Abstract
Moonlight is the strongest naturally and predictably occurring nocturnal light source. Thus, many species have adapted to use moonlight as a reliable timing cue, either by directly reacting to moonlight or by entraining inner oscillators, like the monthly circalunar clock.
Natural moonlight is characterized by intensity, spectrum, and complex timing, which regularly changes every night and across additional timescales. In order to understand the molecular and cellular machineries underlying moon-controlled physiology and behavior, lab experiments with organisms exhibiting well-documented lunar cycles are important. Tools such as TALEN- or Cas9/Crispr-engineered mutants or transgenesis are crucial to move from correlative studies to causal relationships. However, lab experiments face the problem that commonly used artificial light sources differ greatly from sun- and moonlight.
To start to overcome this limitation, we have developed naturalistic sun- and moonlight sources, which closely mimic the natural light environment.
We highlight the use of these naturalistic sun- and moonlight sources using the marine bristle worm Platynereis dumerilii, which controls its timing of reproduction with a circalunar clock. Importantly, while designed for Platynereis research, these methods can also be relatively easily adapted and used to study the effects of moonlight and/or monthly oscillator systems of other species. Finally, we provide an overview on statistical analyses of circalunar data sets.
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1 Electronic Supplementary Materials
Sexual metamorphosis of Platynereis dumerilii causes clear behavioral changes (female). The video shows a mature, yellow-colored female swimming in circles. In contrast, the immature/premature worms settle at the bottom and display crawling behavior (MOV 71165 kb)
Sexual metamorphosis of Platynereis dumerilii causes clear behavioral changes (male). The video shows a mature, red−/white-colored male swimming in the culture box. In contrast, the immature/premature worms settle at the bottom and display crawling behavior (MOV 34876 kb)
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Poehn, B., Tessmar-Raible, K. (2022). Assessment of Circalunar (~Monthly) Rhythms. In: Hirota, T., Hatori, M., Panda, S. (eds) Circadian Clocks. Neuromethods, vol 186. Humana, New York, NY. https://doi.org/10.1007/978-1-0716-2577-4_10
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DOI: https://doi.org/10.1007/978-1-0716-2577-4_10
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