Judul: Karateristik Habitat dan Beberapa Aspek Reproduksi Kepiting Kelapa (Birgus latro) di Pulau Uta, Propinsi Maluku Utara
Abstrak: Coconut crab (B. latro) is one of crustacea species which has high economic value, but it is considered rare and classified into vulnerable category by the International Union for Conservation of Nature (IUCN). In Indonesia, the status of this animal population has been not exactly identified, but it has tended to decline because of local people consumption and its habitat quality degradation. Regarding importance of the species resources, thus undestanding its biology and ecology aspects can be applied as the proper management stock and effort of preservation. The research was done in Uta Island on May, July and September with the purpose to analyze the habitat characteristic and gonadal maturation of Coconut Crab on that island. The sampling was taken by kuadran method. The parameter which was analized to understand the habitat. Characteristic and its reproduction aspects such as physical – chemical characteristic of soil, gonadal maturation and plant vegetation analysis. The habitat characteristic was analyzed by using cluster analysis. The result analysis showed that the relation of Length – Weight of male crab is W = 1,93 (CP + r)1,17, while the female is W = 1,97 (CP + r)0,97. Each of those sexual species has allometric growth characteristics. The observation showed that the male did not found in TKG I condition but the female can be found on May (30%) and September (25%) of catch. TKG II was mostly found on male which catched on May in South Station (65%), TKG III was mostly found on female which catched on September in West Station (25%) of catched individu. TKG IV (100%) both male and female where mostly found on July. The different of gonadal maturation levels in all catching times showed that gonadal maturation occured different time for broodstock. The smallest crab which is having gonad maturation was found in length of (CP + r) 66,44 mm. The biggest condition factors of male was found on July and decrease on September, while the highest condition factor of female was found on May that decrease on July, but increase again on September. Generally, sex ratio of male and female is 1 : 1 (avoid deviation). The distribution index showed homogen but tend to have random distribution. There is no different on catch both the amount on level of gonadal maturation. Eventhough, there are different habitat characteristic in every station doesn‟t affect to the catch, both the quantity and level of gonad maturity. The habitat condition in all station for coconut crab to support the sustainability of its activities.
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Judul: Ekologi dan biologi populasi sebagai dasar pengelolaan kepiting kelapa (Birgus latro Linn 1767) di Maluku Utara
Abstrak: Kepiting kelapa (B. latro) merupakan salah satu sumberdaya perikanan yang termasuk dalam kelompok hermit crab, famili Coenobitidae dan kelas krustasea. Kepiting kelapa ini memiliki umur panjang sekitar 40-60 tahun. Berdasarkan Permenhut 2008 termasuk dalam kelompok sumberdaya yang masih kekurangan data. Fase larva bersifat planktonik, dan distribusi larva berlangsung pada fase larva ini. Pemanfaatan kepiting kelapa yang tinggi dapat menurunkan stok dan mengganggu kondisi biologi populasinya. Penelitian ini dilakukan untuk menentukan karakteristik habitat kepiting kelapa di Daeo Kabupaten Pulau Morotai, Laigoma Kabupaten Halmahera Selatan dan Fitako Kabupaten Halmahera Utara, menguraikan karakteristik morfometrik kepiting kelapa di Daeo Kabupaten Pulau Morotai, Laigoma Kabupaten Halmahera Selatan dan Fitako Kabupaten Halmahera Utara, menjelaskan hubungan kekerabatan kepiting kelapa dengan menggunakan gen COI dan 18S rRNA di Daeo Kabupaten Pulau Morotai, Laigoma Kabupaten Halmahera Selatan dan Fitako Kabupaten Halmahera Utara, menentukan biologi reproduksi kepiting kelapa di Daeo Kabupaten Pulau Morotai, menentukan distribusi ukuran dan pola pertumbuhan kepiting kelapa di Daeo Kabupaten Pulau Morotai, Laigoma Kabupaten