title: Circadian clock properties of fruit flies Drosophila melanogaster exhibiting early and late emergence chronotypes.
abstract: The role of circadian clocks in timing daily behaviors is widely acknowledged, and while empirical evidence suggests that clock period is correlated with the preferred phase of a rhythmic behavior (chronotype), other clock properties have also been hypothesized to underlie chronotype variation. Here, we report that fruit fly Drosophila melanogaster populations exhibiting evening emergence chronotype (late) are characterized by higher incidence of behavioral arrhythmicity in constant dim light, wider range of entrainment, reduced rates of re-entrainment to simulated jet-lag and higher amplitude of both entrained and free-running rhythms as compared to those exhibiting morning emergence chronotype (early). Our results thus highlight the role of circadian clock properties such as zeitgeber sensitivity, amplitude and coupling in driving chronotype variation.
authors.affiliation: a Chronobiology Laboratory, Evolutionary and Organismal Biology Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore , Karnataka , India.
authors.forename: K L
authors.initials: KL
authors.lastname: Nikhil
authors.affiliation: a Chronobiology Laboratory, Evolutionary and Organismal Biology Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore , Karnataka , India.
authors.forename: Koustubh M
authors.initials: KM
authors.lastname: Vaze
authors.affiliation: a Chronobiology Laboratory, Evolutionary and Organismal Biology Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore , Karnataka , India.
authors.forename: Karatgi
authors.initials: K
authors.lastname: Ratna
authors.affiliation: a Chronobiology Laboratory, Evolutionary and Organismal Biology Unit , Jawaharlal Nehru Centre for Advanced Scientific Research , Bangalore , Karnataka , India.
authors.forename: Vijay Kumar
authors.initials: VK
authors.lastname: Sharma
mesh_terms: D000818:Animals; D001522:Behavior, Animal; D057906:Circadian Clocks; D002940:Circadian Rhythm; D004331:Drosophila melanogaster / Q000502:physiology*; D020179:Jet Lag Syndrome; D008027:Light; D008297:Male; D017440:Photoperiod
keywords: Amplitude; chronotype; circadian; coupling; emergence; evolution; oscillator