Artificial light at night alters delayed-type hypersensitivity reaction in response to acute stress in Siberian hamsters

Bedrosian, Tracy A.; Aubrecht, Taryn G.; Kaugars, Katherine E.; Weil, Zachary M.; Nelson, Randy J.

doi:10.1016/j.bbi.2013.05.009

Cited by 21 publications

(13 citation statements)

References 14 publications

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“…Alternatively, if nighttime activity of the 5000K treatment birds continued to return to normal levels, as the pattern suggests, perhaps individuals can acclimate to nighttime light levels of 5000K lights under 0.3 lx. Again, there was no difference measured between 3000 K and control treatments, suggesting that zebra finches respond to the cool color temperature lights (emitting a higher proportion of short‐wavelength light), similar to studies on two different vertebrate taxa (Bedrosian et al., , ; Migaud, Cowan, Taylor, & Ferguson, ).…”

Section: Discussionsupporting

confidence: 80%

“…We found that the responses of nighttime activity and cort levels were dependent on the color temperature of the LED, whereby exposure to 5000 K LED night‐lights, but not 3000K or control treatments, increased nighttime activity and cort levels over a three week experimental period. Additionally, we used a low level of illuminance (0.3 lx) not much brighter than what animals may experience under a full moon (Rich & Longcore, ), as compared to previous studies (Bedrosian, Aubrecht, Kaugars, Weil, & Nelson, ; Burger, ; Raap et al., , b; Titulaer, Spoelstra, Lange, & Visser, ; Yorzinski et al., ).…”

Section: Discussionmentioning

confidence: 99%

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Light at night disrupts nocturnal rest and elevates glucocorticoids at cool color temperatures

et al. 2018

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Nighttime light pollution is quickly becoming a pervasive, global concern. Since the invention and proliferation of light-emitting diodes (LED), it has become common for consumers to select from a range of color temperatures of light with varying spectra. Yet, the biological impacts of these different spectra on organisms remain unclear. We tested if nighttime illumination of LEDs, at two commercially available color temperatures (3000 and 5000 K) and at ecologically relevant illumination levels affected body condition, food intake, locomotor activity, and glucocorticoid levels in zebra finches (Taeniopygia guttata). We found that individuals exposed to 5000 K light had higher rates of nighttime activity (peaking after 1 week of treatment) compared to 3000 K light and controls (no nighttime light). Birds in the 5000 K treatment group also had increased corticosterone levels from pretreatment levels compared to 3000 K and control groups but no changes in body condition or food intake. Individuals that were active during the night did not consequently decrease daytime activity. This study adds to the growing evidence that the spectrum of artificial light at night is important, and we advocate the use of nighttime lighting with warmer color temperatures of 3000 K instead of 5000 K to decrease energetic costs for avian taxa.

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Section: Discussionsupporting

confidence: 80%

Section: Discussionmentioning

confidence: 99%

Light at night disrupts nocturnal rest and elevates glucocorticoids at cool color temperatures

et al. 2018

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“…These effects are evident even at relatively low levels of ALAN (≤30 lx), typical of the light environment in some urban and peri‐urban spaces. Field studies demonstrate a negative relationship between the presence of dim ALAN (≤5 lx) and reproductive success and juvenile growth in birds (Dominoni, Goymann, Helm, & Partecke, ; Dominoni, Quetting, & Partecke, ; Raap et al., ) and reproduction in mammals (LeTallec, Thery, & Perret, ; Robert, Lesku, Partecke, & Chambers, ), whereas laboratory experiments in hamsters and rats link exposure to dim ALAN (between 1 and 5 lx) with increases in tumor growth rates (Blask, Dauchy, Brainard, & Hanifin, ) and immune suppression (Bedrosian, Aubrecht, Kaugars, Weil, & Nelson, ). Similar responses to chronic exposure to dim ALAN (between 10 and 30 lx) are observed in invertebrates.…”

Section: Introductionmentioning

confidence: 99%

Dim artificial light at night affects mating, reproductive output, and reactive oxygen species in Drosophila melanogaster

et al. 2018

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Humans are lighting the night-time environment with ever increasing extent and intensity, resulting in a variety of negative ecological effects in individuals and populations. Effects of light at night on reproductive fitness traits are demonstrated across taxa however, the mechanisms underlying these effects are largely untested. One possible mechanism is that light at night may result in perturbed reactive oxygen species (ROS) and oxidative stress levels. Here, we reared Drosophila melanogaster under either dim (10 lx) light or no light (0 lx) at night for three generations and then compared mating and lifetime oviposition patterns. In a second experiment, we explored whether exposure to light at night treatments resulted in variation in ROS levels in the heads and ovaries of six, 23- and 36-day-old females. We demonstrate that dim light at night affects mating and reproductive output: 10 lx flies courted for longer prior to mating, and female oviposition patterns differed to 0 lx females. ROS levels were lower in the ovaries but not heads, of 10 lx compared with 0 lx females. We suggest that reduced ROS levels may reflect changes in ovarian physiology and cell signaling, which may be related to the differences observed in oviposition patterns. Taken together, our results indicate negative consequences for invertebrates under more stressful, urban, lit conditions and further investigation into the mechanisms driving these changes is warranted to manage invertebrate communities in a brighter future.

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“…Although the benefit of artificial light at night to humans is clear, for many organisms, anthropogenic sources of night light have the potential to disrupt physiological processes that rely on the daily and seasonal rhythms of light cues, such as emergence time [2,3], foraging behaviour [4], communication [5,6] and the timing of reproduction [7][8][9][10]. Additionally, laboratory studies on rodents have shown that artificial light at night can drive other physiological processes that may have fitness and/or survival consequences, such as suppressed immune function, impaired stress responses [11,12] and reduced cognition [13]. However, current research on the effects of light at night in mammals consists of two distinct approaches with little integration: laboratory-based physiological studies and field-based behavioural observations [14].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2015

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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 tammar wallaby. 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.

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Artificial light at night alters delayed-type hypersensitivity reaction in response to acute stress in Siberian hamsters

Cited by 21 publications

References 14 publications

Light at night disrupts nocturnal rest and elevates glucocorticoids at cool color temperatures

Light at night disrupts nocturnal rest and elevates glucocorticoids at cool color temperatures

Dim artificial light at night affects mating, reproductive output, and reactive oxygen species in Drosophila melanogaster

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

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