Marine Research in Indonesia (MRI - E-Journal)
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THE POTENTIALLY TOXIC BENTHIC DINOFLAGELLATES ON MACROALGAE AT THE REEF FLAT OF SERIBU ISLANDS, NORTH JAKARTA - INDONESIA
No full textThe Ciguatera Fish Poisoning (CFP) causing microorganisms were observed at the reef flat of Penjaliran Barat Islands and Pramuka Islands District, Seribu Island National Park, North Jakarta, Indonesia. Of the samples collected, four potentially toxic benthic dinoflagellates species were found, which are Gambierdiscus toxicus, Prorocentrum concavum, Prorocentrum lima, and Ostreopsis lenticularis. The dinoflagellates were found attached on the brown macroalgae Padina and Sargassum. Most of the benthic dinoflagellates from both locations were found in Pramuka Islands District, the inhabitated islands where human activities which could damage the coral reef areas were relatively high. Beside the macroalgae substrate preference of each dinoflagellate species, several environmental factors were also obtained in this research
DISTRIBUTION AND ABUNDANCE OF MAJOR ZOOPLANKTON GROUPS IN AMBON BAY (MALUKU, INDONESIA) DURING A SALP SWARMING, WITH NOTES ON CHAETOGNATHA AND PTEROPODA SPECIES
No full textEight zooplankton samples from several stations along a line from the inner to the outermost part of Ambon Bay were studied. In the samples from the Inner Bay, the salp Thalia sibogae SOEST outnumbers all other groups. The competition for food is responsible for relatively low numbers of these groups. At the Outer Bay stations the Copepoda is by far the most abundant group.TGraphs indicating the numbers of specimens per m3 of each of the seventeen groups are given for three groups of stations, of which the central one appeared to be the richest.The Chaetognatha, Pteropoda, and oblong fish eggs were identified. Oxygen and reactive phosphorus are presumed to be more connected with differences in planktonic life in Ambon Bay than temperature and salinity.Because of the importance of the live-bait fishery, and the threat of increasing pollution, a call in made for more extensive surveys
A FORMULATION APPROACH TO QUANTIFY THE ABUNDANCE OF CORAL GENERA
No full textA formulation approach to quantify the abundance of coral genera is considered important to obtain basic information necessary in determining the potency and condition of coral, and one application can also be used to set quota for coral trade. The line intercept method has been used in five different area throughout Indonesian archipelago representing prestine area to heavy disturbances. Based on the number of occurrence, the genera dominance, the size of colony and the coral coverage in each study area was assigned scale, weight and value. The calculation gave the range of Total Value (TV) from 5 -20 and the assignment abundance category of coral genera is 17-20 very common, 14-16 common, 11-13 uncommon, 8 -10 rare, and 5-7 very rare. The categorization of each coral genus of certain area can be used to consider whether it can be harvested or not. Suggestion based on this study as follow: coral genera categorized as "very common" can be harvest, coral genera categorized as "common" can be harvest with caution, coral genera categorized as "uncommon", harvest are limited, coral genera as "rare", harvest are strictly limited and coral genera as "very rare" are prohibited to harvest
A PRELIMINARY STUDY ON THE GROWTH AND FOOD OF STOLEPHORUS SPP. FROM THE JAKARTA BAY
No full textThe length compositions of Stolephorus heterolobus, Stolephorus insularis and Stolephorus pseudoheterolobus were observed. S. heterolobus ranged from 25 to 71 mm., S. insularis from 27 to 75 mm and S. pseudoheterolobus from 27 to 67 mm standard length. The ages of these three species were estimated. The asymptotic length of S. heterolobus was 97 mm attained at the age of 26 months, S. insularis 86 mm at 26 months and S. pseudohetorolobus 88 mm at 20 months. The highest growth rate of S. heterolobus was at the size group 30 - 80 mm standard length, that of S. insularis was at 30-50 mm, and that of S. insularis was observed to be the lowest. The stomach contents of S. heterolobus and S. pseudoheterolobus were studied tand were found that the food of these two species was more or less the same. They fed mainly on zooplankton consisting of copepods and other crustaceans
ESTUARINE MANAGEMENT AREAS: A PRIORITY RANKING SYSTEM
No full textThe Queensland Fisheries Service is the instrumentality responsible for administration of fisheries matters within Queensland, Australia. The Fisheries Act provides legislation to protect, conserve, manage and develop the aquatic resources of the State. As a means of evaluating resource data a priority ranking system is proposed which provides for both quantitative and qualitative assessments of estuaries in terms of regional planning for best land use
ECOLOGY OF SOME MARINE LAGOONS ALONG THE EAST-COAST OF INDIA WITH SPECIAL REFERENCE TO THE MANAGEMENT AND UTILISATION OF THEIR RESOURCES
