Judul: Ecological, Genetic, and Conservation Studies of Tanimbar Corella (Cacatua goffiniana) in Tanimbar Islands, Maluku
Abstrak: Indonesia is a country with high biodiversity rate, whether at the ecosystem, species, and genetic levels. One of them is the diversity of bird species of around 1883 species. Birds are very popular as pets, more than 2600 species of wild birds are traded internationally, dominated by Passeriformes and Psittaciformes. Indonesia has two families of Psittaciformes, namely Cacatuidae (seven species) and Psittaculidae (81 species), including the Tanimbar Cockatoo (Cacatua goffiniana) which is an endemic bird in the Tanimbar Islands of Maluku. Conservation activities carried out by the government for C. goffiniana still a series of challenges such as habitat loss, population decline, illegal trade, and law enforcement. Various studies are still needed to obtain comprehensive scientific data related to the species and its ecology. This study of Cacatua goffiniana aims to (a) obtain ecological data consisting of habitat, distribution, diet, breeding, and its interactions with other bird communities, (b) generate data on genetic characteristics consisting of mitochondrial genome structure, genetic diversity, and population mapping of C. goffiniana to trace the origin of confiscated birds and estimate their range, and (c) gather data on conservation implementation, potential legal utilization and threats to its sustainability. This study is expected will be of use as a scientific basis in the conservation strategies and policies so that they can be implemented appropriately to preserve C. goffiniana in Tanimbar Islands, Maluku. Direct observations and interviews to obtain ecological data consisting of distribution, habitat, diet, nest trees, bird species diversity and associations with other bird communities. The distribution of C. goffiniana was recorded in Yamdena, Selaru, Larat, Sera, and Molu (Tanimbar Islands, Maluku). Land cover classification analysis using the supervised classification method with Erdas Imagine 2014 on Landsat 8 OLI image data at path/row 106/065 and path/row 106/066. Land cover classification analysis resulting in six categories: forest, dry land and open land agriculture, mixed plantations, mangrove, built-up land, and wetland. The forest classification represents the largest percentage of land cover in Tanimbar Islands, especially on Yamdena, Waliaru, Selu, Molu, and Maru Island. Foraging, nesting and roosting activities were carried out in forest, plantation and open land habitats. Observations in forest and openland habitats identified 27 food species consumed by C. goffiniana in Tanimbar Islands. A total of six main food species in the forest are Canarium indicum, Ficus variegata, Manilkara fasciculata, Osmoxylon insidiator, Maranthes corymbosa, and Shorea polysperma. The breeding period of C. goffiniana occurs between August-December, with 20 nest trees recorded consisting of seven species, namely Canarium indicum, Pometia pinnata, Alstonia scholaris, Maranther corymbosa, Instia bijuga, Sterculita foetida, and Manilkara fasciculata. Observations made on Yamdena, Selaru, Vaimar, and Larat Island recorded 92 species of birds. The diversity of birds in various habitat types allowed for interaction between communities, particularly competing or sharing for food, nesting, and roosting sites. The genetic study of C. goffiniana analyzed the structure and composition of the mitochondrial genome (mitogenome), as well as genetic diversity using samples from Yamdena Island, Larat Island, Selaru Island, and confiscated BBKSDA East Java. Mitogenome analysis obtained a total nucleotide length of 19.083 bp, the structure consists of
Keyword: confiscated,  conservation, genetic diversity, habitat, Tanimbar Corella

Judul: Populasi dan Habitat Kakatua-Kecil Jambul-Kuning di Bentang Alam Mbeliling Bagian Barat, Kabupaten Manggarai Barat, Nusa Tenggara Timur
Abstrak: Cacatua sulphurea parvula or yellow-crested cockatoo were spread distributed at Sunda Kecil Archipelago, Nusa Tenggara, except at Sumba Island. This species amount in the nature is very small, caused by the illegal hunting and trading. The purpose of this research is to get the information about population and habitat of the cockatoo in Flores, especially at the western part of Mbeliling Landscape. Cocatoo census was conducted by look-down method at vantage points when cockatoo flew passed by. Habitat analysis was carried out with vegetation analysis. The census showed that there were two groups of cockatoo, consisted of 69 cockatoos in Tao hill and 15 cockatoos in Nggoer River. Flight pattern of each group ranged 0-100 meters above the sea level and crossed mangrove forest, savanna, monsoon forest and cultivation plant vegetation. The vegetation analysis resulted Ceiba petandra or silk-cotton tree as the tree that most used by cockatoo and had the highest TIV (Tree Importance Value), 47,48%. Cockatoo’s foods which observed were crown flower (Calotropis gigantea), and Moringa olifera. The population of Cockatoo which observed at western part of Mbeliling Landscape was estimated came from Rinca Island, Komodo National Park. It can be concluded that the location might be only used by rhe cockatoo came from Rinca Island as their daily exploration area for foraging.
Keyword: habitat., ecology, population, Flores, Cacatua sulphurea parvula

Judul: Formulasi Hamilton Untuk Menggambarkan Deformasi Gelombang Soliter Dengan Dasar Tidak Rata Pada Fluida Dua Lapisan
Abstrak: Gelombang internal adalah suatu gelombang yang muncul di bawah permukaan laut sehingga gelombang ini tidak teramati secara kasat mata. Formulasi Hamilton dirumuskan untuk menjelaskan gerak gelombang ini. Dalam hal ini diasumsikan bahwa fluida yang ditinjau terdiri atas dua lapisan dengan masing-masing lapisan memiliki rapat massa yang konstan. Selain itu, diasumsikan pula fluida yang ditinjau berupa fluida tak mampat (incompressible) dan tak kental (invicid). Formulasi Hamilton dilakukan dengan meninjau fluida dua lapisan yang berada pada domain yang dibatasi oleh batas atas yang rata dan batas bawah yang tidak rata. Hamilton (energi total)-nya didefinisikan sebagai penjumlahan antara energi kinetik dan energi potensialnya. Karena energi kinetik tidak secara eksplisit dinyatakan dalam peubah fisis, maka digunakan metode asimtotik untuk menentukan energi totalnya. Dalam hal ini diasumsikan bahwa gelombang interfacial yang ditinjau cukup panjang, dan amplitudo yang cukup kecil. Persamaan Korteweg de- Vries (KdV) diperoleh, jika disumsikan bahwa gelombang interfacial hanya merambat pada satu arah, sedangkan jika gelombang tersebut merambat ke dua arah, diperoleh persamaan Boussinesq.
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