this post was submitted on 26 Nov 2024
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Mammals have to breathe, so they are surfacing from time to time… so roughly they’ll know day from night.
Tides are mostly noticeable near land.
So you have deep sea creatures away from shore. They mostly won’t care about day and night as there’s no difference, with light not penetrating more that about 200 feet.
So below 200 feet, and away from shore you mostly can’t. But also it would not matter as there’s no difference
But if you were a human, in a submarine or a diving vessel where you needed to know, a clock or radio… would be about the options
Not all care, but it still impacts them.
Rhythms at the bottom of the deep sea: Cyclic current flow changes and melatonin patterns in two species of demersal fish
Beyond this, the diurnal cycle does filter down into the disphotic zone and does influence species. It does weaken with depth.
This sounds like a good way to keep track of time.
Oh hell yeah!
Neat thank you!!
And I learned a new word
Zeitgebers are external cues, such as light, that synchronize the circadian clock in organisms with the Earth's day-night cycles.