Abstract
We report continuous in situ measurements of a population of the harmful algal bloom species Cochlodinium polykrikoides in a fixed volume of inshore waters near the island of Naro-do (34.478N and 127.558W), off the southern coast of Korea and where the earliest bloom of C. polykrikoides occurs regularly. This Lagrangian experiment was carried out by injecting the inert chemical tracer sulfur hexafluoride (SF 6) into a patch of seawater carrying C. polykrikoides and tracking the SF6-labeled water mass for 4 d. Our results suggest that in situ growth of C. polykrikoides within the SF6-labeled water accounts for only a fraction of the total cell increase. A probable mechanism we invoke here is that bloom initiation and much of the cell accumulation in inshore waters near Narodo are due to the input of C. polykrikoides cells via lateral mixing of inshore waters with the alongshore current containing high C. polykrikoides cell density.
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