Status and threats on seagrass beds using GIS in Vietnam

Luong, Cao Van; Thao, Nguyen Van; Komatsu, Toshimitsu; Ve, Nguyen Dac; Tien, Dam Duc

doi:10.1117/12.977277

Cited by 14 publications

(15 citation statements)

References 9 publications

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“…Lchiro-inositol, a high proportion (up to 2.5% of dry weight) in seagrass Syringodium flotsam, presented anti-diabetes activity. It is estimated that there are about 14 species of seagrasses in Vietnam, belonging to 4 families, occupying an area of about 17,000 ha [8].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of biological activities of some seaweed and seagrass species in the coastal area of Vietnam

Hương

Cuong

et al. 2019

JMST

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Although seaweeds and seagrasses have been used for food and traditional medicine for centuries, merely a small amount of them is exploited and used. Positive biological activities of seaweed and seagrass products on humans, animals and plants have also been recorded for a long time. Vietnam is a tropical country with 3,260 km long coastline and about 350 species of seaweeds, including 60 widely used species. In this study, 57 seaweed and seagrass samples were extracted using CHCl3/MeOH solvent systems and their crude extracts were tested for selected biological actives, including antimicrobial, antioxidant activities and cytotoxicity. The results revealed that 13 out of 57 extracts (accounting for 24.07%) were cytotoxic to one of the two tested cancer cell lines (Hepatocellular carcinoma cell line Hep-G2 and human lung adenocarcinoma cell line LU-1), and 4 extracts (accounting for 7.4%) were cytotoxic to both cancer cell lines. In antimicrobial activity assay, 18 of all 57 extracts (accounting for 37.5%) were capable of inhibiting 1 to 2 test microorganisms and 16 extracts (accounting for 33.33%) inhibited at least 3 test microorganisms. There were solely 1 extract (accounting for 1.85%) of the 57 extracts performing antioxidant activity in DPPH (1,1-diphenyl-2-picrylhydrazyl) radical scavenging assay.

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Section: Introductionmentioning

confidence: 99%

Evaluation of biological activities of some seaweed and seagrass species in the coastal area of Vietnam

Hương

Cuong

et al. 2019

JMST

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“…Comparison of the number of seagrass species in the Truong Sa archipelago with some islands (table 4 and figure 4) reveals that the number of seagrasses in the Truong Sa archipelago (8 species) is only smaller than that in Con Dao islands (10 species) and Phu Quoc islands (9 species) [7,19], but equal to or one to two species higher than that in other islands and regions such as Phu Quy (Vietnam), Cape Bolinao, Palawan region (Philippines) and Hai Nam islands (China) [7,[19][20][21]. Acreage and species composition of some seagrass beds in Vietnam [4,7,19] Bottom sediments of places with seagrass growing are sands and dead corals with the rate of 80% sands and 20% dead corals [1] and the depth from 0.5 m to 2 m (except for Song Tu Tay island with seagrass found at 12-30 m deep).…”

Section: The Distribution Characteristics Of Seagrass Bedsmentioning

confidence: 99%

“…Combining this estimation with seagrass bed area in Nam Yet island (10 ha) [1], the total area estimation for seagrass beds in the Truong Sa archipelago would be 1,190 hectares, ranked third among regions with the largest seagrass area in Vietnam ( fig. 3), after Phu Quoc islands (10,063 ha) and Tam Giang -Cau Hai lagoons (2,063 ha) [4,19].…”

Section: The Acreage and Coveragementioning

confidence: 99%

The status of seagrass communities in the Truong Sa archipelago

Luong

Linh

Hung

et al. 2020

VJMST

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Seagrasses in Truong Sa archipelago have not been intensively studied and understood, even in some obviously progressive works recently published. It is essential to carry out much more researches to fill up understanding gaps of seagrasses in the area. In 2019, within the framework of the project coded KC09.29/16–20, two surveys were conducted for three selected islands (Truong Sa Lon, Thuyen Chai and Song Tu Tay) in the area, focusing on marine ecosystems including seagrass beds. Survey results in the selected islands show eight seagrass species (one new record), the estimated total distribution area of 1,190 ha, the total reserve of biomass reaching 7,417.2 tons.dry, equivalent to 11,432.8 tons.CO2.

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“…Tam Giang -Cau Hai (TG -CH) lagoon is one of the places having well-developed seagrass beds, with the largest seagrass distribution area in Vietnam [2,3]. The total economic value of every 1.000 hectares of seagrass here is worth about 2.4 million USD.…”

Section: Introductionmentioning

confidence: 99%

“…The total economic value of every 1.000 hectares of seagrass here is worth about 2.4 million USD. However, assessments in 2010 showed that the quality of seagrass beds (area, coverage and biomass) was reduced by 40-50% compared to the 1990s, leading to the reduction of resources of biological species at an alarming level [3]. In order to protect, rehabilitate and sustainably develop seagrass resources in the Tam Giang -Cau Hai lagoon, an appropriate management, protection and exploitation plan is required.…”

Section: Introductionmentioning

confidence: 99%

Hydrophyte communities in the Tam Giang - Cau Hai lagoon

Luong

Tien

Nga

2020

VJMST

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The Tam Giang - Cau Hai lagoon in Thua Thien-Hue province is the largest lagoon in South East Asia and also one of the places having the largest area of seagrass in Vietnam. The study results from 2009 to 2017 showed that 6 seagrasses species were identified (Halodule uninervis is a newly recorded species, however, Halophila minor is not recorded) and there were 8 freshwater grass species (with the exception of Potamogeton maackianus), with a total area of 2,840 ha. In particular, the area of seagrass has been recovering significantly from 1,000 hectares in 2009 to 2,037 hectares in 2017.

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Status and threats on seagrass beds using GIS in Vietnam

Cited by 14 publications

References 9 publications

Evaluation of biological activities of some seaweed and seagrass species in the coastal area of Vietnam

Evaluation of biological activities of some seaweed and seagrass species in the coastal area of Vietnam

The status of seagrass communities in the Truong Sa archipelago

Hydrophyte communities in the Tam Giang - Cau Hai lagoon

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