Article historyThis study has compared the distribution of nutrients phosphate and nitrate concentrations in the inner Ambon Bay during two different seasons: Northwest dan Southeast monsoon. The result showed that the nutrient concentrations in the Southeast monsoon were higher than those in the Northwest monsoon, both for phosphate and nitrate. The ranges of phosphate concentrations on the surface and near the bottom of the bay during the Northwest monsoon were 0.0471-0.0549 mg/L and 0.0549-0.1176 mg/L while the ranges of nitrate concentrations were from undetected to 0.0976mg/L on the surface, and 0.0956-0.5870 mg/L near the bottom of the bay. Meanwhile, the phosphate and nitrate concentration on the surface during the Southeast monsoon were 0.0495-0.0676 mg/L and 0.0247-0.4019 mg/L, while near the bottom the concentrations were 0.0495-0.1802 mg/L and 0.0247-0.7944 mg/L. These results indicated that phosphate and nitrate concentrations in the inner Ambon Bay have exceeded the marine water standard quality, which can be categorized as polluted. High concentrations of phosphate and nitrate during Northwest monsoon could be caused by run-off from the mainland area that enters the bay trough the river. On the other hand, the enrichment of nutrients in the inner Ambon Bay during the Southeast monsoon could be dominated by the "nutrient-rich water mass" from Banda Sea that enters the inner Ambon Bay.

Zooplankton has an important role in thropic ecology at coastal area. According to their ecological function as the first consumer, zooplankton linked between producers (phytoplankton) and other marine organisms in the higher thropic level. The abundance of zooplankton in coastal area can be indicate as secondary productivity and as a food source for fisheries. This study aims to examine the biodiversity of zooplankton in coastal area of Keffing Island, Eastern Seram regency. Sampling was conducted in November 2017 during November (transitional season II) using NORPAC net (mesh size 300 micrometer) with vertical hauling from 10 meter of deep to the surface water. Samples were preserved with 4% formaldehyde and identify in the laboratory. The results showed that the biodiversity of zooplankton during transitional season II was 28 species, which copepods are the dominant taxa (13 species, 46.43% of total zooplankton). The total abundance of zooplankton is 351-1190 individu/m3, which Oncaea sp, Eucalanus sp and Corycaeus sp are abundant. Study biodiversity in coastal area of Keffing Island is important to support fisheries management programs. Avalaibility of data on the composition and abundance of zooplankton can be used as baseline data of secondary productivity and potency of natural food source in coastal area. Zooplankton mempunyai peranan penting dalam jejaring ekologi perairan pesisir. Posisinya sebagai konsumen pertama akan menghubungkan antara produsen dalam hal ini fitoplankton dengan biota pada tingkat tropik level di atasnya. Kelimpahan zooplankton di suatu perairan dapat menggambarkan produktivitas sekunder dan potensialitas pakan alami dari sumberdaya perikanan di suatu perairan. Penelitian ini bertujuan untuk mengkaji biodiversitas zooplankton di perairan pesisir Pulau Keffing, Seram Bagian Timur (SBT). Penelitian ini dilakukan pada bulan November 2017 (musim peralihan II). Pengambilan sampel dilakukan dengan menggunakan jaring NORPAC (mata jaring 300 mikrometer), ditarik secara vertikal dari kedalaman 10 meter menuju permukaan. Sampel dipreservasi menggunakan formalin 4%, dan diidentifikasi di laboratorium. Hasil penelitian menunjukkan bahwa biodiversitas zooplankton selama musim peralihan II sebanyak 28 jenis. Komposisi jenis copepoda mendominasi dengan 13 jenis (46,43% dari total komposisi zooplankton). Kelimpahan Total zooplankton berkisar antara 351-1190 ind/m3. zooplankton yang melimpah dari jenis Oncaea sp., Eucalanus sp. dan Corycaeus sp. Kajian tentang biodiversitas zooplankton di pesisir Pulau Keffing sangat penting untuk mendukung program pengelolaan sumberdaya perikanan. Ketersediaan data komposisi dan kelimpahan zooplankton dapat digunakan sebagai data dasar produktivitas sekunder dan potensi pakan alami di perairan.

Banda Sea is part of Indonesia Fisheries Management Area (WPP 714) which famous for Tuna fisheries. In addition to being influenced by Indonesian Through Flow (ITF), the Banda Sea also influenced by eddies. Banda eddies and the relationship to chlorophyll-a were studied by using the output of ocean circulation model produced by INDESO (Infrastructure Development of Space Oceanography) project in Ministry of Marine Affair and Fisheries. Data from 2008 to 2011 during normal phase of South East Monsoon period (June-August 2008), El Nino phase (June-August 2009), and La Nina phase (June-August 2010) were used. The model results showed two clockwise eddies in the northern of Banda Sea and three counterclockwise eddies in the southern of Banda Sea. The clockwise eddies were found at 20 meter depth and induced upwelling in south water of Buru Island, Ambon Island and Lease Island (Haruku, Saparua and Nusalaut Islands). Otherwise, counterclockwise eddies in the southern of Banda Sea (north of Wetar Island and Yamdena Island) generate the downwelling. High vorticity value of the eddy was found in the northern of Wetar Island. The presence of Banda Eddies on South East Monsoon period play an important role to maintain the water mass balance in the Banda Sea. Eddies also have strong influence on nutrient sinking from the surface of water. In addition, the eddies vorticity increased during the La Nina period and lead to low surface chlorophyll-a in the surface of the Banda Sea.

Landslide disaster is one type of disaster that often occurs in Indonesia which causes many casualties and loss of property. Ambon City is an area with high potential for landslides. This is because Ambon City is an area with steep slopes and high rainfall, so a study is needed to overcome this as a disaster mitigation effort. This study aims to determine the area of landslide slip and direction of landslides as a basis for identifying landslide-prone areas using the dipole-dipole configuration geoelectric method. This research was conducted in Poka Village, Ambon City, Maluku Province. Geoelectric measurements using the AGI Ministing tool with data retrieval as much as 5 tracks. Based on the results of the analysis, it was found that the soil layer was dominated by clay and limestone. The reconstruction results show that the topography of the area is a slope with a slope of 45o-80o, and the slip plane has each path with a resistivity contrast of ± 25-60 Ωm at a depth of 5-15 meters, while the direction of the landslide is directed to the southeast.