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Harmful algal blooms: mechanisms, monitoring, and prevention in a rapidly changing world
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Responses of phytoplankton community to eutrophication in Semerak lagoon, Malaysia
P-B1-08
Po Teen LIM* , Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
Huey hui ER, Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
Li Keat LEE, Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
Zhen Fei LIM, Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
Kieng Soon HII, Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
Sing Tung TENG, Faculty of Resource Science and Technology, Universiti Malaysia Sarawak, 94300 Kota Samarahan, Sarawak, Malaysia.
Chui Pin LEAW, Bachok Marine Research Station, Institute of Ocean and Earth Sciences, University of Malaya, 16310 Bachok, Kelantan, Malaysia
Presenter Email: ptlim@um.edu.my |
| Drastic decline in the water quality and increased incidence of harmful algal blooms (HABs) have been frequently reported in Malaysia, partly owing to the intensifying anthropogenic activities such as aquaculture in the coastal embayment. In this study, the effects of aquaculture activities on the environmental parameters and phytoplankton community structure were investigated in a semi-enclosed lagoon located at Semerak River, Malaysia, between September 2015 and March 2016 . In Semerak River, cage aquacultures have been operated since 2000, with approximately 1120 fish cages situated along the river. Throughout the survey, elevated concentrations of phosphate and ammonia were observed at the aquaculture area and the inner lagoon. Relatively low dissolved oxygen, high total Chlorophyll a and high phytoplankton abundances but low species richness was recorded. Chaetoceros, Pseudo-nitzschia brasiliana, Blixaea quinquecornis, and Skeletonema blooms were observed, some were associated with anoxia condition. Eutrophication level assessed by UNTRIX suggests that the water quality in the lagoon is deteriorated. Dissolved inorganic phosphorus and nitrogen at the impacted area were 15 and 12 times higher than the reference sites, respectively. Such trophic status indices could provide a useful guideline for optimal aquaculture management plan to reduce the environmental impact caused by aquaculture. |
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