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  • 1
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    Table_6.DOCX
    Frontiers Media SA ; 2021
    In:  Frontiers in Conservation Science Vol. 2 ( 2021-9-17)
    Details
    In: Frontiers in Conservation Science, Frontiers Media SA, Vol. 2 ( 2021-9-17)
    Abstract: Lagoonal environments exhibit high levels of instability depending on hydrological, climatic and ecological factors, thereby influencing the distribution and structure of submerged plant communities. Conditions typically fluctuate widely due to the interaction of freshwater from rivers with saltwater from the sea, as well as from aquaculture activities that together influence submerged hydrophyte community spatial and temporal variability depending on plant survival strategies. Ruppia species feature either underwater pollination mediated by an air bubble or by the release of pollen floating at the water surface, the former promoting self-pollination. Tropical Asian Ruppia brevipedunculata Yu and den Hartog was assumed to pollinate below the water surface and identified as a separate lineage among selfed Ruppia taxa. We used nine nuclear microsatellites to estimate inbreeding levels and connectivity of R. brevipedunculata within a large SE Asian lagoon complex. Ruppia brevipedunculata meadows were strongly inbred as could be derived from the many monomorphic or totally fixed loci for unique alleles in different parts of the lagoon, which appears consistent with selfing behavior. Those from aquaculture ponds were highly inbred ( F IS = 0.620), though less than open lagoon sites that showed nearly total inbreeding ( F IS = 0.942). Ruppia brevipedunculata from two major lagoon parts were highly differentiated with spatially structured gene pools and a strong barrier between parts of the lagoon over a 30 km distance. Migration-n analysis indicated unidirectional though limited gene flow and following potential hydrological connectivity. Overall, private alleles under homozygote conditions explained a stronger genetic differentiation of populations situated inside aquaculture ponds than of open lagoon populations. Kinship values were only relevant up to 5 km distance in the open lagoon. Within a confined area of aquaculture ponds featuring dense vegetation in stagnant water, there would be opportunity for mixed pollination, thereby explaining the higher diversity of unique multilocus genotypes of aquaculture pond habitats. Low connectivity prevents gene pools to homogenize however promoted sites with private alleles across the lagoon. Complex hydrodynamic systems and human-made habitats enclosed by physical structures impose barriers for propagule dispersal though may create refugia and contribute to conserving regional genetic diversity.
    Type of Medium: Online Resource
    ISSN: 2673-611X
    URL: Article
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    DOI: 10.3389/fcosc.2021.723376
    DOI: 10.3389/fcosc.2021.723376.s001
    DOI: 10.3389/fcosc.2021.723376.s002
    DOI: 10.3389/fcosc.2021.723376.s003
    DOI: 10.3389/fcosc.2021.723376.s004
    DOI: 10.3389/fcosc.2021.723376.s005
    DOI: 10.3389/fcosc.2021.723376.s006
    DOI: 10.3389/fcosc.2021.723376.s007
    DOI: 10.3389/fcosc.2021.723376.s008
    DOI: 10.3389/fcosc.2021.723376.s009
    DOI: 10.3389/fcosc.2021.723376.s010
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 3060831-4
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  • 2
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    Response to salinity of the submerged aquatic vegetation species \(\textit{Najas indica}\) (Willd.) Cham.
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Marine Science and Technology Vol. 22, No. 1 ( 2022-03-31), p. 29-35
    Details
    In: Vietnam Journal of Marine Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 1 ( 2022-03-31), p. 29-35
    Abstract: Najas indica (Willd.) Cham is known as a freshwater species of submerged aquatic vegetation. However, this species is widely distributed in both freshwater and brackish environments. This study examined the survival, growth rate and morphological performance of N. indica collected from the Cau Hai lagoon (Thua Thien Hue) against different salinity treatments in a mesocosm experiment to determine the optimal salinity for the species. The results showed significant effects of different salinities on survival rates, growth, biomass, and the morphological characteristics of N. indica. The species could survive and continue growing at 0–15 ppt but died completely at 20 ppt and 25 ppt after the first week of the 8-week experiment. Leaf length tended to be shorter in higher salinity. Shoot length, the number of internodes and branches per shoot, biomass reached the highest values at 5 ppt and 10 ppt. These suggested that the optimal salinity of the N. indica was at a range of 5–10 ppt. Study results were informative to explain the distribution change of the freshwater originated hydrophyte N. indica in lagoon environments in Vietnam.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/16072
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 3
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    A case study of phytoplankton used as a biological index for water quality assessment of Nhu Y river, Thua Thien - Hue
    Ministry of Science and Technology, Vietnam (VMOST) ; 2018
    In:  Vietnam Journal of Science, Technology and Engineering Vol. 60, No. 4 ( 2018-12-30), p. 45-51
    Details
    In: Vietnam Journal of Science, Technology and Engineering, Ministry of Science and Technology, Vietnam (VMOST), Vol. 60, No. 4 ( 2018-12-30), p. 45-51
    Abstract: Studies of the composition and density of phytoplankton and the water quality of Nhu Y river were conducted over six months (March to August 2011). Phytoplankton samples were collected by filtration and immediately preserved in Lugol’s solution. The phytoplankton species composition recorded 117 species belonging to six divisions: Cyanobacteria (24 taxa), Bacillariophyta (14 taxa), Chlorophyta (45 taxa), Euglenophyta (31 taxa), Cryptophyta (2 taxa), and Dinophyta (1 taxa), of which Chlorophyta and Euglenophyta were dominant in terms of species numbers. The total phytoplankton density fluctuated from 110,146 to 5,964x103individuals/litre and Cyanophyta were dominant in terms of individual density. The algal genus pollution index (Palmer index) ranged from 30 to 41, indicating that the water was highly organically polluted, and the Shannon-Weiner index results of 0.66-2.92 showed moderately to heavily polluted water. With values for the Diatomeae index of more than 0.2, the quality of the eight sites during the period of the study showed that the aquatic environment was eutrophic. Phytoplankton and their indexes are useful tools for assessing water environment quality.
