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Marine Research in Indonesia
ISSN : 02162873     EISSN : 24432008
MARINE RESEARCH IN INDONESIA (MRI) has been published since 1956 by Indonesia's oldest marine research institute, the Research Center for Oceanography of LIPI (Indonesian Institute of Sciences). MRI focuses on physical, chemical, biological, geological oceanographic as well as coastal management studies in the Indonesian seas and the adjacent Indo-Pacific region.
Articles
290
Articles
PRACTICAL GUIDELINES FOR ASSESSING CORAL CALCIFICATION VIA COMPUTED TOMOGRAPHY

Nurhati, Intan Suci

Marine Research in Indonesia Vol 43 No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

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Abstract

Coral 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.

ISOLATE OF HETEROTROPHIC MICROALGAE AS A POTENTIAL SOURCE FOR DOCOHEXAENOIC ACID (DHA)

Julianti, Elin, Fathurohman, Mochamad, Damayanti, Sophi, Kartasasmita, Rahmana Emran

Marine Research in Indonesia Vol 43, No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

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Abstract

Docosahexaenoic acid (DHA) is one of essential fatty acids that are beneficial to health. Nowadays, the source of docosahexaenoic acid (DHA) is mainly obtained from fish which are extracted into fish oil products. However, the fish oil products still have some drawbacks in term of purity, acceptable flavor for costumers, and also their not environmental friendly production process. As an alternative solution, heterotrophic microalgae can be used as a potential source for DHA due to their excellence compared to fish oil products. The aim of this study is to isolate the heterotropic microalgae that can produce DHA. The heterotrophic microalgae were isolated from mangrove fallen leaves (Rhizophora apiculata) by using direct planting method. The morphology of pure microalgae colony were observed through light microscope and subsequently fermented for 14 days. Fatty acids were extracted and methylated through direct transesterification method. Identification and quantification of DHA were conducted by using gas chromatography. The results were four isolates of heterotropic microalgae, namely MTKC1, MTKC2, MTKC3, and MTKC4. The extract of MTKC2 that only showed the content of DHA with value of 9.2 % w/w. Therefore MTKC2 is a potential source for DHA. The MTKC2 was further identified by using molecular biology method and confirmed as Thraustochytrium aureum.

ISOLATE OF HETEROTROPHIC MICROALGAE AS A POTENTIAL SOURCE FOR DOCOHEXAENOIC ACID (DHA)

Julianti, Elin, Fathurohman, Mochamad, Damayanti, Sophi, Kartasasmita, Rahmana Emran

Marine Research in Indonesia Vol 43 No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Original Source | Check in Google Scholar | Full PDF (2269.65 KB)

Abstract

Docosahexaenoic acid (DHA) is one of essential fatty acids that are beneficial to health. Nowadays, the source of docosahexaenoic acid (DHA) is mainly obtained from fish which are extracted into fish oil products. However, the fish oil products still have some drawbacks in term of purity, acceptable flavor for costumers, and also their not environmental friendly production process. As an alternative solution, heterotrophic microalgae can be used as a potential source for DHA due to their excellence compared to fish oil products. The aim of this study is to isolate the heterotropic microalgae that can produce DHA. The heterotrophic microalgae were isolated from mangrove fallen leaves (Rhizophora apiculata) by using direct planting method. The morphology of pure microalgae colony were observed through light microscope and subsequently fermented for 14 days. Fatty acids were extracted and methylated through direct transesterification method. Identification and quantification of DHA were conducted by using gas chromatography. The results were four isolates of heterotropic microalgae, namely MTKC1, MTKC2, MTKC3, and MTKC4. The extract of MTKC2 that only showed the content of DHA with value of 9.2 % w/w. Therefore MTKC2 is a potential source for DHA. The MTKC2 was further identified by using molecular biology method and confirmed as Thraustochytrium aureum.

