3 ms·
What is even more interesting is why exactly do they "sleep" at night? Do they have some sort of circadian rhythm? They are filter feeders, so the time of the d
by cetalingua 9y ago
What is even more interesting is why exactly do they "sleep" at night? Do they have some sort of circadian rhythm? They are filter feeders, so the time of the day should not be that important, after all they can filter feed at night? Maybe it is a byproduct of being in lab? Since they are fed during the daytime, they might have "adjusted" to the lab schedule? They need light though, for their photosynthesizing symbionts.
- Someone 9y agoThey (http://travelnq.com/australian-box-jellyfish/ http://travelnq.com/australian-box-jellyfish/) or their food (https://www.nature.com/scitable/blog/saltwater-science/what_makes_plankton_migrate https://www.nature.com/scitable/blog/saltwater-science/what_...) might move vertically between day and night, with the jellyfish being unable to follow their food on part of their depth range. For example, jellyfish might get sunburn at low depths. (Aside: that first link, from 2014, already states that box jellyfish sleep, so this doesn’t seem to be as new as this article claims it to be. What (I guesstimate) is new is that they did pharmacological work to show that the jellyfish didn’t simply ‘not move’)