Peranan Makrozoobenthos sebagai Bioindikator Kualitas Air di Sungai Aek Pahu Hutamosu, Aek Pahu Tombak dan Batang Toru

Abstract

The research about The Rule of Macrozoobenthos as Water Quality Bioindicator in Aek Pahu Hutamosu, Aek Pahu Tombak and Batang Toru River was done from January to March 2013. Samples were taken from four observation station and were performed three times for each stations. Sample point was determined by using Purposive Random Sampling. Samples were taken by using Surber-net. The research showed 2 phylums of Arthropoda and Mollusca, 2 classes of Insecta and Gastropoda, 8 ordos of Coleoptera, Diptera, Ephemeroptera, Hemiptera, Odonata, Plecoptera, Trichoptera, and Mesogastropoda. Highest density of first station was genera larvae Atherix sp., about 74,07 ind/m2. Highest diversity index value was at third stations, about 2,78, and the lowest index value about 2,46 was at first station. Highest equitabilitas index about 0,92 was at second station and the lowest about 0,78 was at first station. Highest family biotic index about 5,17 was at third station. whereas the lowest about 4,19 was at fourth station. The Pearson Correlation statistic test showed that Light Penetration, TSS, DO, pH, BOD5, and Mn have direct correlation with index of diversity. According to PP No. 82 year 2001, water quality of river are in good quality.

Penelitian tentang Peranan Makrozoobenthos Sebagai Bioindikator Kualitas Air di Sungai Aek Pahu Hutamosu, Aek Pahu Tombak, dan Batang Toru telah dilakukan pada bulan Januari sampai dengan Mei 2013. Sampel diambil dari empat stasiun pengamatan, dan setiap stasiun dilakukan tiga kali ulangan. Titik pengambilan sampel ditentukan dengan metode Purposive Random Sampling. Sampel diambil dengan menggunakan Surber-net. Hasil penelitian didapatkan sebanyak 2 filum yaitu Arthropoda dan Mollusca, 2 kelas yaitu Insekta dan Gastropoda, 8 ordo yang terdiri dari Coleoptera, Diptera, Ephemeroptera, Hemiptera, Odonata, Plecoptera, Trichoptera, dan Mesogastropoda. Nilai Kepadatan tertinggi terdapat pada stasiun 1 dari spesies larva Atherix sp. adalah 74,07 ind/m2, 21,74%, 100%. Nilai indeks keanekaragaman tertinggi sebesar 2,78 terdapat pada stasiun 3. Nilai indeks keanekragaman terendah sebesar 2,46 terdapat pada stasiun 1. Nilai indeks keseragaman tertinggi terdapat pada stasiun 2 sebesar 0,92 dan yang terendah terdapat pada stasiun 1 sebesar 0,78. Kualitas air berdasarkan indeks famili biotik Sungai Aek Pahu Hutamosu, Aek Pahu Tombak dan Batang Toru tergolong kualitas air sedang sampai baik sekali. Uji statistik korelasi pearson faktor fisik kimia menunjukkan korelasi searah pada Penetrasi Cahaya, TSS, DO, pH, BOD dan Mn. Kualitas air berdasarkan sifat fisik kimia menurut PP No.82 Tahun 2001 Sungai Aek Pahu Hutamosu, Aek Pahu Tombak dan Batang Toru tergolong kualitas air baik sampai kualitas baik sekali.