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Adverse effects of artificial illumination on bat drinking activity

Research output: Contribution to journalArticle

Original languageEnglish
Pages (from-to)492-501
Number of pages10
JournalAnimal Conservation
Issue number6
Early online date17 Feb 2017
DateAccepted/In press - 10 Jan 2017
DateE-pub ahead of print - 17 Feb 2017
DatePublished (current) - Dec 2017


Artificial illumination at night (ALAN) alters many aspects of animal behaviour. Commuting and foraging bats have been found to be affected by ALAN, but no study has yet addressed the impact of lighting on drinking activity, despite its critical importance for bats. We experimentally illuminated cattle troughs used by drinking bats at four forest sites in Italy, and compared drinking activity and foraging activity under lit and dark conditions. We predicted that (1) the number of bat species and drinking events will be lower under illumination and (2) forest bat species will be more affected than edge specialists. We recorded 2549 drinking events from 12 species or species groups, most of which decreased drinking activity under illumination. The effects of ALAN on drinking were stronger than on foraging. Forest species never drank when the light was on. Edge-foraging species reduced drinking activity while also increasing foraging under lit conditions. We highlight a previously overlooked negative effect of ALAN on bats, whose implications may be locally catastrophic. Given the importance of water sites for both bat foraging and drinking, their illumination should be forbidden, appropriately mitigated or, if necessary, compensated for with the creation of alternative drinking sites.

    Research areas

  • aquatic habitat, Chiroptera, dehydration, foraging, light pollution, light-emitting diode, ultrasound

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    Rights statement: This is the author accepted manuscript (AAM). The final published version (version of record) is available online via Wiley at;. Please refer to any applicable terms of use of the publisher.

    Accepted author manuscript, 343 KB, PDF document

    Licence: CC BY-NC


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