Occurrence of Takayama (Dinophyceae) in Uranouchi Inlet, Japan

Abstract

This study investigated the temporal and spatial variations of Takayama blooms in Uranouchi Inlet, Japan. From July to September 2017, Takayama cells appeared (≥1 cell mL⁻¹) at depths of 0–10 m, temperatures of 25.4–31.7°C, and salinities of 23.1–34.2. The maximum cell density was 1.37×10³ cells mL⁻¹. By analyzing partial rDNA sequences of Takayama strains collected at the bloom initiation, we found Takayama acrotrocha/Takayama xiamenensis and Takayama tasmanica in the Uranouchi Inlet. This study contributes to understanding of the dynamics of and risk to aquaculture of Takayama blooms in the coastal waters of Japan.