As someone who grew up in Miami and took many field trips to mangrove forests as a student I was unaware they weren’t indigenous to all of Florida.
The article doesn’t touch on this but there are 3 species of Florida mangroves. Red mangroves grow directly from salt water up to 3 ft deep. They also have spindly roots that trap sediment that builds up into soil. And after a storm colonies of them can break away and form floating mangrove islands. So not only do they migrate by germinating in new locations, they physically lift up and move.
The article doesn’t touch on this but there are 3 species of Florida mangroves. Red mangroves grow directly from salt water up to 3 ft deep. They also have spindly roots that trap sediment that builds up into soil. And after a storm colonies of them can break away and form floating mangrove islands. So not only do they migrate by germinating in new locations, they physically lift up and move.