Sains Malaysiana 43(11)(2014): 1657–1663

Chironomid Spatial Distribution within the upstream of Sungai Langat Catchment

(Taburan Reruang Kironomid dalam Kawasan Hulu Tadahan Sungai Langat)

A.K. AHMAD*, Z. ABD. AZIZ & M. SHUHAIMI-OTHMAN

School of Environmental and Natural Resource Sciences, Faculty of Science and Technology

Universiti Kebangsaan Malaysia, 43600 Bangi, Selangor, Malaysia

Received: 23 October 2013/Accepted: 12 April 2014

ABSTRACT

A study on the chironomids (Diptera:Chironomidae) diversity at pristine ecosystem was carried out at upstream of Sungai Langat, Selangor. The study determines chironomids distribution and composition at 7 streams and river within the upstream site of Langat Catchment. Chironomid was sampled using Surber net and water quality was measured based on Malaysia WQI. The result indicated that Chironomidae was represented by three subfamilies namely Chironominae, Orthocladiinae and Tanypodinae, which comprises of 2502 individuals. Chironominae was the most dominant subfamily (1619 individuals) followed by Orthocladinae (629 individuals) and Tanypodinae (254 individuals). Polypedilum (subfamily: Chironominae) is the most dominant genus found followed by Rheocricotopus (subfamily: Orthocladiinae), Microtendipes and Cryptochironomus. Polypedilum was abundant in all stations except Sg. Langat 3 which was dominated by Rheocricotopus. Sungai Langat 3 has the highest number of individual (1113) which is (44.5%) from total chironomid individual and followed by Sg. Lolo with 468 individuals that were dominated by Polypedilum.

Keywords: Chironomid; Chironominae; Orthocladiinae; Sungai Langat; Tanypodinae

ABSTRAK

Kajian ke atas kepelbagaian chironomid (Diptera:Chironomidae) dalam ekosistem bebas cemar telah dijalankan di kawasan hulu, Sungai Langat, Selangor. Kajian ini adalah untuk mengenal pasti penyebaran dan komposisi kironomid pada 7 sungai dan anak sungai di kawasan tadahan Sungai Langat. Kironomid disampel menggunakan jaring Surber dan kualiti air yang diukur adalah berdasarkan piawai WQI Malaysia. Hasil kajian menunjukkan familiChironomidae diwakili oleh tiga subfamili yang dikenali sebagaiChironominae, Orthocladiinae danTanypodinae yang mempunyai sejumlah 2502 individu. Chironominae dikenal pasti sebagai subfamili yang paling dominan (1619 individu) diikuti olehOrthocladinae (629 individu) danTanypodinae (254 individu). Polypedilum (subfamili: Chironominae) adalah genus yang paling dominan yang diperoleh diikuti olehRheocricotopus (subfamili: Orthocladiinae), Microtendipes danCryptochironomus. Polypedilum mempunyai kelimpahan yang tinggi pada setiap stesen kecuali bagi Sg. Langat 3 yang didominasi olehRheocricotopus. Sungai Langat 3 mempunyai jumlah yang paling tinggi iaitu 1113 individu dan ini merupakan (44.5%) daripada jumlah keseluruhan individu kironomid dan diikuti oleh Sg. Lolo dengan 468 individu yang didominasi olehPolypedilum.

Kata kunci: Kironomid; Chironominae; Orthocladiinae; Sungai Langat; Tanypodinae

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*Corresponding author; email: abas@ukm.edu.my