Judul: Meristic and Morphometric Characters of Mangrove Crabs (Scylla serrata, Forskal 1775) and Their Relationship with the Mangrove Ecosystem in the Youtefa Bay, Jayapura City and Kalimaru, Merauke Regency, Papua Province, Meristic and Morphometric Characters of Mangrove Crabs (Scylla serrata, Forskal 1775) and Their Relationship with the Mangrove Ecosystem in the Youtefa Bay, Jayapura City and Kalimaru, Merauke Regency, Papua Province
Abstrak: Scylla serrata merupakan biota laut yang berasosiasi dengan ekosistem mangrove dan telah menjadi komoditas perikanan penting di Indonesia sejak awal tahun 1980-an. Pengamatan karakteristik meristik dan morfometrik S.serrata akan dilakukan di Teluk Youtefa, Jayapura dan Kalimaro, Merauke. Tujuan penelitian adalah untuk mengetahui karakteristik morfometri dan meristik serta hubungannya dengan ekosistem mangrove. Metode yang digunakan adalah kuantitatif dan deskriptif. Hasil uji homogenitas menunjukkan hasil yang homogen dengan korelasi (r) 0.80 dan (r) 0.85. Dan pada uji T diperoleh hasil 96,05% yang tidak berbeda nyata pada karakteristik meristik dan morfometri S.serrata. Fraksi substrat Kalimaro didominasi oleh lempung (28.53%) dan pasir halus (11.05%) yang berarti jenis substratnya adalah lempung berpasir, sedangkan Youtefa didominasi oleh pasir sangat kasar (27.00%) lempung (15.45%) atau Tipe pasir berlumpur. Untuk endapan C-organik pada substrat Youtefa (4.92%) dan Kalimaro (9.58%) dalam kategori baik, namun hasil korelasi menunjukkan Kalimaro (r) 95% sedangkan Youtefa (r) -95% dengan selang kepercayaan (p<0.05) ) ini berbanding lurus dengan kelimpahan Kalimaro (390 individu/Ha) dan Youtefa (110 individu/Ha). Kerapatan mangrove di Youtefa (4800-7800 individu/ha) didominasi oleh Rhizophora 73,1% dan Kalimaro (2600-3700 individu/Ha), didominasi oleh Avicennia 75%. Hubungan ekosistem mangrove dengan karakteristik S. serrata diperoleh hasil (r) 0,3997 Youtefa dan Kalimaro (r) 0,5991 atau hampir 60%, artinya ekosistem mangrove Kalimaro memiliki hubungan yang erat pada karakteristik meristik dan morfometri dibandingkan dengan Teluk Youtefa., Scylla serrata is a marine biota associated with mangrove ecosystems and has been an important fishery commodity in Indonesia since the early 1980s. Observations of the meristic and morphometric characteristics of S.serrata will be carried out in Youtefa Bay, Jayapura and Kalimaro, Merauke. The research objective was to determine the morphometric and meristic characteristics and their relationship with the mangrove ecosystem. The methods used are quantitative and descriptive. Homogeneity test results showed homogeneous results with a correlation (r) 0.80 and (r) 0.85. And in the T test, the results obtained were 96.05% which was not significantly different in meristic and morphometric characteristics. The substrate fraction of Kalimaro is dominated by clay (28.53%) and fine sand (16.84%) which means that the type of substrate is sandy loam, while Youtefa is dominated by very coarse sand (27.00%) clay (15.45%) or muddy sand. Type. for the C-organic deposits on Youtefa (4.92%) and Kalimaro (9.58%) substrates in the good category, but the correlation results showed Kalimaro (r) 95% while Youtefa (r) -95% with a confidence interval (p> 0.05) is directly proportional to the abundance of Kalimaro (390 individuals/m2) and Youtefa (110 individuals/m2). Mangrove density in Youtefa (4800 -7800 individuals/ha) was dominated by Rhizophora 73.1% and Kalimaro (2600-3700 individuals/ha), dominated by Avicennia 75%. The relationship between the mangrove ecosystem and the characteristics of S. serrata obtained results (r) 0.3997 Youtefa and Kalimaro (r) 0.5991 or almost 60%, meaning that the Kalimaro mangrove ecosystem has a close relationship on meristic and morphometric characteristics compared to Youtefa Bay.