Halmahera Selatan dan Fitako Kabupaten Halmahera Utara, menentukan status stok populasi kepiting kelapa di Daeo, serta menduga kepadatan populasi kepiting kelapa dengan metode tagging di Daeo, Kabupaten Pulau Morotai. Penelitian ini dilakukan di Daeo Kabupaten Pulau Morotai meliputi analisis ekologi, morfometrik, molekuler, reproduksi, pertumbuhan dan estimasi kepadatan populasi dengan menggunakan metode tagging serta di Fitako Kabupaten Halmahera Utara dan Laigoma Kabupaten Halmahera Selatan meliputi analisis ekologi, morfometrik dan molekuler. Hasil penelitian ekologi habitat kepiting kelapa menunjukkan bahwa kondisi habitat di tiga lokasi penelitian cenderung sama dengan nilai rata-rata suhu udara 29-32o C, kelembapan udara 73-90%, kelembapan lubang 70-75%, pH 6,4-70 dan substratnya adalah lempung berliat, liat dan lempung liat berpasir. Berdasarkan stasiun pengamatan di Daeo ditemukan bahwa parameter lingkungan tidak berbeda nyata (p>0,05) sedangkan berdasarkan waktu menunjukkan terdapat perbedaan antara parameter suhu udara, kelembapan udara dan kelembapan lubang (p<0,05) kecuali pH. Terdapat hubungan yang erat antara parameter lingkungan dengan jumlah hasil tangkapan kepiting kelapa secara spasial (r=0,90) dan temporal (r=0,641). Karakter morfometrik yang diukur meliputi 16 karakter cheliped (Pdak-1, PP-1, PC-1, PM-1, Pdak-2, PP-2, PC-2, PM-2, Pdak-3, PP-3, PC-3, PM-3, Pdak-4, PP-4, PC-4, PM-4) pada masing-masing capit kiri dan kanan serta lima karakter pada karapas (PD, LD, PK, Cp+r, Cp-r) menunjukkan bahwa kepiting kelapa jantan memiliki ukuran rata-rata yang lebih besar dari kepiting betina serta ukuran cheliped kiri rata-rata lebih besar dari cheliped kanan. Ukuran karakter morfometrik kepiting kelapa di populasi Daeo, Laigoma, dan Fitako tidak 2 terpisah secara sempurna berdasarkan analisis diskriminan. Tidak ditemukan karakter penciri setiap lokasi. Hubungan kekerabatan kepiting kelapa antar tiga populasi kepiting kelapa (Daeo, Laigoma dan Fitako) adalah sangat tinggi dengan nilai jarak genetik 0.00-0,01 berdasarkan gen COI dan gen 18S rRNA. Kekerabatan yang tinggi juga ditemukan antara kepiting kelapa di tiga lokasi tersebut dengan kepiting kelapa dari perairan Pasifik (KF182470.1) dan dari Pasifik Utara Barat (LC053596.1). Kepiting kelapa matang gonad (TKG III) ditemukan pada seluruh waktu pengamatan (jantan dan betina) kecuali bulan Januari untuk kepiting kelapa betina. Keadaan ini menunjukkan bahwa potensi reproduksi kepiting kelapa di Daeo cukup tinggi sehingga pemijahan dapat berlangsung setiap saat (tidak musiman). Kisaran ukuran kepiting kelapa hasil tangkapan di Daeo Pulau Morotai, Laigoma
Keyword: ekologi habitat, morfometrik, molekuler, reproduksi, pertumbuhan dan tagging

Judul: Pembuatan Film Tipis Cu2ZnSnS4 sebagai Lapisan Penyerap Cahaya pada Sel Surya Menggunakan Metode Elektrodeposisi
Abstrak: Thin film of Cu2ZnSnS4 (CZTS) is an alternative semiconductor used as light absorber layer on solar cell. CZTS can replace silicon that commonly used as commercial semiconductor. The advantage of using CZTS as absorber layer is due to the abundance of its chemical composer on earth, and its high value of absorption coefficient. The absorber layer was made by using electrodeposition method on ITO glass substrates. The films were deposited at room temperature using potentiostatic mode with a potential of –1.05 V for 30, 45, and 60 minutes. After that, the films were annealed at two different temperatures, 180 ºC and 500 °C, for 45 minutes in N2/H2S atmosphere. Based on X-ray diffraction analysis, the polycrystalline thin film obtained fall into kesterite crystal phase. This type of crystal was obtained when the CZTS was annealed at 500 °C in H2S/N2 atmosphere. The value of optical band gap energy for the CZTS thin film was 2.2 eV with the film thickness about 1.228–6.366 μm. The sample of CZTS with electrodeposition time of 45 minutes and annealing temperature of 500 °C showed the best result and in conformity with absorber layers criteria for solar cells.
Keyword: semiconductor, ITO glass, CZTS thin film, electrodeposition