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Midnight darkness and evening melatonin pre-treatment reverse night-light-induced neurobehavioural disruptions in a diurnal corvid
Darkness at midnight and evening melatonin may reverse the negative effects of night light on behavior in daytime-active crows.
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Abstract
Dim light at night (, 6 lx) reduced nocturnal melatonin levels and negatively impacted multiple neurobehavioural traits in Indian house crows.
- dLAN exposure disrupted circadian behavior, sleep, mood, and cognitive performance in the crows.
- The mRNA expression of genes linked to neurogenesis, neuroinflammation, and epigenetic regulation was altered in brain regions associated with these behaviours.
- A 2-hour dark period during dLAN partially restored some neurobehavioural functions.
- Pre-treatment with 50 µg of melatonin 30 minutes before dLAN onset completely restored disrupted behaviours and gene expressions.
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Key numbers
70%
Midnight Melatonin Level Increase
Melatonin levels elevated by a 2-hour midnight dark period under conditions.
100%
Cognitive Performance Recovery
Crows in the /melatonin group showed complete recovery in cognitive tests.
36
Sample Size
Total number of crows captured and studied in both experiments.