Study on fitness of<i>Drosophila melanogaster</i>in different light regimes

Kouser, Shereen; Palaksha,; Shakunthala, V.

doi:10.1080/09291016.2013.817138

Cited by 11 publications

(3 citation statements)

References 31 publications

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“…Likewise, in larval and maturing pupal brains, a subset of central circadian clock neuron terminals are in close proximity to the PG neuron dendritic field, and recent studies have shown that PTTH helps coordinate the activity of the central brain clock with the peripheral clock found in the PG (Selcho et al, 2017). This circuit ensures circadian rhythmicity during pupal development, which both influences the timing of pupal development and the observed rhythmicity of adult eclosion that may aid in reproductive success (Kouser et al, 2013). PTTH signaling has also been shown to enhance larval light avoidance at the time of pupation via an E-independent mechanism (Yamanaka et al, 2013a).…”

Section: Discussion Ptth Signaling Is a Nexus For Coordinating Enviromentioning

confidence: 99%

Prothoracicotropic hormone modulates environmental adaptive plasticity through the control of developmental timing

et al. 2018

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Adult size and fitness are controlled by a combination of genetics and environmental cues. In , growth is confined to the larval phase and final body size is impacted by the duration of this phase, which is under neuroendocrine control. The neuropeptide prothoracicotropic hormone (PTTH) has been proposed to play a central role in controlling the length of the larval phase through regulation of ecdysone production, a steroid hormone that initiates larval molting and metamorphosis. Here, we test this by examining the consequences of null mutations in the gene for development. Loss of causes several developmental defects, including a delay in developmental timing, increase in critical weight, loss of coordination between body and imaginal disc growth, and reduced adult survival in suboptimal environmental conditions such as nutritional deprivation or high population density. These defects are caused by a decrease in ecdysone production associated with altered transcription of ecdysone biosynthetic genes. Therefore, the PTTH signal contributes to coordination between environmental cues and the developmental program to ensure individual fitness and survival.

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Section: Discussion Ptth Signaling Is a Nexus For Coordinating Enviromentioning

confidence: 99%

Prothoracicotropic hormone modulates environmental adaptive plasticity through the control of developmental timing

et al. 2018

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“…In fact, the first circadian clock genes were identified in the fruit fly ( Drosophila melanogaster ), and the fruit fly today remains a fundamental model organism for studying genetics, development, and disease (Bellen, Tong, & Tsuda, 2010; Konopka & Benzer, 1971). Constant bright light has been shown to negatively affect fecundity, longevity, and development of D. melanogaster (Kouser, Palaksha., & Shakunthala, 2013; Sheeba, Sharma, Chandrashekaran, & Joshi, 1999). These widespread effects have the potential to alter experimental results utilizing fruit flies.…”

Section: Considerations For Invertebratesmentioning

confidence: 99%

Effects of light at night on laboratory animals and research outcomes.

Emmer¹,

Russart²,

Walker³

et al. 2018

Behavioral Neuroscience

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Light has substantial influences on the physiology and behavior of most laboratory animals. As such, lighting conditions within animal rooms are potentially significant and often underappreciated variables within experiments. Disruption of the light/dark cycle, primarily by exposing animals to light at night (LAN), disturbs biological rhythms and has widespread physiological consequences because of mechanisms such as melatonin suppression, sympathetic stimulation, and altered circadian clock gene expression. Thus, attention to the lighting environment of laboratory animals and maintaining consistency of a light/dark cycle is imperative for study reproducibility. Light intensity, as well as wavelength, photoperiod, and timing, are all important variables. Although modern rodent facilities are designed to facilitate appropriate light cycling, there are simple ways to modify rooms to prevent extraneous light exposure during the dark period. Attention to lighting conditions of laboratory animals by both researchers and research care staff ensures best practices for maintaining animal welfare, as well as reproducibility of research results. (PsycINFO Database Record

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“…Comparatively, few studies have investigated whether fitness in invertebrates is impacted by exposure to dim nighttime lighting ( McLay et al, 2017 ). Previous studies have shown a negative effect of constant light exposure on fecundity and longevity in a model species ( Drosophila melanogaster ) relative to a normal day-night environment ( Kouser et al, 2014 ). Female D. melanogaster chronically exposed to light at night (light intensities of 1, 10 and 100 lx) were less likely to commence oviposition than females exposed to 0 lx light at night ( McLay et al, 2017 ).…”

Section: Introductionmentioning

confidence: 99%

Exposure to artificial light at night mediates the locomotion activity and oviposition capacity of Dastarcus helophoroides (Fairmaire)

Jiang

Ren²,

Hai³

et al. 2023

Front. Physiol.

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Light entrains the endogenous circadian clocks of organisms to synchronize their behavioral and physiological rhythms with the natural photoperiod. The presence of artificial light at night disrupts these photoperiodic cues and is currently considered to be a major threat to key fitness-related behaviors, including sleep disruption and physiological stress. Research on the ecological influence of forest pest and their natural enemies is lacking. The wood-boring insects significantly damage forest and urban forest ecosystem functions. The parasitic beetles, Dastarcus helophoroides is an important natural enemy of wood-boring insects, especially those in the Cerambycidae family. However, the effect of artificial light at night on the locomotor rhythms and oviposition capacity of D. helophoroides has received little attention. To address this gap, diel changes in the locomotor activity and number of eggs laid by female D. helophoroides was analyzed under different light-dark (LD) cycles and temperatures. The results showed that the 24-h rhythmic of locomotor activity in these beetles was elevated in darkness and reduced under illumination, indicating that they are nocturnal insects. This activity has two major peaks, the evening (1–8 h after lights off) and morning (3.5–12.5 h after lights off) components, reflecting that light mediate regular changes in locomotor activity. Moreover, the circadian rhythms and active percentage were influenced by the illumination duration and temperature, especially constant light and 40°C. Females laid more eggs under the 16 L: 8 D cycles at 30°C than under the other combinations of photoperiod (including constant light and darkness) and temperature. Finally, the potential influence of exposure to four ecologically relevant intensities of artificial light at night (0, 1, 10 or 100 lx) on oviposition capacity was studied. The results showed that lifetime exposure to bright artificial light (1–100 lx) at night decreased the number of eggs laid relative to those laid with no lighting at night. These results demonstrate that chronic exposure to bright artificial light at night may influence the locomotor activity and oviposition capacity of this parasitic beetle.

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Study on fitness ofDrosophila melanogasterin different light regimes

Cited by 11 publications

References 31 publications

Prothoracicotropic hormone modulates environmental adaptive plasticity through the control of developmental timing

Prothoracicotropic hormone modulates environmental adaptive plasticity through the control of developmental timing

Effects of light at night on laboratory animals and research outcomes.

Exposure to artificial light at night mediates the locomotion activity and oviposition capacity of Dastarcus helophoroides (Fairmaire)

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