Showing papers by "Neviaty P. Zamani published in 2016"
TL;DR: It is suggested that microplastics constitute a new seston component that exerts a stress comparable to natural suspended solids similar to that experienced by marine bivalves during prolonged periods of valve closure.
136 citations
TL;DR: Muscles and viscera of themilkfish exhibited the highest degree of end uptake and end depuration of 137Cs from seawater and feeding, and depuration occurred quickly for radiolabeled food uptake, reaching 20% of retention within 10 days after exposure.
18 citations
TL;DR: Stress-specific and population-specific differences in mussel resistance to adverse conditions are found: Individuals from the impacted Jakarta Bay performed better under hypoxia than their conspecifics from the natural sites, whereas the latter were more resistant to hyposalinity.
13 citations
TL;DR: It is explained why phenotypic plasticity and high BCIs are more likely the causes of population-specific differences in hypoxia tolerance in P. viridis than stress-induced selection for robust genotypes.
Abstract: The Asian green mussel Perna viridis is tolerant to environmental stress, but its robustness varies between populations from habitats that differ in quality. So far, it is unclear whether local adaptations through stress-induced selection or phenotypic plasticity are responsible for these inter-population differences. We tested for the relevance of both mechanisms by comparing survival under hypoxia in mussels that were transplanted from an anthropogenically impacted (Jakarta Bay, Indonesia) to a natural habitat (Lada Bay, Indonesia) and vice versa. Mussels were retrieved 8 weeks after transplantation and exposed to hypoxia in the laboratory. Additional hypoxia tests were conducted with juvenile mussels collected directly from both sites. To elucidate possible relationships between habitat quality and mussel tolerance, we monitored concentrations of inorganic nutrients, temperature, dissolved oxygen, salinity, phytoplankton density and the mussels’ body condition index (BCI) for 20 months before, during and after the experiments. Survival under hypoxia depended mainly on the quality of the habitat where the mussels lived before the hypoxia tests and only to a small degree on their site of origin. Furthermore, stress tolerance was only higher in Jakarta than in Lada Bay mussels when the BCIs were substantially higher, which in turn correlated with the phytoplankton densities. We explain why phenotypic plasticity and high BCIs are more likely the causes of population-specific differences in hypoxia tolerance in P. viridis than stress-induced selection for robust genotypes. This is relevant to understanding the role of P. viridis as mariculture organism in eutrophic ecosystems and invasive species in the (sub)tropical world.
10 citations
19 Apr 2016
TL;DR: Levels of cytotoxicity were strongly correlated with Sarcophyton sp.
Abstract: This study presents the relationship between benthic cover of Sarcophyton sp. living on coral reefs and their cytotoxicity (an assumption of soft coral allelochemical levels) along acidification gradients caused by shallow water volcanic vent systems. Stations with moderate acidification (pH 7.87 ± 0.04), low acidification (pH 8.01 ± 0.04), and reference conditions (pH 8.2 ± 0.02) were selected near an Indonesian CO 2 seep (Minahasa, Gunung Api Island, and Mahengetang Island). Cover of the dominant soft coral species ( Sarcophyton sp.) was assessed and tissue samples were collected at each site. The cytotoxicity tissue extracts were analyzed using the 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolinon bromide (MTT) method. Levels of cytotoxicity were strongly correlated with Sarcophyton sp. cover ( p 2 = 0.60 at 30 ppm and 0.56 at 100 ppm), being highest at mean pH 8.01 where the soft corals were most abundant. This finding suggests that Sarcophyton sp. can be expected to survive ocean acidification near Indonesia in the coming decades. How the species might be adversely affected by further ocean acidification later in the century unless CO 2 emissions are reduced remains a concern.
9 citations
TL;DR: In this paper, the growth rate of corals P. lutea at the north station (windward) was in a range of 0.6-2.3 cm and its average growth rate was 1.20 cm/year.
