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Abstrak :
ABSTRACT
Since the Jakarta Bay is economically important for various stake holders, then understanding the eutrophication processes, condition and its status, in the past, present time, and in the future through scientific research is inevitable. The objectives of this research are (1) To analyze the water quality parameters that can be used as an indicator of eutrophication phenomenon, (2) To develop monitoring tools for observing eutrophication process, and (3) To assess the tendency of eutrophication in the future using ASSETS (Assessment of Estuarine Trophic Status) model. The method used in this research is marine remote sensing techniques through the application of multi-temporal and multi-sensor of Landsat satellites data. Results from field sampling of water quality data indicated that the mean of water transparency were stable during 1970?s to 1990?s around 7.5 m, but sharply decreased to 3.8 m in 2000?s On the other hand, the mean chlorophyll-a concentration showed a reversal pattern from water transparency, that the concentration was rapidly increased from 1.71 to 7.8 g/m3 during 1970?s to 2000?s. Based on these data, eutrophication is occuring in the Jakarta Bay. Empirical model for predicting water transparency developed using multitemporal Landsat-7 ETM+ data and field data collected in 2004 indicated that the model was good and capable to predict water transparency. The model was applied to both old Landsat aquired in 1970?a (Landsat-1, 2 and 3 MSS), 1980?s (Landsat-4 and 5 MSS and TM), and 1990?s (Landsat-5 and 7, TM and ETM+), as well as the latest data of 2000?s (Landsat-7 ETM+). Maps of water transparency and Trophic State Indeks (TSI) derived from emprical predicting model indicated a decreasing tendency of water transparency from 7.5 to 4.0 m during the 1970?s to 2000?s with the higest decreasing rate from 1980?s to 2000?s, while the TSI showed an oligotrophic condition during 1970?s to 1980?s, but move to mesotrhopic condition in 1990, and decreasing to eutrophic and hypertrophic condition in 2000?s. Thus, all these facts proved that the eutrophication is still going from the past to the present time. Utilization of ASSETS model for knowing the eutrophication of Jakarta Bay in the future based on several input parameters showed that strong eutrophicatiom will be continued in the future in which caused worsen condition of the water quality.

Abstrak :
Penelitian mengenai struktur komunitas diatom di Perairan Teluk Jakarta telah dilakukan pada bulan Mei dan Juli tahun 2010. Penelitian bertujuan untuk mengetahui hubungan antara struktur komunitas diatom dengan parameter lingkungan. Sampel diambil secara horizontal pada 10 stasiun di Teluk Jakarta. Hasil identifikasi sampel fitoplankton diperoleh 31 marga diatom di perairan Teluk Jakarta. Kepadatan diatom di perairan Teluk Jakarta pada bulan Mei berkisar antara 1.426.896--60.100.560 sel/m3 sedangkan pada bulan Juli kepadatan berkisar antara 76.720--180.017.423 sel/m3. Perairan di Teluk Jakarta pada bulan Mei dan Juli didominansi oleh Skeletonema dan Chaetoceros. Berdasarkan data lingkungan, perairan Teluk Jakarta memiliki kondisi lingkungan yang sesuai untuk pertumbuhan optimal diatom. Berdasarkan analisis multivariat, parameter lingkungan memiliki pengaruh pada bulan Mei dan tidak berpengaruh pada bulan Juli.

Abstrak :
Fitoplankton mempunyai peranan penting di perairan, selain sebagai dasar rantai makanan juga merupakan salah satu indikator kualitas perairan. Tujuan penelitian iniuntuk mengetahui komposisi dan kelimpahan fitoplankton di Teluk Jakarta. Penelitian dilaksanakan pada bulan April, Juni, Agustus, dan Oktober 2010 pada 7 (tujuh) stasiun di Teluk Jakarta. Hasil penelitian menunjukkan bahwa ditemukan 52 genera fitoplankton dari 4 kelas, yaitu Chlorophyceae 3 genera, Cyanophyceae 3 genera, Dinophyceae 8 genera, dan Bacillariophyceae 38 genera dengan total kelimpahan berkisar 270.043 sampai 1.534.425 sel/L. Kelimpahan kelas Bacillariophyceae lebih tinggi dibandingkan kelas fitoplankton lainnya. Selanjutnya dari kelas Bacillariophyceae yang sering ditemukan selama penelitian di Teluk Jakarta adalah genus Chaetoceros. Kelimpahan Chaetoceros selama penelitian berkisar 37.003 sampai 656.253 sel/L, merupakan indikator bahwa perairan Teluk Jakarta tercemar.

Abstrak :
Teluk Jakarta merupakan salah satu daerah pesisir dengan aktivitas manusia yang tinggi menghasilkan limbah industri dan limbah domestik berupa kandungan logam berat, kista dinoflagellata yang dapat menyebabkan peristiwa Harmful Algal Bloom (HAB). Penelitian ini bertujuan untuk menganalisis distribusi dan kelimpahan kista dinoflagellate beserta kandungan logam berat dalam sedimen, juga kelimpahan dinoflagellata di air. Sampel sedimen dan air diambil dari 12 titik di Teluk Jakarta. Dinoflagellata genus Noctiluca memiliki kelimpahan yang tinggi dan mendominasi sebagian besar titik pengambilan sampel di perairan Teluk Jakarta (43.382.873 sel/m3). Kista dinoflagellata Alexandrium memiliki kelimpahan yang paling tinggi dengan distribusi luas meliputi ke seluruh titik sampling (53 sel/gram). Korelasi antara kandungan logam berat tembaga (Cu) dengan kelimpahan kista Alexandrium menunjukkan korelasi negatif di semua lokasi penelitian kecuali di Muara Baru. Korelasi kandungan logam berat seng (Zn) dengan kista Alexandrium menunjukkan korelasi positif di semua lokasi penelitian kecuali di Ancol. Ada korelasi positif antara faktor turbiditas dengan kelimpahan kista Alexandrium dan DO dengan kelimpahan kista Alexandrium. Korelasi negatif dan positif ditemukan antara faktor salinitas, suhu dan pH dengan kista Alexandrium. ......Jakarta Bay is one of the coastal areas with high human activity producing industrial waste and domestic waste in the form of heavy metal content, dinoflagellate cysts which can cause Harmful Algal Bloom (HAB) events. This study aims to analyze the distribution and abundance of dinoflagellate cysts along with heavy metal content in sediments, as well as the abundance of dinoflagellates in water. Sediment and water samples were taken from 12 points in Jakarta Bay. Noctiluca dinoflagellates have a high abundance and dominate most of the sampling points in the waters of Jakarta Bay (43.382.873 cell/m3). Alexandrium dinoflagellate cysts have the highest abundance with a wide distribution over all sampling points (53 cell/gram). Correlation between heavy metal copper (Cu) content and abundance of Alexandrium. showed a negative correlation at all study locations except in Muara Baru. The correlation of zinc (Zn) content with Alexandrium cysts showed a positive correlation in all study locations except Ancol. There is a positive correlation between turbidity factor and Alexandrium cyst abundance and DO and Alexandrium cyst abundance. Negative and positive correlations were found between salinity, temperature and pH factors with Alexandrium.