHING.

Butchart S. H. M. Akcakaya H. R. Kennedy E. Hilton-Taylor C. (2006). Biodiversity indicators based on trends in conservation status: strengths of the IUCN red list index. Conserv. Biol. 20, 579–581. 10.1111/j.1523-1739.2006.00410.x 16903120 [OpenAIRE] [PubMed] [DOI]

Butchart S. H. M. Stattersfield A. J. Baillie J. Bennun L. Stuart S. N. Akcakaya H. R. . (2005). Using Red List Indices to measure progress towards the 2010 target and beyond. Philos. Trans. R. Soc. Lond. Ser. B Biol. Sci. 360, 255–268. 10.1098/rstb.2004.1583 [OpenAIRE] [DOI]

Champagnon J. Elmberg J. Guillemain M. Gauthier-Clerc M. Lebreton J.-D. (2012). Conspecifics can be aliens too: a review of effects of restocking practices in vertebrates. J. Nat. Conserv. 20, 231–241. 10.1016/j.jnc.2012.02.002 [OpenAIRE] [DOI]

Chapple D. G. (2010). Oligosoma Otagense, in IUCN Red List of Threatened Species. Version 2014.3 Downloaded 01/06/2015, (Gland: IUCN). Available online at:

78 references, page 1 of 6
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