Dung Le Quang

Dung Le Quang
Vietnam National University, Ho Chi Minh City · Institute for Circular Economy Development

Ph.D

About

39
Publications
12,992
Reads
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793
Citations
Additional affiliations
May 2015 - July 2020
Universiti Malaysia Terengganu
Position
  • Professor (Associate)
January 2010 - present
Institute of Marine Environment and Resources, Haiphong, Vietnam
Position
  • Researcher
Education
October 2007 - March 2011
The University of Tokyo
Field of study
  • Aquatic Bioscience

Publications

Publications (39)
Article
Marine heatwaves (MHWs) have occurred with increasing duration, frequency and intensity in the past decade in the South China Sea, posing serious threats to marine ecosystems and fisheries. However, the impact of MHWs on marine bivalves – one of the most ecologically and economically important fauna in coastal ecosystems – remains largely unknown....
Article
The surface distribution of lipid biomarkers, elemental and isotopic compositions (δ13C and δ15N, C/N) were investigated from coastal sediments of Brunei Bay, in order to understand the sources and biogeochemical processes of the organic matter. Fatty acid biomarkers from terrestrial higher plants (e.g., long-chain fatty acids>20), phytoplankton (e...
Article
Full-text available
Temporal and spatial water quality data are essential to evaluate human health risks. Understanding the interlinking variations between water quality and socio-economic development is the key for integrated pollution management. In this study, we applied several multivariate approaches, including trend analysis, cluster analysis, and principal comp...
Article
Seasonal variations in total mercury concentrations [Hg] and trophic transfer through the food web were assessed using stable isotopic tracers for the Setiu Wetlands, Terengganu. The [Hg] measured in surface sediments and biota varied inversely between wet and dry seasons. Increased rainfall and water disturbance during the wet season are suggested...
Article
Full-text available
This paper presents the results of mercury analysis on 786 abiotic (surface sediments) and biotic (plant and animal tissues) samples collected from 10 sites at Matang Mangrove Forest Reserve in Peninsular Malaysia. Sediment samples were collected at the surface level from both river bank and forest understory. Whereas plant tissues obtained from Rh...
Article
Charcoal production activities at the Matang Mangrove Forest Reserve (MMFR) in Peninsular Malaysia have a potential to emit volatile compounds such as Hg back into the ambient environment, raising concerns on the public health and safety. The present study was aimed at analyzing Hg concentration from different plant/animal tissues and sediment samp...
Article
Full-text available
Stable isotope analyses of muscle tissue (δ13Cmuscle and δ15Nmuscle) and otoliths (δ13Cotolith and δ18Ootolith) were used to retrospectively track habitat uses of Lethrinus lentjan, and to determine any association between Setiu Lagoon (nursery habitat) and coastal artificial reefs (CARs; adult habitats) on the Terengganu coast, Malaysia. Muscle st...
Article
Full-text available
Pulau Redang and Pulau Tioman have experienced huge tourism growth over the last two decades, but minimal sewage treatment may threaten the resilience of their coral reefs. This study uses stable isotope techniques to identify suitable bioindicators of sewage nutrients (δ 15 N) at these islands by measuring macroalgae (Lobophora spp.), gastropods (...
Article
Full-text available
The aim of this study was to determine the distribution of nitrogen (N)-and phosphorus (P)-based nutrients in the Besut River basin, Malaysia (South China Sea). The mean concentrations of ammonia, nitrate, total dissolved N and total particulate N were 43 µg/L N, 195 µg/L N, 485 µg/L N, 431 µg/L N, respectively. In contrast to N, lower mean concent...
Article
We conducted stable isotope (δ13C and δ15N) and gut content analyses to understand habitat use of juvenile reef fishes ( Lethrinus lentjan, Lutjanus russellii and Epinephelus coioides ), particularly the influence of spatial habitat structure along seagrass–mangrove continua. Sampling was conducted in Setiu Lagoon, located in the southern waters of...
Article
Full-text available
The present study, aimed at observing the total concentration of mercury (Hg) in edible finfish species with an implication to human health risk, was carried out from the Setiu mangrove wetlands on the east coast of Peninsular Malaysia. Out of 20 species observed, the highest Hg concentrations were found among carnivores-fish/invertebrate-feeders,...
Article
The commercially important pink ear emperor fish, Lethrinus lentjan, often occurs as a juvenile in subtropical and tropical interlinked mangrove and seagrass ecosystems, but little is known about its feeding habits and habitat use. Here, we used gut contents and stable isotopic (δ¹³C and δ¹⁵N) ratios to determine temporal changes in food sources an...
Article
The combined analyses of total mercury (Hg) and stable isotopic (δ¹³C and δ¹⁵N) ratios were conducted to describe the food web pathways of dietary Hg, from basal food sources to benthic invertebrates and higher trophic level fish, and to determine if biomagnification of Hg is a persistent process in the food web in a mangrove creek in Setiu Lagoon....
Article
Applying stable isotopes to explore insight into the food web structure in marine ecology have been increasing recently. Tropical mangrove forest, one of the vital marine habitats, has been received intensive attentions in the field. However, there is still controversy about the important roles of primary carbon sources provide to consumers in the...
Article
Plastic resin pellets collected at Minh Chau island and Ba Lat estuary between 2007 and 2014 in Vietnam were analyzed for dichloro-diphenyl-trichloroethanes (DDTs), polychlorinated biphenyls (PCBs) and hexachlorocyclohexanes (HCHs). The study was carried out as part of the International Pellet Watch program for monitoring the global distribution of...
Article
Ricefishes of the genus Oryzias, including Japanese medaka (O. latipes), are known as excellent model organisms for studies in various fields of science. Some species of the genus inhabit brackish water, and such species are recognized to be useful to investigate physiological phenomena in seawater. However, only a limited number of species have be...
