<i>Dinophysis acuminata</i> densities (cells mL<sup>-1</sup>) at the end of nutrient amendment experiments conducted during 2011 using water collected from Meetinghouse Creek, New York.

<p>Bars are means while error bars represent the SD of triplicate bottles. Asterisks indicate treatments that are significantly different from the unamended control. C = Control, B<sub>12</sub> = vitamin B<sub>12</sub> and B<sub>1</sub> = vitamin B<sub>1</sub>.</p>