The study aimes to examine the accumulation level of selected heavy metal Cd in various of common... more The study aimes to examine the accumulation level of selected heavy metal Cd in various of common mud crab ( Scylla spp.) samples from Segara Anakan Lagoon-Cilacap. Mangrove crab and sediment samples were taken from Segara Anakan (108046’–109005’E; 7034’–7048’S) and were analyzed using Atomic Absorption Spectrophotometer (AAS). The Cd extent in Scylla spp. varied from 0.084 - 0.273 ppm which still below the European Commission (2006) threshold value (0.5 ppm). On the other hand Cd concentration in sediment for most stations value (0.625 - 1.635 ppm) have exceeded the Interim marine sediment quality guidelines (ISQGs value; 0.7 ppm) except for station 2 and 4. Concerning the sediment, to interpret and assess the contamination status four indices were used, namely Contamination Factor (CF), Enrichment Factor (EF), Pollution Load Index (PLI), and Geoaccumulation Index ( Igeo ). The results show the Segara Anakan sediment value for CF varied 3.125 - 8.175, EF was 50.481, PLI was 5.381 a...
IOP Conference Series: Earth and Environmental Science, 2022
Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have conta... more Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have contaminated the conch snail species Strombus sp. and sediments in the waters of North Bintan. This study aims to provide a basic report on the number of stranded plastic crumbs (micro) and the contamination level in conch Snails (Strombus sp.) In North Bintan waters. The methods used in this research are survey and quantitative methods. Determination of the location point by purposive sampling. The procedure is divided into two stages: quadrant sampling in the field and analysis of microplastic particles in the laboratory with H2O2 liquid as an oxidizing agent and ZnCl2 solution as a microplastic determinant with a floating system. 16.4 ± 31.6 particles/individuals. Meanwhile, the level of contamination that occurs in Strombus sp. experienced in Pengudang Village by 88%, which means that on average each individual at the Pengudang station has the potential to be contaminated with 22 micropla...
IOP Conference Series: Earth and Environmental Science, 2021
The objective of this research was to collect the comprehensive information about the characteris... more The objective of this research was to collect the comprehensive information about the characteristics of sea waves in the northern and eastern of Bintan Island Sea based on differentiation in oceanographic conditions between the north and east coast of Bintan Island. The north coast of Bintan Island faces the open seas directly with a potential high wave and cause several characters of coastal damage, including coastal abrasion. The characteristics of sea waves are obtained by forecasting, namely converting wind speed values using the SPM (Shore Protection Manual) method. The results of this study collected comprehensive information of sea waves on the north coast during the 2015-2019 period showed a dominant pattern with the direction of sea wave propagation from north and south, while for the eastern region the wave propagation trends prevailing from north and southeast. The maximum sea wave height in the northern of Bintan Island Sea reaches 3.32 m with a period of 8.70 s while i...
The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated... more The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated. The two-dimensional numerical model of Oil Spill Analysis (SA) was used to simulate oil spill dispersion. The simulation showed that for daily period, the oil dispersion was dominated by advection processes due to tidal current. When South-East Monsoon (SEM) active the oil spill propagate into the eastern of the Timor sea until 300km long at the end of simulation. The high value of the exposure time lay on the Northern part of the Timor sea and the coast of the Roti island. The comparsion of the numerical results and SAR images was done by calculation of contaminant area show a good agreement.
Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sedim... more Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sediment from 28 sites Djibouti city. The concentrations of trace elements varied from 0 to 288.1mg/kg with relative abundance of trace metals in sediments was in the order of Zn>Cu>Ni>Cr>Co>Pb>Cd. Zn, Cu and Ni exceeded consensus based sediment quality guideline values 7, 14, 15 sites respectively. Enrichment factor and pollution load index showed relatively low to moderate contamination. The concentrations of total 16 PAHs varied widely depending on the sample location and ranged from 2.65 to 3760.11ng·g(-1), with the mean concentration value of 387.87ng·g(-1). Compositions and relative abundance of individual PAH using molecular diagnostic ratio using congener's m/z 178 and 202 indicated pyrolytic origin and reflecting a petroleum combustion, grass/wood and coal combustion and a petrogenic source. This study represents the first pollution baseline and a reference for ...
