Judul: Diversity and Associations of Gastropods in the Mangrove Ecosystem of Lancang Island, Kepualauan Seribu, DKI Jakarta
Abstrak: Ekosistem mangrove merupakan area pada batas pasang surut dengan gradien sifat lingkungan yang tajam. Salah satu biota yang dapat hidup pada ekosistem ini adalah gastropoda. Penelitian ini bertujuan untuk mengetahui keanekaragaman dan hubungan asosiasi gastropoda dan mangrove yang ada di Pulau Lancang, Kepulauan Seribu, DKI Jakarta. Penelitian ini dilakukan menggunakan metode transek garis dan transek kuadran, serta pengukuran kualitas air dan fraksinasi sedimen di empat stasiun. Hasil penelitian menunjukkan bahwa kualitas perairan di Pulau Lancang tergolong baik dengan tipe substrat berpasir. Genus mangrove yang berhasil diidentifikasi adalah Rhizophora, Sonneratia, dan Avicennia. Gastropoda yang teridentifikasi terdiri dari 12 spesies, yang berasal dari 11 genus dan 9 famili. Spesies dengan jumlah terbanyak yaitu Terebralia palustris, Monodonta labio, dan Littoraria scabra. Hasil analisis koresponden menunjukkan bahwa terdapat dua pengelompokkan komunitas gastropoda dengan asosiasi tertinggi pada mangrove Rhizophora. Spesies gastropoda yang berasosiasi dengan Rhizophora adalah Littoraria scabra, Monodonta labio, Tectus pyramis, Nerita albicilla, Cerithidea cingulata, Terebralia palustris, dan Telescopium telescopium., Mangrove ecosystem is an area at the tidal boundary with a sharp gradient in environmental characteristics. One type of biota that can live in this ecosystem is gastropods. This research aimed to understand the diversity and association between gastropods and mangrove on Lancang Island, Kepulauan Seribu, DKI Jakarta. The study utilized line and quadrant transect methods, along with water quality and sediment fractination were measured at four stations. The research findings indicate that the water quality on Lancang Island is relatively good, with substrates dominated by sand. Mangrove genera identified were Rhizophora, Sonneratia, and Avicennia. Gastropods comprised of 12 species, originating from 11 genera and 9 families. The species with highest occurrence were Terebralia palustris, Monodonta labio, and Littoraria scabra. Correspondencce analysis results show that there are two groupings associated, with the highest gastropods composition associated with Rhizophora mangroves. Species associated with Rhizophora include Littoraria scabra, Monodonta labio, Tectus pyramis, Nerita albicila, Cerithidea cingulata, Terebralia palustris, and Telescopium telescopium.
Keyword: Association, Diversity, Gastropods, Mangrove ecosystem

Judul: Diversity and Association of Epifauna Gastropods in Mangrove and Seagrass of Tidung Kecil Island, Seribu Island
Abstrak: Pulau Tidung Kecil memiliki berbagai ekosistem pesisir, seperti ekosistem mangrove dan lamun. Kedua ekosistem tersebut menjadi tempat berlindung, mencari makan, dan memijah bagi gastropoda. Penelitian ini bertujuan menganalisis keanekaragaman dan asosiasi gastropoda epifauna pada mangrove dan lamun Pulau Tidung Kecil, Kepulauan Seribu. Pengamatan data mangrove, lamun, dan gastropoda dilakukan pada 4 (empat) stasiun dengan metode transek garis dan transek kuadrat, setiap stasiun dilakukan pengukuran kualitas perairan. Gastropoda epifauna yang ditemukan pada lokasi penelitian terdiri dari 25 spesies dan 11 famili yaitu famili Cerithiidae, Ellobiidae, Littorinidae, Muricidae, Nassariidae, Naticidae, Neritidae, Potamididae, Strombidae, Trochidae, dan Turbinidae dengan nilai keanekaragaman keseluruhan stasiun tergolong sedang. Spesies gastropoda epifauna yang mendominasi yaitu Terebralia palustris dari famili Potamididae. Spesies mangrove yang ditemukan pada lokasi penelitian yaitu Rhizophora stylosa, sedangkan spesies lamun yaitu Thalassia hemprichii, Enhalus acoroides, Cymodocea rotundata, dan Halophila ovalis. Kualitas perairan pesisir Pulau Tidung Kecil tergolong baik untuk mangrove, lamun, dan gastropoda dengan tipe substrat lempung berdebu. Hasil analisis CA menunjukkan bahwa famili gastropoda Cerithiidae, Ellobiidae, Muricidae, Naticidae, Neritidae, Strombidae, dan Turbinidae berasosiasi dengan lamun, sedangkan famili gastropoda Littorinidae dan Trochidae berasosiasi dengan mangrove., Tidung Kecil Island has various coastal ecosystems, such as mangrove and seagrass ecosystems. Both ecosystems provide shelter, foraging, and spawning for gastropods. This study aims to analyze the diversity and association of epifauna gastropods in the mangrove and seagrass of Tidung Kecil Island, Seribu Island. Observation of mangrove, seagrass, and gastropod data was carried out at 4 (four) stations using line transect and quadratic transect methods, each station measuring water quality. The epifauna gastropods found at the study site consisted of 25 species and 11 families, namely Cerithiidae, Ellobiidae, Littorinidae, Muricidae, Nassariidae, Naticidae, Neritidae, Potamididae, Strombidae, Trochidae, and Turbinidae with the overall diversity value of the stations classified as moderate. The dominant epifauna gastropod species was Terebralia palustris from family Potamididae. The mangrove species found at the research site was Rhizophora stylosa, while the seagrass species were Thalassia hemprichii, Enhalus acoroides, Cymodocea rotundata, and Halophila ovalis. The coastal water quality of Tidung Kecil Island was classified as good for mangroves, seagrasses, and gastropods with a silt loam type of substrate. The results of CA analysis showed that the gastropod families Cerithiidae, Ellobiidae, Muricidae, Naticidae, Neritidae, Strombidae, and Turbinidae were associated with seagrass, while the gastropod families Littorinidae and Trochidae were associated with mangrove.
Keyword: lamun, association, diversity, gastropod, mangrove, seagrass, asosiasi, gastropod, keanekaragaman

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