Sains Malaysiana 36(2): 139-148 (2007)

Taburan Ostrakod di dalam Sedimen Luar Pantai

di Sekitar Pulau Tinggi, Johor

(Distribution of Ostracods in Offshore Sediment

around Pulau Tinggi, Johor)

Noraswana Nor Faiz, Ramlan Omar & Basir Jasin

Pusat Pengajian Sains Sekitaran dan Sumber Alam

Fakulti Sains dan Teknologi,Universiti Kebangsaan Malaysia

43600 UKM Bangi, Selangor D.E., Malaysia

Diserahkan: 18 Januari 2007 / Diterima: 27 Februari 2007

ABSTRAK

Suatu kajian mengenai taburan ostrakod dalam sedimen luar pantai telah dilakukan di sekitar Pulau Tinggi, Johor. Sebanyak 11 stesen telah ditentukan sebagai kawasan persampelan. Kelimpahan ostrakod di kawasan kajian ini adalah tinggi. Sebanyak 1975 spesimen yang terdiri daripada 16 famili, 36 genus dan 51 spesies telah dijumpai. Famili Trachyleberididae mempunyai kepelbagaian spesies yang paling tinggi dengan 19 spesies ditemui dan famili ini juga adalah yang paling dominan dengan 589 spesimen ditemui. Spesies paling dominan ialah Loxoconcha malayensis Zhao & Whatley, 1989 dengan 131 jumlah spesimen. Beberapa parameter fiziko-kimia in-situ iaitu suhu, oksigen terlarut (DO), kedalaman, saliniti dan pH telah diukur. Nilai julat masing-masing ialah 26.29-29.02^oC, 4.49-6.87 mg/l, 8.30-35.00 m, 34.01-38.90 ppt dan 8.11-8.20. Bagi parameter fiziko-kimia yang diukur secara ex-situ iaitu peratus bahan organik, pasir, lempung dan lodak pula, nilai julat masing-masing ialah 4.91-10.73%, 88.41-97.26%, 0.84-7.49% dan 1.89-6.22%. Tekstur sedimen di kawasan kajian ini boleh dikelaskan kepada pasir kasar, pasir sederhana dan pasir halus. Tekstur yang paling dominan adalah jenis pasir sederhana. Analisis korelasi menunjukkan bahawa saliniti, peratus bahan organik, peratus lempung, dan peratus lodak mempunyai hubungan korelasi positif dan signifikan dengan kelimpahan ostrakod manakala suhu dan peratus pasir menunjukkan hubungan korelasi negatif yang juga signifikan dengan kelimpahan ostrakod. Parameter-parameter lain tidak menunjukkan hubungan yang signifikan.

Kata kunci: Taburan; ostrakod; sedimen luar pantai; Pulau Tinggi

ABSTRACT

A study was conducted to determine the distribution of ostracods in offshore sediment around Pulau Tinggi, Johor. A total of 11 stations were determined as sampling area. The abundance of ostracods is high in this study area. A total of 1975 specimens were found belonging to 16 families, 36 genera and 51 species. Family Trachyleberididae has the highest diversity of species with 19 species recorded and the most dominant family with 589 specimens. The most dominant species is Loxoconcha malayensis Zhao & Whatley, 1989 with 131 specimens. Several in-situ physico-chemical parameters such as temperature, dissolved oxygen (DO), depth, salinity and pH were measured. The range values for each of these parameters are 26.29-29.02^oC, 4.49-6.87 mg/l, 8.30-35.00 m, 34.01-38.90 ppt and 8.11-8.20, respectively. For ex-situ physico-chemical parameters such as percentage of organic matter, sand, clay and silt, the range values for each parameters were 4.91-10.73%, 88.41-97.26%, 0.84-7.49% and 1.89-6.22%, respectively. The sediment texture in this study area can be categorized as fine, medium and coarse sand. The most dominant texture is medium sand. Correlation analysis shows that salinity, the percentages of organic matter, clay and silt are positively and significantly correlated with the abundance of ostracods while temperature and percentage of sand are negatively and significantly correlated with ostracod abundance. Other parameters do not show any significant correlation.

Keywords: Distribution; ostracods; offshore sediment; Pulau Tinggi

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