Aquatic Insect Community as Indicator of Water Quality Assessment in Situ Gede System, Bogor, Indonesia

Abstract

Aquatic insects have important role in food web and can be used as bio-indicators in aquatic ecosystems. Each aquatic insect has different tolerance value to environment condition in which only few species can survive in polluted ecosystems. Thus, lakes condition can be evaluated by using aquatic insects. One of purpose of this study is to assess the water quality in four situ using aquatic insects community as biotic index. Insects and abiotic data were sampled once a month for five months (January, February, March, June, and July 2016) in Situ Gede Systems including Situ Gede (SG), Situ Panjang (SP) and Situ Burung (SB), compare with Situ LSI (SL) as an excluding the system. Twelve sampling points of littoral zone were selected in each situ. Insects were captured by filtering fifty-liter water of situ using net with 50 µm mesh size. Abiotic factors such as pH, temperature, DO, and turbidity of water measured at each situ. During the study period, aquatic insect community was represented by a total 598 individual from 14 families. Corixidae and Notonectidae were the most dominant family in all situ. Based on Hilsenhoff Biotic Index (HBI), all situ were fairly contaminated by organic compound.