Abstract: Reefs are benthic biotas that have an important role in marine ecosystems, where its growth is strongly influenced by environmental conditions. A massive coral has capacity to records environmental condition. This can be traced through the process of deposit calcium carbonate (CaCO 3 ). Deposited coral skeletons of species Porites lutea are able to provide information in determining the rate of corals growth that is seen in its annual band. Sampling technic of corals was carried out by using pneumatic drill and then the coral samples were analyzed using X-rays to gain its directions, ages and growth rates. The research results showed that growth rate of corals P. lutea at the north station (windward) was in a range of 0.6-2.3 cm/year and its average growth rate was 1.20 cm/year. The coral growth at southern station (leeward) was in range of 0.5-1.9 cm/year and its average growth rate was 1.11 cm/year. There is not significant correlation at windward (R 2 = 0.1922) and leeward (R 2 = 0.201) between P. lutea growth rate with sea surface temperature. However, there is a decreasing trend of coral growth from 1982 to 2014. There are three lowest peak were observed during El Nino event in 1983, 1993, 1998 with the growth rate respectively are 0.9 cm/year, 0.7 cm/year, and 0.5 cm/year.
9 citations
13 Dec 2016
TL;DR: This study links radionuclide bioaccumulation data and monitoring data obtained in the field and laboratory experiment with radiation dose determined by ERICA Tools, an approach that will enable better linkages to be made between exposure and dose in Chanos chanos and its marine food web.
Abstract: The present trend of global warming has led to an increase in seawater temperature and salinity. The effects of increasing salinity and temperature on the accumulation of 137 Cs by milkfish Chanos chanos was studied under laboratory conditions to obtain information on Chanos chanos adaptability under environmental changes. The uptake of radioactive cesium by Chanos chanos increased with temperature of seawater. The concentration factors (CF) of 137 Cs for temperatures of 25°C, 27°C, 29°C, and 31°C at steady state period were 5.25, 5.91, 6.78, and 9.98 mL g -1 for the whole-body of Chanos chanos . The concentration factors at steady state (CF ss ) of 137 Cs for salinities of 26‰, 29‰, 32‰, and 35‰ were 6.23, 9.93, 9.24, and 6.86 mL g -1 , respectively. After temperature exposure to 31°C, the fish gills showed hyperplasia of epithelial cells in branchial secondary lamellae, congestion of blood vessels, and hypertrophy of pillar cells. The fish from the treatment group exhibited hemorrhage between the branchial secondary lamellae and an abundance of mucous substance in comparison with control group. This study links radionuclide bioaccumulation data and monitoring data obtained in the field and laboratory experiment with radiation dose determined by ERICA Tools, an approach that will enable better linkages to be made between exposure and dose in Chanos chanos and its marine food web. Received: 2 November 2015; Revised: 1 July 2016; Accepted: 17 July 2016
5 citations
31 May 2016
TL;DR: In this paper, the decomposition rate of leaf litter in the Mangrove Ecosystem of Kelong Island, Bintan Regency, Malaysia, was investigated using a net bag containing 10 g of wet leaves placed on the substrate surface.
Abstract: Decomposition Rate of Leaf Litter in The Mangrove Ecosystem of Kelong Island, Bintan Regency. The mangrove forests in the southeastern part of Kelong Island have abundant carbon reserves that indicate high primary productivity areas. Decomposition of leaf litter, as a part of regional productivity, produces simple essential nutrients utilized to sustain the growth of mangroves. The purpose of this study was to determine the decomposition rate of leaf litter in each zone of the study, the Landward (L), Middlezone (M), and Seaward (S) which is distinguished by the abundance of plant species and in situ environmental parameters. The experiment was conducted in March–May 2015 in the mangrove areas of Island Kelong, Bintan regency. The decomposition process was observed at six time intervals, i.e. 2, 4, 7, 14, 28, and 42 days using net bag containing 10 g of wet leaves placed on the substrate surface. The results showed that L was a zone with highest percentage of decomposition (56.34 ± 20.58%) compared to the M and S, respectively for 51.59 ± 15.46% and 51.09 ± 8.70%. The highest rate of litter decomposition in zone L was 1.40 ± 0.82 g·m-2·day-1 that was significantly different from the zones M and S, respectively of 0.83 ± 0.89 g·m-2·day-1 and 0.78 ± 0.70 g·m-2·day-1. Analysis of the coefficient of decomposition rate (k) indicated that the rate of decomposition in this region was high (k > 0.01). The decomposition rate has a significant correlation with the abundance of mangrove species, the salinity value of the water, and soil temperature.
