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Journal of Environmental BiologypISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP |
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Abstract - Issue Sep 2010, 31 (5) BackDiurnal vertical migration of Cochlodinium polykrikoides
during the
red tide in Korean coastal sea waters Young 1East Sea Fisheries
Research Institute of NFRDI, Gangrung - 210-861, 2South Sea Fisheries
Research Institute of NFRDI, Yeusu - 556-823, 3National
Fisheries Research Institute, Busan - 619-902, (Received: Abstract: The diurnal vertical migration of Cochlodinium polykrikoides (C. polykrikoides), which caused a red tide in the Korean
coastal waters of the East Sea/Sea of Japan in September 2003, was examined by
determining the time-dependent changes in the density of living cells in
relation to the depth of the water column. The ascent of this species into the
surface layer (depth of water, 2 m) occurred during 1400-1500. The descent
started at 1600 and a high distribution rate (86%) at 15-20 m was observed at
0300. During the ascent, the cells were widely distributed at each depth level
from 0600 hr and at 0800-1100, the cells were
primarily distributed in the middle layer (0-6 m). The concentration of
dissolved inorganic nitrogen was generally <2.86 mmol l-1, but at 1400-1500, the concentration in the surface
layer reduced to <0.14 mmol l-1.
Moreover, the concentration gradually increased as the depth increased to >
5 m. These results showed that the nutrient-consumption rate associated with
the proliferation of C. polykrikoides during a red
tide is more influenced by the inorganic-nitrogen resources rather than the
inorganic-phosphorus compounds. Key
words: Cochlodinium
polykrikoides, Diurnal vertical migration, Red tide,
Nutrient ??????? PDF of full length paper
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