Keyword: mangrove, scylla serrata, meristik dan morfometrik

Judul: Karakteristik habitat dan potensi kepiting bakau (Scylla serrata, S.transquaberica, dan S.olivacea) di Hutan Mangrove Cibako, Sancang Kabupaten Garut Jawa Barat
Abstrak: The research was conducted in August - November 2011. The site contains six stations, each station in three zones. Station 1 and 2 was placed in zona A where zone A in the front area of mangrove forest. Station 3 and 4 was placed in zone B that location in the middle of mangrove forests. Station5 and 6 was placed in zone B where location in behind the mangrove forest. This study aims to obtain data and information on the habitat characteristics and potency of mud crab based on the existence of species, abundance, and size distribution. The method used was a survey. Observations of habitat characteristics performed in-situ by the method of sampling transect line plot. Cluster evaluation of habitat characteristic used cluster analysis. Analysis of habitat characteristics with potency of mud crab used correspondence analysis. The results showed that the parameters of habitat 1 and 2 had been similarity, and this was classified as groups of zone A. The similarity of parameters in station 3 and 4 were classified as group of Zone B, and the similarity of parameters in stations 5 and 6 were classified as group of zone C. S.serrata dominated in zona A where the substrat were mud with range of salinity between 24 – 30 ppt, totaled 73 ind. S.tanquaberica dominated in zone B where the substrat were mud with range of salinity between 22 – 25 ppt, totaled 94 ind. S.olivacea dominated in zone C where the substrat were clay with range of salinity between 18 – 23 ppt, totaled 45 ind. The abundance of mud crabs were in dark moon, where totaled zona A was 57 ind, zone B was 68 ind, and zone C was 32 ind. Mud crabs had possess of negative phototactic, because the habit of mud crab often refuge and hiding on a substrate that was not exposed to light directly. The high density of mangroves were found in zona A and B. which Third of mud crabs associated with mangrove that had density so higher. The average of litter weight as source of food for macrozoobentos, each which of was 200.72 g and 204.83 g. The average of macrozoobentos abundance, each which of was 13 ind/m2 dan 17 ind/m2 . Therefore, mud crabs would interest to settle in zone that had abundance of macrozoobentos as source of food.
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Judul: Elektrodeposisi Film Tipis Semikonduktor Cu2ZnSnS4 (CZTS) pada Substrat Kaca ITO
Abstrak: Semiconductor Cu2ZnSnS4 (CZTS) thin film that can be used as absorber layers on solar cell module was made via electrodeposition method. CZTS thin film was electrodeposited on the surface of a silicate glass coated with a thin layer of indium tin oxide (ITO). Deposition process was done using potentiostatic mode at room temperature with a potential of 1.05 V for 30, 45, and 60 minutes, followed with annealing the film at 2 different temperatures, 500 ºC using furnace and 180 ºC using hot plate, both treatments for 45 minutes in N2/H2S atmosphere. The X-ray difractograms were analyzed using Match 2 program and showed that the CZTS thin films had kesterit crystalline structure, with a low percentage of CZTS phase. The thin film also contained secondary phases such as Cu2S, ZnS, and SnS. The obtained CZTS thin films had a thickness between 1.039 and 1.676 μm. Absorption study showed that the band gap energy of CZTS thin films which was annealed using furnace ranged from 1.50 to 1.52 eV, whereas that annealed using the hot plate was not observed. The band gap energy value showed that CZTS thin films can be used as sunlight absorber layers on solar cell. The formation of CZTS crystal film on this investigation was effectively performed using furnace annealing process at a temperature of 500 ºC with deposition time of 45 minutes.
Keyword: Thin film, Electrodeposition, Cu2ZnSnS4