Abstract
The main problem that arises so far is the declining water quality of Pepe river due to increased human population and industrial activities along the Pepe River. This research was conducted in August 2017 using purposive random sampling method in three stations. Theobjective of this research is to provide basic information about the change of macrozoobenthos community structure which can be used as bioindicator of environmental quality in downstream of Pepe River. The results of this study showed that 72 macrozoobenthos species were found in 4 Class and 3 Fillum. The biological parameters showed that the upstream, center and downstream of the Pepe River was highly polluted, characterized by low diversity index, high density and high dominance index and low diversity. This study foundthree tolerant species that can be used as bioindicator of quality of water in the lower part of the Pepe River, i.e., Chirronomus sp, Pheretima sp, Cheumatopsyche,Melanoides maculata, Melanoides punctata and Thiara scabra. Based on the calculation of mFBI that can be used as an initial estimation of water quality status, Pepe river is very heavy polluted by organic matter.
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