Study of Saxitoxin Levels in Alexandrium spp. from Sequim Bay
Author Information
Author(s): Kathi A. Lefebvre, Brian D. Bill, Aleta Erickson, Keri A. Baugh, Lohna O’Rourke, Pedro R. Costa, Shelly Nance, Vera L. Trainer
Primary Institution: NOAA Fisheries, Northwest Fisheries Science Center
Hypothesis
What are the levels of intracellular and extracellular saxitoxin in Alexandrium spp. during harmful algal blooms?
Conclusion
The study confirmed that both intracellular and extracellular saxitoxin levels are present in Alexandrium spp. during blooms in Sequim Bay.
Supporting Evidence
- Measurable levels of intra- and extra-cellular toxins were detected in both field and culture samples.
- Extracellular PSTs were detectable in field and culture samples, suggesting they are bioavailable to marine life.
- Maximum intracellular STX values reached 0.5 and 0.2 μg STX equiv./L in 2004 and 2006 respectively.
- Extracellular STX levels were confirmed to be present in the marine environment during harmful algal blooms.
Takeaway
This study looked at toxins from harmful algae in the water and found that some toxins leak out into the water, which can be harmful to fish.
Methodology
Seawater samples were collected weekly from Sequim Bay and analyzed for intracellular and extracellular saxitoxin levels using receptor binding assay and ELISA.
Potential Biases
Potential bias in toxin quantification due to the selectivity of the assays used.
Limitations
The study only sampled one location in Sequim Bay, which may not reflect the highest toxin levels present in the marine environment.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
Digital Object Identifier (DOI)
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