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모의 용승조건하에서 식물 플랑크돈 질산염 흡수기작의 생리적 적응
양성열(Sung Ryull Yang) 한국수산과학회 1997 한국수산과학회지 Vol.30 No.5
To study the physiological adaptation(shift-up) of phytoplankton under the simulated upwelling conditions, nitrate uptake capacity of Dunaliella tertiolecta batch culture was measured in the laboratory using the stable isotope ^(15)N-KNO₃. Contrary to the expected, there was no significant relationship between the maximum V_(NO3) (nitrogen specific nitrate uptake rate) and the initial nitrate concentration. However, there was a strong relationship between the maximum ρ_(NO3) (nitrate transport rate) and the initial nitrate concentration of <25μM, which was also influenced by the physiological status of the culture. The increase In V_(NO3) was mainly due to the increase in PON (particulate organic nitrogen) concentration and partly due to the increase in V_(NO3). When the phytoplankton population was severely shifted-down, the physiological adaptation of nitrate uptake was significantly inhibited at high initial nitrate concentrations. The timing of the maximum V_(NO3) or ρ_(NO3) was related to the initial nitrate concentration. At higher initial nitrate concentrations, maxima in V_(NO3) and ρ_(NO3) occurred 1 or 2 days later than at lower nitrate concentrations. This relationship was the opposite to the prediction from the shift-up model of Zimmerman et al.(1987). The shift-up process is apparently controlled by an internal time sequence and the initial nitrate concentration, but the magnitude of V_(NO3) was affected little by changes in nitrate concentration.
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