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Journal of Environmental Biology

pISSN: 0254-8704 ; eISSN: 2394-0379 ; CODEN: JEBIDP

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    Abstract - Issue Sep 2010, 31 (5)                                     Back


abstract_01

Diurnal vertical migration of Cochlodinium polykrikoides during

the red tide in Korean coastal sea waters

 

Young Sug Kim*1, Chang Su Jeong2, Gi Tak Seong3, In Sung Han3 and Young Sik Lee2

 

1East Sea Fisheries Research Institute of NFRDI, Gangrung - 210-861, Korea

 

2South Sea Fisheries Research Institute of NFRDI, Yeusu - 556-823, Korea

 

3National Fisheries Research Institute, Busan - 619-902, Korea

(Received: March 02, 2009; Revised received: August 18, 2009; Accepted: August 26, 2009)

 

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 is available online

 

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