Judul: Community Structure of Plankton in Bojonegara Coastal Area, Banten Bay
Abstrak: Perairan pantai Bojonegara mendapat tekanan antopogenik yang tinggi melalui kegiatan industri, pemukiman, dan pembangunan infrastruktur. Tekanan antropogenik tersebut dapat memberikan dampak buruk bagi ekosistem perairan. Penelitian ini bertujuan menganalisis struktur komunitas plankton di wilayah perairan pantai Bojonegara. Penelitian dilakukan pada Bulan Januari, Februari, Agustus, September, dan Oktober 2020 pada 6 stasiun pengambilan data. Analisis data meliputi kelimpahan, indeks keanekaragaman, keseragaman, dominansi, regresi linear, principle component analysis, dan indeks similaritas Bray-Curtis. Parameter perairan yang mendukung kehidupan plankton di Bojonegara adalah salinitas, pH, nitrat, dan fosfat. Hasil penelitian menunjukkan bahwa fitoplankton didominasi oleh Bacillariophyceae dan Cyanophyceae, sedangkan zooplankton didominasi oleh Malacostraca dan Ciliata. Kelimpahan fitoplankton berkisar antara 3,0x10^5 – 8,7x10^5 sel/L, sedangkan zooplankton berkisar antara 2,8x10^4 – 9,9x10^4 ind/L. Plankton memiliki indeks keanekaragaman sedang, indeks keseragaman sedang, dan tidak terjadi dominansi. Struktur komunitas plankton menunjukkan bahwa perairan ini mendapat tekanan ringan dari lingkungan., Bojonegara coastal waters are subject to high anthropogenic pressure through industrial activities, residences, and infrastructure development. This anthropogenic pressure can harm aquatic ecosystems. This study aimed to analyze the plankton community structure at Bojonegara coastal area. This study conducted in January, February, August, September, and October 2020 at six data collecting stations. Data analysis included abundance, diversity, evenness, dominance, linear regression, principle component analysis, and Bray-Curtis similarity index. Water parameters show that salinity, pH, nitrate, and phosphate support plankton life in Bojonegara. Study result showed that phytoplankton are dominanted by Bacillariophyceae and Cyanophyceae, while zooplankton are dominated by Malacostraca and Ciliata. Phytoplankton abundance varied 3,0x10^5 – 8,7x10^5 cells / L, while zooplankton abundance varied 2,8x10^4 - 9,9x10^4 ind / L. Plankton has moderate diversity index, moderate evenness index, and no species dominance. The plankton community structure shows that Bojonegara waters are receiving light pressure from the environment.
Keyword: Bojonegara, community structure, plankton

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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