Introduction to “Red Tides” in the Northern Gulf of Mexico: Harmful Algae Blooms.

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Presentation transcript:

Introduction to “Red Tides” in the Northern Gulf of Mexico: Harmful Algae Blooms

“Red” Tides: Misnomers and Misinformation q Blooms of harmful algae do not always appear red in color; they can be brown, green, yellow, or colorless q Not all algal blooms are harmful q Not all harmful blooms result from high levels of nutrients (pollution)

Known Harmful Algal Bloom (HAB) Species Northern Gulf of Mexico Genus and speciesProblem(s) Alexandrium monilatumtoxic to fish and invertebrates Anabaena spp.toxicity (mammalian neurotoxins); low D.O. Ceratium furcapossible cause of DSP Ceratium hircuslow D.O. Dinophysis caudataDSP; tumor promoter Gonyaulax polygrammalow D.O. (fish and shellfish) Gymnodinium breveNSP (brevetoxin producer) Gymnodinium sanguineumassociated with fish kills Heterocapsa sp.low D.O. Heterosigma akashiwotoxic to fish Lingulodinium polyedrumtoxic (PSP?); limited food value for fish Oscillatoria erythraeatoxicity (neurotoxins); toxic to copepods Prorocentrum spp.DSP (okadaic acid producer) Pseudo-nitzschia spp.ASP (domoic acid producer)

The 34-foot research vessel Bill Demoran sits at the edge of a harmful algal bloom; “normal” water is off the bow of the boat

Sources of images: Sources of images: andhttp:// Red tides occur in places besides the Gulf of Mexico; this is a bloom of Noctiluca scintillans off of the California coast

This is a bloom of Cochlodinium in the Chesapeake Bay area Sources of images: Sources of images: and

Microscopic view of a water sample from a “red tide”

Oscilliatoria erythraea, a bluegreen alga, and a mixed phytoplankton sample containing cells of Karenia brevis, a dinoflagellate; these two species of algae were present in a 1996 algal bloom event in Mississippi Sound

Alexandrium monilatum and Ceratium furca, two harmful dinoflagellate species found in northern Gulf of Mexico waters Illustrated checklist of Skagerrak plankton

Dinophysis caudata and Prorocentrum micans, two other harmful dinoflagellate species from northern Gulf of Mexico waters that have been linked with diarrhetic shellfish poisoning (DSP), one of the “harms” associated with HAB events

A microscopic view of a mixed dinoflagellate bloom from Mississippi Sound

Chances for future blooms?