Showing papers by "Indonesian Institute of Sciences published in 1989"
TL;DR: In this article, the community structure and the biomass distribution of seagrasses were studied along transects perpendicular to the shoreline in several locations in the Flores Sea region, and a tentative model was constructed, starting from a constant, nondistributed multispecies vegetation in the lower intertidal and subtidal zone on sand and coral rubble, and moving into several suboptimal situations.
82 citations
TL;DR: It is suggested that Indonesian waters east of the Sunda shelf are richest in coral species because of the rugged geography of the region, providing ample refuge areas during Pleistocene times.
64 citations
TL;DR: A field survey of 25 sites in Sulawesi Utara in 1987 and 1988 found macaques in 16 of these sites, suggesting its range and abundance have declined since the observations of Groves, and a shortage of juveniles and infants.
Abstract: A field survey of 25 sites in Sulawesi Utara (north Sulawesi) in 1987 and 1988 found macaques in 16 of these sites. The most viable population of Macaca nigra was found in the Tangkoko reserve at an estimated density of 76.2 monkeys/km2, which is less than one-third the abundance reported in the late 1970s by the MacKinnons. The adjacent reserves of Batuangus and Duasudara had only 22 monkeys/km2, yielding a population estimate for these three contiguous reserves of only 3,655 individuals. Maccaca nigrescens were found in the central and western portions of Dumoga-Bone National Park in densities of 15.5 and 16.4 monkeys/km2, significantly below the density of 27/km2 reported by the MacKinnons. The more peripheral areas of Dumoga-Bone had only 8.15 monkeys/km2, yielding a population estimate of M. nigrescens in Dumoga-Bone of less than 34,000. Our total population estimate for M. nigra and M. nigrescens combined is less than 50,000 individuals, which is considerably below that reported in recent litreture. M. hecki were observed in only two locations, Tangale and Panua Reserves, at low densities of 3.3 to 5.2 monkeys/km2, suggesting its range and abundance have declined since the observations of Groves (pp. 84-124 in THE MACAQUES: STUDIES IN ECOLOGY, BEHAVIOR AND EVOLUTION. D. G. Lindburg, ed. New York, Van Nostrand Reinhold, 1980). Several factors have contributed to population decline in these species: habitat shrinkage, increasing human population pressure, and drought conditions. Group sizes were significantly smaller in our study than in previous ones, and we found a shortage of juveniles and infants.
35 citations
TL;DR: In this article, three marine geophysical transects across the Banda Arc-Australian continent collision zone, east of Timor, north of Tanimbar and southeast of Seram show a variety of deformation patterns produced by the convergence.
26 citations
TL;DR: In this paper, the authors used the seismograms of 14 local earthquakes recorded by a temporary network in the Sunda Strait to construct an image of shear-wave attenuating bodies in the vicinity of the Krakatau volcanic complex.
25 citations
TL;DR: In this paper, major and trace element results for ten volcanoes show systematic spatial variations along and across the arc system and suggest that the arc-continent collision area near Timor is a local tectonic anomaly where arc volcanism is influenced not only by continental sediment/crust subduction but also by the geodynamic response to the collision event.
24 citations
TL;DR: In this article, the authors presented data from the east Sunda Arc with the volcanoes Sirung, Lewotolo, Boleng and Batu Tara, which span the compositional spectrum from arctholeiitic to high-potassium undersaturated volcanics.
24 citations
TL;DR: The Palaeozoic Wahlua complex of Southeast Buru and the Tehoru complex of Central Seram are mainly composed of graphitic phyllites/schists and arkosic quartzites with minor intercalations of marble and amphibolite as mentioned in this paper.
24 citations
TL;DR: Observations at coral reef locations in the Flores Sea region in October and November 1984 indicated that the similarities of the chaetodontid communities between locations are not related to the distance between them, but rather to habitat conditions.
22 citations
TL;DR: In this article, a comparative study of several different areas, which showed that coral cover is often very useful as an indication of the quality of reefs, was conducted. And it was found that the diversity of reef fishes is correlated with the condition of reefs as determined by the percentage cover of living coral.
