Tag Archives: seagrasses dying

Seagrasses? Algae? Who Wins?

The Crossroads off Sewall’s Point in the confluence of the St Lucie River and Indian River Lagoon. In 2019, seagrasses can be seen returning to an area that was post-2013, 2016, and 2018  a desert of sand. 8-3-19 photos by Scott Kuhns.

On August 3rd, I posted the above aerial noting the return of visible recovering seagrasses since the ACOE stopped discharging from Lake Okeechobee.

One of my readers wrote: “Most is not true seagrass, some algae’s, discolored sand. A little shoal grass here and there. It’s gonna take a few years of no discharges.”

And this is true. Seagrass is growing back, but right alongside, or even on the algae itself, is something else. A type of dark green, slimy-algae covering the grasses. I don’t remember it like this before…

We are living in a time of over-nitrification. Too much Phosphorus and Nitrogen drains off the land into the estuary feeding algae of all kinds as they compete for dominance.

And we decide who wins:

~A great video shared by my brother Todd covering the story of all types of algae and cyanobacteria.

 

8-3-19 Scott Kuhns what do you see?
8-3-19 Scott Kuhns looks back towards Stuart from St Lucie Inlet area. Area to right was once famous for its rich seagrass beds.

I have seen the microalgae growing back on our seagrasses in the SLR/IRL, and it has been here for years; it is just getting more dominant. I have not photographed as doing so requires a protected camera. Thus I am sharing these photos that in some ways resemble our beds.

Seagrass growing with microalgae: photo SeaGrant: https://seagrant.noaa.gov/News/Article/ArtMID/1660/ArticleID/357/Quantifying-Nitrogen-in-Shellfish-Helps-Planning-Efforts-on-Cape-Cod-
Example of seagrass and microalgae USGS public domain. https://www.usgs.gov/media/images/macroalgae-seagrass-and-litter-oh-my