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Go to AGRIS search. Status of bivalve exploitation and farming in the coastal waters of south Vietnam. ...
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Climate change impacts ocean nutrient availability and will likely alter the marine food web. While climate models predict decreased average ocean productivity, the extent of these changes, especially in the marginal seas upon which large... more
Climate change impacts ocean nutrient availability and will likely alter the marine food web. While climate models predict decreased average ocean productivity, the extent of these changes, especially in the marginal seas upon which large human populations depend, is not well understood. Here, we reconstructed changes in seawater phosphate concentration and nitrate source over the past 400 years, which reveals a more than 50% decline in residence time of seawater phosphate, and 8%–48% decline in subsurface nitrogen supply following the coldest period of Little Ice Age. Our data indicates a link between surface ocean nutrient supply and the East Asian Summer Monsoon strength in an economically important marginal sea. As climate models predict that the East Asian Summer monsoon will strengthen in the future, our study implies that surface ocean primary productivity may increase in the South China Sea, contrary to the predicted decrease in global average ocean productivity.
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Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in Vlaanderen.
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Go to AGRIS search. Status of bivalve exploitation and farming in the coastal waters of south Vietnam. ...
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Vlaams Instituut voor de Zee. VLIZ. Informatie over marien en kustgebonden onderzoek & beleid in Vlaanderen.
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Research Interests: Business, Earth Sciences, Decision Making, Design Management, Political Science, and 13 moreChina, Environmental Planning, Environmental Sciences, Environmental Resource Management, South China Sea, Information Exchange, Fishery Management, Integrated Coastal and Ocean Management, Environmental degradation, United Nations Environment Programme, Regional Cooperation, Production Services, and area of concern
Coral reefs in the Central Indo-Pacific region comprise some of the most diverse and yet threatened marine habitats. While reef monitoring has grown throughout the region in recent years, studies of coral reef benthic cover remain limited... more
Coral reefs in the Central Indo-Pacific region comprise some of the most diverse and yet threatened marine habitats. While reef monitoring has grown throughout the region in recent years, studies of coral reef benthic cover remain limited in spatial and temporal scales. Here, we analysed 24,365 reef surveys performed over 37 years at 1972 sites throughout East Asia by the Global Coral Reef Monitoring Network using Bayesian approaches. Our results show that overall coral cover at surveyed reefs has not declined as suggested in previous studies and compared to reef regions like the Caribbean. Concurrently, macroalgal cover has not increased, with no indications of phase shifts from coral to macroalgal dominance on reefs. Yet, models incorporating socio-economic and environmental variables reveal negative associations of coral cover with coastal urbanisation and sea surface temperature. The diversity of reef assemblages may have mitigated cover declines thus far, but climate change cou...
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Using various chromatographic separations, eight sesquiterpenoids (1-8), including one new compound 3β,5α-dihydroxyeudesma-4(15),11-diene (1), were isolated from the MeOH extract of the Vietnamese soft coral Sinularia erecta. The... more
Using various chromatographic separations, eight sesquiterpenoids (1-8), including one new compound 3β,5α-dihydroxyeudesma-4(15),11-diene (1), were isolated from the MeOH extract of the Vietnamese soft coral Sinularia erecta. The structure elucidation was confirmed by spectroscopic experiments including 1D and 2D NMR and HR-ESI-MS. The cytotoxic activities against three human cancer cell lines (A-549, HeLa and PANC-1) of all isolated compounds were evaluated by MTT-based colorimetric assays. Compound 1 exhibited selective cytotoxicity against the A549 cell line with IC50 of 14.79 ± 0.91 μM.
