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All Journal Jurnal HIDROPILAR Indonesian Journal of Mollusk
Trijoko
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Agriculture, Biological Sciences & Forestry Biochemistry, Genetics & Molecular Biology Earth & Planetary Sciences Environmental Science

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Penentuan Posisi Titik Tetap Menggunakan Satu Receiver GPSYang Diolah Secara Diferensial dengan Titik Ikat Cors Menggunakan Software, Diolah Secara On-Line, dan Diolah Secara Statistik Hardianto , Budi; Lufti Ibrahim, Ahmad; Sudarman; Trijoko
Jurnal Hidropilar Vol. 1 No. 1 (2015): JURNAL HIDROPILAR
Publisher : Sekolah Tinggi Teknologi Angkatan Laut (STTAL)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (1180.401 KB) | DOI: 10.37875/hidropilar.v1i1.18

Abstract

Pada umumnya, survei geodetik guna penentuan posisi titik tetap sebagai titik ikat dalam survei batimetri, garis pantai, dan detail pantai dilaksanakan menggunakan metode diferensial dengan diikatkan pada titik-titik Kerangka Dasar Geodesi Nasional (KDGN) orde-0 dan orde-1. Ada kemungkinan karena sesuatu hal hanya tersedia satu receiver Global Positioning System (GPS) yang masih bisa berfungsi, sehingga pengadaan titik tetap dengan pengikatan ke KDGN tidak bisa dilaksanakan. Solusi alternatif penentuan posisi titik tetap dapat dilaksanakan dengan pengamatan GPS secara stand-alone. Dalam penelitian ini, pengamatan dilaksanakan menggunakan receiver GPS Trimble 5700 di titik N1.0294 dan HP.090053, kemudian data hasil pengamatan diolah secara diferensial dengan titik ikat Continuously Operating Reference Stations (CORS) menggunakan software Trimble Business Center (TBC) dan diolah secara on-line melalui layanan AUSPOS dan OPUS serta diolah secara statistik posisi absolut. Berdasarkan hasil penelitian ini menunjukkan bahwa ketelitian titik tetap hasil pengolahan secara diferensial dengan titik ikat CORS baik menggunakan software TBC maupun melalui on-line menggunakan layanan AUSPOS dan OPUS mempunyai jarak pergeseran posisi terbesar 46 sentimeter (< 50 sentimeter), sehingga memenuhi syarat sekunder IHO. Titik tetap hasil pengolahan posisi absolut menggunakan metode statistik bisa memenuhi ketelitian + 3 meter.
Diversity of Bivalves in Cengkrong Mangrove Trenggalek, East Java Based on Morphological and Molecular Character Mukhlis, Mukhlis; Niken Satuti Nur Handayani; Trijoko
Jurnal Moluska Indonesia Vol. 8 No. 1 (2024): April 2024
Publisher : Masyarakat Moluska Indonesia

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.54115/jmi.v8i1.75

Abstract

Bivalves in mangrove ecosystem plays an important role in the process of litter decomposition and mineralization of organic matter, especially that are herbivores and detrivor. Bivalves in one ecosystem can be known by looking the morphologic character, while the molecular character can be use to know the genetic variation of species in population. The purpose of this research was to determine species diversity of bivalve, and to understand the morphological and molecular characters of them. Phenetic Similarity analyzed using 109 morphological characters, ISSR 6 ISSR 8 primer. The results were analyzed using MVSP 3.1 (Multi-Variate Statistical Package) program to obtain a dendogram that show similarity of bivalves. Four species of bivalves identified, consisting of Polymesoda Erosa, Meretrix meretrix, Pholas sp., and Glauconome virens. Based on morphological and molecular analysis showed two main clusters with the similarity of 54.8% for morphology and 57.6% for molecular. Based on analysis of morphological and molecular characters, it can be concluded that the diversity of the bivalves in ​​mangrove forests Cengkrong is influenced by morphological structure, meristik, morphometric shell, and the type of habitat.
Co-Authors Hardianto , Budi Lufti Ibrahim, Ahmad Mukhlis Mukhlis Niken Satuti Nur Handayani Sudarman