The herbivorous fishes have been considered as a critical functional group and have capability ma... more The herbivorous fishes have been considered as a critical functional group and have capability maintaining coral reef resilience and avoiding coral-algal phase-shifts. The present condition shown, almost in tropical reef location, alga has dominated coral, even in the small outer island. The requirement to conduct comprehensive basic research in studying the patterns and composition of herbivorous fish, especially on the small outer islands. Twelve coral reef sites in eastern Indonesia (Liki Islands) and western Indonesia (Natuna Island) used as a research location for comparing the structure patterns of herbivorous fish communities (diversity, density, and body size) using the Underwater Visual Census (UVC) method. There was different pattern of herbivorous fishes families in Liki Island and Natuna Islands, where Acanthuridae is dominant in eastern Indonesia (Liki Islands), including Ctenochaetus striatus (41,00 ± 11,72 se) individuals/350m2, A. maculiceps (23,33 ± 13,61 se) indivi...
IOP Conference Series: Materials Science and Engineering, 2016
Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively usi... more Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively using GC/MS method in eight coastal stations located in the Jakarta Bay, North of Jakarta, Indonesia. The total concentrations n-alkanes have ranged from 480 mu g.kg(-1) to 1,935 mu g.kg(-1) sediment dry weight. Several ratios (e.g. CPI24-32, NAR, TAR, Pr/Phy, n-C-17/Pr, n-C-18/Phyt, n-C-29/n-C-17, Sigma n-alkanes/n-C16LMW/HMW, Paq and TMD) were used to evaluate the possible sources of terrestrial-marine inputs of these hydrocarbons in the sediments. The various origins of aliphatic hydrocarbons were generally biogenic, including both terrigenous and marine, with an anthropogenic pyrolytic contribution (petrogenic and biogenic combustion). Two stations (G,H) were thehighest concentration and had potential risk to environment
IOP Conference Series: Materials Science and Engineering, 2016
Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseill... more Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseille, France,have been analysed using GC-QQQ/MS for their hydrocarbons (n-alkanes and polyaromatic hydrocarbons (PAHs)) extentwith two different solvent extraction, such as heptane:dichloromethane (HEP:DCM;1:1) and heptane:acetone (HEP:ACE; 1:1). The results showed hydrocarbons yielded from heptane:acetone extractionwere 28335 μg.kg- 1mussels dw (Ʃ n-alkanes C15-34) and 202 μg.kg-1mussels dw(ƩPAHs) while the yield from heptane:DCM extract was lower ca. 27026 μg.kg-1musselsdw and 133 μg.kg-1 mussels dw respectively from the Ʃn-alkanesC15-34and ƩPAHs. High hydrocarbon levels can be affected by the presence of lipids or other metabolites in mussels that have the same polarity with hydrocarbon compounds which has interferred the measurement. Several ratio parameter of n- alcanes and PAHs source in the mussels were evaluated to asses the origins of their hydrocarbons in mussels from which we suggested origins of hydrocarbons were pyrolytic and biogenic rather than petrogenic.
Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation ... more Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation and phospholipid fatty acid (PLFA) composition in either non-contaminated (NC) or contaminated (C) sedimentary microcosms with a crude oil. An analytical procedure was developed to extract both hydrocarbons and PLFAs from the same culture. PLFAs were analyzed over time during an aerobic microcosm experiment (0–21 days) to obtain a better
Background and aims – The present study aims to describe a new species of pennate blue diatom fro... more Background and aims – The present study aims to describe a new species of pennate blue diatom from the genus Haslea, H. nusantara sp. nov., collected from Semak Daun Island, the Seribu Archipelago, in Indonesian marine waters. Methods – Assessment for species identification was conducted using light microscopy, Scanning Electron Microscopy and molecular techniques. The morphological characteristics of H. nusantara have been described, illustrated and compared to other morphologically similar blue Haslea taxa, distributed worldwide. Additionally, molecular characterization was achieved by sequencing plastidial and mitochondrial genomes. Key results – This new species, named Haslea nusantara, cannot be discriminated by its morphology (stria density) but it is characterized by its gene sequences (rbcL chloroplast gene and cox1 mitochondrial gene). Moreover, it differentiates from other blue Haslea species by the presence of a thin central bar, which has been previously reported in non-...
Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-m... more Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-metalcontaminations in the sea. In this research, the concentrations of four elements Ni, Cu, Zn and Cd in P. viridis and in the serum of rat which orally feed by P. viridis were determined by Atomic Absorption Spectrometry (AAS) following dry acid digestion. Parameter analysis was evaluated by determining confidence limit for the obtained results. The result showed that there was a sequence of heavy-metal content in green mussels sample and laboratory rats serum, such as Ni < Cd…
The study aimes to examine the accumulation level of selected heavy metal Cd in various of common... more The study aimes to examine the accumulation level of selected heavy metal Cd in various of common mud crab ( Scylla spp.) samples from Segara Anakan Lagoon-Cilacap. Mangrove crab and sediment samples were taken from Segara Anakan (108046’–109005’E; 7034’–7048’S) and were analyzed using Atomic Absorption Spectrophotometer (AAS). The Cd extent in Scylla spp. varied from 0.084 - 0.273 ppm which still below the European Commission (2006) threshold value (0.5 ppm). On the other hand Cd concentration in sediment for most stations value (0.625 - 1.635 ppm) have exceeded the Interim marine sediment quality guidelines (ISQGs value; 0.7 ppm) except for station 2 and 4. Concerning the sediment, to interpret and assess the contamination status four indices were used, namely Contamination Factor (CF), Enrichment Factor (EF), Pollution Load Index (PLI), and Geoaccumulation Index ( Igeo ). The results show the Segara Anakan sediment value for CF varied 3.125 - 8.175, EF was 50.481, PLI was 5.381 a...
IOP Conference Series: Earth and Environmental Science, 2022
Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have conta... more Microplastics, which are crumbled plastic waste measuring less than 5 mm, are known to have contaminated the conch snail species Strombus sp. and sediments in the waters of North Bintan. This study aims to provide a basic report on the number of stranded plastic crumbs (micro) and the contamination level in conch Snails (Strombus sp.) In North Bintan waters. The methods used in this research are survey and quantitative methods. Determination of the location point by purposive sampling. The procedure is divided into two stages: quadrant sampling in the field and analysis of microplastic particles in the laboratory with H2O2 liquid as an oxidizing agent and ZnCl2 solution as a microplastic determinant with a floating system. 16.4 ± 31.6 particles/individuals. Meanwhile, the level of contamination that occurs in Strombus sp. experienced in Pengudang Village by 88%, which means that on average each individual at the Pengudang station has the potential to be contaminated with 22 micropla...
IOP Conference Series: Earth and Environmental Science, 2021
The objective of this research was to collect the comprehensive information about the characteris... more The objective of this research was to collect the comprehensive information about the characteristics of sea waves in the northern and eastern of Bintan Island Sea based on differentiation in oceanographic conditions between the north and east coast of Bintan Island. The north coast of Bintan Island faces the open seas directly with a potential high wave and cause several characters of coastal damage, including coastal abrasion. The characteristics of sea waves are obtained by forecasting, namely converting wind speed values using the SPM (Shore Protection Manual) method. The results of this study collected comprehensive information of sea waves on the north coast during the 2015-2019 period showed a dominant pattern with the direction of sea wave propagation from north and south, while for the eastern region the wave propagation trends prevailing from north and southeast. The maximum sea wave height in the northern of Bintan Island Sea reaches 3.32 m with a period of 8.70 s while i...
The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated... more The dynamical properties of the Montara oil spill in August 2009 in the Timor Sea is investigated. The two-dimensional numerical model of Oil Spill Analysis (SA) was used to simulate oil spill dispersion. The simulation showed that for daily period, the oil dispersion was dominated by advection processes due to tidal current. When South-East Monsoon (SEM) active the oil spill propagate into the eastern of the Timor sea until 300km long at the end of simulation. The high value of the exposure time lay on the Northern part of the Timor sea and the coast of the Roti island. The comparsion of the numerical results and SAR images was done by calculation of contaminant area show a good agreement.
Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sedim... more Selected heavy metals and polycyclic aromatic hydrocarbons (PAHs) were determined in marine sediment from 28 sites Djibouti city. The concentrations of trace elements varied from 0 to 288.1mg/kg with relative abundance of trace metals in sediments was in the order of Zn>Cu>Ni>Cr>Co>Pb>Cd. Zn, Cu and Ni exceeded consensus based sediment quality guideline values 7, 14, 15 sites respectively. Enrichment factor and pollution load index showed relatively low to moderate contamination. The concentrations of total 16 PAHs varied widely depending on the sample location and ranged from 2.65 to 3760.11ng·g(-1), with the mean concentration value of 387.87ng·g(-1). Compositions and relative abundance of individual PAH using molecular diagnostic ratio using congener's m/z 178 and 202 indicated pyrolytic origin and reflecting a petroleum combustion, grass/wood and coal combustion and a petrogenic source. This study represents the first pollution baseline and a reference for ...