Research Interests: Chemistry, Traditional Medicine, Magnetic Resonance Spectroscopy, Cytotoxicity, Medicine, and 15 moreMultidisciplinary, Humans, Anthozoa, Animals, Natural Product, Stereochemistry, Sesquiterpenes, Coral, Cancer Cell Lines, HeLa cells, HeLa, Antineoplastic Agents, Minimum inhibitory concentration, Molecular Structure, and Minimum Inhibitory Concentration
Research Interests: Geography, Conservation Biology, Conservation, Southeast Asia, Environmental Planning, and 15 moreBiodiversity, Research, Biological Sciences, Biodiversity Conservation, Environmental Sciences, Environmental Resource Management, Biological Conservation, Elements, Wildlife, Extinction, Research Priorities, Threatened Species, Expert Elicitation, Sustainability, and Uncategorized
An extensive rehabilitation was practiced during 2002 - 2004 in southernQui Nhon bay of coastal Binh Dinh province where coral reefs had suffered serious degradation due to coral mining, destructive fishing and overfishing. The first... more
An extensive rehabilitation was practiced during 2002 - 2004 in southernQui Nhon bay of coastal Binh Dinh province where coral reefs had suffered serious degradation due to coral mining, destructive fishing and overfishing. The first experiment indicated that the nearshore reefs in the western part could not be rehabilitated due to environment change during rainy season with large discharge of sediment and freshwater. Transplanted hard corals adapted well in southern part of island Hon Ngang and Hon Nhan with the techniques that used dead coral substratum, concrete plates and revered tubs as theattachments of corals. Survival rate of branch corals Acropora was quite high in dry season (85- 100%) but reduced during rainy season (60-80%). Meanwhile Porites nigrescens presented good adaptation to environment seasonal change. The corals which were fixed with steel sticks on reefplatform had low survival rate due to sediment movement in north-east monsoon. The concurrent site management ...
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Ocean warming is increasing the incidence, scale, and severity of global-scale coral bleaching and mortality, culminating in the third global coral bleaching event that occurred during record marine heatwaves of 2014-2017. While local... more
Ocean warming is increasing the incidence, scale, and severity of global-scale coral bleaching and mortality, culminating in the third global coral bleaching event that occurred during record marine heatwaves of 2014-2017. While local effects of these events have been widely reported, the global implications remain unknown. Analysis of 15,066 reef surveys during 2014-2017 revealed that 80% of surveyed reefs experienced significant coral bleaching and 35% experienced significant coral mortality. The global extent of significant coral bleaching and mortality was assessed by extrapolating results from reef surveys using comprehensive remote-sensing data of regional heat stress. This model predicted that 51% of the world’s coral reefs suffered significant bleaching and 15% significant mortality, surpassing damage from any prior global bleaching event. These observations demonstrate that global warming’s widespread damage to coral reefs is accelerating and underscores the threat anthropo...
Fig. 4. Diagram showing covers of corals at 15 study sites along Ninh Hai district.
Fig. 1. Sites for inventory of reef building scleratinian corals (• in 2003 & 2004 and * in 2011 & 2012), and reef distribution in the Ninh Hai coastal waters
Fig. 2. Dendrogram of similarity in coral community types, derived from the species–abundances (4th root transformed) of corals in 24 sites using Eucidean distance and complete linkage.
recovering trochus resources is artificial breeding and the release of larvae and juveniles back into the
The models of coral reef management for the development of ecological tourism were conducted under the coordination among the 3 businesses (Khanh Hoa Salanganes Nest Company, Vinpearl Nha Trang and Tri Nguyen Tourism), Institute of... more
The models of coral reef management for the development of ecological tourism were conducted under the coordination among the 3 businesses (Khanh Hoa Salanganes Nest Company, Vinpearl Nha Trang and Tri Nguyen Tourism), Institute of Oceanography and Khanh Hoa Department of Natural Resources Environment. The analysis of trends of coral cover, density of reef fishes and big size invertebrates at 3 sites allowed assessing effectiveness of 3 years’ management. The stability of hard coral cover, except the decline at southern Hon Tam due to impacts of the typhoon in Nov., 2017 indicated no increased damage to corals from human activities. However, the dominance of small size fish ( 10 cm in length), the decline of density of larger size fish and the poorness of large size invertebrate showed continuous overexploitation at these managed areas.Mô hình quản lý rạn san hô vì mục đích du lịch sinh thái được thực hiện với sự tham gia của Viện Hải dương học, Sở Tài nguyên và Môi trường Khánh Hòa...
