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A damping circadian clock drives weak oscillations in metabolism and locomotor activity of aphids (Acyrthosiphon pisum)

Please always quote using this URN: urn:nbn:de:bvb:20-opus-170020
  • Timing seasonal events, like reproduction or diapause, is crucial for the survival of many species. Global change causes phenologies worldwide to shift, which requires a mechanistic explanation of seasonal time measurement. Day length (photoperiod) is a reliable indicator of winter arrival, but it remains unclear how exactly species measure day length. A reference for time of day could be provided by a circadian clock, by an hourglass clock, or, as some newer models suggest, by a damped circadian clock. However, damping of clock outputs has soTiming seasonal events, like reproduction or diapause, is crucial for the survival of many species. Global change causes phenologies worldwide to shift, which requires a mechanistic explanation of seasonal time measurement. Day length (photoperiod) is a reliable indicator of winter arrival, but it remains unclear how exactly species measure day length. A reference for time of day could be provided by a circadian clock, by an hourglass clock, or, as some newer models suggest, by a damped circadian clock. However, damping of clock outputs has so far been rarely observed. To study putative clock outputs of Acyrthosiphon pisum aphids, we raised individual nymphs on coloured artificial diet, and measured rhythms in metabolic activity in light-dark illumination cycles of 16:08 hours (LD) and constant conditions (DD). In addition, we kept individuals in a novel monitoring setup and measured locomotor activity. We found that A. pisum is day-active in LD, potentially with a bimodal distribution. In constant darkness rhythmicity of locomotor behaviour persisted in some individuals, but patterns were mostly complex with several predominant periods. Metabolic activity, on the other hand, damped quickly. A damped circadian clock, potentially driven by multiple oscillator populations, is the most likely explanation of our results.show moreshow less

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Metadaten
Author: Katharina Beer, Jens JoschinskiORCiD, Alazne Arrazola Sastre, Jochen Krauss, Charlotte Helfrich-FörsterORCiD
URN:urn:nbn:de:bvb:20-opus-170020
Document Type:Journal article
Faculties:Fakultät für Biologie / Theodor-Boveri-Institut für Biowissenschaften
Language:English
Parent Title (English):Scientific Reports
Year of Completion:2017
Volume:7
Issue:14906
Source:Scientific Reports 2017, 7:14906. DOI: 10.1038/s41598-017-15014-3
DOI:https://doi.org/10.1038/s41598-017-15014-3
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=29097765
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 57 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
Tag:Acyrthosiphon pisum; behavioural ecology; circadian mechanisms; damped circadian clock
Release Date:2019/09/18
Licence (German):License LogoCC BY: Creative-Commons-Lizenz: Namensnennung 4.0 International