A5082260732- Marine and coastal ecosystems
- Microbial Community Ecology and Physiology
- Marine Biology and Ecology Research
- Aquatic Ecosystems and Phytoplankton Dynamics
- Marine and fisheries research
- Marine and coastal plant biology
- Marine Toxins and Detection Methods
- Protist diversity and phylogeny
- Oceanographic and Atmospheric Processes
- Coral and Marine Ecosystems Studies
- Diatoms and Algae Research
- Isotope Analysis in Ecology
- Bacteriophages and microbial interactions
- Fish Biology and Ecology Studies
- Coastal wetland ecosystem dynamics
- Paleontology and Stratigraphy of Fossils
- Aquatic Ecosystems and Biodiversity
- Geological and Geophysical Studies
- Geochemistry and Elemental Analysis
- Methane Hydrates and Related Phenomena
- Aquaculture disease management and microbiota
- Geochemistry and Geochronology of Asian Mineral Deposits
- Aquatic Invertebrate Ecology and Behavior
- Cassava research and cyanide
- Marine Sponges and Natural Products
Institute of Marine Geology and Geophysics
2002-2025
Institute of Oceanography
2015-2025
Vietnam Academy of Science and Technology
2015-2025
Nha Trang University
2007-2016
Harmful algal blooms (HABs) in the southeastern Vietnamese coastal waters have caused large economic losses aquacultured and wild fisheries recent years; however, there been few oceanographic studies on these HAB events. The present study reports an extensive off during late June to July 2002 with situ observations analyzes conditions using satellite remote sensing data. had high chlorophyll a (Chl ) concentrations (up 4.5 mg m −3 occurring ∼200 km coast northeast of Mekong River mouth for...
The influence of the Mekong River (South China Sea) on N 2 fixation and phytoplankton distribution was investigated during lowest‐ highest‐discharge seasons (April 2007 September 2008, respectively). river plays an essential role in providing nutrients (nitrate, phosphate, silicate) for adjacent sea creates different salinity nutrient gradients over seasons. water (salinity 0), mesohaline waters 14–32), a transition zone with salinities between 32 33.5, marine above 33.5) were sampled at...
Viruses attract increasing interest from environmental microbiologists seeking to understand their function and role in coral health. However, little is known about main ecological traits within the holobiont. In this study, a quantitative qualitative characterization of viral bacterial communities was conducted on mucus seven different species Van Phong Bay (Vietnam). On average, concentrations viruses bacteria were, respectively, 17- twofold higher than surrounding water. The examination...
Viet Nam is challenged by extensive marine plastic pollution, however, remediation efforts are hampered undefined sources to the coastal environment. This study surveyed abundance, type, and source of beached litter at seven beaches along coast Nha Trang, Nam. A total 4754 items (>2 cm) yielded a mean abundance 19.8 ± 19.5 m-2 corresponding 116 226 g DW m-2. Our results demonstrate that related fishing aquaculture constituted least 62 % weight 38 number, showing these two sectors responsible...
ABSTRACT There is increasing suspicion that viral communities play a pivotal role in maintaining coral health, yet their main ecological traits still remain poorly characterized. In this study, we examined the seasonal distribution and reproduction pathways of viruses inhabiting mucus scleractinians Fungia repanda Acropora formosa collected Nha Trang Bay (Vietnam) during an 11-month survey. The strong coupling between epibiotic bacterial abundance suggested phages are dominant among...
Red tides and associated fisheries damage caused by the harmful raphidophyte Chattonella were reassessed based on documented local records for 50 years to understand distribution economic impacts of species in Western Pacific. Blooms with have been recorded East Asia since 1969, whereas they only Southeast 1980s. Occurrences from six Asian countries, Indonesia, Malaysia, Philippines, Singapore, Thailand Viet Nam, mass mortalities mainly farmed shrimp 1980–1990s, fish 2000–2010s. These...
