Judul: Plankton Community Structure in Bojonegara Beach and Surrounding Waters, Banten Bay
Abstrak: Teluk Banten mendapat tekanan dari industri dan penambangan pasir. Salah satu daerah yang banyak dimanfaatkan adalah Kecamatan Bojonegara. Tekanan ini dapat memicu perubahan kualitas perairan. Perubahan parameter fisika dan kimia dapat memengaruhi kehidupan biota akuatik, salah satunya plankton. Penelitian ini bertujuan menganalisis keterkaitan keberadaan plankton dengan parameter fisika dan kimia perairan. Penelitian ini dilakukan selama tiga bulan, mulai dari Oktober hingga Desember 2019 pada enam stasiun. Penelitian menunjukkan bahwa hasil Analisis Komponen Utama (PCA) membentuk dua hingga tiga kelompok kondisi perairan yang dicirikan oleh keberadaan Bacillariophyceae, Cyanophyceae, Dinophyceae, Chrysophyceae, dan Chlorophyceae. Biplot PCA zooplankton membentuk dua kelompok, yaitu protozoa dan rotifera. Berdasarkan struktur komunitas yang terbentuk pada musim hujan terlihat bahwa plankton masih dapat tumbuh dengan baik pada lokasi dan waktu pengamatan. Struktur komunitas fitoplankton dan zooplankton di perairan Bojonegara mencerminkan kondisi yang relatif kurang stabil, yang dipengaruhi oleh kondisi salinitas dan fosfat total., Banten Bay is under pressure from industry and sand mining. One area that is widely used is Bojonegara. This pressure can trigger changes in water quality. Changes in physical and chemical parameters can affect the life of aquatic biota, one of which is plankton. This study aims to analyze the relationship between the presence of plankton with physical and chemical parameters of the waters. This research was conducted for three months, from October to December 2019 at six stations. The research shows that the results of PCA form two to three groups of water conditions characterized by the presence of Bacillariophyceae, Cyanophyceae, Dinophyceae, Chrysophyceae, and Chlorophyceae. Biplot PCA zooplankton form two groups, namely protozoa and rotifers. Based on the community structure formed during the rainy season, it shows that plankton still grow well at the location and time of observation. The community structure of phytoplankton and zooplankton in Bojonegara waters reflects a relatively unstable condition, which is influenced by conditions of total salinity and phosphate.
Keyword: Bojonegara, Plankton, Struktur komunitas, Teluk Banten

Judul: Zooplankton Community Structure in Banten Bay to Describe the Health of the Aquatic Environment
Abstrak: Perairan Teluk Banten merupakan wilayah perairan yang dipengaruhi oleh berbagai aktivitas seperti kegiatan industri maupun berbagai aktivitas manusia sehingga dapat dikhawatirkan dapat menyebabkan penurunan kondisi perairan serta perubahan komposisi dan kelimpahan zooplankton. Penelitian ini bertujuan untuk menganalisis kondisi perairan Teluk Banten berdasarkan struktur komunitas zooplankton untuk menggambarkan kesehatan lingkungan perairan. Pengambilan contoh dilaksanakan pada bulan Oktober hingga Desember 2021, meliputi19 stasiun di muara Sungai Berung, muara Sungai Cibanten, muara Sungai Pamong, serta 16 stasiun di perairan laut. Parameter kualitas air yang diukur meliputi suhu, salinitas, kecerahan, dan klorofil-a. Analisis data meliputi kelimpahan zooplankton, indeks keanekaragaman, keseragaman, dan dominansi. Sebaran kelimpahan zooplankton dianalisis menggunakan Surfer 16 (Golden Software). Hubungan klorofil-a dan zooplankton dianalisis menggunakan regresi linear. Zooplankton yang ditemukan selama penelitian terdiri dari 29 genera dan 1 stadia. Zooplankton didominasi oleh Copepoda dan organisme yang mendominasi secara keseluruhan adalah krustasea Nauplius stadia. Kelimpahan zooplankton di perairan Teluk Banten berkisar 13,47–305,09 ind/L. Persebaran zooplankton lebih tinggi di area dekat pantai dan semakin rendah ke arah sisi luar teluk. Struktur komunitas zooplankton memiliki keanekaragaman rendah, keseragaman besar, dan dominansi rendah-sedang. Kelimpahan zooplankton berkorelasi signifikan dengan klorofil-a., Banten Bay is estuary that are affected by various human activities such as industrial and non-industrial activities, which can cause concerns about the decline in water quality conditions and changes in the composition and abundance of zooplankton. This research aims to analyze estuary conditions based on the structure of the zooplankton community to describe the health of the aquatic environment. Sampling and measurements were carried out from October to December 2021 at 19 stations, including the river mouth of Berung River, Cibanten River, Pamong River, and 16 other sea sites stations. Water quality parameters measured include temperature, salinity, water clarity, and chlorophyll-a. Data analysis includes zooplankton species abundance, diversity index, uniformity and dominance. The distribution of zooplankton abundance was analyzed using Surfer 16 (Golden Software). The relationship between chlorophyll-a and zooplankton was analyzed using linear regression. The zooplankton found during the research consisted of 29 genera and 1 stage. Zooplankton community was dominated by Copepods and the Nauplius of Crustacea dominates overall community. The abundance of zooplankton in the Banten Bay ranges from 13.47–305.09 ind/L. The distribution of zooplankton near the coast tends to be higher and lower towards outer side of the bay. The zooplankton community structure has low diversity, great uniformity, and low - medium dominance. The relationship between chlorophyll-a and zooplankton shows that zooplankton abundance can be influenced by chlorophyll-a.
Keyword: zooplankton, abundance, structure community, Banten Bay

Judul: Construction of Strongly Optimal Binary Linear Code with Minimum Distance 9 and 11
Abstrak: A binary linear code of length n over q F is a subspace of n q F . A code has three parameters that attached to it, namely length, dimension, and minimum distance. A code with length n, dimension k and minimum distance d is often called [n, k, d ]-code. Usually, when two parameters are given, then we want to find a code that has the best value for the last parameter. Based on Gilbert- Varshamov bound, if a [n, k, d ]-code exists and can not be expanded, we call it a strongly optimal code. In this paper, we construct strongly optimal code with minimum distance 9 and 11. In constructing the code, we created a theorem and algorithm based on Gilbert-Varshamov bound before we implement the algorithm to MAPLE programming language. Because of computational limitations, the program can only construct up to k = 10 for d = 9 and k = 12 for d = 11.
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