Calculating population reductions of invertebrate species for IUCN Red List assessments

H. Reşit Akçakaya, Axel Hochkirch, Jason T. Bried, Roy H. A. van Grunsven, John P. Simaika, Geert De Knijf, Sérgio Henriques

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Population reductions are often used to assess extinction risk of species in the IUCN Red List. Guidelines for Red List assessments describe specific methods for calculating the amount of reduction for species with strongly fluctuating populations. Recently, an alternative approach that involves expert opinion has been suggested for calculating population reduction in insect species. We argue that, while populations with high temporal variability do present challenges, the alternative suggestion is unnecessary, and inconsistent with the IUCN Red List Categories and Criteria.
Original languageEnglish
JournalJournal of insect conservation
Publication statusE-pub ahead of print - 11-Mar-2021

Thematic List 2020

  • Other

Thematic list

  • Insects
  • Species and biotopes
  • Fauna
  • Red lists

EWI Biomedical sciences

  • B003-ecology

Taxonomic list

  • insects (Insecta)


  • biodiversity policy

Geographic list

  • World


  • evaluation techniques
  • statistics and modelling

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