21 citations
TL;DR: In this article, a marine geophysical survey of the Banda Sea, the Australian continent and the Irian Jaya microplate was conducted and the authors derived an age of just after 3 Ma for the start of wrenching in the area.
TL;DR: Spinel peridotites from Kaibobo (Seram) and Atapupu (Timor) as mentioned in this paper show a cooling and deformation history starting at 1060 to 1030°C above 8 kbar, deformed and partly recrystallized at 900 ± 40°c above 6.5 kbar until 710 ± 30°C at 5.8 to 3.7 kbar.
TL;DR: In this paper, the authors describe the structure of the benthic communities in terms of numerical density (numbers of dominant macrofaunal groups and meiofauna per square metre) and biomass (g ashfree dry weight (AFDW) per square meter), and in relation to geographical position and main ambient factors, i.e. water depth, bottom temperature and sediment characteristics.
TL;DR: An observation of the total mercury and cadmium contents in the soft tissue of Mytilus viridis L. collected from Onrust Island waters finds that the relatively small increase in ambient metal concentration due to pollution will be reflected in measurable increase in mussel metal concentration.
Abstract: Shellfish are known for their ability to accumulate trace metals from their environment. The relatively small increase in ambient metal concentration due to pollution will be reflected in measurable increase in mussel metal concentration. The abnormally high concentration of heavy metals in the surface water of Jakarta Bay has been reported. It was reported that the concentration of heavy metals tends to increase, and in surface water around Onrust Island the mercury and cadmium concentration had reached up to 35 ppb and 450 ppb, respectively. The green mussel, Mytilus viridis L., was cultivated around Onrust Island, Jakarta Bay. So far, there is no available information on mercury and cadmium contents in marine organisms from the surrounding waters of Onrust Island. The present study reports the result of an observation of the total mercury and cadmium contents in the soft tissue of Mytilus viridis L. collected from Onrust Island waters.
TL;DR: In this paper, the authors reconstructed the metamorphic history of Southeast Sulawesi by using micro-structural analysis, mineral compositions, distribution of elements over mineral pairs in equilibrium and fluid inclusion study.
TL;DR: Two hundred and ninety three fully identified species representing 203 genera and 77 families were collected from Mt. Merapi, Mt. Sago, Baso, Simarasap Forest, Ngalau Forest, Padang, Air Sirah Forest, and Ulu Gadat Forest in West Sumatra and tested for the presence of alkaloids.
Abstract: Two hundred and ninety three fully identified species representing 203 genera and 77 families were collected from Mt Merapi, Mt Sago, Baso, Simarasap Forest, Ngalau Forest, Padang, Air Sirah Forest, and Ulu Gadat Forest in West Sumatra and tested for the presence of alkaloids Positive results were obtained for 58 species representing 50 genera and 26 families
TL;DR: In this article, the concentrations of copper, zinc and cadmium in benthic organisms, representing the phyla Mollusca, Arthropoda, Echinodermata and Pisces, from the riverine and estuarine areas of the rivers Brantas and Solo (East Java) and the adjacent coastal area.
TL;DR: In this paper, the authors studied the water in Kau Bay (Halmahera, Indonesia) and showed that bottom waters in the deepest part of the bay become almost anoxic due to the complete consumption of oxygen by microbial degradation of labile organic matter.
TL;DR: In this paper, polychlorinated biphenyls (PCBs), organochlorine pesticides and their persistent metabolites were identified in epibenthic animals from the estuaries of the rivers Brantas and Solo and from Strait Madura, Strait Bali and the Java Sea.
TL;DR: Paraprionospio pinnata and Theora lata, which are considered indicator species of disharmonic environments, were found at almost every station of the study areas in both periods, and species diversity at all the stations was low.
TL;DR: In this paper, selected organochlorines were analyzed in water and suspended particulate matter collected at stations in two rivers on East Java, the adjacent coastal zone, the Java Sea and the Indian Ocean.
