Marine Research in Indonesia (MRI - E-Journal)
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OBSERVATIONS ON THE SPECIES OF DORIPPE FROM THE INDO-MALAYAN REGION
No full textAmong the eight Indo-Pacific species of Dorippe, four inhabiting the Indo-Malayan region were represented in the collection of the National Museum of Singapore. In order to extend our review to all the IndoPacific species, this material was complemented by specimens of three other species, two from Japan, one from Australia. Only one species was not available. The conspicuous differences illustrated by the first male pleopods lead to the partition of Dorippe into five different taxa; two new genera and two new sub-genera are added to Dorippe sensu stricto
SOME WATER CHARACTERISTICS OF ESTUARIES IN INDONESIA
No full textThis paper describes the results obtained during several hydro-oceanographical observations of some estuaries in Indonesia to provide environmental informations. It is also an attempt to make a general interpretation of the collected data, to explain or find out the physical processes acting in these regions
SOME NOTES OF THE HYDROGRAPHIC SURVEYS IN INDONESIAN WATERS
No full textDuring the period of 1969 to 1975 "JANHIDROS" carried out several hydrographic surveys and marine investigations in the Sunda Shelf and its adjacent waters. Data obtained during these surveys has shown that the general characteristics of the area which are primarily governed by the monsoonal regime are also affected by local conditions. The purpose of this paper is to render data based on these surveys which may be useful to complement environmental information
PARTICLE SIZE CHARACTERISTICS OF RIVERBED SEDIMENTS TRANSPORTED BY TIDAL BORE ‘BONO’ IN KAMPAR ESTUARY, RIAU-INDONESIA
No full textThe presence of tidal bore in the Kampar River (locally known as ‘bono’) may influence sedimentation in the Kampar River and its estuary. Understanding sedimentation mechanisms (e.g., erosion, deposition) is important to communities along the Kampar River, which can be studied by analyzing characteristics of grain size distribution. Here, we study riverbed sediment samples collected from 17 stations using an Ekman grab sampler, accompanied by bathymetry and acoustic Doppler current profiler (ADCP) measurements. Grain size data show that the sediments are coarser upstream and gradually finer downstream. Silty sands are predominant in the upstream section of the river, sands in its river body and sandy silts in the downstream. The results indicate the influence of undular bores on grain size characteristics. We also found that the propagation of bono and Kampar River’s funnelshaped morphology cause intense scouring events of riverbed sediments. Sortation values that range between 0.332.14 suggest unstable currents that result in randomly deposited sediments. The sediment mass transfer per area is positively towards downstream at the low tidal condition. However, after the passage of the bores, the sediment mass transfer area becomes negatively towards upstream
TIDAL PATTERNS AND RESOURCE USE IN THE MUSI-BANYUASIN COASTAL ZONE OF SUMATRA
No full textTidal influence extends 100 km upriver in the coastal swamplands of Sumatra and Kalimantan. In planning development or resource use, description of local tidal variation is important since tides interact with river flow to zone the land and waters into a series of distinctive environments. The coastal swamps are being opened for rice cultivation with tidally-influenced irrigation and drainage canals. There are also forestry and fishery activities plus major shipping activities in these delta areas. The tidal patterns arc studied in the South Sumatra coastal portion of the Musi and Banyuasin River basins. The tides are mixed, predominantly diurnal with a maximum range of 3.5 m near the coast. Significant differences in tidal amplitude and phase exist between rivers separated by deltas often less than 10 km in width. Differences in river water flow atributed to season or basin characteristics influence tidal patterns. On the Musi river the relationship between tidally-influenced resource uses and distance from the sea suggests the greatest variety of activities occurs within the zone of maximum tidal range 0 to 30 km from the delta fronts. This zone should therefore be considered a region of special ecological concern. A mechanism is needed for coordinated planning of infrastructure changes likely to influence hydrology or resource uses. Predictive models should be developed for measuring the likely impact of such development on coastal hydrology
STUDIES ON THE DISTRIBUTION OF BARNACLE LARVAE AND THE BARNACLE FOULING IN THE ESTUARINE AREA OF MUARA KARANG
No full textEstuary hosts many of the meroplanktonic lives of marine animals, among which are the barnacles. The study of the seasonal abundance of the barnacle larvae and of the barnacle attachments at Muara Karang during 1975-1976 indicated that barnacle larvae and barnacle attachments occurred throughout the year. However, certain peaks of the larvae abundance and the high densities of attachment were found in certain months of the year. The peaks of larvae distribution were observed in April 1975, June 1975, September 1975, and January 1976. In general the density of the attached barnacles on panels was highest during the period of March - August, and lowest during December-February. The physical, biological, and sedimentological factors in relation with the distribution of the barnacle larvae and the density of the attached barnacles were discussed. Two governing factors seemed to be the wave and the sediment load. Relationship between the abundance of the barnacle larvae and the density of attachment was difficult to see
REPORT ON THE CORINDON CRUISES
No full textThe corindon cruises were the first realization of the Cooperation on Oceanology between the governments of France and Indonesia. The name Corindon is derived from the name of French vessel "CORIOLIS" and Indonesia to signify that the vessel was participating in marine research activities in Indonesian waters
WATER QUALITY INDICATOR BACTERIA IN BENGAWAN SOLO AND PORONG RIVERS AND THEIR ESTUARIES
No full textWater samples taken from rivers and estuaries stations in Bengawan Solo and Porong rivers in East Java were analyzed for the pollution of indicator bacteria in July-August and NovemberDecember 1984, to determine the influences of domestic wastes on the quality of these waters. Higher frequency of occurrences of high total coliform, fecal coli and fecal streptococci were observed in water samples collected in river stations, river mouths and in the vicinity of dense populated areas. The distribution of saprophytes, freshwater bacteria and indicator bacteria were also studied. The changes in the bacterial population as funciton of the salinity were shown during the observations. Some pathogenic bacteria like Salmonella, Yarsinia, and Vibrio parahaemolyticus and others have been isolated from waste and mud samples
STUDIES ON PLANKTON, PRIMARY PRODUCTION AND FISH IN THE INNER BRUNEI BAY
No full textNo abstract provide
UPPER LAYER CIRCULATION IN THE BANDA SEA IN RESPONSE TO THE ONSET OF MONSOON WINDS
No full textAspects of the upper layer circulation in the interior of the Banda Sea, Indonesia, associated with local forcing by monsoon winds are examined numerically through the use of a reduced gravity model. The basin is located between approximately 4°S and 8°S and is partially enclosed by chains of islands. The primary emphasis is an evaluation of the free wave response which contributes to the steady or slowly varying circulation. Basin response appears to be characterized by interacting Kelvin waves and Rossby at low frequencies, and by evanescent Poincare waves of higher frequencies. Passages between islands along the perimeter of the basin appear to be nearly, impermeable to Rossby waves, which contribute to a pattern of westward propagating quasi geostrophic eddies. This pattern would persist during periods of wind transition