No full textThe marine lagoons along the east coast of India such as the Chilka-lake in Orissa State, the Pulicat and the Ennore lakes near Madras, Silvatturai lagoon in Tuticorin, and the Mandapam lagoon in Ramanathapuram are shallow, vast sheets of saline water whose physical and chemical characteristics are quite different from the backwaters of the west coast and constitute distinct categories of biological environment. The main characteristic feature of these lagoons is that they are connected to the sea by a narrow mouth which is closed by a sand bar for varying periods of the year. One or more seasonal rivers open into some of these lagoons and flood them during the monsoon. The land run-off during monsoon is the only source of freshwater for others. The bar-mouth connection with the sea is opened by the thrust of the flood waters aided in some cases by human effort. This opening operates for a few months between November — December and June - July or throughout during some years following heavy monsoon. The closure occurs by general silting and formation of a sand bar
HARPACTICOID COPEPODS ASSOCIATED WITH HERMIT CRABS IN THE MOLUCCAS
No full textPaguridea in the Indo-Pacific have 10 harpacticoid copepod associates: 3 Sunaristes, 3 Brianola, 1 Porcellidium, and 3 Paraidya. Four of these copepods are reported from hermit crabs in the Moluccas: Sunaristes tranteri Hamond, 1973, from Dardanus guttatus, Dardanus lagopodes, Calcinus latens, Calcinus minutus, Calcinus gaimardi, Calcinus sp., and Trizopagurus strigatus; Porcellidium brevicaudatum Thompson and A. Scott, 1903, from Dardanus guttatus, Dardanus lagopodes, Dardanus megistos, Calcinus latens, Calcinus minutus and Trizopagurus strigatus; Paraidya minor Sewell, 1940, and Paraidya major Sewell, 1940, from Dardanus guttatus, Dardanus lagopodes, and Dardanus megistos
TIMING OF LARVAL RELEASE BY REEF CORAL Pocillopora damicornis AT PANJANG ISLAND, CENTRAL JAVA
No full textMonthly larval release by the coral Pocillopora damicornis at Panjang Island, Central Java was investigated. Corals were collected from windward and leeward and maintained in outdoor, flow-trough system to quantify nightly release of larvae. Larval release of the coral occurs every month throughout the year, and its planulation increased during dry monsoon. Monthly planulation occurs from new moon to full moon and possesses in different pattern between single and paired colonies. Planulation in paired colonies occurred in single peak and more synchronized in each colony however single colonies planulated in double peaks and less synchronized in each colony. This study confirmed that planulation period of P. damicornis at Panjang Island over a range of lunar phases with shorter periods of peak release which predominantly controlling by tidal range rather than lunar cycle
TIDAL REGIMS OF ARAFURA AND TIMOR SEA
No full textTidal range in the Arafura and Teimor Sea region is estimated from the actual field records collected by five tidal stations during March 2011. These stations include Rote and Saumlaki tidal stations of Badan Koordinasi Survei dan Pemetaan Nasional (Bakosurtanal) Indonesia, and Broome, Darwin and Groote Eylandt tidal stations of Australia Bureau of Meteorology (BoM). In addition to data from these stations, datasets of sea surface height obtained from Topex/Poseidon altimetry at seven (7) virtual stations were used. Generally, the results of this study are in agreement with that of Wyrtki (1961). However, by utilizing spectral analysis and form factor, this study shows difference in terms of tidal types from that of Wyrtki's, particularly at Karumba and Groote Eylandt stations
PRACTICAL GUIDELINES FOR ASSESSING CORAL CALCIFICATION VIA COMPUTED TOMOGRAPHY
No full textCoral calcification as the product of extension rate and skeletal density, is projected to change under marine environmental changes of local (e.g., sedimentation, eutrophication) and global (e.g., warming, ocean acidification) scales. For the regional effort to monitor the ecological impacts of ocean acidification on coral reef ecosystems, the Intergovernmental Oceanographic Commission Sub-Commission for the Western Pacific (IOC-WESTPAC) has incorporated an interdisciplinary approach that includes monitoring of seawater carbonate parameters, coral calcification, net calcification minus bioerosion, and reef community structure. Currently, there is a need to formulate a standard operating procedure (SOP) for assessing coral calcification over the recent years via coral cores. The SOP needs to yield accurate data in a cost-effective way that can be applied by researchers in the region. High variation of coral calcification parameters between coral colonies warrants a sufficiently large number of samples thus a rapid method for analyzing coral extension rate, skeletal density, and calcification. This paper outlines practical guidelines for assessing coral calcification from the field to laboratory using the three-dimensional computed tomography (CT) method