Artificial light at night desynchronizes strictly seasonal reproduction in a wild mammal

Kylie A. Robert, John A. Lesku, Jesko Partecke, Brian Chambers

Research output: Contribution to journalArticlepeer-review

118 Citations (Scopus)


Change in day length is an important cue for reproductive activation in seasonally breeding animals to ensure that the timing of greatest maternal investment (e.g. lactation in mammals) coincides with favourable environmental conditions (e.g. peak productivity). However, artificial light at night has the potential to interfere with the perception of such natural cues. Following a 5-year study on two populations of wild marsupial mammals exposed to different night-time levels of anthropogenic light, we show that light pollution in urban environments masks seasonal changes in ambient light cues, suppressing melatonin levels and delaying births in the tammarwallaby. These results highlight a previously unappreciated relationship linking artificial light at night with induced changes in mammalian reproductive physiology, and the potential for larger-scale impacts at the population level.

Original languageEnglish
Article number20151745
JournalProceedings of the Royal Society B: Biological Sciences
Issue number1816
Publication statusPublished - 30 Sept 2015


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