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Over a century of data reveal more than 80% decline in butterflies in the Netherlands.

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Title: Over a century of data reveal more than 80% decline in butterflies in the Netherlands.
Authors: van Strien, Arco J.1 (AUTHOR) asin@cbs.nl, van Swaay, Chris A.M.1 (AUTHOR), van Strien-van Liempt, Willy T.F.H.1 (AUTHOR), Poot, Martin J.M.1 (AUTHOR), WallisDeVries, Michiel F.1 (AUTHOR)
Source: Biological Conservation. Jun2019, Vol. 234, p116-122. 7p.
Subject Terms: *Grasslands, *Species, *Forests & forestry, *Habitats, Butterflies
Geographic Terms: Netherlands
Abstract: Opportunistic butterfly records from 1890 to 2017 were analysed to quantitatively estimate the overall long-term change in occurrence of butterfly species in the Netherlands. For 71 species, we assessed trends in the number of occupied 5 km × 5 km sites by applying a modified List Length method, which takes into account changes in observation effort. We summarised the species trends in a Multi-Species Indicator (MSI) by taking the geometric mean of the species indices. Between 1890–1930 and 1981–1990, the MSI decreased by 67%; downward trends were detected for 42 species, many of which have disappeared completely from the Netherlands. Monitoring count data available from 1992 showed a further 50% decline in MSI. Combined, this yields an estimated decline of 84% in 1890–2017. We argue that in reality the loss is likely even higher. We also assessed separate MSIs for three major butterfly habitat types in the Netherlands: grassland, woodland and heathland. Butterflies strongly declined in all three habitats alike. The trend has stabilised over recent decades in grassland and woodland, but the decline continues in heathland. [ABSTRACT FROM AUTHOR]
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Database: GreenFILE
Description
Abstract:Opportunistic butterfly records from 1890 to 2017 were analysed to quantitatively estimate the overall long-term change in occurrence of butterfly species in the Netherlands. For 71 species, we assessed trends in the number of occupied 5 km × 5 km sites by applying a modified List Length method, which takes into account changes in observation effort. We summarised the species trends in a Multi-Species Indicator (MSI) by taking the geometric mean of the species indices. Between 1890–1930 and 1981–1990, the MSI decreased by 67%; downward trends were detected for 42 species, many of which have disappeared completely from the Netherlands. Monitoring count data available from 1992 showed a further 50% decline in MSI. Combined, this yields an estimated decline of 84% in 1890–2017. We argue that in reality the loss is likely even higher. We also assessed separate MSIs for three major butterfly habitat types in the Netherlands: grassland, woodland and heathland. Butterflies strongly declined in all three habitats alike. The trend has stabilised over recent decades in grassland and woodland, but the decline continues in heathland. [ABSTRACT FROM AUTHOR]
ISSN:00063207
DOI:10.1016/j.biocon.2019.03.023