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Abstrak. Penelitian ini bertujuan menentukan status mutu kualitas air di bagian hulu Sungai Cileungsi serta membandingkan beberapa parameter kualitas air dengan baku mutu kelas II berdasarkan PP RI No.82 Tahun 2001. Penelitian dilakukan bulan September, Oktober dan November 2013 pada empat stasiun pengambilan contoh di bagian hulu Sungai Cileungsi. Data hasil penelitian dianalisis mengggunakan Indeks Kualitas Air-NSF serta secara deskriptif dibandingkan dengan baku mutu kelas II menurut PP RI. No.82 tahun 2001. Hasil penelitian (Suhu air: 23 – 29,3 oC; pH: 6; Oksigen Terlarut: 6,23 - 6,88 mg/L; DHL: 139,6 - 186,3 µS/cm; Kekeruhan: 4,77 - 41,8 mg/L; TDS: 70 - 94 mg/L; TP: 0,026 - 0,099 mg/L; Ortofosfat < 0,002 mg/L; Nitrat: 0,36 - 0,959 mg/L) menunjukkan kualitas perairan yang masih memenuhi baku mutu. Sedangkan untuk parameter (BOD5: 3,97 - 5,7 mg/L; COD: 14,68 - 48,06 mg/L) menunjukkan nilai yang telah melampaui ambang batas baku mutu kelas II PP RI. No.82 tahun 2001. Namun, secara keseluruhan hasil analisis dengan menggunakan IKA-NSF menunjukkan bahwa kualitas air di semua stasiun memiliki kualitas perairan yang baik dengan rentang skor 78 - 83.Kata kunci : Sungai Cileungsi; Kualitas Air; Pencemaran

ABSTRAKDanau Toba merupakan danau terbesar di Indonesia yang terletak di Provinsi Sumatera Utara. Danau Toba banyak dimanfaatkan oleh masyarakat untuk kegiatan budi daya ikan di keramba jaring apung (KJA), pertanian, pariwisata, dan pemukiman penduduk. Aktivitas-aktivitas tersebut akan memberikan masukan berupa bahan organik dan anorganik yang akan memengaruhi kualitas air dan dapat menyebabkan terjadinya eutrofikasi. Beberapa indikator eutrofikasi adalah terjadi peningkatan biomassa fitoplankton dan perubahan struktur komunitas fitoplankton. Tujuan dari penelitian ini adalah untuk mengkaji struktur komunitas fitoplankton di Danau Toba. Penelitian ini dilakukan pada tanggal 2024 Oktober 2014 di 23 stasiun di perairan sekitar Pulau Samosir, Danau Toba. Hasil penelitian menunjukkan bahwa kelimpahan fitoplankton berkisar antara 216-68.319.716 sel/m 3 . Komposisi fitoplankton terdiri dari 35 genus dari empat kelas, yaitu Cyanophyceae, Chlorophyceae, Bacillariophyceae, dan Dinophyceae. Cyanophyceae merupakan kelas fitoplankton yang dominan berdasarkan komposisi kelimpahannya (>40%). Struktur komunitas fitoplankton di Danau Toba didominasi oleh Anabaena.Kata kunci: danau toba, fitoplankton, struktur komunitas ABSTRACT Lake Toba is the largest lake in Indonesia, located in the Province of North Sumatra. Lake Toba is used to aquaculture, agricultural, tourism, and residential areas. These activities will produce organic and anorganic matter that can affect water quality and can cause eutrophication. Some indicators of eutrophication are an increase in phytoplankton biomass and changes in phytoplankton community structure. The aim of this study was to describe the phytoplankton community structure in Lake Toba. This study was conducted on 2024 October 2014 at 23 stations around the Samosir Island, Lake Toba. The results showed that the phytoplankton abundance ranged 216-68.319.716 cells/m 3 . The phytoplankton composition consists of 35 genera from four classes: Cyanophyceae, Chlorophyceae, Bacillariophyceae, and Dinophyceae. Cyanophyceae is a dominant phytoplankton groups based on the composition of abundance (>40%). Structure of phytoplankton communities in Lake Toba dominated by Anabaena.

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Calpain-1 gene (CAPN1) produces an calpain enzyme controlling structure of meat protein and tenderness. The aims of this study were to identify Single Nucleotide Polymorphism (SNP) in exon 5 and 6 of CAPN1 gene and its associate with carcass and meat characteristic traits in bali cattle. A total of 48 bali cattles from BPTU-HMT Bali Cattle, Bali Province were used in the research. SNP in exon 5 and 6 of CAPN1 gene were identify with direct sequencing using MEGA 5 program. Analysis of polymorphism was conducted by PopGen 1.32 software to identify frequencies of genotype, allele and Hardy-Weinberg equilibrium. The association of CAPN1 gene genotype with carcass and meat characteristic traits was analyzed using Generalized Linear Model (GLM) procedure of SAS. Sequencing analysis at exon 5-6 of CAPN1 gene in Bali cattle resulted in eight polymorphic SNPs. They are c.3669T>C, c.3854G>A, c.3881T>C, c.3899C>T, c.3908C>G, c.4002C>A, c.4021G>T and c.4037A>C. The SNPs c.3669T>C, c.3854G>A and c.3899C>T were significantly (P<0.05) associated with rump thickness (RT), rump fat thickness (RFT) and marbling score (MS), while SNP c.4037A>C was not significantly associated with carcass and meat characteristic traits. The SNPs were significantly associated with carcass and meat characteristic traits namely c.3669T>C, c.3854G>A and c.3899C>T. Those SNPs may be used as candidate marker for Marker Assisted Selection (MAS) in bali cattle.

Abstract. Pratiwi NTM, Imran Z, Ayu IP, Iswantari A, Wulandari DY. 2020. The phosphorus load and the variation of the trophic states of Cirata Reservoir (West Java, Indonesia) from 1988 to 2017. Biodiversitas 21: 4176-4183. Cirata Reservoir was constructed in 1987 between Saguling and Jatiluhur Reservoirs; these are the three man-made cascading lakes in West Java, Indonesia. Cirata Reservoir has been used for floating cage aquaculture activities. The high organic content from the remains of the fish pellets raised the phosphorus (P) load, resulting in the eutrophication of the reservoirs. This research was aimed to assess the P load and the variation of the trophic states of the reservoir from year 1988 to 2017. The trophic states and the nutrients’ conditions of the water were determined using Myxophycean Index. Four groups of phytoplankton were found in the reservoir during observation: Cyanophyceae, Chlorophyceae, Bacillariophyceae, and Dinophyceae. In addition, one group was found in a smaller number of observations: Eugolenophyceae. Although the community structure of the phytoplankton has changed, the Cyanophyceae was always dominant in response against the condition of nutrients, especially P. The P load is closely related to the number of floating cages in the reservoir. This evidence showed that Cirata Reservoir tended to be relatively eutrophic. In general, despite that the P load tended to fluctuate, the trophic states of Cirata Reservoir remained dynamic in relatively high conditions; showed by the oligo-mesotrophic state during its first year of operation, then increased to eutrophic and hypertrophic by the next decade. Although the P load tended to decrease, it remains in the eutrophic condition in the recent time.