Judul: Studi Keanekaragaman & Kelimpahan Gastropoda Di Suaka Margasatwa Pulau Rambut, DKI Jakarta
Abstrak: Hutan mangrove memiliki fungsi ekonomis dan ekologis. Secara ekologis, hutan mangrove berfungsi sebagai tempat berlindung dan berkembang biak bagi berbagai jenis fauna serta sebagai mata rantai perputaran energi dan hara yang penting artiya bagi kehidupan alam hayati laut. Gastropoda merupakan salah satu komunitas moluska yang hidup di ekosistem mangrove dan memanfaatkan partikel serasah dari vegetasi mangrove sebagai sumber makanannya. Produktivitas serasah yang dihasilkan suatu hutan mangrove menentukan pula peningkatan populasi gastropoda yang ada. Akibat degradasi lahan dan kerusakan Iingkungan yang terjadi di pulau Rambut, pada sebagian hutan terdapat hutan mangrove dengan vegetasi yang terbuka selain hutan mangrove dengan vegetasi yang masih rapat. Hal ini dapat mempengaruhi karakteristik habitat hutan mangrove baik dari vegetasi maupun keanekaragaman moluska yang ada.
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Judul: Species Composition and Vegetation Structure of Mangrove Forest in Pulau Rambut Wildlife Reserve, Kepulauan Seribu, DKI Jakarta
Abstrak: Hutan mangrove di Suaka Margasatwa Pulau Rambut memiliki keanekaragaman hayati yang tinggi sehingga diperlukan penelitian mengenai komposisi jenis dan struktur vegetasi. Penelitian ini bertujuan untuk mengkaji komposisi jenis dan struktur vegetasi hutan mangrove di Suaka Margasatwa Pulau Rambut. Analisis vegetasi dilakukan dengan metode jalur dan garis berpetak dengan luasan plot contoh 8000 m2 dan berjumlah 8 jalur masing-masing dengan ukuran 10m x 100 m. Hasil penelitian menunjukkan bahwa hutan mangrove Suaka Margasatwa Pulau Rambut memiliki 9 jenis dari 5 famili dan didominasi oleh famili Rhizophoraceae. Jenis Rhizophora mucronata mendominasi pada tingkat pertumbuhan pohon dan semai. Jenis Ceriops tagal mendominasi pada tingkat pertumbuhan pancang. Nilai keanekaragaman, kekayaan, dan dominansi di hutan mangrove Suaka Margasatwa Pulau Rambut pada berbagai tingkat pertumbuhan tergolong rendah, namun nilai kemerataan jenisnya tergolong tinggi. Proporsi jumlah pohon dan permudaan membentuk kurva “J” terbalik. Stratifikasi tajuk pada hutan mangrove SM Pulau Rambut hanya mencapai stratum C (4-20 m)., Mangrove forest in Pulau Rambut Wildlife Reserve has high biodiversity, so research is needed on species composition and vegetation structure. This study aims to examine the composition of the type and structure of mangrove forest vegetation in the Pulau Rambut Wildlife Reserve. Vegetation analysis was carried out using the strip and line method with a sample plot area of 8000 m2 and a total of 8 lanes each with a size of 10 m x 100 m. The results showed that the mangrove forest of Pulau Rambut Wildlife Reserve has 9 species from 5 families and is dominated by the Rhizophoraceae family. The type of Rhizophora mucronata dominates the growth rate of trees and seedlings. The type of Ceriops tagal dominated the sapling growth rate. The value of diversity, richness, and dominance in the mangrove forest of the Pulau Rambut Wildlife Reserve at various growth rates is low, but the value of species evenness is high. The proportions of the number of trees and regeneration form an inverted “J” curve. The canopy stratification in the mangrove forest of Pulau Rambut Wildlife Reserve only reached stratum C (4-20 m).
Keyword: mangrove forest, Rambut Island, species composition, vegetation structure

Judul: Evaluation of Influenza Antibody Titers in Serum and Egg Yolk of Layers Vaccinated with Influenza Vaccines.
Abstrak: Influenza belongs to the Orthomyxoviridae family which causes upper and lower respiratory tract infection. The aim of this study was to evaluate influenza-A specific antibody titers from serum and egg yolk of hens vaccinated with quadrivalent influenza vaccines. Three Hy-line Brown layers were vaccinated with quadrivalent influenza type A and B inactivated vaccines. Vaccination was carried out three times at a dose of 0.25 ml/chicken via the intramuscular route. The first vaccination was carried out at 24 weeks of age, then boosters were performed at 28 and 32 weeks of age. Serum and egg yolk were collected every week for 20 weeks since the first vaccination. Influenza A H3N2 and H1N1 antibody titers were determined using hemagglutination-inhibition (HI) test and agar-gel-precipitation (AGP) test. Influenza-A H3N2 and H1N1 specific antibodies were detected in both serum and egg yolk from the first to twenty weeks after the initial vaccination. Highest HI geometric mean titer (GMT) of H1N1 antibody reached 26.67 HIU at nine weeks post first vaccination (p.f.v), while H3N2 antibody reached 26 HIU at six weeks p.f.v. Our result showed that influenza antibodies can be produced in layers using quadrivalent vaccines and layer chickens are able to produce equivalent antibody levels for each influenza subtype.
Keyword: antibody, egg yolk, influenza, layer chickens, serum