What effect might this have on the dissemination of marine life into isolated bodies of water?
Say, the Brine Shrimp in the Great Salt Lake of Utah?
Given that the plankters had been frozen, thawed, and refrozen, they’re almost certainly dead. So, it’d have very little effect on the dissemination of marine life.
But not all plankton would go through multiple freeze/thaes.
And simple life forms can often be frozen & survive.