Judul: Asosiasi ikan dengan padang lamun di perairan karang lebar, kepulauan seribu, Jakarta
Abstrak: Seagrass is a complex aquatic ecosystem in trophics area with high productivity and biodiversity. This ecosystem play role of physics, chemistry, and biology. Biologically, seagrass used as spawning, feeding, and nursery ground for aquatic biota, especially fish. Seagrass is part of the coastal region where there are many human activities, such as coastal development, overfishing, boat traffic, and sand mining. One of the seagrass areas with high human activity around is Karang Lebar shallow waters, Kepulauan Seribu, Jakarta. Types of data taken in this research is primary data, including environmental parameters, condition of seagrass and fishes that live in it. Fishes caught by gill net with mesh size from 0.5 – 3 cm. Sampling conducted in day and night, started from March until May 2011 with the arrest period twice a month. Observations were made at three stations of seagrass beds with different covering conditions (healthy, less healthy, and poor). Sorensen similarity index, constancy index, and fidelity index were used to determine the relationship of fish associated with seagrasses. In addition, it also used statistical tests such as Pearson correlation, biplot analysis, and Two Way ANOVA as a tool to test the truth of descriptive analysis results based on the facts as represented by data. Three seagrass species found in the observation area include Thalassia hemprichii, Cymodocea rotundata, and Halophila ovalis. The highest cover obtained from Cymodocea rotundata. Value of total cover ranged between 26.5 % - 82.13 %. The highest INP of the species obtained from Cymodocea rotundata, indicate that these organisms have a great influence to the ecosystem. Fish were caught consist of 37 species and 22 genera. Total abundance was found in all three observation stations for 2287 individuals (healthy seagrass), 547 individuals (less healthy seagrass), and 889 individuals (poor seagrass). Pre-adult fish dominate at each station. While the most commonly species found are Hypoatherina temmincki, Gerres oyena, and Scolopsis lineatus. The catch composition on day and night differ in terms of abundance, type and size of the species. Adult fish were more common at night, although abundance in day were more than in the night. Based on size and species composition, healthy seagrass and less healthy seagrass functioning as nursery ground and feeding ground, while poor seagrass tend to play a role as feeding ground, especially for carnivorous fish. Change of the diversity and dominance value in the day and night allegedly due to the activity or movement of fish, which is not a permanent resident in seagrass. Referring Tomascik et al. (1997), permanent resident fish found in the observation area is Apogon margaritiphorus. Based on Sorensen similarity index, the fishes were divided into six groups of species. Constancy index ranging from 0-1, while fidelity index ranges from 0-3. Group of species 1 has a high preference on healthy and poor seagrasses, and low preference in unhealthy seagrasses. Healthy seagrass also preferred by group 6, which include Apogon kallopterus, Apogon margaritiphorus, Hemirhapus far, Chrysiptera hemicyanea, and Syngnathoides biaculeatus. Groups of species that have a high preference towards less healthy habitat is group 4, with Stethojulis balteata, and Chaetodon
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Judul: Ichthyofaunal Biodiversity in Seagrass Ecosystem of Semak Daun Island, Kepulauan Seribu Marine National Park
Abstrak: Pulau Semak Daun merupakan salah satu pulau kecil di bagian selatan Kepulauan Seribu yang di kelilingi ekosistem lamun. Perairan ekosistem lamun berfungsi sebagai tempat mencari makan, tempat perlindungan, dan daerah asuhan bagi komunitas ikan. Penelitian ini bertujuan untuk mengidentifikasi biodiversitas iktiofauna ekosistem lamun Pulau Semak Daun, Kepulauan Seribu pada musim penghujan, peralihan 1, dan peralihan 2 tahun 2018-2019 dan hubungan antara komposisi ikan dengan parameter fisik-kimiawi perairan. Pengambilan contoh ikan dilakukan dengan menggunakan alat tangkap berupa pukat tarik di perairan ekosistem lamun Pulau Semak Daun yang dilaksanakan selama 5 bulan yaitu September, November, Desember 2018 serta Februari dan Maret 2019. Analisis data yang digunakan meliputi analisis indeks ekologis, analisis ragam, analisis similaritas satu arah, analisis korespondensi kanonik. Selama penelitian, ikan yang tertangkap sebanyak 51 spesies dari 24 famili ikan. Komposisi kumpulan ikan berbeda secara temporal (musim). Analisis Korespondensi Kanonikal memperlihatkan kumpulan ikan di Pulau Semak Daun berkorelasi positif dengan parameter lamun dan oksigen terlarut. Keanekaragaman iktiofauna ekosistem padang lamun Pulau Semak Daun tergolong dalam kategori sedang., Semak Daun Island is one of the small islands in the southern part of the Kepulauan Seribu Marine National Park, surrounded by seagrass ecosystems. Seagrass ecosystems are a place to find food, shelter, and nursery areas for fish communities. This study aims to analyze the ichthyofaunal biodiversity of the seagrass ecosystem of Semak Daun Island, Seribu Islands Marine National Park, during the rainy season, transition 1, and transition 2 in 2018-2019 and the relationship between fish composition and physicochemical parameters of the waters. Fish sampling were taken using fishing gear of seine nets in the seagrass ecosystem waters of Semak Daun Island was carried out for five months, namely September, November, December 2018, and February and March 2019. Data analysis used included ecological index analysis, analysis of variance, one-way analysis of similarities, and canonical correspondence analysis. During the study, 51 fish species were caught from 24 families, mainly at the juvenile stage. The composition of the fish assemblage differs temporally (season). Canonical correspondence analysis showed that Semak Daun Island fish assemblages positively correlated with seagrass coverage and dissolved oxygen parameters. The ichthyofauna diversity of Semak Island’s seagrass ecosystem is classified as moderated.
Keyword: ichthyofaunal biodiversity, Semak Daun Island, seagrass ecosystem

Judul: Isolasi senyawa sinamaldehida dari minyak kulit kayu manis sedagai antioksidan
Abstrak: Cinnamaldehyde is a major essential oil component of cinnamon bark. Cinnamon oil was isolated by using water distillation method that yielded 0.93% (w/w) or 0.95% (v/w). Gas chromatography mass spectrometry (GCMS) of cinnamon oil showed that the main component of the oil is a trans-cinnamaldehyde 32.8% and 3-phenyl-2-propenal 22.9%. The oil was further isolated for cinnamaldehyde by using preparative thin layer chromatography method at Rf of 0.62. GCMS analysis showed that cinnamaldehyde content was 89.1%. Furthermore, the cinnamaldehyde was tested for its antioxidant activity. The isolated product has antioxidant activity with IC50 of 5.06 mg/L as compared with positive control using butylated hydroxytoluene, which has the activity of 10.4 mg/L.
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