An interesting example of natural selection. If these organisms were humans, someone would be asking “Has evolution stopped for these jellyfish, I mean, humans?” And the answer is no.
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Links to books and other items on this page and elsewhere on Greg Ladens' blog may send you to Amazon, where I am a registered affiliate. As an Amazon Associate I earn from qualifying purchases, which helps to fund this site.
Does that make that a saltwater lake, or fresh water Jellies?
I’m pretty sure these lakey-pondy things are pot holes in karstic terrain where there is a lot of communication between the ‘lake’ and the sea. They may even be a little tidal, if there is much of a tide here.
If you factor together a) the distance from the c, b) the amount of water movement (communication) with the sea, and c) the freshwater influx from ground water, you’ll get some outcome as to how saline the water is. I imagine this is essentially salt water.
We have a similar jellyfish lake (or lagoon, since it’s not cut off from the sea completely) at Kaob on Siargao Island, Philippines. The water is fairly brackish and weakly tidal, and the landscpe is karstic limestone.I haven’t yet tested the strength of their stingers.