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Brehm, Gunnar; Niermann, Julia; Jaimes Nino, Luisa Maria; Enseling, David; Jüstel, Thomas; Axmacher, Jan Christoph; Warrant, Eric; Fiedler, Konrad
Insect conservation and diversity, March 2021, Volume: 14, Issue: 2Journal Article
We carried out three choice experiments with 6116 nocturnal lepidopteran individuals (95 species, 7 families, 32 075 counts), each replicated 105 times during the seasons of 2 years. Moths were released indoors at the centre of a 10 × 10 m area with different lamps placed at each corner. In experiment 1, lamps emitted ultraviolet (UV) (peak at 365 nm), blue (450 nm), green (520 nm) or cool white (450 and 520 nm) radiation. In experiment 2, UV was replaced by red (640 nm). In experiment 3, we used UV and three mixed radiation lamps of different emission intensities (365–520 nm). We applied a linear mixed effect model to test for differences in attraction to the light sources. Among all counts, 12.2% (males) and 9.2% (females) were attracted to a lamp. Among the lamp counts, 84% were made at the UV lamp in experiment 1. In experiment 2, 63% of the counts were made at the blue lamp. In experiment 3, most counts were made at the strongest mixed radiation lamp (31%), and the UV lamp (28%). Patterns were generally similar across Lepidopteran families, and for both sexes. Moths are clearly preferentially attracted to short‐wave radiation. Even small quantities of UV radiation, emitted, for example, by metal halide lamps and certain mercury vapour tubes, will disproportionately contribute to light pollution. Since blue light also attracts moths strongly, lamps with a low proportion of blue light should be given priority in lighting planning. Three choice experiments with 6116 nocturnal lepidopteran individuals (95 species) were carried out under controlled conditions. In experiment 1, 84 % of the counts were made at the UV lamp. In experiment 2, 63 % of the counts were made at the blue lamp. In experiment 3, most counts were made at the strongest mixed radiation lamp (UVmix+++: 31 %), and the UV lamp (28 %). Patterns were generally similar across Lepidopteran families, and for both sexes. Moths are clearly preferentially attracted to short‐wave radiation. UV radiation and light with a high share of blue light are therefore particularly important for light pollution.
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