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Phenotypic coupling of sleep and starvation resistance evolves in D. melanogaster.

Abstract：

BACKGROUND:One hypothesis for the function of sleep is that it serves as a mechanism to conserve energy. Recent studies have suggested that increased sleep can be an adaptive mechanism to improve survival under food deprivation in Drosophila melanogaster. To test the generality of this hypothesis, we compared sleep and its plastic response to starvation in a temperate and tropical population of Drosophila melanogaster. RESULTS:We found that flies from the temperate population were more starvation resistant, and hypothesized that they would engage in behaviors that are considered to conserve energy, including increased sleep and reduced movement. Surprisingly, temperate flies slept less and moved more when they were awake compared to tropical flies, both under fed and starved conditions, therefore sleep did not correlate with population-level differences in starvation resistance. In contrast, total sleep and percent change in sleep when starved were strongly positively correlated with starvation resistance within the tropical population, but not within the temperate population. Thus, we observe unexpectedly complex relationships between starvation and sleep that vary both within and across populations. These observations falsify the simple hypothesis of a straightforward relationship between sleep and energy conservation. We also tested the hypothesis that starvation is correlated with metabolic phenotypes by investigating stored lipid and carbohydrate levels, and found that stored metabolites partially contributed towards variation starvation resistance. CONCLUSIONS:Our findings demonstrate that the function of sleep under starvation can rapidly evolve on short timescales and raise new questions about the physiological correlates of sleep and the extent to which variation in sleep is shaped by natural selection.

journal_name

BMC Evol Biol

journal_title

BMC evolutionary biology

authors

Sarikaya DP,Cridland J,Tarakji A,Sheehy H,Davis S,Kochummen A,Hatmaker R,Khan N,Chiu J,Begun DJ

doi

10.1186/s12862-020-01691-8

subject

Has Abstract

pub_date

2020-09-22 00:00:00

pages

126

issue

1

issn

1471-2148

pii

10.1186/s12862-020-01691-8

journal_volume

20

pub_type

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