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Using Red List Indices to measure progress towards the 2010 target and beyond.

S H M Butchart1, A J Stattersfield, J Baillie

  • 1BirdLife International, Wellbrook Court, Girton Road, Cambridge CB3 0NA, UK. stuart.butchart@birdlife.org

Philosophical Transactions of the Royal Society of London. Series B, Biological Sciences
|April 9, 2005
PubMed
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The World Conservation Union Red List Indices reveal a steady increase in extinction risk for birds and amphibians globally. These indices track changes in species threat status, highlighting a concerning trend in biodiversity decline.

Area of Science:

  • Conservation Biology
  • Ecology
  • Biodiversity Science

Background:

  • The International Union for Conservation of Nature (IUCN) Red List is the leading global system for assessing species extinction risk.
  • Red List Indices (RLIs) quantify changes in the conservation status of species over time.
  • RLIs are calculated using data on population size, range, and trends for fully assessed species.

Purpose of the Study:

  • To illustrate the utility of Red List Indices (RLIs) in tracking biodiversity threat status.
  • To present trends in extinction risk for key taxonomic groups, specifically birds and amphibians.
  • To introduce the development of a sampled index for more comprehensive biodiversity trend analysis.

Main Methods:

  • Calculating RLIs based on species reassessments and changes in IUCN Red List categories.

Related Experiment Videos

  • Analyzing RLI data for birds globally from 1988-2004 across all biogeographic realms and ecosystems.
  • Compiling a preliminary RLI for amphibians from 1980-2004.
  • Developing a sampled index using a stratified sample of species across major taxonomic groups, realms, and ecosystems.

    • Main Results:

    • The RLI for birds demonstrates a consistent deterioration in threat status globally between 1988 and 2004.
    • A preliminary RLI for amphibians indicates similar rates of decline in conservation status over the period 1980-2004.
    • RLIs provide a valuable, albeit coarse, resolution for understanding extinction-risk trends in fully assessed taxonomic groups.

    Conclusions:

    • Global biodiversity, represented by birds and amphibians, shows a significant increasing trend in extinction risk.
    • RLIs are effective tools for monitoring conservation status and highlighting the need for targeted conservation actions.
    • Ongoing development of sampled indices aims to provide more representative biodiversity extinction-risk trends across all life forms.