Sungai Banjir Kanal Barat Semarang merupakan sungai dengan daerah padat pemukiman yang menyumbang suplai material organik maupun anorganik. Hal ini dapat menyebabkan pencemaran di perairan tersebut. Limbah dapat mempengaruhi kualitas perairan dan biota di dalamnya. Tujuan dari penelitian adalah untuk mengetahui hubungan antara kandungan bahan organik sedimen dengan kelimpahan makrozoobenthos, hubungan antara tekstur sedimen dengan kandungan bahan organik sedimen, serta hubungan antara tekstur sedimen dengan kelimpahan makrozoobenthos di muara dan sungai Banjir Kanal Barat, Semarang. Penelitian ini dilaksanakan pada bulan Maret - April 2018 dengan menggunakan metode kuantitatif. Penentuan lokasi sampling menggunakan purposive sampling yang terdiri dari 4 stasiun. Metode analisis statistik yang digunakan adalah uji normalitas, korelasi, regresi. Makrozoobenthos yang didapatkan adalah Nereis, Nephthys, Melanoides, Cerithium, Pomacea, Dreissena, dan Corbicula. Fraksi liat dan kandungan bahan organik memiliki hubungan yang positif dengan nilai korelasi r = 0,893. Fraksi liat dengan kelimpahan makrozoobenthos memiliki hubungan yang positif dengan nilai korelasi r = 0,906. Hal ini sama dengan kandungan bahan organik sedimen dengan kelimpahan makrozoobenthos juga memiliki hubungan yang positif dengan nilai korelasi r = 0,928. Semakin besar kandungan bahan organik sedimen dan makrozoobenthos. Kualitas perairan berdasarkan indeks keanekaragaman di stasiun IV sebesar 1,2 yang tergolong tercemar sedang. Sedangkan pada stasiun I, II dan III dengan nilai 0,15; 0,15 ; 0,93 termasuk tercemar berat. Banjir Kanal Barat Semarang is a river with densely populated areas that contribute to the supply of organic and inorganic materials. This can cause pollution in these waters. Waste can affect the quality of water and biota in it. The purpose of this study was to determine the relationship between sediment organic matter with abundance of macrozoobenthos, the relationship between sedimentary texture and organic sediment materials, as well as the relationship between sedimentary texture and abundance of macrozoobenthos in estuaries of Banjir Kanal Barat, Semarang. This research was conducted in March - April 2018 using kuantitative method. Kinds of macrozoobenthos was found from genus Nereis, Nephthys, Melanoides, Cerithium, Pomacea, Dreissena, and Corbicula. Determination of the sampling location using purposive sampling method. The clay fraction and the abundance of sediment organic matter have a positive relationship with the correlation value r = 0.893. The clay fraction with abundance of macrozoobenthos has a positive relationship with the correlation value r = 0.906. This is the same as the abundance of organic sediment material with abundance of macrozoobenthos also has a positive relationship with the correlation value r = 0.928. the greater the percentage of clay, the more abundant the organic matter of sediment and makrozoobenthos.
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