The ATREM+-based estimates were consistent with the predictions from the Hyperpro measurements, but the ATREM and Tafkaa-based estimates were not for April. PHYDOTax failed to accurately predict biodiversity for 31 October 2013, except for the PRM (Table5). The predicted community structure was statistically different from the in-water estimates and the proportions did not appear to follow any clear trend on this date as they did in April 2013. This was a period of an intense and patchy dinoflagellate bloom, especially so at the PRM and RTI stations as evidenced in the in-water estimates. PHYDOTax mostly failed to abequately discriminate between diatoms and dinoflagellates for October (Table5) for the ship-based radiometric spectra and the image spectra. The dominant dinoflagellate genus was Ceratium, a large, armored per I'd in in a containing dinoflagellate. This mismatch suggests that more work is needed to refine PHYDOTax in its skill differentiating between diatoms and dinoflagellates