TL;DR: The fermentation pattern of cassava starch utilization was investigated at 37°C using Rhizopus oligosporus UQM 145 F and eight different media and the addition of zinc or zinc plus iron to a combination of calcium plus manganese switches the fermentation from glucose accumulation to biomass (single cell protein) production.
Abstract: The fermentation pattern of cassava starch utilization was investigated at 37°C using Rhizopus oligosporus UQM 145 F and eight different media. Depending on the medium used, the addition of zinc or zinc plus iron to a combination of calcium plus manganese switches the fermentation from glucose accumulation to biomass (single cell protein) production. Complete starch hydrolyzation was obtained in both cases, with a complete glucose utilization resulting in 24 g biomass containing 30% true protein per 100 g cassava starch (= 7.45 g SCP/100 g substrate) in 24 hours. In the case of glucose accumulation, biomass was kept low and 15.5 g/l glucose representing 57.3% of starch supplied were obtained in 36 hours. R. oligosporus UQM 145 F grows well between 30° and 45°C. At 45°C and pH 5.0, 7.0 g SCP/100 g substrate were obtained, which rose to 8.6 g if cassava starch is replaced by ground cassava tuber.
TL;DR: In this article, the chemical and isotopic compositions of fumarolic gases from the active volcanoes Banda Api in the Banda Archipelago, Serawerna on Teon, Wurlali on Damar and Ili Lewotolo on Lomblen are reported.
TL;DR: Together the holothuroids, echinoids and asteroids collected by the Snellius-II Expedition represent 144 different species, which includes 14 species new to science and five new records for the Austro-Malayan region.
TL;DR: In this article, the authors identify five factors that influence the chemistry of Kau Bay sediments: an aluminosilicate, a carbon-sulphur, a biogenic carbonate, an authigenic carbonate and a detrital mineral factor.
TL;DR: A radiometric age determination by means of KAr and fission track method was carried out on the Sigura-gura Formation, upper part of the “Toba Tuffs” in Sumatra, Indonesia as mentioned in this paper.
TL;DR: The authors suggest that the location of a proposed reserve be shifted to include more of the most favorable habitat, i.e., alluvial forest.
Abstract: The oceanic island of Simeulue, west of Sumatra, is inhabited by a distinct subspecies of the long-tailed macaque (Macaca fascicularis fusca) [Miller, 1903]. In January 1982 and March 1984, a survey was conducted to establish its population status. The monkey is morphologically different from other Sunda shelf M. fascicularis populations. In productive habitats, it lives in small groups (10-15 individuals) and reaches a density of more than one monkey/hectare (ha). The island's total population is estimated to be at least 50,000. The authors suggest that the location of a proposed reserve be shifted to include more of the most favorable habitat, i.e., alluvial forest.
TL;DR: In this article, Coedes has shown that despite local differences and regional variations, this region shares similar sense of unity and that Indianisation or, rather, Indianisation in statecraft and religion was the basis of this unity.
Abstract: One may not always agree with the term used as the title of the book, but in his already classic study on ancient Southeast Asia, Coedes has shown that despite local differences and regional variations, this region shares similar sense of unity. Hinduisation or, rather, Indianisation in statecraft and religion was the basis of this sense of unity. Not only were Sanskrit and Pali the official languages of the original texts of the religion, Hinduisation also provided commonly shared high cultural symbols. In other words, despite political instability in inter-state relations and trading competition that continued to disturb whatever type of stability had been attained, the world of Southeast Asia, and particularly the historic Indonesian archipelago, shared a number of cultural traits, that were clearly manifested in the conduct of political affairs and religion.
TL;DR: In this paper, chemical analyses of ferromanganese encrustations found on the seabed west of Misool, eastern Indonesia, indicate that these deposits formed in a way different from that of world-wide occurring manganese nodules.
TL;DR: During the Snellius-II Expedition beachines and gill nets were used to sample the fish fauna of reef flats and reef edges of Flores Sea reefs, showing a remarkable diversity of fish occurring in both habitats.