Pseudo-nitzschia species, toxicity, and dynamics in the southern Indian River Lagoon, FL

•Pseudo-nitzschia was one of the most abundant diatoms in the southern IRL system.•First report of Pseudo-nitzschia micropora and P. fraudulenta in the IRL.•First report of Pseudo-nitzschia micropora producing DA.•First wide-spread report of DA in the southern IRL system.•Pseudo-nitzschia prefers higher salinities and cooler temperatures in the IRL.