Sains Malaysiana 45(4)(2016): 595–599

Comparison on the Cell Abundance of Benthic Dinoflagellates in Macrophytes and Water Column Collected from Open Coastal Waters and Semi-Enclosed Lagoon

(Perbandingan Kelimpahan Sel Dinoflagelat Bentos pada Makrofit dan Turus Air yang Diambil dari Pesisir Terbuka dan Teluk Semi Tertutup)

 

NORMAWATY MOHAMMAD-NOOR¹*, ASILAH AL-HAS², SHAHBUDIN SAAD¹

 & THAN AUNG²

 

¹Department of Marine Science, Kulliyyah of Science, International Islamic University Malaysia

Jalan Sultan Ahmad Shah, Bandar Indera Mahkota, 25200 Kuantan, Pahang Darul Makmur, Malaysia

 

²Borneo Marine Research Institute, Universiti Malaysia Sabah, Jalan UMS, 88400 Kota Kinabalu, Sabah, Malaysia

 

Received: 30 December 2014/Accepted: 2 November 2015

 

ABSTRACT

Benthic dinoflagellates are known to occur in the water column. The reason they can be found in different parts of the ecosystem is not clear. This study aims to determine the species and the cell abundance of benthic dinoflagellates in the water column and macrophytes collected from two different locations i.e. semi-enclosed lagoon and open coastal waters. The physico-chemical parameters (temperature, salinity, pH, dissolved oxygen) and nutrients (nitrate and phosphate) were determined. Results showed that in the lagoon, the most abundant dinoflagellate species on the macrophytes was also the most abundant dinoflagellate species in the water column. The species that dominated the water column and marophytes in the lagoon was Bysmatrum caponii. In the coastal area the trend was not clear. Coolia dominated the macrophytes whereas Peridinium quinquecorne dominated the water column. The physico-chemical parameters determined were similar at both sites except for nutrients. Results show that type of substrates and different geomorphology effects benthic dinoflagellates cell abundance in the macrophytes and water column.

 

Keywords: Benthic dinoflagellates; hydrodynamic; planktonic; seaweed; water column

 

ABSTRAK

Kehadiran dinoflagelat bentos di dalam turus air sememangnya diketahui. Sebab kehadiran organisma ini di dalam bahagian ekosistem yang berbeza tidak diketahui. Tujuan kajian ini ialah untuk mengenal pasti spesies dan kelimpahan sel dinoflagelat bentos di dalam turus air dan makrofit di dua lokasi berbeza iaitu di teluk separa tertutup dan di kawasan pesisir yang terbuka. Parameter fizikal-kimia (suhu, kemasinan, pH, oksigen terlarut) dan nutrien (nitrat dan fosfat) ditentukan. Keputusan menunjukkan di teluk, spesies yang banyak ditemui pada makrofit juga dijumpai banyak di dalam turus air. Spesies yang mendominasi makrofit dan turus air di teluk ialah Bysmatrum caponii. Namun, di kawasan pesisir, trendnya tidak jelas. Coolia didapati mendominasi makrofit tetapi Peridinium quinquecorne mendominasi turus air. Bacaan parameter fiziko-kimia di kedua-dua kawasan adalah sama kecuali nutrien. Keputusan menunjukkan bahawa jenis subtrak dan geomofologi yang berbeza mempengaruhi kelimpahan spesies yang hadir dalam makrofit dan turus air.

 

Kata kunci: Dinoflagelat bentos; hidrodinamik; planktonik; rumpair laut; turus air

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*Corresponding author; email: normahwaty@iium.edu.my