The effect of nitrate and phosphate on the growth of harmful algae Cochlodinium polykrikoides

Wilson Bodingin (2008) The effect of nitrate and phosphate on the growth of harmful algae Cochlodinium polykrikoides. Universiti Malaysia Sabah. (Unpublished)


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The harmful algae species Cochlodinium polykrikoides was studied to investigate the effects of nitrate and phosphate concentrations on the growth and chlorophyll a production. The experiments were conducted at constant temperature 25°C, l00μmolm�²s�¹ and under 12:12 light: dark photo cycle and the culture media used was the f/2 media with nitrate concentrations ranged from 2.21X10��M to 1.09X10�³M and phosphate concentrations ranged from 9.06X10��M to 5.07X10��M. In the nitrate experiment, the cells density increase significantly (P<0.05) as the nitrate concentration increased. C polykrikoides exhibited the highest maximum cell density (512±97cells/mL) at nitrate concentration 9.41X10��M with chlorophyll a 6.8708mg/m³. The growth of the Cochlodinium polykrikoides are inhibited at the highest nitrate concentrations (1.09X10�³M) and the lowest nitrate concentrations (2.21Xl0��M). In the phosphate experiments, the growth of C polykrikoides are also significantly affected (P<0.05) where the highest cell density (742±52cells/mL) was recorded at the lowest phosphate concentrations 9.06Xl0��M with the highest concentration of chlorophyll a at 72.967 mg/m³. The cell density decrease as the phosphate concentrations increases and their growth was inhibited at concentrations of 4.35X10��M and 5.07X10��M. The concentrations of chlorophyll a shows a positive relationship with the cell density

Item Type: Academic Exercise
Keyword: nitrate, phosphate, chlorophyll, temperature, Cochlodinium polykrikoides, cell density
Subjects: S Agriculture > SH Aquaculture. Fisheries. Angling
Department: SCHOOL > School of Science and Technology
Date Deposited: 06 Mar 2014 15:40
Last Modified: 12 Oct 2017 13:40

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