Wind Driven Occurrence Of The Marine
Dinoflagellate Alexandrium Tamarense In
A Shallow Coastal Water
Author(s)
A. Murata & S. Taguchi
Abstract
Occurrence and bloom of dinoflagellate Alexandrium tamarense were examined
with environmental factors at the central station in a semi-enclosed shallow bay
during the period from 1992 to 2004. Vegetative cells of A. tamarense occurred
distinctively between 70 and 141 Julian days every year. The maximum standing
crop of A. tamarense, integrated for a water column (0 to 20 m), always occurred
after the occurrence of maximum water density at the bottom layer which was
formed by upwelled water from the outside of the bay. The maximum standing
crop of A. tamarense ranged from 9.4 × 103 in 1999 to 3.0 × 106 cells m−2 in
1992. Winter standing stock of nutrients was not related with the variability in
the standing crop of A. tamarense. Tidal change and speed were not identified to
be related with the variability in the standing crop although the maximal tidal
change was almost 4 m due to the physical structure of the bay. When a water
column was well mixed and water stability was the minimum of 0.0155 σt m−1 as
observed in 1999, the standing crop of A. tamarense was exceptionally
suppressed. The variability in the standing crop was significantly related with the
wind exposure (m2 s−1) estimated from the fetch (m) and wind velocity (m s−1)
from North ± 45o directions (p < 0.01). The size of standing crop might be
controlled by the physical force. Alexandrium tamarense may take a survival
strategy to utilize (1) the upwelling as a stirring-up mechanism for resting cysts
from the bottom sediments, (2) the stratification of water column to sustain cell
division, and (3) wind exposure to enhance the accumulation of cells.
Keywords: N:P ratio, regenerated nutrients, toxin, wind exposure, water
stability.
Keywords
N:P ratio, regenerated nutrients, toxin, wind exposure, water
stability.
Related Book
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