Developmental effects of constant light on circadian behaviour and gene expressions in zebra finches: Insights into mechanisms of metabolic adaptation to aperiodic environment in diurnal animals

Prabhat, Abhilash; Malik, Indu; Jha, Neelu Anand; Bhardwaj, Sanjay Kumar; Kumar, Vinod

doi:10.1016/j.jphotobiol.2020.111995

Cited by 12 publications

(8 citation statements)

References 56 publications

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“…Artificial light at night have shown to affect the foraging behavior in urban areas in feral pigeons as they extend the feeding and activity behavior after sunset [41]. The presence of light at night was the only variable changed between LD and dLAN groups, and effects on activity and feeding behavior and clock gene expression has been observed under constant light and dim light at night conditions in zebra finches [17,21]. However, we cannot discount the effects of other factors as we have not carried out any molecular analysis.…”

Section: Discussionmentioning

confidence: 99%

“…Specifically, increased light at night disrupted daily rhythm with loss of nocturnal peak in melatonin secretion in the Indian weaver bird (Ploceus philippinus; [15]), great tits (Parus major; [8][9][10][11][12][13][14]16]), Indian house crows (Corvus splendens; [14]) and female zebra finches (Taeniopygia guttata; [17,18]). Bright light at night (constant light) and removal of pineal gland exposure decayed daily rhythms in singing and activity behaviors in zebra finches [13,[19][20][21] and alters the perception of day length and affects the underlying physiology in Indian Weaver bird [22]. The light at night induces "eating at a wrong time" in both mammals and birds.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Night Illumination on Behavior, Body Mass and Learning in Male Zebra Finches

Prabhat

Kumar

et al. 2021

Birds

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An increase in artificial night lighting has blurred the boundaries of day and night and transformed the natural day-night environment with alteration in the temporal niche of the animals. Male zebra finches were exposed to a dim light at night (dLAN) protocol (Light: dLAN, 12L = 200 lux: 12dLAN = 5 lux) with controls on darkness at night (Light: dark, 12L = 200 lux: 12D = 0 lux) for six weeks. We assayed sleep-wake, daily behaviors, mood, and cognition, as well as changes in physiological parameters. Dim light at night increased sleep frequency, delayed sleep onset, advanced awakening latency, and caused a reduction in total sleep duration. dLAN birds did not associate (physical association) with novel object and birds spent significantly lesser time on perch with novel object as compared to LD. In colour learning task, night illuminated birds took more time to learn and made more error, compared to LD. dLAN significantly altered the 24-h daily behavioral rhythm (amplitude and acrophase) of feeding, drinking, preening, and perch-hopping behavior. In particular, birds extended their feeding hours in the nighttime under dLAN, with no difference in total food intake. Birds under dLAN increased fattening and hence significantly increased body mass. Our results show that dim light at night altered feeding rhythm, caused decrease in sleep behavior, and negatively affected learning and memory performance in male zebra finches.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Night Illumination on Behavior, Body Mass and Learning in Male Zebra Finches

Prabhat

Kumar

et al. 2021

Birds

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“…Additionally, an LL-induced decrease in neurogenesis and dendritic complexity of the new-born neurons in the hippocampus and caudal nidopallium has also been shown in House Crows [36]. Similarly, a behavioural experiment on aviary-bred Zebra Finches exposed to LL demonstrated it had detrimental effects on activity and signing rhythms [19,27,28]. In addition, LL induced a decline in advanced brain functions such as learning and personality traits in Zebra Finches (Taeniopygia guttata) in adults, and in future generations as well [19].…”

Section: Adverse Effects On Cognitive Functionsmentioning

confidence: 91%

“…Additionally, there was loss of rhythmic expression of clock genes in the hypothalamus and song nuclei under LL [27]. Similarly, female Zebra Finches born under LL showed loss of rhythmic expression of clock genes in the hypothalamus and peripheral tissues [28]. Further, dLAN affects the expression of bmal1 in brain, liver, spleen, and blood tissues in Great Tits, along with alteration in metabolic and immune genes [25].…”

Section: Artificial Light At Night-circadian Misalignment and Sleep D...mentioning

confidence: 99%

“…Further, exogenous melatonin also promotes dendritic maturation and axonogenesis in the hippocampus of mice [60]. There have been reports demonstrating dLAN conditions suppress melatonin and affect neurogenesis in diurnal birds [15,28,39,40]. Plasma melatonin levels have also been shown to be lower in Tree Sparrows from urban environments, compared to rural birds.…”

Section: Melatonin Induced Modulation Of Neuroplasticitymentioning

confidence: 99%

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Artificial Light at Night, Higher Brain Functions and Associated Neuronal Changes: An Avian Perspective

Taufique

2022

Birds

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In recent times, there has been an unprecedented increase in usage of electrical lightning. This has led to increase in artificial light at night (ALAN), and it has been suggested as a source of environmental pollution. ALAN exposure has been reported to be associated with disruption of daily rhythms and serious health consequences, such as immune, metabolic, and cognitive dysfunctions in both birds and mammals. Given the worldwide pervasiveness of ALAN, this research topic is also important from an ecological perspective. In birds, daily timings and appropriate temporal niches are important for fitness and survival. Daily rhythms in a wide array of functions are regulated by the circadian clock(s) and endogenous oscillators present in the body. There is accumulating evidence that exposure to ALAN disrupts clock-regulated daily rhythms and suppresses melatonin and sleep in birds. Circadian clock, melatonin, and sleep regulate avian cognitive performance. However, there is limited research on this topic, and most of the insights on the adverse effects of ALAN on cognitive functions are from behavioural studies. Nevertheless, these results raise an intriguing question about the molecular underpinning of the ALAN-induced negative consequences on brain functions. Further research should be focused on the molecular links between ALAN and cognitive performance, including the role of melatonin, which could shed light on the mechanism by which ALAN exposures lead to negative consequences.

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Artificial night illumination disrupts sleep, and attenuates mood and learning in diurnal animals: evidence from behavior and gene expression studies in zebra finches

Kumar

Prabhat

Kumar

et al. 2023

Photochem Photobiol Sci

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Developmental effects of constant light on circadian behaviour and gene expressions in zebra finches: Insights into mechanisms of metabolic adaptation to aperiodic environment in diurnal animals

Cited by 12 publications

References 56 publications

Effects of Night Illumination on Behavior, Body Mass and Learning in Male Zebra Finches

Effects of Night Illumination on Behavior, Body Mass and Learning in Male Zebra Finches

Artificial Light at Night, Higher Brain Functions and Associated Neuronal Changes: An Avian Perspective

Artificial night illumination disrupts sleep, and attenuates mood and learning in diurnal animals: evidence from behavior and gene expression studies in zebra finches

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