A role for artificial night-time lighting in long-term changes in populations of 100 widespread macro-moths in UK and Ireland: a citizen-science study |
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Authors: | John Fawcett Wilson David Baker Janet Cheney Mike Cook Martin Ellis Roger Freestone David Gardner Graham Geen Robin Hemming Don Hodgers Stephen Howarth Ade Jupp Norman Lowe Steve Orridge Mark Shaw Bob Smith Audrey Turner Heather Young |
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Affiliation: | 1.UK and Ireland Garden Moth Scheme (GMS),http://www.gardenmoths.org.uk;2.Min y Nant,Brecon, Powys,UK |
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Abstract: | The abundance of 100 of the most widespread species of macro-moth in the UK and Ireland was estimated from light-trap records reported to the UK and Ireland Garden Moth Scheme between 2005 and 2015. Recording sites were classified into low, medium and high night-time illumination categories by satellite imagery, into land-use types from the dominant use in the 1–2 km surrounding area, and by latitude. Most urban sites were in the group classified as having high night-time illumination. Comparison between medium and low night-time illuminated sites allowed differences between levels of illumination free from the effect of urbanization on moth abundance to be assessed. The medium and low night-time illuminated sites differed significantly in the frequency of grassland and arable land-use types and in geographic location with more grassland and north-western sites in the low-light category. After adjustment for these differences and for variations between taxonomic family groups, the medium to low night-time lighting abundance ratios explained a significant (P?0.001) 20% of the variance in long-term changes in moth abundance reported by the Rothamsted Insect Survey for the years 1968–2002. This is the first demonstration that artificial night-time lighting has had, in combination with other factors, a significant influence on levels of abundance of moth populations. |
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