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Fatmawati Patang
Universitas Mulawarman, Indonesia
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Spatial Variation in Water Quality Based on Biotic Indices Along Urban River Reservoir Continuum in Samarinda Budiman, Budiman; Luthfiah, Khairunnisa; Patang, Fatmawati
Jurnal Biologi Tropis Vol. 26 No. 1 (2026): Januari-Maret
Publisher : Biology Education Study Program, Faculty of Teacher Training and Education, University of Mataram, Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29303/jbt.v26i1.11509

Abstract

The Karang Mumus River and Benanga Reservoir are water bodies that play a vital role in supporting ecological functions and meeting the socio-economic needs of urban dwellers of Samarinda. However, pressure from urban anthropogenic activities has caused a decline in water quality in both water bodies. This study aims to assess water quality along the Benanga Reservoir and Karang Mumus River using benthic macroinvertebrates as ecological indicators. Macroinvertebrate benthos sampling was conducted in March 2024 in the upper, middle, and lower reaches of the Karang Mumus River, as well as the Benanga Reservoir, which is the source of the river's water flow. Furthermore, water quality assessment along these waters was determined based on the importance value index (INP), Shannon-Wiener diversity (H'), evenness (E), and Simpson dominance (D), as well as biotic indices, namely BMWP-ASPT (Biological Monitoring Working Party-Average Score Per Taxon) and FBI (Family Biotic Index). The results of the study showed that Benanga Reservoir has a fairly high diversity (H' = 2.05), with a dominance of taxa sensitive to pollution, such as the Baetidae family, indicating relatively good water conditions. BMWP-ASPT and FBI values ​​indicate that the quality of Benanga Reservoir is relatively good. In contrast, the upstream, middle, and downstream segments of the Karang Mumus River showed a gradual decline in water quality. In the middle and downstream segments, the dominance of taxa tolerant of aquatic environmental pollution, such as Lestidae and Tubificidae, was observed, along with a high FBI value (9.49), indicating that the water is highly polluted with organic materials.
Co-Authors Aditya, Zahwa Adela Annida Nurul F. A., Annisa Nurul Ilmi dan Fauzan Ibram M. Ari Susandi Sanjaya Aryani., Retno Bambang Purnama Budiman Didit Suprihanto, Didit Dijan Sunar Rukmi Dwi Susanto Fadhila, Fasya Febry Rahmadhani Hasibuan Fudiantoro, Aldi Hetty Manurung Hetty Manurung, Hetty Kurniati, Reni Linda Oktavianingsih Luthfiah, Khairunnisa Maya Dewi Norani Nadhifa Aurelia Wirawan Nawwar Mardianto Nova Hariani Prahastika, Widha Purnama, Bambang Ratna Kusuma, Ratna Ratnasari, Tiara Halidah Retno Aryani. Rudianto Rudianto Rudianto Rudianto Rudianto Rudianto Rudy Agung Nugroho Rudy Nugroho Samsurianto Samsurianto Samsurianto Samsurianto Sanjaya, Ari Susandi Sari, Wulan Iyhig Ratna Trimurti, Sus Wesley, Sitohang Widha Prahastika Widha Prahastika Wulan Iyhig Ratna Sari Yanti Puspita Sari Yuliatin, Ervinda