Article
Heavy metal concentrations in muscle and their relation to thegrowth of two marine fish species, including tonguefish (Cynoglossus arel) and mullet (Mugil cephalus), were studied. The samples were collected in Bach Dang estuary andconcentrations of heavy metals (As, Cd, Co, Mn, Cu, Zn, Pb, and V) in muscle of the fisheswere determined. The result s...
Article
The partial toxicity tests of copper (Cu²⁺), zinc (Zn²⁺) and cyanide (CN⁻) for young cobia fishes with (Rachycentron canadum) 45 day-old were conducted in the Doson station during ten days (yr 2005). These three toxic substances affected strongly the growth of the cobia fish (size and weight), even at the lowest treated concentration. The LC50 valu...
Article
Full-text available
Evaluating the economic valuation of ecosystem services in general and marine ecosystem service in particular in Vietnam has little attention in studying, even though there is highly urgent demand of this work dealing with problems in natural resources management, protection, territory planning, sustainable development as well as education in Vietn...
Article
In order to understand the present status of heavy metal contamination in Haiphong coast, rocky oyster (Saccostrea glomerata) and hard clam (Meretrix lyrata) were examined. The concentration of nine elements (As, Cd, Mn, Cr, Co, Cu, Pb, V and Zn) was determined in whole tissues of these species from Phu Long, Do Son and Quan Muc in March 2012. The...
Article
Full-text available
Three basic approaches in resources valuation have been applied worldwide as well as initially used in Vietnam generally and in marine ecosystems particularly, including Impact Analysis Valuation, Partial Valuation and Total Economic Valuation. However, studying results in Vietnam are still limited and not taken into account all ecosystem values. R...
Article
Historical trends of the accumulation of polybrominated diphenyl ethers (PBDEs) and polychlorinated biphenyls (PCBs) in a typical tropical Asian environment were investigated using radio-dated sediment cores from Manila Bay, the Philippines and from the upper Gulf of Thailand. Vertical profiles indicated earlier usage of PCBs than of PBDEs which co...
Article
Full-text available
Southeast Asia is known as a center of biodiversity of the earth. As economic growth of this region is remarkable, conservation of biodiversity is a top priority issue. For this purpose, it is important to monitor the environmental condition in effective ways. We are trying to detect pollutants in coastal and estuary waters through the expression l...
Article
Full-text available
The patterns of use of marine and freshwater habitats by the tropical anguillid eels Anguilla marmorata and A. bicolor pacifica were examined by analysing the otolith strontium (Sr) and calcium (Ca) concentrations of yellow (immature) and silver (mature) stage eels collected in Vietnamese waters. In A. marmorata, the change in the Sr:Ca ratios outs...
Article
Full-text available
The patterns of use of marine and freshwater habitats by the tropical anguillid eels Anguilla marmorata and A. bicolor pacifica were examined by analysing the otolith strontium (Sr) and calcium (Ca) concentrations of yellow (immature) and silver (mature) stage eels collected in Vietnamese waters. In A. marmorata, the change in the Sr:Ca ratios outs...
Article
Full-text available
Southeast Asia is known as a center of biodiversity of the earth. As economic growth of this region is remarkable, conservation of biodiversity is a top priority issue. For this purpose, it is important to monitor the environmental condition in effective ways. We are trying to detect pollutants in coastal and estuary waters through the expression l...
Article
In order to examine whether metal accumulation patterns are related to the maturity stages of tropical anguillid eels, two eel species, Anguilla marmorata and A. bicolor pacifica for both yellow (immature) and silver (mature) stages, were collected in the Ba River in Vietnam. The levels of nine trace metals in liver and muscle tissues were determin...
Article
In order to understand the ecological risks caused by organotin compounds (OTs) in diadromous fish migrating between sea and freshwater, tributyltin (TBT) and triphenyltin (TPT) compounds, and their breakdown products, were determined in the catadromous eels Anguilla marmorata and A. bicolor pacifica, collected in Vietnam waters. Ontogenic changes...
Article
In order to understand the metal concentrations in Japanese eel Anguilla japonica, nine elements were analyzed in the livers of different migratory types of eels collected from Tokushima region (south Japan). Migratory types were defined by examining the Sr:Ca ratio in otoliths. The results showed that there were significant differences in V, Cr, C...
Article
Full-text available
This study investigated trace metals in water, sediment, and various organs of the mature eel Anguilla marmorata in the Ba River, Vietnam. The metal concentrations in water and sediment did not exceed the Vietnam water criteria and sediment background concentration, except for Mn and Pb in sediment. The results of metal analysis in eel specimens in...
Article
Full-text available
In order to understand the present status of heavy metal contamination and the risk associated with human consumption, commercial freshwater eels in Vietnam were examined. The concentration of eight elements (Cr, Mn, Co, Cu, Zn, Sr, Cd, and Pb) was determined in muscle tissue of tropical eel Anguilla marmorata collected in four provinces, Quang Tri...
Article
Samples of polyethylene pellets were collected at 30 beaches from 17 countries and analyzed for organochlorine compounds. PCB concentrations in the pellets were highest on US coasts, followed by western Europe and Japan, and were lower in tropical Asia, southern Africa and Australia. This spatial pattern reflected regional differences in the usage...
Article
Full-text available
The partial toxicity tests of copper (Cu2+), zinc (Zn2+) and cyanide (CN-) for young cobia (Rachycentron canadum) fishes 45 days-old were conducted in Doson station during ten days (yr 2005). These three toxic substances affected strongly the growth rate of the Cobia fish (length and weight of the body), even at the lowest treated concentration. Th...

