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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 exhibit sleep patterns distinct from individual flies. A, Individual fly sleep for males and females. B, Sleep in populations of males and females. C, Quantification of total sleep from A and B. Individual males slept more than females. In populations males slept longer during the day, but less at night. D, Activity levels during wake periods. Males had more beam breaks than females in populations. E, Number of sleep episodes. Individual females had more sleep episodes than males, but populations were indistinguishable. F, Mean episode length. Females had shorter episodes than individual males, but no significant difference was detected in populations. G, Sleep Latency. Individual male flies took shorter time to fall asleep after light transitions than individual female flies, but no significant difference was found between populations of males and females. n = 32 for individuals and n = 8 groups for populations. Statistically similar groups are marked by the same letter, with different letters indicating significant differences between groups. F, female; M, male; ZT, Zeitgeber time.
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Figure 2: Populations of flies exhibit sleep patterns distinct from individual flies. A, Individual fly sleep for males and females. B, Sleep in populations of males and females. C, Quantification of total sleep from A and B. Individual males slept more than females. In populations males slept longer during the day, but less at night. D, Activity levels during wake periods. Males had more beam breaks than females in populations. E, Number of sleep episodes. Individual females had more sleep episodes than males, but populations were indistinguishable. F, Mean episode length. Females had shorter episodes than individual males, but no significant difference was detected in populations. G, Sleep Latency. Individual male flies took shorter time to fall asleep after light transitions than individual female flies, but no significant difference was found between populations of males and females. n = 32 for individuals and n = 8 groups for populations. Statistically similar groups are marked by the same letter, with different letters indicating significant differences between groups. F, female; M, male; ZT, Zeitgeber time.

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 exhibit sleep patterns distinct from individual flies. A, Individual fly sleep for males and females. B, Sleep in populations of males and females. C, Quantification of total sleep from A and B. Individual males slept more than females. In populations males slept longer during the day, but less at night. D, Activity levels during wake periods. Males had more beam breaks than females in populations. E, Number of sleep episodes. Individual females had more sleep episodes than males, but populations were indistinguishable. F, Mean episode length. Females had shorter episodes than individual males, but no significant difference was detected in populations. G, Sleep Latency. Individual male flies took shorter time to fall asleep after light transitions than individual female flies, but no significant difference was found between populations of males and females. n = 32 for individuals and n = 8 groups for populations. Statistically similar groups are marked by the same letter, with different letters indicating significant differences between groups. F, female; M, male; ZT, Zeitgeber time.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Figure 2: Populations of flies exhibit sleep patterns distinct from individual flies. A, Individual fly sleep for males and females. B, Sleep in populations of males and females. C, Quantification of total sleep from A and B. Individual males slept more than females. In populations males slept longer during the day, but less at night. D, Activity levels during wake periods. Males had more beam breaks than females in populations. E, Number of sleep episodes. Individual females had more sleep episodes than males, but populations were indistinguishable. F, Mean episode length. Females had shorter episodes than individual males, but no significant difference was detected in populations. G, Sleep Latency. Individual male flies took shorter time to fall asleep after light transitions than individual female flies, but no significant difference was found between populations of males and females. n = 32 for individuals and n = 8 groups for populations. Statistically similar groups are marked by the same letter, with different letters indicating significant differences between groups. F, female; M, male; ZT, Zeitgeber time.
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