Yes. I am a wetland biologist.
In a little over 20 years I've watched cabbage palm and live oak islands on the gulf coast of FL die off and turn into needlerush marsh. Some folks have been taking a closer look at these "Ghost forests" in recent years:
How Rising Seas Are Killing Southern U.S. Woodlands
I've monitored the same surficial water wells on the gulf coast for nearly 20 years, watching chloride levels (salinity) slowly keep going up. Surficial water is what's at the surface, and does not track the same as groundwater. Saltwater intrusion into groundwater is a whole other issue.
I've been in meetings with barrier island neighborhoods that are frantic because their stormwater retention ponds built 50 years ago no longer work during king tides, which are no longer an infrequent anomaly. This is a big problem, because you can't just dig coastal ponds deeper, and since many islands are built out, you can't make more ponds......
I've watched chunks of marsh disappear from the LA delta. And we're not just talking a few feet... I would set up marsh monitoring points around Terrebone Bay with a GPS only to come back a few months later to find nothing within a thousand yards in any direction.