Relationships among water column toxins,cell abundance and chlorophyll concentrations during Karenia brevis blooms |
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| Authors: | Patricia A Tester Damian Shea Steven R Kibler Sabrina M Varnam Megan D Black R Wayne Litaker |
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| Institution: | 1. National Ocean Service, NOAA, 101 Pivers Island Road, Beaufort, NC 28516, USA;2. Department of Environmental and Molecular Toxicology, North Carolina State University, P.O. Box 7633, Raleigh, NC 27695, USA |
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| Abstract: | The assumptions that Karenia brevis cell abundance and brevetoxin concentrations are proportional and that cell abundance and chlorophyll are related were tested in a 3-year field study off the west coast of Florida. The relationship between K. brevis cell abundance and brevetoxins (PbTx-2+PbTx-3) in whole water samples was strong (R2=0.92). There was no significant difference between the brevetoxin concentrations in whole water and the >0.7 μm particulate fraction. Only 7% of the total brevetoxin concentration was measured in the <0.7 μm (cell free) filtrate. The relationship of K. brevis cell abundance >5000 cells L−1 with chlorophyll for all cruises and at all depths was robust (R2=0.78). These data substantiate the use of chlorophyll as a proxy for K. brevis cell abundance and K. brevis cell abundance as a proxy for brevetoxins during blooms. The ratios of the brevetoxins, PbTx-2:PbTx-3, was significantly higher in surface water than in bottom water. This information in conjunction with K. brevis growth rates may provide a useful indicator for determining the physiological state of the bloom over time. |
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| Keywords: | Brevetoxins PbTx Satellite remote sensing Gulf of Mexico Florida West Florida shelf 26° N 82° W 26° N 86° W 30° N 81 5° W 30° N 86° W |
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