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Sleep in Populations of Drosophila Melanogaster (1,2,3).

Liu C, Haynes PR, Donelson NC, Aharon S, Griffith LC - eNeuro (2015)

Bottom Line: Social interactions between pairs of flies have been shown to affect locomotor activity patterns, but effects on locomotion and sleep patterns have not been assessed for larger populations.Surprisingly, we find that same-sex populations of flies synchronize their sleep/wake activity, resulting in a population sleep pattern, which is similar but not identical to that of isolated individuals.These data support the idea that it is possible to investigate neural mechanisms underlying the effects of population behaviors on sleep by directly looking at a large number of animals in laboratory conditions.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Biology, National Center for Behavioral Genomics and Volen Center for Complex Systems, Brandeis University , Waltham, Massachusetts 02454-9110.

ABSTRACT
The fruit fly Drosophila melanogaster is a diurnal insect active during the day with consolidated sleep at night. Social interactions between pairs of flies have been shown to affect locomotor activity patterns, but effects on locomotion and sleep patterns have not been assessed for larger populations. Here, we use a commercially available locomotor activity monitor (LAM25H) system to record and analyze sleep behavior. Surprisingly, we find that same-sex populations of flies synchronize their sleep/wake activity, resulting in a population sleep pattern, which is similar but not identical to that of isolated individuals. Like individual flies, groups of flies show circadian and homeostatic regulation of sleep, as well as sexual dimorphism in sleep pattern and sensitivity to starvation and a known sleep-disrupting mutation (amnesiac). Populations of flies, however, exhibit distinct sleep characteristics from individuals. Differences in sleep appear to be due to olfaction-dependent social interactions and change with population size and sex ratio. These data support the idea that it is possible to investigate neural mechanisms underlying the effects of population behaviors on sleep by directly looking at a large number of animals in laboratory conditions.

No MeSH data available.


Related in: MedlinePlus

Populations of flies sleep better with complete food. Sleep profiles for populations of females (A) and males (B) on different food. C, Quantification of total sleep. Both female and male populations of flies slept significantly longer when on standard fly food compared with sucrose during the day, but there was no statistically significant difference during the night. D, Activity while awake. Complete food significantly increased activity levels during daytime wake periods in males, and at night in females. E, Number of sleep episodes. F, Sleep bout length. Females, but not males, had significantly consolidated sleep at night, i.e., fewer but longer sleep episodes. G, Latency. Females fell asleep faster on the complete food than on the sucrose agar food, whereas males exhibited similar latency on both food media. n = 8 groups for all conditions. ZT, Zeitgeber time; F, female; M, male.
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Figure 6: Populations of flies sleep better with complete food. Sleep profiles for populations of females (A) and males (B) on different food. C, Quantification of total sleep. Both female and male populations of flies slept significantly longer when on standard fly food compared with sucrose during the day, but there was no statistically significant difference during the night. D, Activity while awake. Complete food significantly increased activity levels during daytime wake periods in males, and at night in females. E, Number of sleep episodes. F, Sleep bout length. Females, but not males, had significantly consolidated sleep at night, i.e., fewer but longer sleep episodes. G, Latency. Females fell asleep faster on the complete food than on the sucrose agar food, whereas males exhibited similar latency on both food media. n = 8 groups for all conditions. ZT, Zeitgeber time; F, female; M, male.

Mentions: Two-way ANOVA


Sleep in Populations of Drosophila Melanogaster (1,2,3).

Liu C, Haynes PR, Donelson NC, Aharon S, Griffith LC - eNeuro (2015)

Populations of flies sleep better with complete food. Sleep profiles for populations of females (A) and males (B) on different food. C, Quantification of total sleep. Both female and male populations of flies slept significantly longer when on standard fly food compared with sucrose during the day, but there was no statistically significant difference during the night. D, Activity while awake. Complete food significantly increased activity levels during daytime wake periods in males, and at night in females. E, Number of sleep episodes. F, Sleep bout length. Females, but not males, had significantly consolidated sleep at night, i.e., fewer but longer sleep episodes. G, Latency. Females fell asleep faster on the complete food than on the sucrose agar food, whereas males exhibited similar latency on both food media. n = 8 groups for all conditions. ZT, Zeitgeber time; F, female; M, male.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4596024&req=5

Figure 6: Populations of flies sleep better with complete food. Sleep profiles for populations of females (A) and males (B) on different food. C, Quantification of total sleep. Both female and male populations of flies slept significantly longer when on standard fly food compared with sucrose during the day, but there was no statistically significant difference during the night. D, Activity while awake. Complete food significantly increased activity levels during daytime wake periods in males, and at night in females. E, Number of sleep episodes. F, Sleep bout length. Females, but not males, had significantly consolidated sleep at night, i.e., fewer but longer sleep episodes. G, Latency. Females fell asleep faster on the complete food than on the sucrose agar food, whereas males exhibited similar latency on both food media. n = 8 groups for all conditions. ZT, Zeitgeber time; F, female; M, male.
Mentions: Two-way ANOVA

Bottom Line: Social interactions between pairs of flies have been shown to affect locomotor activity patterns, but effects on locomotion and sleep patterns have not been assessed for larger populations.Surprisingly, we find that same-sex populations of flies synchronize their sleep/wake activity, resulting in a population sleep pattern, which is similar but not identical to that of isolated individuals.These data support the idea that it is possible to investigate neural mechanisms underlying the effects of population behaviors on sleep by directly looking at a large number of animals in laboratory conditions.

View Article: PubMed Central - HTML - PubMed

Affiliation: Department of Biology, National Center for Behavioral Genomics and Volen Center for Complex Systems, Brandeis University , Waltham, Massachusetts 02454-9110.

ABSTRACT
The fruit fly Drosophila melanogaster is a diurnal insect active during the day with consolidated sleep at night. Social interactions between pairs of flies have been shown to affect locomotor activity patterns, but effects on locomotion and sleep patterns have not been assessed for larger populations. Here, we use a commercially available locomotor activity monitor (LAM25H) system to record and analyze sleep behavior. Surprisingly, we find that same-sex populations of flies synchronize their sleep/wake activity, resulting in a population sleep pattern, which is similar but not identical to that of isolated individuals. Like individual flies, groups of flies show circadian and homeostatic regulation of sleep, as well as sexual dimorphism in sleep pattern and sensitivity to starvation and a known sleep-disrupting mutation (amnesiac). Populations of flies, however, exhibit distinct sleep characteristics from individuals. Differences in sleep appear to be due to olfaction-dependent social interactions and change with population size and sex ratio. These data support the idea that it is possible to investigate neural mechanisms underlying the effects of population behaviors on sleep by directly looking at a large number of animals in laboratory conditions.

No MeSH data available.


Related in: MedlinePlus