Judul: Association of Macroalgae with Seagrass on Pari Island, Thousand Islands
Abstrak: ABSTRAK RIZKY MARTHAULINA KRISTIANI. Asosiasi Makroalga dengan Lamun di Pulau Pari, Kepulauan Seribu. Dibimbing oleh ENDANG SUNARWATI SRIMARIANA dan DEA FAUZIA LESTARI. Penelitian ini bertujuan untuk mengetahui kondisi ekologi makroalga dan lamun seperti komposisi spesies, kerapatan, kepadatan, tutupan dan asosiasi makroalga dengan lamun di Perairan Pulau Pari, Kepulauan Seribu. Kawasan Pulau Pari merupakan wawasan ilmu pengetahuan yang masih perlu perencanaan pengembangan lebih lanjut. Di kawasan ini wisatawan dapat mempelajari Ekosistem lamun yang merupakan salah satu ekosistem penting di laut, disamping mangrove dan terumbu karang yang sebagai pendukung kehidupan biota Penelitian ini dilaksanakan, pada Bulan April sampai Mei 2021 bertempat di perairan Pulau Pari, Kepulauan Seribu. Dalam penelitian ini digunakan metode transek kuadrat pada ekosistem lamun. Transek kuadrat yang digunakan adalah berukuran 50 cm x 50 cm dengan melakukan pengambilan sebanyak sepuluh titik dengan tiga kali pengulangan, dengan masing-masing pengambilan mendapatkan tiga puluh data dalam tiga Stasiun yang berbeda. Hasil penelitian menunjukkan bahwa di perairan Pulau Pari ditemukan 8 jenis makroalga yakni : Acanthophora spicifera, Eucheuma cotonii, Eucheuma edule, Gracilaria salicornia, Halimeda opuntia, Hydroclathrus clatratus, Padina minor, Sarggasum polycystum. Sedangkan jenis lamun yang ditemukan ada 3 jenis yakni : Cymodocea serulata, Enhalus acoroides, Thalassia hempricii Kata kunci: Asosiasi, lamun, makroalga, Pulau Pari, Kepulauan Seribu, ABSTRACT RIZKY MARTHAULINA KRISTIANI. Association of Macroalgae with Seagrass on Pari Island, Thousand Islands. Supervised by ENDANG SUNARWATI SRIMARIANA and DEA FAUZIA LESTARI. This study aims to determine the ecological conditions of macroalgae and seagrasses such as species composition, density, density, cover and association of macroalgae and seagrasses in Pari Island Waters, Thousand Islands. The Pari Island area is a scientific insight that still needs further development planning. In this area tourists can enjoy the beauty of the sea and learn about the ecosystem it has. Such as studying seagrass ecosystems which are one of the important ecosystems in the sea, in addition to mangroves and coral reefs which support the life of biota. This research was carried out from April to May 2021 in the waters of Pari Island, Thousand Islands. In this study the quadratic transect method was used in seagrass ecosystems. The quadratic transect used is 50 cm x 50 cm in size by taking ten points with three repetitions, with each retrieval getting thirty data from three different stations. The results showed that in the waters of Pari Island there were 8 types of macroalgae namely: Acanthophora spicifera, Eucheuma cotonii, Eucheuma edule, Gracilaria salicornia, Halimeda opuntia, Hydroclathrus clatratus, Padina minor, Sarggasum polycystum While there are 3 types of seagrass found namely: Cymodocea serulata, Enhalus acoroides, Thalassia hempricii Keywords : Association, macroalgae, Pari Island, Seribu Island, seagrass
Keyword: Association, macroalgae, Pari Island, Seribu Island, seagrass

Judul: Crustacean and Seagrass Association on Coastal Waters Pramuka Island, Thousand Islands, DKI Jakarta
Abstrak: Lamun merupakan tumbuhan berbunga (Angiospermae) yang mampu hidup dan beradaptasi di perairan dengan salinitas yang tinggi. Ekosistem lamun berperan penting bagi kehidupan biota-biota di laut dangkal. Krustasea termasuk salah satu kelompok biota yang memanfaatkan padang lamun sebagai tempat berlindung, mencari makan serta memijah. Penelitian ini bertujuan menganalisis hubungan antara krustasea dan lamun di perairan pesisir Pulau Pramuka, Kepulauan Seribu, DKI Jakarta. Pengambilan data dilakukan dari tanggal 3-7 Februari 2020 pada 2 stasiun. Lamun yang ditemukan sebanyak 4 jenis, yaitu Enhalus acoroides, Cymodocea serrulata, Thalassia hemprichii, dan Halophila ovalis dengan kerapatan tertinggi dijumpai pada jenis Cymodocea serrulata di kedua stasiun. Dari hasil CA sebaran lamun dan krustasea berdasarkan stasiun, terdapat 2 kelompok asosiasi krustasea dan lamun. Kelompok I mengasosiasikan krustasea jenis Calappa depressa, Scylla serrata, Pagurus granosimanus, Ocypode occidentalis, dan Palaemon serenus dengan lamun jenis Enhalus acoroides dan Cymodocea serrulata. Pada kelompok II, Clibanarius cruentatus, Clibanarius vittatus, dan Pagurixus handrecki berasosiasi dengan Thalassia hemprichii., Seagrass is a flowering plant (Angiosperms) that can live and adapt in high saline waters, thus forming coastal ecosystem with vital roles for diverse marine biota. Crustaceans are a group of biota that use seagrass beds as nursery, feeding, and spawning ground. This study aimed to analyze the relationship between crustaceans and seagrass in coastal waters of Pramuka Island, Kepulauan Seribu, DKI Jakarta. Data collection was carried out from 3-7 February 2020 at two stations. There were four types of seagrass observed: Enhalus acoroides, Cymodocea, Thalassia hemprichii, and Halophila ovalis. Cymodocea serrulata had the highest density at both stations. From CA results, seagrass and crustacean distribution formed two groups of association. In group I, crustaceans of Calappa depressa and Scylla serrata, Pagurus granosimanus, Ocypode occidentalis, and Palaemon serenus were associated with seagrass Enhalus acoroides and Cymodocea serrulata. In group II, Clibanarius cruentatus, Clibanarius vittatus, and Pagurixus handrecki were associated with Thalassia hemprichii.
Keyword: seagrass, crustaceans, habitat, association, Pramuka Island

Judul: Penentuan Nilai Eigen dan Vektor Eigen dari Matriks Tridiagonal 2-Toeplitz dengan Pendekatan Polinomial Chebyshev
Abstrak: The eigenvalues and eigenvectors of a matrix can be determined by finding its characteristic polynomials. The characteristic polynomials of a tridiagonal 2-Toeplitz matrix is shown to be closely connected to polynomials which satisfy the Chebyshev recurrence relationship. If the order of the matrix is odd, then the eigenvalues are found explicitly in terms of the Chebyshev zeros and the eigenvectors are found in terms of the polynomials satisfying the recurrence relationship. For even ordered matrices, the situation is more complicated. The problem in these cases is that although the Chebyshev recurrence formula is still applied, its initial values are not generating Chebyshev polynomials
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