Judul: The Relationship between Macrozoobenthos Community Structure and Water Quality in Domas Coastal Waters, Banten Bay
Abstrak: Aktivitas yang terjadi di sekitar Pantai Domas dapat berpotensi menyebabkan perubahan kualitas perairan. Organisme makrozoobentos dapat digunakan sebagai tanda adanya gangguan pada ekosistem perairan karena kepekaannya yang tinggi terhadap perubahan kualitas air. Penelitian ini bertujuan untuk menganalisis struktur komunitas makrozoobentos yang berasosiasi dengan kondisi kualitas air dan sedimen Perairan Pesisir Domas Teluk Banten. Penelitian dilakukan mulai Agustus 2021 hingga Januari 2022 di enam stasiun. Pengambilan sampel makrozoobentos dilakukan dengan mengambil sedimen menggunakan Van Veen Grab sebanyak tiga kali ulangan. Analisis dilakukan untuk memperkirakan kepadatan makrozoobentos, indeks keanekaragaman, indeks keseragaman, indeks dominasi, tipe substrat, indeks similaritas, dan hubungan kualitas air dengan kepadatan makrozoobentos menggunakan CCA. Berdasarkan hasil penelitian, diperoleh enam kelas dan 52 genus dan paling banyak ditemukan kelas Bivalvia dan Gastropoda. Kepadatan total tertinggi terjadi pada Stasiun 5 (bulan Januari) yaitu sebesar 2151 ind/m2 dan terendah pada Stasiun 3 (bulan Agustus) yaitu sebesar 18 ind/m2. Berdasarkan nilai indeks keanekaragaman, kemerataan dan dominansi, perairan pantai ini memiliki keanekaragaman berkisar dari rendah sampai sedang, dengan dominan makrozoobentos pada waktu dan lokasi tertentu. Secara umum, kualitas air di Perairan Pantai Domas masih layak untuk kehidupan makrozoobentos., Activities that occur around Domas Beach can potentially cause changes in water quality. Macrozoobenthos organisms can be used as a sign of disturbance in aquatic ecosystems because of their high sensitivity to changes in air quality. This study aims to analyze the macrozoobenthic community structure associated with water quality and sediment conditions in the Domas Coastal Waters of Banten Bay. The research was conducted from August 2021 to January 2022 at six stations. Macrozoobenthos sampling was carried out by taking sediments using the Van Veen Grab with three replicates. Analysis was performed for makrozoobenthos density, diversity index, evenness index, dominance index, substrate type, index similarity, and the relationship between air quality and macrozoobenthos density using CCA. Based on the results of the study, six classes and 52 genera were obtained, and the most common classes were Bivalvia and Gastropods. The highest total density occurred at Station 5 (January) which was 2151 ind/m2, and the lowest was at Station 3 (August), which was 18 ind/m2. Based on the value of the carbon index, evenness, and dominance, these coastal waters have a tendency that varies from low to moderate, with macrozoobenthos being dominant at certain times and locations. In general, the air quality in the Domas coastal waters is still suitable for macrozoobenthos life.
Keyword: aquatic environment, diversity, macrozoobenthos

Judul: Struktur Komunitas Makrozoobentos dan Keterkaitannya dengan Kualitas Air di Perairan Teluk Banten
Abstrak: Tingginya aktivitas antropogenik di kawasan pesisir Teluk Banten berpotensi menurunkan kualitas perairan akibat masuknya bahan-bahan organik dan anorganik. Penurunan kualitas air tersebut akan berdampak terhadap kehidupan biota, salah satunya makrozoobentos. Penelitian ini bertujuan menganalisis struktur komunitas makrozoobentos dan keterkaitannya dengan kualitas air di Teluk Banten. Penelitian dilakukan selama enam bulan, sejak bulan September 2022 hingga Februari 2023 dengan enam titik stasiun pengamatan. Metode yang digunakan terdiri dari analisis kualitas air secara insitu dan eksitu berupa sampel makrozoobentos yang diambil menggunakan Ekman Grab, parameter kualitas air, dan substrat. Analisis data yang dilakukan terdiri dari kepadatan, keanekaragaman, keseragaman, dominansi, tipe substrat, analisis similaritas, dan analisis komponen utama. Makrozoobenthos yang diperoleh terdiri dari enam kelas, yaitu Bivalvia, Gastropoda, Polychaeta, Scapopoda, Malacostraca, dan Echinoidea. Kepadatan makrozoobentos tertinggi pada musim kemarau di bulan September. Indeks keanekaragaman yang diperoleh terkategori tinggi dengan keseragaman dan dominansi yang rendah. Kualitas air yang paling berpengaruh bagi makrozoobentos di Teluk Banten, yaitu DO dan suhu., The high anthropogenic activities in the coastal area of Banten Bay have potential to reduce water quality due to the load of organic and inorganic materials. The decrease in water quality will have an impact on biota life, one of which is macrozoobenthos. This study aims to analyze the structure of the macrozoobentos community and its relationship with water quality in Banten Bay. The study was conducted for six months, from September 2022 to February 2023 with six observation stations. The method used consists of in situ and ex situ water quality analysis in the form of macrozoobenthos samples taken usingEkman Grab, water quality parameters, and substrate. The data analysis carried out consisted of density, diversity, uniformity, dominance, substrate type, similarity analysis, and principal component analysis. The macrozoobenthos obtained consist of six classes, namely Bivalves, Gastropods, Polychaeta, Scapopoda, Malacostraca, and Echinoidea. The density of macrozoobenthos was highest at dry season in September. The diversity index is categorized as high with low uniformity and dominance. The most influential water quality for macrozoobentos in Banten Bay is DO and temperature.
Keyword: makrozoobentos di Teluk Banten, kualitas air, struktur komunitas, Teluk Banten

Judul: Konstruksi Hukum Grup Kurva Eliptik Atas F3m
Abstrak: Elliptic curves upon F3m can be divided in two cases, i.e. supersingular and nonsupersingular case. Based on group laws on elliptic curves, a new arithmetic upon F3m can be formulated as an addition process of two random points on the curve. This addition process can then be applied to the ElGamal algorithm.
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