Ocean research peeps, especially any of you who study animal movement, I've got a question for you. I've got data from the Labrador Sea in Nov/Dec that appears to show lots of swimming creatures(?) that comes upwards in the water column (from below 15m to about 10m) when it's daylight and disappear back down at night. It's definitely correlated with light (not there on completely overcast days), and it's definitely movement (ADCP scattering that's not at the bulk water velocity). What's weird is that it seems to come up during the day. Has anyone got any idea what that might be?
I'm seriously wondering whether it's because herring sleep at night and swim during the day. Is that at all reasonable?
@helenczerski There are a lot of plankton species that ascend in the water column during the night and descend during the day – the exact opposite. I too would like to know what did you observe that does the opposite.
@helenczerski
Diel vertical migration, plenty of possible candidates.
@helenczerski Wow wild! Seems anti-correlated to typical migration.
Not my area of expertise at all. But maybe some of the people studying typical behavior would know. There is a big project at WHOI studying twiight zone migration (Specific researcher names in field notes sections.)
Link: https://twilightzone.whoi.edu/explore-the-otz/migration/
Edited 50d ago
@helenczerski it sounds like you should talk to the Greenland natural resources institute - I can put you in touch if you need a contact!