Questions

Questions (3)
Question
I am preparing to do photosynthesis' experiment of seaweed Sargassum sp. to estimate carbon fixation and nutrient absorption from light and dark bottles' method at different periods (1 and 2h) in the field. Due to my lab having no instruments to measure C directly from experiment I' d like to use DO concentrations converting to C concentrations. Based on the experiment, I'd like to estimate carbon fixation of seaweed from dissolved oxygen (DO) concentration that I got from experiment' measurement between light and dark bottles. I also tried to estimate how much NO3, NH4 and PO4 can be absorbed by seaweed from experiment at different phase (light and dark).  However, I've not found any related studies yet. So, if anyone know publications related to such experiment, please kindly let me know or any experienced experiment sharing is welcome. Thank you so much.        
Question
A number of studies showed that rock oysters can accumulate higher levels of Cd in tissues, much higher than that in other mussel species collected at the same sites. Despite these higher levels of Cd however, they survive. So, why can rock oysters retain higher levels of Cd in their body and what biological mechanisms can explain that? Thank you.

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Projects

Projects (2)
Project
Coral reefs in islands from Terengganu coast have been reported the impact of anthropogenic activities recently. The earlier researches, however, focused on the assessment of water quality, deforestation, sedimentation in the coral reefs in Bidong, Redang islands. There is no available information of metal contaminations as well as environmental condition records in the corals from the region, while corals have been recently recognized as good proxies for marine pollution and environmental conditions. Therefore, we conduct the study to understand the anthropogenic effects and natural environmental conditions in coral reefs from Terengganu region. The study will be carried out by UMT in collaboration with University of Tokyo. Coral cores of Porites spp. and Agaricia spp. will be collected in the coral reefs of Pulau Bidong and Redang along a gradient of distance from the land, to evaluate the influence of contaminant run off from near shore to the offshore areas. Trace elements are analysed at UMT while high resolution LA-ICPMS analysis and Oxygen stable isotope using stable isotope ratio mass spectrometer in coral cores will be carried out at University of Tokyo. Analysis of metal ratios may provide a record of metal pollution andsources while past sea surface temperature is gained from Sr/Ca and stable oxygen isotope. The results of this study will be compared with data at ERA-Interim that has good SST records since 1979 and this comparison will provide information on the sensitivity of corals in recording SST. The results may contribute towards better understanding of the SST of the South China Sea
Project
The tropical food web in mangrove and seagrass systems are complexity, which stimulates studies to explore more insight into the relationships and interactions of creatures in the systems. Recent findings of food web based on stable isotope analysis indicated that the mangrove litter is not only the primary sources but also benthic microalgae and detritus and other sources may contribute more important carbon sources to the mangroves. However, these sources vary depend on many factors both natural condition and anthropologic disturbances. The Setiu Wetland is shallow mangrove lagoon system with covering of mangrove, seagrass, estuary, etc. The wetland provides important fish resources to local people and is home to indigenous species of flora and fauna. While food web structure and stability of food chain are factors to determine the health of an ecosystem, but the understanding of such information in Setiu wetland is scarce. Furthermore, human activities have influenced the linkage in the systems, because the wetland is fragile ecosystems susceptible to anthropogenic effects. For examples, heavy metals, cadmium, mercury, zinc, etc., have been found high levels at some areas in Setiu wetland recently, which may alter the basal food web structure in the systems. Therefore, works to assess the impact of metal contamination transfer through food web in mangrove and seagrass are is critically important in efficiently conserving wildlife services for sustainable use as well as managing the impacts of anthropogenic and natural changes to ecosystems. Stable isotopic techniques (13C and 15N) will be approached to elucidate food web structure and to determine primary sources to support for the wetland. Heavy metals will be identified in trophic food webs and predator-prey relationships. The main goal of this project is to understand the food web structure and impacts of heavy metals to the food chain in Setiu wetland.