Judul: Struktur Komunitas Makrozoobentos dan Kecacatan Larva Chironomid di Hulu Sungai Cisadane Bogor Jawa Barat
Abstrak: Anthropogenic activities on river ecosystems will cause river pollution. Pollution in the river resulted in a change of aquatic organisms communities. Biological indicators are used to support the physical and chemical indicators in evaluating the ecological status of waters. Macrozoobenthos is one of biological indicator that currently being developed. It because biological indicator has many advantages include widely distributed, sedentary life, long life cycle, the sampling method is easy and inexpensive, and identification keys are available. Chironomid larvae are macrozoobenthos groups that live in the sediment. Disability of Chironomid larvae is caused heavy metals contaminated, one of which Hg. Cisadane River has great benefits for the community in Bogor, Tangerang, and Jakarta area. The benefits are source of drinking water, fisheries, and sand mining. Human activities around the upstream of Cisadane River, such as household waste disposal, agriculture, animal husbandry, and Hg waste from traditional gold mining (gurandil) led to a decline in water quality. Research conducted by Sudarso (2009) between 2006-2008, upstream of Cisadane River showed that turbidity and conductivity increased from upstream to downstream (3,83 to 31,74 and 0,034 to 0,087μS/cm). Heavy metal (Hg) contamination was highest in Curug Bitung area. Hg in water is 6,89 μg/L and Hg sediment 16,62 μg/L. This study was aimed to: 1). Describe the status of waters based on the parameters of physics, chemistry, and biology; 2). Assessing the impact of changes in water quality (organic matter and Hg) on macrozoobenthos abundance in the upstream of Cisadane River and 3). Revealed Chironomid larvae disability found in the upstream of Cisadane River. The research was conducted in January-March 2012 at four locations in the upstream of Cisadane River, covering Cikuluwung (no anthropogenic activity), Cisarua (household waste disposal and mining of traditional gold), Curug Bitung (household waste disposal, agriculture, and mining of traditional gold), and Lukut (household waste disposal and mining of traditional gold). Water quality measurements include temperature, flow velocity, DO, TDS, conductivity, pH, TOM, organic sediment, and the amount of Hg in waters and sediments. Macrozoobenthos sampling system was implemented based on rapid assessment and a kick net was used to take macrozoobenthos. Data analysis of this study include Shannon Wiener Index, Evenness Index, Taxa Richness, Signal Index, EPT Index, one way ANOVA and Turkey test, Pollution Index, and Hg in Sediment Pollution Index. Status of waters in the upstream of Cisadane River based on Pollution Index and Heavy Metal Pollution Index (Hg) in sediments polluted relatively low, based on EPT Index is fair to moderate polluted, and Signal Index from low to moderate polluted. Water quality which affects the macrozoobenthos abundance using one way ANOVA analysis continued by Tukey's test were pH, temperature, TDS, and conductivity which covers an area Cikuluwung (ST 1) and Curug Bitung (ST 3) also ST 1 and Lukut (ST 4). Chironomid larvae were found in the upstream of Cisadane River which have disability at the mandible and mentum (Polypedilum and Orthocladinae subfamily) is caused by the presence of organic matter and Hg pollution.
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Judul: Struktur komunitas makrozoobenthos di sepanjang aliran sungai Cisadane, Jawa Barat
Abstrak: Sungai Cisadane adalah salah satu sungai yang mengalir melewati kota Bogor. Hulu sungai ini terletak di daerah Caringin, Kabupaten Bogor, dan bermuara ke Tanjung Burung, Tangerang. Padatnya pemukiman penduduk dan industri di sepanjang aliran Sungai Cisadane diduga dapat menurunkan kualitas lingkungan sungai tersebut dan dapat mempengaruhi kehidupan organisma yang ada di dalamnya, misalnya zoobenthos. Zoobenthos memiliki kepekaan yang berbeda-beda terhadap berbagai jenis bahan pencemar dan memliki kemampuan migrasi yang terbatas. Oleh karena itu zoobenthos sangat cocok di gunakan sebagai indikator biologis untuk mempelajari kualitas lingkungan perairan mengalir yang mengalami pencemaran. Penelitian ini bertujuan untuk mempelajari struktur komunitas makrozoobenthos di sepanjang aliran Sungai Cisadane dengan beberapa parameter fisika dan kimia perairan sebagai data penunjang. Penelitian dilaksanakan selama satu bulan mulai tanggal 8 Oktober sampai 31 Oktober 1998 di sepanjang aliran Sungai Cisadane, pada 5 stasiun pengamatan. Stasiun 1 dan 2 mewakili daerah hulu, Stasiun 3 dan 4 mewakili daerah tengah dan Stasiun 5 mewakili daerah hilir. Pengambilan contoh makrozoobenthos dilakukan sebanyak 4 kali pengamatan sedangkan pengambilan contoh kualitas air untuk parameter kecepatan arus, suhu dan pH dilakukan sebanyak 4 kali; kekeruhan, TSS dan ammonia 1 kali; DO dan BOD dilakukan sebanyak 2 kali. Alat dan metode yang digunakan dalam pengukuran parameter-parameter fisika dan kimia ini mengacu pada APНА (1989). Alat yang digunakan untuk mengambil contoh makrozoobenthos adalah surber ...
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Judul: Konstruksi aritmetika kurva eliptik F(2m) supersingular dan non-supersingular untuk skema kunci publik ElGamal
Abstrak: Algoritme ElGamal adalah salah satu algoritme kunci publik dengan aritmetik modular p yang mempunyai struktur grip siklik Z(p). Tingkat keanaman algoritme ini terletak pada pemecahan masalah logaritme diskret dari Z(p). Akan tetapi, tingkat keamanan tadi tahun ke tahun semakin menurun yang disebabkan kemampuan pemecahan algoritme diskret semakin meningkat. Untuk memenuhi tingkat keamanan yang memadai dibutuhkan p yang cukup besar yang menyebabkan proses enkripsi dan dekripsi menjadi lambat.
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