Sains Malaysiana 33(1): 53-61(2004)                                                                                                        Sains Hayat /

Life Science

Oligochaeta sebagai Penunjuk Biologi Ekosistem Lentik

Ahmad, A.M., Shuhaimi-Othman,

M. Barzani-Gasim & N. Mohd-Alwi

Pusat Pengajian Sains Sekitaran dan Sumber Alam

Fakulti Sains dan Teknologi

Universiti Kebangsaan Malaysia

43600 UKM Bangi Selangor D.E. Malaysia

ABSTRAK

Satu kajian awal telah dilakukan untuk melihat kehadiran dan kelimpahan organisma cacing akuatik di ekosistem Tasik Chini, Pahang (Laut Gumum). Persampelan telah dilakukan sebanyak dua kali pada tahun 2000. Analisis kualiti air juga telah dilakukan untuk menilai kualiti air tasik. Hasil kajian menunjukkan aras kepekatan nutrien dalam air tasik adalah rendah dan parameter fizikal lain seperti suhu, pH dan konduktiviti juga menunjukkan kawasan Laut Gumum, Tasik Chini adalah bebas daripada pencemaran. Berdasarkan pengkelasan interim sungai di Malaysia oleh Jabatan Alam Sekitar Malaysia (JAS), Laut Gumum, Tasik Chini berada antara kelas I hingga III dan menunjukkan kualiti air yang baik. Annelida merupakan filum paling dominan di kawasan kajian dan terdiri daripada dua famili iaitu Naididae dan Tubijicidae. Filum Annelida ini menyumbangkan sebanyak 59% daripada keseluruhan organisma yang disampel, manakala bakinya terdiri daripada filum Arthropoda dan Plathyhelmintes. Naididae adalah paling dominan dan merupakan >98% komposisi cacing akuatik yang disampel. Dero, Aulophorus, Pristina, Branchiodrilus dan Ripistes merupakan genus yang paling dominan di kawasan kajian dan menunjukkan pengadaptasian yang baik untuk ekosistem bebas cemar di Tasik Chini.

ABSTRACT

A preliminary study was conducted to determine the presence and abundance of aquatic worms in Lake Chini ecosystem, Pahang (Gumum Sea). Samplings were conducted twice in 2000. Water quality analysis was conducted to determine the water quality of the lake at the sampling locations. Results showed that nutrient levels in the water body was low and values for other physical parameters such as temperature, pH and conductivity suggested that Gumum Sea in Lake Chini is free from pollution. According to Malaysian interim river classification (Department of Environment, Malaysia), Lake Chini falls within class I to III which indicates good water quality. Annelida was the most dominant phylum found in the study area, which comprise of  two major families namely Naididae and Tubificidae.  This phylum contributed about 59% of the total individuals sampled and the rests were Arthropoda and Plathyhelmintes. Naididae was the most dominat family and contributed over 98% of the toal population of aquatic worms present. Dero, Aulophorus, Pristina, Branchiodrilus and Ripistes were amongst the dominant genera and showed good adaptations to the pollution free ecosystem of Lake Chini.

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