Hasil Pencarian  ::  Simpan CSV :: Kembali

"Penelitian mengenai struktur komunitas Diatom di area pertambakan Marunda Cilincing, Jakarta Utara telah dilakukan pada bulan Maret hingga Mei tahun 2012. Penelitian bertujuan untuk mengetahui struktur komunitas Diatom pada 3 stasiun penelitian dan hubungan dengan parameter lingkungan di setiap stasiun. Sampel diambil secara horizontal di setiap stasiun di area pertambakan Marunda Cilincing, Jakarta Utara. Hasil identifikasi sampel diperoleh 27 marga Diatom di perairan area pertambakan Marunda. Kepadatan Diatom di area pertambakan Marunda berkisar antara 1847,11?4729,643 sel/m3. Area pertambakan Marunda didominansi oleh Thalassiosira dan Thalassionema. Berdasarkan nilai Indeks kemerataan, marga Diatom tidak tersebar merata di Area pertambakan Marunda. Nilai indeks keanekaragaman menunjukan perairan di area pertambakan Marunda memiliki tingkat pencemaran berat.

---

Research on The Community Structure of Bacillariophyta (Diatomae) in brackish water ponds of Marunda Cilincing, North Jakarta was conducted on March and May 2012. The aims of this study was to determine the community structure of Diatomae from 3 stations and the relationship of environmental parameters at each station. Samples were taken horizontally at 3 stations of brackish water ponds of Marunda.

The identification results of samples obtained 27 genera of Diatomae in the waters. The density of Diatomae in brackish water ponds of Marunda was between 1847,11?4729,643 cell/m3. The waters in brackish water ponds of Marunda was dominated by Thalassiosira dan Thalassionema. Based on index of distribution point, genera of Diatomae in brackish water ponds of Marunda is maldistribution. Index of diversity point showed brackish water ponds of Marunda was heavily polluted."

"Penelitian ekperimental untuk menguji aktifitas antifeedant ekstrak metanol Archaster typicus terhadap ikan karang telah dilakukan di Perairan Pulau Pramuka, Kepulauan Seribu, DKI Jakarta. Sampel diekstrak dengan metode maserasi dengan menggunakan pelarut metanol. Uji antifeedant dilakukan dengan mengaitkan pakan buatan yang mengandung ekstrak metanol Archaster typicus pada konsentrasi fisiologis (0,0245 g/ml), jeli, makanan ikan, dan pewarna makanan menggunakan peniti pada tali propilen. Pakan tersebut kemudian diuji di terumbu buatan pada kedalaman 3 m dan diamati jumlah pakan yang dimakan dan tidak oleh ikan karang. Analisis chi kuadrat pada tingkat kepercayaan 0,01 menunjukkan bahwa terdapat korelasi antara dimakan dan tidak dimakannya pakan perlakuan terhadap penambahan ekstrak metanol Archaster typicus. Penelitian menunjukkan ekstrak metanol Archaster typicus positif memiliki aktivitas antifeedant terhadap ikan karang dan hal tersebut diduga disebabkan oleh adanya kandungan saponin pada ekstrak metanol Archaster typicus.

---

To investigate antifeedant activity of methanol extract of Archaster typicus against reef fishes a field experiment was conducted at Pramuka Island Watery, Seribu Island, DKI Jakarta. Archaster typicus samples were extracted using maceration method while taking methanol as the solvent. The antifeedant assay was conducted by attaching the artificial food that contains methanol extract of Archaster typicus at natural concentration (0.0245 g/ml), jelly, fish food, and food dye, using safety pins to propylene ropes. After that, the artificial food was observed at artificial reef in 3 m depth. The amount of artificial food eaten and left by reef fishes was also observed. Chi square analysis for α (p) = 0.01 revealed that there is correlation between eaten and not eaten of treat food to addition of methanol extract of Archaster typicus. That means methanol extract of Archaster typicus has antifeedant activity againts reef fishes. That was beyond saponin content in the extract."