A new methodology for compiling national Red Lists applied to butterflies (Lepidoptera, Rhopalocera) in Flanders (N-Belgium) and the Netherlands

Dirk Maes, C. A. M van Swaay

    Research output: Contribution to journalA1: Web of Science-article

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    Abstract

    The compilation of the Red Lists of butterflies in Flanders and the Netherlands was based on two criteria: a trend criterion (degree of decline) and a rarity criterion (actual distribution area). However, due to the large difference in mapping intensity in the two compared periods, a straightforward comparison of the number of grid cells in which each species was recorded, appeared inappropriate. To correct for mapping intensity we used reference species that are homogeneously distributed over the country, that have always been fairly common and that did not fluctuate in abundance too much during this century. For all resident species a relative presence in two compared periods was calculated, using the average number of grid cells in which these reference species were recorded as a correction factor. The use of a standardized method and well-defined quantitative criteria makes national Red Lists more objective and easier to re-evaluate in the future and facilitates the comparison of Red Lists among countries and among different organisms. The technique applied to correct for mapping intensity could be useful to other organisms when there is a large difference in mapping intensity between two periods.
    Original languageEnglish
    JournalJournal of insect conservation
    Volume1
    Issue number2
    Pages (from-to)113-124
    Number of pages12
    DOIs
    Publication statusPublished - 1997

    Thematic list

    • Insects
    • Red lists

    EWI Biomedical sciences

    • B280-animal-ecology

    Taxonomic list

    • butterflies (Lepidoptera)

    Policy

    • nature policy

    Geographic list

    • Flanders
    • Netherlands

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