Research Interests: Earth Sciences, Decision Making, Design Management, Political Science, Environmental Sciences, and 10 moreSouth China Sea, Information Exchange, Fishery Management, Integrated Coastal and Ocean Management, Environmental degradation, United Nations Environment Programme, Regional Cooperation, Elsevier, Production Services, and area of concern
The studies on coral bleaching were conducted at 21 sites of 4 reef areas in Southern Vietnam, using point transect technique in June–July 2019. Cover of hard corals in the selected sites was quite high with the average values of 65.6 ±... more
The studies on coral bleaching were conducted at 21 sites of 4 reef areas in Southern Vietnam, using point transect technique in June–July 2019. Cover of hard corals in the selected sites was quite high with the average values of 65.6 ± 18% % in Con Dao islands, 58.7 ± 26.2% in Ninh Thuan coastal waters, 55.9 ± 17.8% in Phu Quoc island but lower in Nha Trang bay (22.8 ± 15.9%). Soft corals were not abundant with the highest cover in Nha Trang bay (4.73 ± 5.5%) and the lowest in Ninh Thuan (0.16 ± 0.3%). Hard corals were most impacted in Nha Trang bay with 39.5 ± 8.1% bleached, followed by Ninh Thuan reefs (32.9 ± 13.3%), Con Dao Islands (25.0 ± 11.1%) and least affected in Phu Quoc island (7.3 ± 9.05%). For soft corals, ratios of bleached corals were 79.4%, 65.8% and 23.8% in Con Dao islands, Nha Trang bay and Ninh Thuan reefs respectively. No bleached soft coral was recorded in Phu Quoc. At the genus level, Acropora corals were severely affected in Nha Trang bay, Ninh Thuan reefs a...
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The models of coral reef management for the development of ecological tourism were conducted under the coordination among the 3 businesses (Khanh Hoa Salanganes Nest Company, Vinpearl Nha Trang and Tri Nguyen Tourism), Institute of... more
The models of coral reef management for the development of ecological tourism were conducted under the coordination among the 3 businesses (Khanh Hoa Salanganes Nest Company, Vinpearl Nha Trang and Tri Nguyen Tourism), Institute of Oceanography and Khanh Hoa Department of Natural Resources & Environment. The analysis of trends of coral cover, density of reef fishes and big size invertebrates at 3 sites allowed assessing effectiveness of 3 years’ management. The stability of hard coral cover, except the decline at southern Hon Tam due to impacts of the typhoon in Nov., 2017 indicated no increased damage to corals from human activities. However, the dominance of small size fish (< 10 cm in length), the decline of density of larger size fish and the poorness of large size invertebrate showed continuous overexploitation at these managed areas.
Reef Check with more detail records was used to monitor variation of coral community of Con Dao archipelago. By April 1998, exposed reefs showed major hard coral cover loss (up to 100%) due to the typhoon, while repeated surveys of 6... more
Reef Check with more detail records was used to monitor variation of coral community of Con Dao archipelago. By April 1998, exposed reefs showed major hard coral cover loss (up to 100%) due to the typhoon, while repeated surveys of 6 sites not hit by the typhoon revealed that high coral cover was still present. Follow-up surveys in October 1998 coincided with the world-wide bleaching event. The frequency of coral colonies suffering bleaching ranged from 0 to 74.2 % (n=11 sites) with a mean value of 37 % not including more than 10 % considered as mortality up to this time. The soft coral Sinularia was most affected by bleaching with almost 100 % colonies bleached and then the fire coral Millepora (83%). The hard corals belonging to strongly impacted group included Porites (57%), Symphyllia (42%), Leptastrea (40%), …and also Acropora. Contrarily, there was no bleaching among 45 Galaxea colonies observed. In July 1999, most reefs showed recovery with some new recruits evident, but cora...