The effects of light intensity and photoperiod on the growth of Cochlodinium polykrikoides

Cornelia Peter Ahman, (2008) The effects of light intensity and photoperiod on the growth of Cochlodinium polykrikoides. Universiti Malaysia Sabah. (Unpublished)

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Abstract

The marine planktonic dinoflagellate Cochlodinium polykrikoides have been responsible for the recent occurrences of harmful algal blooms in Sabah's coastal waters which previously occur commonly in Korea and Japan coastal water. The bloom of Cochlodinium polykrikoides had caused major aquaculture fish kills and economic losses. Cochlodinium polykrikoides blooms occur in both temperate and tropical regions. A laboratory experiment was carried out to determine the effects of light intensity and photoperiod on the growth of Cochlodinium polykrikoides. The experiment was carried out for three weeks in a constant temperature growth room of 25±2°C and constant salinity of 30±2 ppt. There were three different photoperiods (24H L: 0, 16H L: 8H D, 12H L: 12H D) and four light intensities (50µmol m�²s�¹, 100 µmol m�²s�¹, 150µmo1 m�²s�¹, 200µmol m�²s�¹) used to examine the effects of the two factors on the growth of Cochlodinium polykrilcoides. The results of the experiment indicated that higher cell density was achieved at 16H L: 8H D condition at all light intensity. Lower cell density was observed in light intensity higher than 100µmol m�²s�¹. The chlorophyll a concentration was higher during the exponential phase of cultures which is during the second week. Light intensity and photoperiod influenced the growth of Cochlodinium polykrikoides as significant effects were evidenced from the statistical analysis done.

Item Type: Academic Exercise
Uncontrolled Keywords: marine planktonic, Cochlodinium polykrikoides, algal blooms, coastal water, chlorophyll
Subjects: S Agriculture > SB Plant culture
Divisions: SCHOOL > School of Science and Technology
Depositing User: Unnamed user with email storage.bpmlib@ums.edu.my
Date Deposited: 16 May 2016 05:16
Last Modified: 30 Oct 2017 02:37
URI: http://eprints.ums.edu.my/id/eprint/13159

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