Judul: Variasi Karakter Morfometrik Gastropoda Berdasarkan Karakteristik Habitat Mangrove di Kawasan Bee Jay Bakau Resort, Probolinggo
Abstrak: Beejay Bakau Resort (BJBR) in Probolinggo is a mangrove ecotourism rehabilitation area that has been planted for a long period. There are seven different varieties of mangroves in the BJBR area. The mangrove environment in BJBR is in good shape, and the local population used to catch shellfish in large quantities, but there is a section of the mangrove that has been harmed and even killed as a result of human activity (anthropogenic). The presence of related biota or gastropods is strongly influenced by the density of mangroves as the ecosystem's principal constituent. Gastropods play a crucial function in the mangrove ecosystem's food chain cycle. Environmental factors, food, and predators all influence the abundance and distribution of gastropods. The abundance of mangrove litter occurs because the density of mangroves is also great, allowing the snail to feed on the litter. This study took place in the BJBR area in December 2020. Purposive sampling approach was used to determine sampling based on the existence of mangrove vegetation zoning. The quadratic transect method was used to collect gastropod and mangrove vegetation data, while environmental parameters were measured in situ. Principal Component Analysis was used to investigate the association between morphometric characters and snail species (PCA). Correspondent Analysis was used to examine the link between research stations and morphometric features (CA). The findings revealed that there are seven families of gastropods in the BJBR area (Ellobiidae, Littorinidae, Potamididae, Nassaridae, Cerithiidae, and Muricidae) and 23 species of gastropods. The study station's average gastropod diversity and uniformity are in the middle range, while dominance is in the low range. Because numerous medium and big gastropods were found in the area, gastropods have a relationship between fluctuations in environmental variables and high mangrove density. A sedimentary substrate with clay proportion is present at all research stations. The findings of this study may be relevant in developing BJBR management policy based on mangrove ecotourism.
Keyword: abundance, Bee Jay Bakau Resort, gastropods, mangrove

Judul: Biologi Populasi Kerang (Telescopium telescopium dan Cerithidea obtusa) dan Keterkaitannya dengan Karakteristik Habitat Mangrove di Kawasan Beejay Bakau Resort, Probolinggo
Abstrak: Ekosistem mangrove BeeJay Bakau Resort (BJBR) adalah ekosistem mangrove rehabilitasi seluas 89 ha yang dimanfaatkan masyarakat sekitar untuk mencari berbagai macam sumberdaya, salah satunya adalah gastropoda. Gastropoda merupakan biota yang dapat ditemukan secara luas baik di darat, air, dan sebagian di ekosistem mangrove. Dua spesies yang banyak ditemukan adalah Telescopium telescopium dan Cerithidea Obtusa. Biota ini memiliki potensi untuk dikembangkan menjadi bioindikator, secara ekonomi, dapat pula dimanfaatkan untuk dijual dan dikonsumsi. T. telescopium memiliki kandungan protein sebesar 12,16% dan lemak 0,38%. C. obtusa memiliki kandungan gizi protein 13,8% dan lemak 2,8%. Pemanfaatan yang berlebihan dapat menyebabkan menurunnya kelimpahan dari gastropoda. Berdasarkan potensi tersebut, dua spesies yang dapat ditemukan di pesisir Probolinggo Jawa Timur menarik untuk ditelaah lebih lanjut mengenai interaksinya dengan ekosistem mangrove untuk dapat dikelola secara berkelanjutan. Penelitian ini dilakukan pada Bulan Desember 2020 di ekosistem mangrove BJBR, Probolinggo. Penentuan stasiun dilakukan dengna menggunakan purposive sampling berdasasrkan karakteristik ekosistem mangrove. Pengumpulan data gastropoda dilakukan dengan menggunakan transek kuadran gastropoda (1x1m). Karakteristik lingkungan di semua stasiun dianalisis menggunakan PCA (Principal Component Analysis) sedangkan sebaran gastropoda berdasarkan struktur ekosistem mangrove dianalisis menggunakan CA (Correspondence Analysis). Hasil penelitian menunjukkan bahwa kelimpahan gastropoda T. telescopium sebesar 144 ind dan C. obtusa sebanyak 29 ind. T. telescopium memiliki kepadatan yang lebih tinggi dibandingkan C. obtusa dengan pola persebaran mengelompok hampir di seluruh stasiun. Secara umum, kedua jenis gastropoda memiliki pola pertumbuhan allometrik negatif dengan kondisi yang baik untuk dimanfaatkan karena memiliki bentuk yang montok. Kehidupan gastropoda dipengaruhi oleh karakteristik ekosistem mangrove. C. obtusa berkuran kecil dan besar berasosiasi dengan mangrove dengan kerapatan jarang A. marina (<10). T. telescopium berkuran kecil berasosiasi dengan mangrove R. mucronata (<10). T. telescopium berukuran sedang dapat ditemukan di mangrove R. stylosa (≥ 15) kerapatan tinggi. Sedangkan T. telescopium besar dapat ditemukan di mangrove A. marina dan R. mucronata dengan kerapatan sedang hingga tinggi (≥ 15 dan ≥ 10 - <15).
Keyword: Beejay Bakau Resort, gastropoda, abundance, mangrove

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