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2015 ; 5
(ä): 13557
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Light pollution disrupts sleep in free-living animals
#MMPMID26337732
Raap T
; Pinxten R
; Eens M
Sci Rep
2015[Sep]; 5
(ä): 13557
PMID26337732
show ga
Artificial lighting can alter individual behaviour, with often drastic and
potentially negative effects on biological rhythms, daily activity and
reproduction. Whether this is caused by a disruption of sleep, an important
widespread behaviour enabling animals to recover from daily stress, is unclear.
We tested the hypothesis that light pollution disrupts sleep by recording
individual sleep behaviour of great tits, Parus major, that were roosting in dark
nest-boxes and were exposed to light-emitting diode light the following night.
Their behaviour was compared to that of control birds sleeping in dark nest-boxes
on both nights. Artificial lighting caused experimental birds to wake up earlier,
sleep less (-5%) and spent less time in the nest-box as they left their nest-box
earlier in the morning. Experimental birds did not enter the nest-box or fall
asleep later than controls. Although individuals in lit nest-boxes did not wake
up more often nor decreased the length of their sleep bouts, females spent a
greater proportion of the night awake. Our study provides the first direct proof
that light pollution has a significant impact on sleep in free-living animals, in
particular in the morning, and highlights a mechanism for potential effects of
light pollution on fitness.
|Animals
[MESH]
|Behavior, Animal/radiation effects
[MESH]
|Birds
[MESH]
|Dose-Response Relationship, Radiation
[MESH]
|Light/*adverse effects
[MESH]
|Lighting/*adverse effects
[MESH]
|Radiation Dosage
[MESH]
|Radiation Exposure/*adverse effects
[MESH]
|Sleep Wake Disorders/*etiology/*physiopathology
[MESH]