SEAGRASS POPULATION CONNECTIVITY IN THE SOUTH CHINA SEA

Hernawan, Udhi Eko

Marine Research in Indonesia Vol 43, No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Original Source | Check in Google Scholar | Full PDF (336.704 KB)

Abstract

Seagrass plays important ecological roles and ecosystem services, yet degrading alarmingly in the South China Sea (SCS), one of the largest marginal seas of the Western Pacific. As connectivity is a vital component in population persistence, understanding of connectivity is of importance for effective seagrass conservation management. In the South China Sea, our understanding of connectivity is mainly based on studies in fishes and invertebrates. Connectivity in seagrass populations, on the other hand, is still poorly investigated. In this review, I predict that genetically structured population of seagrass is likely to occur in the SCS. Future research on seagrass connectivity should include (i) investigation on the pattern of connectivity at a local and broader-regional scale, and (ii) investigation on processes involved in the seagrass connectivity. These investigations are aimed to improve our knowledge of seagrass connectivity and to contribute in providing a solid framework for seagrass restoration/transplantation and spatial planning of seagrass management.

SPATIAL VARIATION IN POPULATION CHARACTERISTICS OF VENUS CLAM GAFRARIUM TUMIDUM RÖDING, 1798 (BIVALVIA: VENERIDAE) IN AMBON BAY, MALUKU

Islami, Muhammad Masrur, Bengen, Dietriech Geoffrey, Dody, Safar

Marine Research in Indonesia Vol 43, No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

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Abstract

Ambon Bay consists of two regions i.e. Inner and Outer Ambon Bay that was separated by Galala-Poka sill. Consequently these waters have different local environmental conditions that leads to the bivalve populations differences, one of them is venus clam Gafrarium tumidum. In this study, the distribution and spatial variation in population characteristics of of venus clam was quantified based on the analysis of their twelve shell dimensions from different populations. Fieldwork and analyses were conducted on April – Juni 2013. Total of 585 individuals of venus clam were found and could be divided into ten size-classes and three size categories i.e. small (< 23.11 mm), medium (23.12–32.05 mm) and large size (> 32.06 mm). The highest size-class density was found at medium size. Spatial distribution was related to the characteristics of sediment and other potential factors. Result of discriminant analysis showed that shell-width (SW) was the variable with the highest discriminating power and distinguishing between Inner and Outer Ambon Bay populations.

MANGROVE BRACHYURAN CRABS IN WORI, NORTH SULAWESI, INDONESIA

Pratiwi, Rianta, Widyastuti, Ernawati

Marine Research in Indonesia Vol 43, No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Original Source | Check in Google Scholar | Full PDF (723.73 KB)

Abstract

The study for faunal diversity from mangrove sites in Wori were very less work carried out, especially on brachyuran crab taxa. Healthy mangrove forests provide  a critical for many species of Crabs in intertidal and estuarine areas are keys to healthy marine ecology. Mangroves are the most suitable feeding, breeding and nursery grounds for crabs and other crustaceans. In this study, the habitat distribution and diversity of crabs in Wori mangrove environment was recorded from  October 2015 and August 2016. In view of the significance of the mangrove habitat, in present study we selected three station with different habitat specifications as in  Wori Seaward (WSW), Wori Middle zone (WMZ) and Wori Landward (WLW). Total 15 species and 307 individuals of brachyuran crabs were recorded belonging to 10 genera and 6 families. Crabs belonging to family Sesarmidae was most dominant with 7 species. The other major outcome of study was maximum diversity was found at Wori Landward (WLW) site with 13 species, followed by Middle Zone (WMZ) site with 11 species and Wori Seaward (WSW) site with 10 species. Keywords: Brachyuran crabs, mangroves, mud flats, estuary, Wori, Bitung, North Sulawesi Indonesia

CHEMICAL COMPOSITIONS OF TWO BROWN SEAWEED SPECIES FROM KARIMUN JAWA, INDONESIA

Siahaan, Evi Amelia, Asaduzzaman, A.K.M., Pangestuti, Ratih

Marine Research in Indonesia Vol 43, No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

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Abstract

Seaweeds are potentials to be developed as alternative source in foods and pharmaceuticals. In this study, chemical compositions of two brown seaweeds species from Karimun Java Indonesia Padina australis and Turbinaria conoides were investigated. Proximate results showed that both seaweeds contain high amount of carbohydrates and ashes. Mineral contents of P. australis and T. conoides follow the orders of Na>Mg>Fe>K>Ca>Zn>Cu and Na>Mg>K>Fe>Zn>Ca>Cu, respectively. Almost all essential amino acids (including histidine, isoleucine, leucine, phenylalanine, threonine, valine and lysine) were present in both seaweeds. Amino acid profiles showed that both seaweed contain polyunsaturated fatty acids (PUFA) with T. conoides contain higher amount of EPA (8.58 ± 0.22 g/100 g of total fatty acids) and DHA (6.05 ± 0.21 g/100 g of total fatty acids). The findings of this study have provided evidence that brown seaweeds were nutritious and potential to be utilized for producing functional ingredients in food. Further, P. australis and T. conoides can be used as candidate to be used in food industries to increase shelf-life of food items for human consumption, and use to deter deleterious free radical-induced life-threatening diseases.

