PubMed_ArguminSci  

PubMed:31679928 JSONTXT 6 Projects

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Id Subject Object Predicate Lexical cue
T1 98-234 DRI_Background denotes Nearly all organisms evolved endogenous self-sustained timekeeping mechanisms to track and anticipate cyclic changes in the environment.
T2 235-330 DRI_Background denotes Circadian clocks, with a periodicity of about 24 h, allow animals to adapt to day-night cycles.
T3 331-498 DRI_Background denotes Biological clocks are highly adaptive, but strong behavioral rhythms might be a disadvantage for adaptation to weakly rhythmic environments such as polar areas [1, 2].
T4 499-627 DRI_Background denotes Several high-latitude species, including Drosophila species, were found to be highly arrhythmic under constant conditions [3-6].
T5 628-738 DRI_Approach denotes Furthermore, Drosophila species from subarctic regions can extend evening activity until dusk under long days.
T6 739-932 DRI_Background denotes These traits depend on the clock network neurochemistry, and we previously proposed that high-latitude Drosophila species evolved specific clock adaptations to colonize polar regions [5, 7, 8].
T7 933-1120 DRI_Outcome denotes We broadened our analysis to 3 species of the Chymomyza genus, which diverged circa 5 million years before the Drosophila radiation [9] and colonized both low and high latitudes [10, 11].
T8 1121-1351 DRI_Background denotes C. costata, pararufithorax, and procnemis, independently of their latitude of origin, possess the clock neuronal network of low-latitude Drosophila species, and their locomotor activity does not track dusk under long photoperiods.
T9 1352-1497 DRI_Background denotes Nevertheless, the high-latitude C. costata becomes arrhythmic under constant darkness (DD), whereas the two low-latitude species remain rhythmic.
T10 1498-1810 DRI_Challenge denotes Different mechanisms are behind the arrhythmicity in DD of C. costata and the high-latitude Drosophila ezoana, suggesting that the ability to maintain behavioral rhythms has been lost more than once during drosophilids' evolution and that it might indeed be an evolutionary adaptation for life at high latitudes.