Judul: Karakteristik Populasi Panenan (Amyda cartilaginea) di Kabupaten Sambas dan Kabupaten Ketapang Kalimantan Barat
Abstrak: Indonesia merupakan salah satu negara penghasil labi-labi (Amyda cartilaginea) di dunia. Penangkapan labi-labi di Indonesia dilakukan untuk memenuhi kebutuhan dalam negeri (konsumsi dan pet) dan untuk ekspor (Mardiastuti & Soehartono 2003). Di Indonesia status konservasi labi-labi belum dilindungi undang-undang, tetapi secara Internasional, spesies tersebut masuk ke dalam Appendix II CITES (CITES 2010) dan dikategorikan vulnerable (rentan) pada Red Data Book IUCN (IUCN 2010). Lokasi tangkapan labi-labi dari alam yang utama adalah di Kalimantan dan Sumatera. Kalimantan Barat merupakan salah satu daerah pemasok labi-labi, pada tiga tahun terakhir (2007 – 2009) mendapat kuota yang cukup tinggi yaitu 4.000 ekor setelah Sumatera Utara (rata-rata 9.250 ekor) dan Kalimantan Timur sebanyak 5.000 ekor pertahun (Ditjen PHKA 2007; 2008; dan 2009). Di Kalimantan Barat, berdasarkan informasi dari pengumpul besar yang merangkap eksportir diketahui bahwa dua lokasi yang merupakan kantong tangkapan labi-labi adalah Kabupaten Ketapang dan Kabupaten Sambas. Penelitian ini dilakukan karena saat ini tingkat penangkapan labi-labi dari alam cukup tinggi, sementara data dan informasi tentang kondisi populasi di alam masih sangat terbatas. Lokasi penelitian adalah di Kabupaten Sambas dan Kabupaten Ketapang untuk tingkat pemancing dan pengumpul, dan di Pontianak untuk tingkat eksportir. Pengambilan data dilakukan ± 2 bulan yaitu dari bulan Maret 2010 sampai dengan bulan April 2010. Tujuannya adalah untuk (1) mengetahui parameter demografi (seks rasio, mortalitas dan kelas umur) populasi panenan di tingkat pemancing, pengumpul dan eksportir (2) mengetahui parameter morfometri populasi panenan (3) menduga populasi alami di lokasi-lokasi tangkapan dan (4) fluktuasi tangkapan per periode tangkap.
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Judul: Karakteristik Habitat Tangkap dan Parameter Demografi Populasi Panenan Labi-labi Amyda cartilaginea (Boddaert 1770) di Provinsi Kalimantan Tengah.
Abstrak: Amyda cartilaginea (Boddaert 1770) is one of harvested turtle species in Indonesia, mainly for consumption purpose in oriental countries. In order to prevent over-exploitation and the declining of the population, harvesting has been limited by quota. However, there is still too few supporting data, that can be used as a basis to determine the quota. The research was aimed to identify characteristics of catchment habitat, and also the demography and morphometric parameters of A. cartilaginea in Central Kalimantan Province. The result showed that harvested population of A. cartilaginea was dominated by adult females within the range weight of 3 – 5 kilograms of body mass. Two statistical tests were applied to describe the characteristic of catchment habitat of A. cartileginea in Central Kalimantan. Chi-square test on the types of land cover suggested that A. cartileginea catchment habitat had a specific condition. Index Neu showed that the catchment habitat were swamp and river (w=10,17; w=6,28 respectively). Binary logistic regression was used to construct a model which explained the dominant variables influencing the number of A. cartileginea at a certain point of habitat. There were four biophysical variables that significantly drove the number of catchment of A. cartileginea, and all were negatively correlated with number of catchment.
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Judul: Hamiltonian formulation for linear waves motion in two layers fluid
Abstrak: The surface wave could be considered as a wave that separates two fluids, namely water and air. Based on this assumption, it is introduced the interfacial wave, a wave between two layers of fluid with different density. The formulation of interfacial waves motion begins with deriving the base equation of irrotational ideal fluid. Furthermore, according to irrotational fluid assumption, the base equation can be stated in velocity potential. In this derivation, the fluids domain is assumed to be restricted by rigid lid boundary conditions, both at the upper and lower limit. Therefore, the interfacial waves motion can be explained in a hamiltonian formulation. In the hamiltonian formulation, total energy is defined as the sum of kinetic and potential energy. The hamiltonian system is obtained from reduction of kinetic energy by using the Dirichlet Neumann Operator. The resulted kinetic energy equation is nonlinear. Therefore, this form is linearized by first part of the Taylor expansion. This linearization gives a dispersion relation of linear wave. Based on this dispersion relation, the phase speed of the linear wave depends on the density ratio of the two layers fluid.
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