About a week and a half ago, my mother sent me an email with photos of my father and her on a kayak trip at night in the Indian River Lagoon. She had seen an article in the Stuart News about a company called Motorized Kayaks of the Treasure Coast and their trip into the light show of bioluminescence that has been occurring off our shores.
First, I thought about how cool my parents are to be going on kayak trips in their mid- seventies, and second, I thought, “aren’t these little plankton creatures a kind of algae bloom, and aren’t algae blooms bad for the lagoon in spite of bioluminescence’s beauty?”
Algae blooms have been linked to recent 60% plus seagrass die-offs, poor water quality, as well as IRL pelican, dolphin and manatee deaths. Super blooms, brown tides, “regular” and “toxic” algae blooms are “fed” by fertilizer, septic effluent, canal and Lake Okeechobee discharges, especially in the southern lagoon.
Well anyway, I decided to contact Dr. Edie Widder of ORCA, the Ocean Research and Conservation Association, in Ft. Pierce, (http://www.teamorca.org/cfiles/home.cfm) and ask.
Dr Widder is a world-renowned bioluminescence expert; she has even worked with the US Navy in the “design” of ships that would not cause bioluminescent disruption in the oceans, and thus give away their location to enemy ships.
This was my question to Dr Widder:
My parents rented kayaks to go see the bioluminescence in the IRL. It got me
thinking. Is the light caused by the same creatures that cause toxic algae
blooms in the lagoon?
Is the bioluminescence a bad sign for the health of the lagoon? Thank you.
Hope all is well.
Hi Jacqui – It’s kind of a good news bad news story. The dinoflagellate
producing the light show, Pyrodinium bahamense, happens to be one that
produces saxitoxin. Interestingly it’s the same dino that’s responsible for
the bioluminescent bays in Puerto Rico and in those bays it doesn’t produce
the saxitoxin. Here it does. It’s not known why although I have a theory
and it has nothing to do with pollution. (It’s a long story having to do
with how their bioluminescence functions to protect them from predators
under different concentrations.)
Dino blooms are usually preceded by rain events that flush nutrients into
the water and then a series of calm sunny days that promote photosynthesis.
Blooms like the one we’re seeing now used to be routine according to some of
the older fishermen I’ve talked to. They called it fire in the water. The
fact is the water can’t be too polluted or the dinoflagellates won’t grow.
I’ll send you an article with some pictures I took.
Here is a photo Dr Widder took of bioluminescence in the lagoon I copied and a link to a remarkable video.
Incredible pictures of barnacles feeding on bioluminescent dinoflagellates: (https://www.youtube.com/watch?v=y1jG8qFZyYY)
Thank you for sharing, Dr Widder!
In conclusion, I looked up saxitoxin and learned it is a “paralytic shellfish toxin” that is found is some shellfish and especially puffer fish. It has been found in few other places in the US as well as in the Indian River Lagoon. I guess the little dinoflagellates, the same ones that make the pretty bioluminescence light, not always, but sometimes, will produce this toxin which gets spread to some shellfish and some fish. If such a shellfish or fish is ingested, it will make a human very sick. Around 2002, 28 people got so sick here, in the Merritt Island area, and in a few other areas of the county, that now there is a permanent government ban on harvesting/eating IRL puffer fish in the entire IRL.
Since I am nowhere close to a scientist, I will just share some links below and refrain from speculating what is “good or bad. ” Nonetheless, I think I can safely say that sometimes beauty and danger walk hand in hand in this magical world of our Indian River Lagoon.
Abstract, Saxitoxin in the IRL, US Food and Drug Administration: (http://www.researchgate.net/publication/250019725_Concentrations_of_Saxitoxin_and_Tetrodotoxin_in_Three_Species_of_Puffers_from_the_Indian_River_Lagoon_Florida_the_Location_for_Multiple_Cases_of_Saxitoxin_Puffer_Poisoning_from_2002_to_2004Sincerely)
Monitoring Toxic Algae and Shellfish in the IRL, FWC, (http://myfwc.com/research/redtide/monitoring/current/indian-river/)
Florida Today: Is the IRL OK for Play? http://www.floridatoday.com/story/news/local/environment/2014/06/14/indian-river-lagoon-ok-play/10527607/)