The herbivorous fishes have been considered as a critical functional group and have capability ma... more The herbivorous fishes have been considered as a critical functional group and have capability maintaining coral reef resilience and avoiding coral-algal phase-shifts. The present condition shown, almost in tropical reef location, alga has dominated coral, even in the small outer island. The requirement to conduct comprehensive basic research in studying the patterns and composition of herbivorous fish, especially on the small outer islands. Twelve coral reef sites in eastern Indonesia (Liki Islands) and western Indonesia (Natuna Island) used as a research location for comparing the structure patterns of herbivorous fish communities (diversity, density, and body size) using the Underwater Visual Census (UVC) method. There was different pattern of herbivorous fishes families in Liki Island and Natuna Islands, where Acanthuridae is dominant in eastern Indonesia (Liki Islands), including Ctenochaetus striatus (41,00 ± 11,72 se) individuals/350m2, A. maculiceps (23,33 ± 13,61 se) indivi...
IOP Conference Series: Materials Science and Engineering, 2016
Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively usi... more Sedimentary aliphatic hydrocarbons content have been studied quantitatively and qualitatively using GC/MS method in eight coastal stations located in the Jakarta Bay, North of Jakarta, Indonesia. The total concentrations n-alkanes have ranged from 480 mu g.kg(-1) to 1,935 mu g.kg(-1) sediment dry weight. Several ratios (e.g. CPI24-32, NAR, TAR, Pr/Phy, n-C-17/Pr, n-C-18/Phyt, n-C-29/n-C-17, Sigma n-alkanes/n-C16LMW/HMW, Paq and TMD) were used to evaluate the possible sources of terrestrial-marine inputs of these hydrocarbons in the sediments. The various origins of aliphatic hydrocarbons were generally biogenic, including both terrigenous and marine, with an anthropogenic pyrolytic contribution (petrogenic and biogenic combustion). Two stations (G,H) were thehighest concentration and had potential risk to environment
IOP Conference Series: Materials Science and Engineering, 2016
Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseill... more Mediterranean mussel, Mytillusgalloprovincialis collected from the traditional market in Marseille, France,have been analysed using GC-QQQ/MS for their hydrocarbons (n-alkanes and polyaromatic hydrocarbons (PAHs)) extentwith two different solvent extraction, such as heptane:dichloromethane (HEP:DCM;1:1) and heptane:acetone (HEP:ACE; 1:1). The results showed hydrocarbons yielded from heptane:acetone extractionwere 28335 μg.kg- 1mussels dw (Ʃ n-alkanes C15-34) and 202 μg.kg-1mussels dw(ƩPAHs) while the yield from heptane:DCM extract was lower ca. 27026 μg.kg-1musselsdw and 133 μg.kg-1 mussels dw respectively from the Ʃn-alkanesC15-34and ƩPAHs. High hydrocarbon levels can be affected by the presence of lipids or other metabolites in mussels that have the same polarity with hydrocarbon compounds which has interferred the measurement. Several ratio parameter of n- alcanes and PAHs source in the mussels were evaluated to asses the origins of their hydrocarbons in mussels from which we suggested origins of hydrocarbons were pyrolytic and biogenic rather than petrogenic.
Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation ... more Laboratory microcosm experiments were performed to evaluate petroleum hydrocarbon biodegradation and phospholipid fatty acid (PLFA) composition in either non-contaminated (NC) or contaminated (C) sedimentary microcosms with a crude oil. An analytical procedure was developed to extract both hydrocarbons and PLFAs from the same culture. PLFAs were analyzed over time during an aerobic microcosm experiment (0–21 days) to obtain a better
Background and aims – The present study aims to describe a new species of pennate blue diatom fro... more Background and aims – The present study aims to describe a new species of pennate blue diatom from the genus Haslea, H. nusantara sp. nov., collected from Semak Daun Island, the Seribu Archipelago, in Indonesian marine waters. Methods – Assessment for species identification was conducted using light microscopy, Scanning Electron Microscopy and molecular techniques. The morphological characteristics of H. nusantara have been described, illustrated and compared to other morphologically similar blue Haslea taxa, distributed worldwide. Additionally, molecular characterization was achieved by sequencing plastidial and mitochondrial genomes. Key results – This new species, named Haslea nusantara, cannot be discriminated by its morphology (stria density) but it is characterized by its gene sequences (rbcL chloroplast gene and cox1 mitochondrial gene). Moreover, it differentiates from other blue Haslea species by the presence of a thin central bar, which has been previously reported in non-...
Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-m... more Green mussel (Perna viridis) can playing role as bio-indicator or biomonitoring agent for heavy-metalcontaminations in the sea. In this research, the concentrations of four elements Ni, Cu, Zn and Cd in P. viridis and in the serum of rat which orally feed by P. viridis were determined by Atomic Absorption Spectrometry (AAS) following dry acid digestion. Parameter analysis was evaluated by determining confidence limit for the obtained results. The result showed that there was a sequence of heavy-metal content in green mussels sample and laboratory rats serum, such as Ni < Cd…
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