Sains Malaysiana 39(2)(2010): 199–207

Taburan Ostracoda Resen di dalam Sedimen Luar  Pantai Sekitar Pulau Besar, Johor

(Distribution of Recent Ostracoda in Offshore Sediment Around Pulau Besar, Johor)

Ramlan Omar* & Noraswana Nor Faiz

Pusat Pengajian Sains Sekitaran dan Sumber Alam

Fakulti Sains dan Teknologi, Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor, Malaysia

Received: 8 April 2009 / Accepted: 29 September 2009

ABSTRAK

Kajian mengenai taburan ostrakod di dalam sedimen luar pantai telah dijalankan sekitar Pulau Besar, Johor. Sebanyak 11 stesen telah dipilih sebagai stesen pensampelan. Sebanyak 47 spesies ostrakod hidup dan mati daripada 37 genus dan 18 famili telah dikutip dan dikenal pasti. Sebanyak 1036 spesimen mati dan 932 spesimen hidup telah dijumpai di kawasan kajian. Spesies yang paling dominan adalah Pistocythereis cribriformisdan famili yang paling dominan ialah Trachyleberididae. Famili yang mempunyai kepelbagaian spesies terbanyak ialah Trachyleberididae dengan 14 spesies. Beberapa parameter fiziko-kimia telah diukur secara in-situ terdiri daripada suhu, saliniti, oksigen terlarut, pH dan kedalaman. Julat bagi setiap parameter masing-masing adalah 27.05-30.80oC, 31.20-34.01 ppt, 6.90-11.93 mg/L dan 6.60-20.50 m. Bagi parameter fiziko-kimiaex-situ seperti peratus bahan organik, pasir, lodak dan lempung dengan julat bagi setiap parameter masing-masing adalah 1.98-7.58%, 74.87-95.05%, 0.05-24.21% dan 0.75-9.74%. Tekstur sedimen di kawasan kajian boleh dikelaskan kepada pasir berlodak, pasir sangat halus, pasir halus, pasir sederhana dan pasir kasar. Indeks Shannon-Wiener, H(S) yang paling tinggi dicatatkan pada stesenST 6 dengan 2.91 dan paling rendah pada stesenST 11 iaitu 2.26. Kelimpahan dan kepelbagaian ostrakod adalah berkait dengan ciri-ciri sedimen. Peratus lodak menunjukkan korelasi positif yang signifikan manakala suhu dan peratus pasir menunjukkan korelasi negatif yang signifikan dengan kelimpahan ostrakod bentos. Parameter-parameter fiziko-kimia yang lain tidak menunjukkan hubungan yang signifikan.

Kata kunci: Ciri-ciri sedimen; dominan; kelimpahan; kepelbagaian; ostracoda

ABSTRACT

The study on distribution of ostracods in offshore sediment was made around Pulau Besar, Johor. A total of 11 stations were chooser. A total of 47 species, both living and dead belonging to 37 genera and 18 families were collected and had been identified. A total of 1063 dead specimens and 932 living specimens of ostracoda were found in the study area. The dominant species was Pistocythereis cribriformis and the dominant family was Trachyleberididae. Family that had the most high species diversity was Trachlyeberididae with 14 species. Several physico-chemical parameters were measured in-situ including temperature, salinity, dissolved oxygen and depth. The values for each of these parameters range from 27.05-30.80oC, 31.20-34.01 ppt, 6.90-11.93 mg/L and 6.60-20.50 m, respectively. For ex-situ physico-chemical parameters such as percentage of organic matter, sand, clay and silt with the range values for each parameter were 1.98-7.58%, 74.87-95.05%, 0.05-24.21% and 0.75-9.74%, respectively. The sediment texture in this study area can be categorized as silty sand, very fine sand, fine sand, medium sand and coarse sand. Shannon-Wiener diversity Index, H(S) was highest at ST 6 station with 2.91 and lowest at ST 11 station with 2.26. The abundance and diversity of ostracod were most related to the character of the sediment. The percentage of silt were positively and significantly correlated with the abundance of ostracods while temperature and percentage of sand are negatively and significantly correlated with benthic ostracod abundance. Other parameters do not show any significant correlation.

Keywords: Abundance; character of the sediment; dominant diversity; ostracoda

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*Corresponding author; email: rbo@ukm.my