Insect communities under skyglow: diffuse night-time illuminance induces spatio-temporal shifts in movement and predation

Dyer, Alexander, Ryser, Remo, Brose, Ulrich, Amyntas, Angelos, Bodnar, Nora, Boy, Thomas, Bucher, Solveig Franziska, Cesarz, Simone, Eisenhauer, Nico, Gebler, Alban, Hines, Jes, Kyba, Christopher C.M., Menz, Myles H.M., Rackwitz, Karl, Shatwell, Tom, Terlau, Jördis F., and Hirt, Myriam R. (2023) Insect communities under skyglow: diffuse night-time illuminance induces spatio-temporal shifts in movement and predation. Philosophical Transactions of the Royal Society B: Biological Sciences, 378 (1892). 20220359.

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Artificial light at night (ALAN) is predicted to have far-reaching consequences for natural ecosystems given its influence on organismal physiology and behaviour, species interactions and community composition. Movement and predation are fundamental ecological processes that are of critical importance to ecosystem functioning. The natural movements and foraging behaviours of nocturnal invertebrates may be particularly sensitive to the presence of ALAN. However, we still lack evidence of how these processes respond to ALAN within a community context. We assembled insect communities to quantify their movement activity and predation rates during simulated Moon cycles across a gradient of diffuse night-time illuminance including the full range of observed skyglow intensities. Using radio frequency identification, we tracked the movements of insects within a fragmented grassland Ecotron experiment. We additionally quantified predation rates using prey dummies. Our results reveal that even low-intensity skyglow causes a temporal shift in movement activity from day to night, and a spatial shift towards open habitats at night. Changes in movement activity are associated with indirect shifts in predation rates. Spatio-temporal shifts in movement and predation have important implications for ecological networks and ecosystem functioning, highlighting the disruptive potential of ALAN for global biodiversity and the provision of ecosystem services.

Item ID: 80802
Item Type: Article (Research - C1)
ISSN: 1471-2970
Copyright Information: © 2023 The Author(s) Published by the Royal Society. All rights reserved.
Date Deposited: 02 Nov 2023 02:37
FoR Codes: 31 BIOLOGICAL SCIENCES > 3103 Ecology > 310301 Behavioural ecology @ 40%
31 BIOLOGICAL SCIENCES > 3103 Ecology > 310302 Community ecology (excl. invasive species ecology) @ 40%
41 ENVIRONMENTAL SCIENCES > 4104 Environmental management > 410401 Conservation and biodiversity @ 20%
SEO Codes: 18 ENVIRONMENTAL MANAGEMENT > 1806 Terrestrial systems and management > 180606 Terrestrial biodiversity @ 100%
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