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<p>Night light pollution causes disruption in the feeding and nocturnal sleep in both diurnal and nocturnal species. Here, we investigated if a periodic return to normal dark nights could mitigate these negative effects in a diurnal bird species. Zebra finches were exposed to 12&#xa0;h light (150&#xa0;lx) coupled with 12&#xa0;h complete darkness (0&#xa0;lx, control) or with alternating 2&#xa0;weeks of dimly illuminated (5&#xa0;lx) and complete (0&#xa0;lx) dark nights (experiment) for eight weeks. The food intake, subcutaneous fattening, body mass, nocturnal feeding and sleep patterns, and plasma glucose levels were recorded every two weeks, while the plasma triglycerides and oxalate levels were measured at the end of the experiment. As compared to control birds exposed 12&#xa0;h complete dark nights, those exposed to dimly illuminated nights showed disruptions in the feeding and nocturnal sleep. This was evidenced by the fat deposition and body mass gain, and changes in sleep variables and plasma glucose, triglycerides, and oxalate levels. Most interestingly, the periodic return to normal dark nights mitigated all the negative effects of the preceding illuminated night exposure. We suggest the inclusion of periodic returns to normal dark nights as a potential non-invasive mitigation strategy in situations where exposure to illuminated nights is necessary or inevitable in the long term.</p>

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Intervening periods of normal dark nights mitigate the negative effects of night-light pollution on feeding and nocturnal sleep in diurnal zebra finch, Taeniopygia guttata

  • 期刊论文

  • 发表日期：

    2025年11月11日

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  • Mayank Kumar,
  • Ashwani Kumar,
  • Vatsala Tripathi,
  • Sanjay Kumar Bhardwaj

摘要

Night light pollution causes disruption in the feeding and nocturnal sleep in both diurnal and nocturnal species. Here, we investigated if a periodic return to normal dark nights could mitigate these negative effects in a diurnal bird species. Zebra finches were exposed to 12 h light (150 lx) coupled with 12 h complete darkness (0 lx, control) or with alternating 2 weeks of dimly illuminated (5 lx) and complete (0 lx) dark nights (experiment) for eight weeks. The food intake, subcutaneous fattening, body mass, nocturnal feeding and sleep patterns, and plasma glucose levels were recorded every two weeks, while the plasma triglycerides and oxalate levels were measured at the end of the experiment. As compared to control birds exposed 12 h complete dark nights, those exposed to dimly illuminated nights showed disruptions in the feeding and nocturnal sleep. This was evidenced by the fat deposition and body mass gain, and changes in sleep variables and plasma glucose, triglycerides, and oxalate levels. Most interestingly, the periodic return to normal dark nights mitigated all the negative effects of the preceding illuminated night exposure. We suggest the inclusion of periodic returns to normal dark nights as a potential non-invasive mitigation strategy in situations where exposure to illuminated nights is necessary or inevitable in the long term.