BIOL 4310 Lecture 20: March 26 Circadian Rhythms in Polar Regions
8 Apr 2020
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Lecture 20 march 26 circadian rhythms in polar regions. Polar region = frigid zones or north + south poles, considered the geographical region above. Seasonal tilt of the earth causes days of constant light and days of constant darkness. Polar day is also called midnight sun because the sun will get lower at midnight but it will not pass the horizon (sun will not set) Circadian rhythms= rhythms that occur in 24h time periods and are generally physical, mental, and behavioural changes that occur in a variety of living things: controlled by endogenous clocks that are usually entrained to the light/dark cycle. They are driven by transcriptional and translational feedback loops. Articles study the circadian rhythms of polar vertebrates, and they explore the diel rhythms (or daily rhythms) and their necessary adjustments to these rhythms for adaptations and the most beneficial physiological responses in polar regions. Articles show quantitative measurements of polar vertebrates behaviour, temperature, and heart rate.
