Water Quality and Aquatic Insects Study at the Lower Kinabatangan River Catchment, Sabah: In Response to Weak La Niña Event (Kajian Kualiti Air dan Serangga Akuatik di Hilir Sungai Kinabatangan, Sabah: Respons kepada Fenomena La Niña Berskala Lemah)

Sahana Harun, and Salman Abdo Al-Shami, and Ramzah Dambul, and Maryati Mohamed , and Mohd Harun Abdullah, (2015) Water Quality and Aquatic Insects Study at the Lower Kinabatangan River Catchment, Sabah: In Response to Weak La Niña Event (Kajian Kualiti Air dan Serangga Akuatik di Hilir Sungai Kinabatangan, Sabah: Respons kepada Fenomena La Niña Berskala Lemah). Sains Malaysiana, 44 (4). 545-558. ISSN 0126-6039

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Abstract

A study on water quality and aquatic insects has been conducted at the Lower Kinabatangan River Catchment, Sabah, Malaysia. The quality of water surface and aquatic insects’ composition were studied in streams near to oil palm plantation (OP), secondary forest (SF) and oxbow lake (OB). The study also aims to identify the seasonal variation in the aquatic insects’ composition during the weak La Niña event. A total of 135 water samples and 1678 aquatic insect individuals (four orders and 14 families) were collected during fieldwork campaign that spanned over the inter-monsoonal period, wet and dry seasons between October 2004 and June 2005. OP has the highest abundance of aquatic insects particularly during the dry season. Biological indices showed that all stations were in moderate water category. The water quality index (WQI) was calculated and indicated that the quality of the river categorised into Class II. Discriminant analysis(DA) was employed to classify the independent variables into mutually-exclusive groups. Suspended sediment (SS) and chemical oxygen demand (COD) were high during the wet season. Suspended sediment was high in oxbow lake and could be a strong reason behind low abundance of aquatic insects. Precipitation anomalies were found to affect seasonal variations of water quality and aquatic insects at the Lower Kinabatangan River

Item Type:Article
Uncontrolled Keywords:" Aquatic insects; average score per taxa (ASPT); biological monitoring work party (BMWP); Lower Kinabatangan River catchment; water quality index (WQI)
Subjects:T Technology > TD Environmental technology. Sanitary engineering
ID Code:12059
Deposited By:IR Admin
Deposited On:28 Oct 2015 13:18
Last Modified:28 Oct 2015 13:18

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