5 citations
TL;DR: In this article, a model regresi linier digunakan untuk memprediksi penggunaan spektrofotometer pada Densitas Optik (Optical Density,  OD) dengan panjang  Â-gelombang à  (i¬) à (i.i.d.
Abstract: Kemudahan  penggunaan  mikroskop  untuk  pengamatan  kepadatan  sel mikroalga  tetap memiliki  keterbatasan  sehingga  perlu  dicari  suatu  metode alternatif  yang  mampu meminimalisir keterbatasan tersebut. Model regresi linier digunakan untuk memprediksi peluang penggunaan spektrofotometer pada Densitas Optik (Optical Density,  OD) dengan panjang  gelombang  (i¬)  550 nm, 650 nm, dan  750  nm  sebagai  alternatif  pengganti mikroskop  saat  pengamatan kepadatan  sel  mikroalga.  Hasilnya  menunjukkan  bahwa walaupun  seluruh panjang  gelombang  dapat  secara  representatif  menggambarkan kepadatan sel mikroalga, namun OD 650 nm menunjukkan hasil terbaik. KATA KUNCI: Densitas optik, kepadatan sel, mikroalga laut, regresi linier.
4 citations
TL;DR: In this paper, the authors presented the application of Logic Structure Determination (LSD) as a freeware Computer Assisted Structure Elucidation (CASE) for automatic molecular structure determination of cembranoid compounds from soft corals species.
Abstract: Indonesian tropical soft corals are valuable resources that produce pharmacological cytotoxic cembranoids. However, the manual structure determination in these compounds requires adequate knowledge of organic chemistry. This study presents the application of Logic Structure Determination (LSD) as a freeware Computer Assisted Structure Elucidation (CASE) for automatic molecular structure determination of cembranoid compounds from soft corals species. 12 Nuclear Magnetic Resonance (NMR) datasets of cytotoxic cembranoids were used to evaluate the accuracy of LSD in generating the possible structures. The results of this study shows that LSD generated numerous possible molecular structures as the data input files were only derived from 2D-NMR HMQC (Heteronuclear Multiple-Quantum Correlation), COSY (Homonuclear Correlation Spectroscopy), and HMBC (Heteronuclear Multiple Bond Correlation). The accuracy was significantly enhanced (only 2-4 possible cembranoid structures from each NMR dataset) with the addition of H2BC (Heteronuclear 2 Bond Correlation) experimental data. This may indicate that VLRC (Very Long-Range Correlations) significantly affects LSD capability. Furthermore, LSD with direct 2 bond NMR experimental data is a reliable CASE technique for cembranoid compounds identification. In general, this freeware-CASE has the potential to be applied on other types of small molecule compounds and may serves as a solution for elucidation bottleneck step in studies on Indonesian natural products.
3 citations
Journal Article•
TL;DR: Connectivity pattern of Sumatran leatherback turtles showed that migration path of this populations reaching to Indian Ocean and South China Sea, and two of four haplotypes are new haplotypes that only found in Sumatra.
Abstract: Sumatra is part of Indian Ocean population of leatherback turtles. Data of leatherback turtles from Sumatra is unavailable. This study aims to determine the genetic diversity and analyze connectivity pattern of Sumatran leatherback turtle populations based on haplotype variation of control region mtDNA. We used 14 samples from 2 locations in Sumatra (Lohknga and Panga). Haplotypes have been determined by DNA sequencing. Four haplotypes were found from Sumatra. Interestingly, two of four haplotypes are new haplotypes that only found in Sumatra. Sumatra population that has high genetic diversity is Lhoknga, h=0.6 and π=0.0078 followed by Panga h=0.5 and π=0.0026. Connectivity pattern of Sumatran leatherback turtles showed that migration path of this populations reaching to Indian Ocean and South China Sea. South China Sea is important location as interaction place for leatherback turtles from Sumatra and Papua, Indonesia. Sumatran Leatherback turtle is important population of leatherback turtle. It needs good management to protect these populations. Sumatran Leatherback turtles need further studies to obtain the annual population data.
