Vertical and horizontal distribution of sand-dwelling dinoflagellates from Dinawan Island, Sabah, Malaysia

Mohammad Noor, Normawaty and Adam, Aimimuliani and Al-Has, Asilah and Saad, Shahbudin and Ahmad, Zuhairi (2016) Vertical and horizontal distribution of sand-dwelling dinoflagellates from Dinawan Island, Sabah, Malaysia. In: 2nd International Conference on Oceanography and Sustainable Marine Production (ICOSMaP 2016), 23rd-25th August 2016, Kuantan, Pahang. (Unpublished)

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Abstract

A study on the vertical and horizontal distribution of sand-dwelling dinoflagellates was conducted over a one year period in the coastal and lagoon areas of Dinawan Island. Fifty metre line transects were horizontally laid out perpendicular to the beach. At each station, 12–14 cm of sediments was vertically collected (10m interval). These sediments were divided every 2 cm over a 10 cm distance. At each slice of the sediments, sand-dwelling dinoflagellates were identified and counted. Furthermore, the sediments were sieved for sand size characteristics. Sand total phosphorus and total nitrogen were horizontally determined. Sixteen species of dinoflagellates were identified including five dominant dinoflagellates species viz. Prorocentrum lima, P. rhathymum, Amphidinium carterae, Bsymatrum caponii and Peridinium quinquercorne. The number of dinoflagellate cells was concentrated at the top 2 cm of the sediment and tended to decrease towards the deeper depth at the coastal and lagoon areas . The horizontal distribution of sand-dwelling dinoflagellates depended on the geomorphology of the area. In the coastal areas, the distribution of sand-dwelling organisms increased towards the sea but not towards the lagoon areas. However, a positive correlation was found between fine sediment size and sand dwelling abundance and not for other parameters studied. This indicates that the sediment characteristics played an important role in determining the abundance of sand-dwelling dinoflagellates.

Item Type:	Conference or Workshop Item (Speech/Talk)
Additional Information:	6635/57353
Uncontrolled Keywords:	sand-dwelling dinoflagellates
Subjects:	Q Science > Q Science (General)
Kulliyyahs/Centres/Divisions/Institutes (Can select more than one option. Press CONTROL button):	Kulliyyah of Science > Department of Marine Science
Depositing User:	Dr Normawaty Mohammad Noor
Date Deposited:	06 Jul 2017 16:04
Last Modified:	06 Jul 2017 16:04
URI:	http://irep.iium.edu.my/id/eprint/57353

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