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Master Thesis

Effets de différents spectres lumineux sur l'activité et le déplacement des chiroptères le long d'une lisière forestière

Abstract : Light pollution has shown a spectacular increase over the past decades. Effects of artificial light at night are reported for many species group. Among these, bats are strongly affected, and how bat species react to light vary with light colour. We experimented on five fields sites in the Netherlands to study the response of bats to three different light spectra in an otherwise dark and undisturbed area. We measured activity of several bat species 20 m away and on both side of light posts emitting white, green and red lights. From these data, we reconstructed acoustic flight path of bats across the light of the light post for several flight speeds. Results on bats activity reveal that the slow-flying and forest-dwelling Myotis and Plecotus species avoided all light sources, whereas the more agile and common Pipistrellus as well as Eptesicus and Nyctalus species were attracted by white and green lights, probably to feed. However, results on bat crossings highlight that Pipistrellus species avoided crossing green light, whatever their flying speed. Thus, green lights are avoided by Pipistrellus species and are likely to fragment their habitat. In order to limit the negative impact of light at night on bats, green lights should be avoided along ecological continuities.
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Master Thesis
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https://dumas.ccsd.cnrs.fr/dumas-02385738
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Submitted on : Friday, November 29, 2019 - 8:45:39 AM
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Iuna Thomas. Effets de différents spectres lumineux sur l'activité et le déplacement des chiroptères le long d'une lisière forestière. Sciences du Vivant [q-bio]. 2019. ⟨dumas-02385738⟩

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