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KEANEKARAGAMAN MAKROZOOBENTHOS DI BAGIAN HULU SUNGAI HORAS KECAMATAN HATONDUHAN KABUPATEN
SIMALUNGUN SUMATERA UTARA
ABSTRAK
Keanekaragaman Makrozoobenthos di Bagian Hulu Sungai Horas Kecamatan Hatonduhan Kabupaten Simalungun Sumatera Utaratelah diteliti pada bulan April sampai Mei 2016. Sampel diambil dari tiga stasiun pengamatan dan dilakukan ulangan sebanyak limabelas kali pada setiap stasiun. Titik pengambilan sampel ditentukan dengan menggunakan metode “purposive sampling”. Sampel makrozoobenthos diambil dengan menggunakan alat surber net. Berdasarkan hasil penelitian didapatkan sebanyak 14 genus makrozoobenthos yang termasuk kedalam 13 famili, 7 ordo dan 2 kelas. Nilai kepadatan tertinggi terdapat pada genus Calopterys sebesar 34,07 ind/m2 (stasiun I). Indeks keanekaragaman makrozoobenthos (H‟) tertinggi terdapat pada stasiun III sebesar 2,0 dan terendah pada stasiun I sebesar 1,75. Indeks Keseragaman (E) tertinggi pada stasiun III sebesar 0,96 dan terendah pada stasiun I sebesar 0,84. Indeks Biotik Famili (FBI) terendah yaitu pada stasiun I sebesar 3,67 yang menandakan stasiun ini tidak tercemar bahan organik.
Kata kunci: Sungai Horas, Keanekaragaman, Makrozoobenthos, Indeks Biotik Famili.
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THE DIVERSITY OF MAKROZOOBENTHOS IN UPSTREAM OF HORAS RIVER SUBDISTRICT OF HATONDUHAN DISTRICT OF
SIMALUNGUN NORTH SUMATERA
ABSTRACT
The Diversity of Makrozoobenthos in Upstream of Horas River Subdistrict of Hatonduhan District of Simalungun North Sumaterahas been observed from April to May 2016. The sample was taken from three stations of observation, fiveteen replications were conducted in each station. The point of sampling was determined by using “Puposive Sampling” Method. The samples was taken by using surber net. The result of research indicated 14 genus of makrozoobenthos consisting of 13 families, 7 orders, and 2 class. The highest density was found in genus of Calopteryx, 34, 07 ind/m2 (station I). The highest diversity index of makrozoobenthos was found in station III, about 2,0 and the lowest one was in station I, about 1,75. The highest equitability index (E) was found in station III, about 0,96 and the lowest one was in station I, about 0,84. The lowest Famili Biotik Index (FBI) was found n station I, about 3,67
Keywords: Horas River, Diversity, Makrozoobenthos, Famili Biotik Index (FBI).
