Table 3.
Linear regressions with 2020 data for phycotoxins in oysters versus phycotoxins in solid phase adsorption toxin tracking devices (SPATT), cell concentrations determined by microscopy (scope), or by quantitative real-time PCR (qPCR).
| Lag Time | Predictor | AZA1a,b | AZA2b | DAc | PTX2d |
|---|---|---|---|---|---|
| No lag | SPATT | – | 0.005 | 0.4 | 0.3 |
| – | (p = 0.3, n = 36) | (p < 0.0001, n = 36) | (p = 0.001, n = 36) | ||
| Scope | – | – | 0.2 | 0.3 | |
| – | – | (p = 0.002, n = 36) | (p = 0.0002, n = 36) | ||
| qPCR | −0.04 | 0.01 | 0.1 | −0.04 | |
| (p = 0.6, n = 23) | (p = 0.3, n = 23) | (p = 0.05, n = 23) | (p = 0.8, n = 23) | ||
| Two-week lag | SPATT | – | −0.03 | 0.2 | 0.2 |
| – | (p = 1, n = 33) | (p = 0.004, n = 33) | (p = 0.005, n = 33) | ||
| Scope | – | – | 0.04 | 0.007 | |
| – | – | (p = 0.1, n = 33) | (p = 0.3, n = 33) | ||
| qPCR | 0.08 | −0.03 | 0.3 | −0.05 | |
| (p = 0.1, n = 20) | (p = 0.5, n = 20) | (p = 0.009, n = 20) | (p = 0.7, n = 20) |
The R2 is reported with the p-value and sample size. Significant linear regressions are bolded.
AZA1 = azaspiracid-1, AZA2 = azaspiracid-2, DA = domoic acid, PTX2 = pectenotoxin-2.
AZA1 was not detected on SPATTs in 2020.
AZA-producing cells from the family Amphidomataceae, were too small to be detected by microscopy.
Pseudo-nitzschia spp. cells were enumerated by microscopy and by qPCR (cells/mL) to compare with DA concentrations in oyster samples.
Dinophysis spp. cells were enumerated by microscopy and by qPCR (cells/mL) to compare with PTX2 concentrations in oyster samples.