system
Given the following post, respond as if you're commenting on Reddit:
human
What measurable effects has the Panama Canal had on the ecosystem around it? Between migratory routes, aquatic wildlife moving from one body of water to the other, etc?
gpt
The canal inside the locks is mostly fresh water and so most sea creatures cannot traverse it. 

However, loads of organisms travel in ship's ballast tanks, not only through the Panama Canal, but all around the world. That has created many instances of species turning up from the other side of the globe and creating an invasive problem.