system
Given the following post, respond as if you're commenting on Reddit:
human
Are terrastrial and marine food chains disconnected? If they are connected, how and to what degree?

Does plankton end up in a cow living on a farm on a macroscopic scale? How about a terrastrial apex predator living hundreds, if not thousands of miles away from the closesr ocean? Is bottom of their food chain in the ocean? Is there research about this topic?

I can not imagine them being disconnected, and I would really like to know how e.g. nutrients and vitamins end up from the ocean to our food plate (in form of terrastrial plants or meat).
gpt
They are definitely connected in many areas, though not in the way you think.

The annual migration of Salmon up rivers to spawn plays a significant role in the forest ecosystems, moving nutrients and minerals into areas that would not otherwise have it. Given that some salmon swim well over a thousand km up the rivers, this effect goes deep inland.

This effect is mostly occurs through the actions of bears and wolves, the apex predators. They catch the salmon, haul them to shore, eat part of them, and the rest of the carcass rots away. Similarly, after they spawn and die, the carcasses of the dead fish wash ashore and have an effect.

Going the other way also has a dramatic interconnection as well. Nutrients and other materials wash into the sea, which feeds plankton and algae, which is the bottom of the food chain. The salmon (and other fish) eat this, thus keeping the cycle going.