ABSTRAK

Penelitian “Kajian Struktur Komunitas Perifiton dan Kualitas Air pada Keramba Jaring Apung di Sungai Barito Marabahan” bertujuan untuk mengetahui tingkat pencemaran air di Sungai Barito Kecamatan Marabahan menggunakan struktur komunitas perifiton dan indeks pencemaran, serta untuk menganalisis hubungan antara indeks pencemaran dengan indeks keanekaragaman perifiton menggunakan regresi linear sederhana.Metode yang digunakan berupa purposive sampling. Hasil perhitungan struktur komunitas perifiton autotrof kelimpahan sedang, keanekaragaman kriteria sedang hingga buruk, keseragaman merata hingga lebih merata, dan dominasi rendah. Perifiton heterotrof kelimpahan rendah, keanekaragaman kriteria buruk hingga sangat buruk, keseragaman cukup merata hingga tidak merata, dan dominasi rendah hingga tinggi. Indeks saprobitas tergolong α-mesosaprobik hingga oligosaprobik. Indeks pencemaran tergolong kedalam kriteria perairan kondisi tercemar ringan hingga kondisi baik.Hubungan antara indeks pencemaran dengan indeks keanekaragaman perifiton tergolong kuat hingga sangat kuat.

Kata Kunci: Perifiton, Struktur Komunitas, Indeks Pencemaran, Keramba Jaring Apung.

ABSTRACT

The research “Study Community Structure of Periphyton and Water Quality on Floating Net Cages in Barito Marabahan River” aims to determine the level of water pollution in the Barito River Marabahan District using the community structure of periphyton and pollution index, and analyzed the relationship between the pollution index and the periphyton diversity index using simple linear regression. The method used in this research was purposive sampling. The community structure calculation results of autotrophic periphyton is moderate abundance, the diversity of criteria is moderate to poor, uniformity even to more even, and low dominance. Heterotrophic periphyton is low abundance, the diversity of criteria is poor to very bad , uniformity quite even to uneven, and low to high dominance. The saprobity index is classified as α-mesosaprobic until oligosaprobic. Pollution index the status of water quality is classified as lightly polluted until good condition. The relationship between the pollution index and the periphyton diversity index is strong to very strong.

Keywords: Periphyton, Community Structure, Pollution Index, Floating Net Cages.