BIODIVERSITY OF MACROBENTHIC INVERTEBRATES IN THE SEMENYIH RIVER: A REVISITED STUDYC.K. YAP, J. NOR HAFIZA, A. RAHIM ISMAIL, AND M. K. IZWAN
This study was to determine the density and abundance of macrobenthic invertebrates at Semenyih River, in order to compare those collected from the same river in 1997 as reported by Yap et al. (2003). The river generally supported diverse groups of macrobenthic invertebrates such as Tubificida, Trichoptera, Coleoptera, Gastropoda, Odonata as well as Crustacea. The data showed that the upstream stations have the highest density of Trichopteran larvae; Macrostemum similior and Amphipsyche meridiana in agreement with the good water quality at the upstream stations. On the other hand, the polluted downstream stations were dominated by a resistant worm, Limnodrilus hoffincisteri. Since this worm species is known to be able to tolerate polluted conditions such as low oxygen dissolved and therefore, the higher density of them at the polluted downstream stations can be used as a bioind ica tor for the polluted ecosystem. Therefore these Trichopteran larvae and resistant worm were good bioindicator for the clean and polluted river ecosystems, respectively, confirming those reported by Yap et at. (2003). In general, the species diversity was declining from the upstream to the downstream stations. Human activities such as constructions, agricultural activities, urbanization and inciustriali7ations along the river have been the major factors that influenced the density and abundance of macrobenthic invertebrates at the Semenyih River.
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