In the South China Sea, southwest monsoon between June and September induces upwelling off southern central Vietnamese coast. During field campaigns in July 2003 2004 we evaluated importance of nitrate nitrogen fixation as sources new for phytoplankton primary productivity, both actual zone oligotrophic area farther offshore. Complementary to rate measurements uptake, fixation, determined vertical fluxes by Ekman (upwelling zone) turbulent diffusion (offshore waters). Because influence El...
Investigating microplankton biomass and diversity under different climatological conditions is key to the understanding of cascading effects climate change on nutrient cycles biological productivity. Here we have used data collected during two contrasting summers along coast Viet Nam show how climatological-driven changes can a significant influence distribution communities their via its impact concentrations in water column. The first summer July 2003 followed weak El-Nino Southern...
Five species of Alexandrium (A. affine, A. fraterculus, leei, pseudogonyaulax, and tamiyavanichii) are commonly found in Vietnamese waters. They were distinguished based on their apical pore complex (A.P.C), precingular first plate (1'), ventral (Vp), sulcal platelets. A genetic analysis was conducted using nuclear rDNA sequences ITS LSU (D1-D3, D8-D10). The growth rates tamiyavanichii, pseudogonyaulax quite similar. Specifically, these four had the highest at two temperature levels 24 °C 27...
Abstract The fossil dinoflagellates Spiniferites bentorii , S. mirabilis and membranaceus are known to inhabit recent sediments often used reconstruct past sea‐surface conditions. However, information on their corresponding motile cells has been rare. We isolated single cysts resembling these species from China France yield Gonyaulax spinifera ‐like cells. strains were also established Viet Nam South Korea by isolating Both examined light scanning electron microscopy, LSU rRNA genes...
Phytoplankton communities can change rapidly in response to shifting environmental conditions. A dataset of phytoplankton and factors Cam Ranh Bay was analyzed assess the temporal shifts over both short-term (days, weeks) long-term (seasons) periods. In this Bay, changes compositions were insignificant found short-term, while there no clear pattern abundance biomass variation. Seasonally, significant dominant also observed, with dinoflagellates diatoms predominating dry wet seasons,...
Mallomonas distinguenda sp. nov. and skvortsovii are described from Dak Lua swamp, located in Cat Tien National Park (Dong Nai Province, Southeastern Viet Nam). The description is based on silica-scale morphology studied by means of transmission scanning electron microscopy. These species belong to the section Papillosae scale morphology. most characteristic feature for both taxa shield reticulation. In case distinguenda, it an external By contrast, has internal
Abstract The mean trophic position (TP) of mesozooplankton largely determines how much mass and energy is available for higher levels like fish. Unfortunately, the ratio herbivores to carnivores in difficult identify field samples. Here, we investigated changes TP a highly dynamic environment encompassing four distinct habitats southern South China Sea: Mekong River plume, coastal upwelling region, shelf waters, offshore oceanic waters. We used set variables derived from bulk amino acid...
Viet Nam has a coastline of 3200 km with thousands islands providing diverse habitats for benthic harmful algal species including Gambierdiscus. Some these produce ciguatera toxins, which may accumulate in large carnivore fish potentially posing major threats to public health. This study reports five Gambierdiscus from Vietnamese waters, notably G. australes, caribaeus, carpenteri, pacificus, and vietnamensis sp. nov. All are identified morphologically by LM SEM, identifications supported...
Identification of species the dinoflagellate genus Ostreopsis is difficult because several have been poorly described, others misidentified in literature, and type species, O. siamensis, has not described by contemporary taxonomic methods. In present study, it argued that sp. 6 as previous authors similar to we offer an emended description siamensis LM, SEM, molecular analyses nuclear LSU ITS rDNA based on material collected a few hundred kilometers from locality Gulf Thailand along...
The structure of the phytoplankton community in surface waters is consequence complex interactions between physical and chemical properties upper water column as well interaction within general biological community. Understanding communities especially challenging highly variable dynamic marine environments. A variety strategies have been employed to delineate planktonic habitats, including both biogeochemical mass based approaches. These methods led fundamental improvements our...