TL;DR: The result showed that both of these coral cannot differentiate based on morphometric measurement, but it can differentiate significantly based on descriptive characters, so both ofThese coral are not synonym.
Abstract: Acanthophyllia deshayesiana has a different habitat with Cynarina lacrymalis in the nature, but they have same character on living forms, diameter, and height of corallite. Both of these species are considered synonym, thus it needs verification study to describe whether it is synonym species or not based on morphological data. Eleven descriptive characters and seven morphometric characters were used to verify the synonym species of these coral. Descriptive data were performed by scoring method, while morphometric data were obtained from morphometric. Morphometric data were analyzed by Correspondence Analysis of Principal Coordinates (CAP) and Agglomerative Hierarchical Cluster (AHC), while descriptive data were analyzed by UPGMA (Unweight Pair Group Method with Arithmetic Mean). The result showed that both of these coral cannot differentiate based on morphometric measurement. It can differentiate significantly based on descriptive characters, so both of these coral are not synonym. Keywords: synonym, morphometric, descriptive, Cynarina lacrymalis, Acanthophyllia deshayesiana
17 May 2016
TL;DR: Kukupang merupakan salah satu ibu kota Kecamatan Kepulauan Jouronga ying berada pada Kabupaten Halmahera Selatan Maluku Utara Tujuan penelitian untuk mengetahui struktur komunitas ekosistem mangrove and menganalisis tingkat kerapatan ekosistsistem mengrove Metode transek kuadrat and penentuan stasiun dilakukan dengan met
Abstract: Hutan mangrove telah menyesuaikan diri dari terpaan ombak yang kuat dengan salinitas yang tinggi Tumbuhan mangrove tumbuh diatas dataran lumpur digenangi air laut atau air payau sewaktu air pasang atau digenangi air sepanjang hari, Desa Kukupang memiliki ekosistem mangrove yang tumbuh di sepanjang pesisr pantai, namun kelestariannya terancam akibat oleh warga desa tersebut Desa Kukupang merupakan salah satu ibu kota Kecamatan Kepulauan Jouronga yang berada pada Kabupaten Halmahera Selatan Provinsi Maluku Utara Ekosistem mangrove Desa Kukupang memiliki tumbuh hidup disepanjang pesisir pantai dengan kondisi pertumbuhan masih sangat alami Penelitian ini dilaksanakan pada bulan Oktober-November 2014 Lokasi penelitian bertempat di kawasan ekosistem mangrove Desa Kukupang Kecamatan Kepulauan Joronga, Kabupaten Halmahera Selatan Maluku Utara Tujuan penelitian untuk mengetahui struktur komunitas ekosistem mangrove dan menganalisis tingkat kerapatan ekosistem mangrove Metode transek kuadrat dan penentuan stasiun dilakukan dengan metode acak terstratifikasi Pengambilan data terbagi dalam 3 stasiun yang berukuran 10 x 10 m untuk pohon, 5 m x 5 m untuk pancang, 1 x 1 m untuk semai, , dimana penetuan stasiun untuk sampling dibagi menjadi 3 stasiun Berdasarkan hasil penelitian terdapat 6 jenis mangrove ditemukan yaitu: Rhizopora apiculata, Avicennia marina, Rhizopora mucronata, Sonneratia alba, Brugueraea gymnorrhiza, Ceriops tagal Pola sebaran ekosistem mangrove berasosiasi, tingkat kerapatan tertinggi diperoleh jenis mangrove Rhizopora apiculata sebesar 0,23 (ind/m 2 ) kondisi substrat pada loksi penelitian yang dominan pasir