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U.S.A."],"published-print":{"date-parts":[[2024,10,15]]},"abstract":"<jats:p>One of the most dramatic changes occurring on our planet is the ever-increasing extensive use of artificial light at night, which drastically altered the environment to which nocturnal animals are adapted. Such light pollution has been identified as a driver in the dramatic insect decline of the past years. One nocturnal species group experiencing marked declines are moths, which play a key role in food webs and ecosystem services such as plant pollination. Moths can be easily monitored within the illuminated area of a streetlight, where they typically exhibit disoriented behavior. Yet, little is known about their behavior beyond the illuminated area. Harmonic radar tracking enabled us to close this knowledge gap. We found a significant change in flight behavior beyond the illuminated area of a streetlight. A detailed analysis of the recorded trajectories revealed a barrier effect of streetlights on lappet moths whenever the moon was not available as a natural celestial cue. Furthermore, streetlights increased the tortuosity of flights for both hawk moths and lappet moths. Surprisingly, we had to reject our fundamental hypothesis that most individuals would fly toward a streetlight. Instead, this was true for only 4% of the tested individuals, indicating that the impact of light pollution might be more severe than assumed to date. Our results provide experimental evidence for the fragmentation of landscapes by streetlights and demonstrate that light pollution affects movement patterns of moths beyond what was previously assumed, potentially affecting their reproductive success and hampering a vital ecosystem service.<\/jats:p>","DOI":"10.1073\/pnas.2401215121","type":"journal-article","created":{"date-parts":[[2024,10,8]],"date-time":"2024-10-08T12:10:41Z","timestamp":1728389441000},"update-policy":"https:\/\/doi.org\/10.1073\/pnas.cm10313","source":"Crossref","is-referenced-by-count":27,"title":["Shedding light with harmonic radar: Unveiling the hidden impacts of streetlights on moth flight behavior"],"prefix":"10.1073","volume":"121","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-9247-7356","authenticated-orcid":false,"given":"Jacqueline","family":"Degen","sequence":"first","affiliation":[{"name":"Department of Behavioral Physiology and Sociobiology, University of W\u00fcrzburg, W\u00fcrzburg 97074, 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