SPATIAL VARIATION IN POPULATION CHARACTERISTICS OF VENUS CLAM GAFRARIUM TUMIDUM RÖDING, 1798 (BIVALVIA: VENERIDAE) IN AMBON BAY, MALUKU

Islami, Muhammad Masrur, Bengen, Dietriech Geoffrey, Dody, Safar

Marine Research in Indonesia Vol 43 No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Original Source | Check in Google Scholar | Full PDF (649.372 KB)

Abstract

Ambon Bay consists of two regions i.e. Inner and Outer Ambon Bay that was separated by Galala-Poka sill. Consequently these waters have different local environmental conditions that leads to the bivalve populations differences, one of them is venus clam Gafrarium tumidum. In this study, the distribution and spatial variation in population characteristics of of venus clam was quantified based on the analysis of their twelve shell dimensions from different populations. Fieldwork and analyses were conducted on April – Juni 2013. Total of 585 individuals of venus clam were found and could be divided into ten size-classes and three size categories i.e. small (< 23.11 mm), medium (23.12–32.05 mm) and large size (> 32.06 mm). The highest size-class density was found at medium size. Spatial distribution was related to the characteristics of sediment and other potential factors. Result of discriminant analysis showed that shell-width (SW) was the variable with the highest discriminating power and distinguishing between Inner and Outer Ambon Bay populations.

SEAGRASS POPULATION CONNECTIVITY IN THE SOUTH CHINA SEA

Hernawan, Udhi Eko

Marine Research in Indonesia Vol 43 No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Original Source | Check in Google Scholar | Full PDF (336.704 KB)

Abstract

Seagrass plays important ecological roles and ecosystem services, yet degrading alarmingly in the South China Sea (SCS), one of the largest marginal seas of the Western Pacific. As connectivity is a vital component in population persistence, understanding of connectivity is of importance for effective seagrass conservation management. In the South China Sea, our understanding of connectivity is mainly based on studies in fishes and invertebrates. Connectivity in seagrass populations, on the other hand, is still poorly investigated. In this review, I predict that genetically structured population of seagrass is likely to occur in the SCS. Future research on seagrass connectivity should include (i) investigation on the pattern of connectivity at a local and broader-regional scale, and (ii) investigation on processes involved in the seagrass connectivity. These investigations are aimed to improve our knowledge of seagrass connectivity and to contribute in providing a solid framework for seagrass restoration/transplantation and spatial planning of seagrass management.

MANGROVE BRACHYURAN CRABS IN WORI, NORTH SULAWESI, INDONESIA

Pratiwi, Rianta, Widyastuti, Ernawati

Marine Research in Indonesia Vol 43 No 2 (2018)
Publisher : Research Center for Oceanography - Indonesian Institute of Sciences (LIPI)

Show Abstract | Original Source | Check in Google Scholar | Full PDF (723.73 KB)

Abstract

The study for faunal diversity from mangrove sites in Wori were very less work carried out, especially on brachyuran crab taxa. Healthy mangrove forests provide  a critical for many species of Crabs in intertidal and estuarine areas are keys to healthy marine ecology. Mangroves are the most suitable feeding, breeding and nursery grounds for crabs and other crustaceans. In this study, the habitat distribution and diversity of crabs in Wori mangrove environment was recorded from  October 2015 and August 2016. In view of the significance of the mangrove habitat, in present study we selected three station with different habitat specifications as in  Wori Seaward (WSW), Wori Middle zone (WMZ) and Wori Landward (WLW). Total 15 species and 307 individuals of brachyuran crabs were recorded belonging to 10 genera and 6 families. Crabs belonging to family Sesarmidae was most dominant with 7 species. The other major outcome of study was maximum diversity was found at Wori Landward (WLW) site with 13 species, followed by Middle Zone (WMZ) site with 11 species and Wori Seaward (WSW) site with 10 species. Keywords: Brachyuran crabs, mangroves, mud flats, estuary, Wori, Bitung, North Sulawesi Indonesia