    Type of Medium: Online Resource
    ISSN: 2525-2461
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.31276/VJSTE.60(4)
    DOI: 10.31276/VJSTE.vol(number).page
    DOI: 10.31276/VJSTE.60(4).45-51
    Language: Unknown
    Publisher: Ministry of Science and Technology, Vietnam (VMOST)
    Publication Date: 2018
    detail.hit.zdb_id: 3145662-5
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  • 4
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    Table_6.DOCX
    Frontiers Media SA ; 2021
    In:  Frontiers in Plant Science Vol. 12 ( 2021-6-4)
    Details
    In: Frontiers in Plant Science, Frontiers Media SA, Vol. 12 ( 2021-6-4)
    Abstract: Human-induced land use in coastal areas is one of the main threats for seagrass meadows globally causing eutrophication and sedimentation. These environmental stressors induce sudden ecosystem shifts toward new alternative stable states defined by lower seagrass richness and abundance. Enhalus acoroides , a large-sized tropical seagrass species, appears to be more resistant toward environmental change compared to coexisting seagrass species. We hypothesize that reproductive strategy and the extent of seedling recruitment of E. acoroides are altered under disturbance and contribute to the persistence and resilience of E. acoroides meadows. In this research, we studied eight populations of E. acoroides in four lagoons along the South Central Coast of Vietnam using 11 polymorphic microsatellite loci. We classified land use in 6 classes based on Sentinel-2 L2A images and determined the effect of human-induced land use at different spatial scales on clonal richness and structure, fine-scale genetic structure and genetic diversity. No evidence of population size reductions due to disturbance was found, however, lagoons were strongly differentiated and may act as barriers to gene flow. The proportion and size of clones were significantly higher in populations of surrounding catchments with larger areas of agriculture, urbanization and aquaculture. We postulate that large resistant genets contribute to the resilience of E. acoroides meadows under high levels of disturbance. Although the importance of clonal growth increases with disturbance, sexual reproduction and the subsequent recruitment of seedlings remains an essential strategy for the persistence of populations of E. acoroides and should be prioritized in conservation measures to ensure broad-scale and long-term resilience toward future environmental change.
    Type of Medium: Online Resource
    ISSN: 1664-462X
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    DOI: 10.3389/fpls.2021.658213
    DOI: 10.3389/fpls.2021.658213.s001
    DOI: 10.3389/fpls.2021.658213.s002
    DOI: 10.3389/fpls.2021.658213.s003
    DOI: 10.3389/fpls.2021.658213.s004
    DOI: 10.3389/fpls.2021.658213.s005
    DOI: 10.3389/fpls.2021.658213.s006
    DOI: 10.3389/fpls.2021.658213.s007
    DOI: 10.3389/fpls.2021.658213.s008
    DOI: 10.3389/fpls.2021.658213.s009
    DOI: 10.3389/fpls.2021.658213.s010
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2021
    detail.hit.zdb_id: 2687947-5
    detail.hit.zdb_id: 2613694-6
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  • 5
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    Sample decomposition to determine microplastics in parts of mullets
    Hue University ; 2023
    In:  Hue University Journal of Science: Natural Science Vol. 132, No. 1A ( 2023-03-31)
    Details
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 132, No. 1A ( 2023-03-31)
    Abstract: In this study, a 10% KOH solution was used to decompose the meat, skin, and digestive system of mullets. The factors in each experiment are as follows: 1) VKOH:mmeat is 10/1 (mL·g–1), incubated at 25 °C for 72 h; VKOH:mskin is 15/1 (mL·g–1), incubated at 40 °C for 72 h; VKOH:mdigestive system is 20/1 (mL·g–1), incubated at 40 °C for 72 h. The actual sample images display microplastics in the surveyed parts of the mullets with different shapes and colours.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    URL: Article
    DOI: 10.26459/hueunijns.v132i1A
    DOI: 10.26459/hueunijns.v132i1A.7095
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2023
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  • 6
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    Quantifying Shoot Density and Biomass of Seagrass Beds in the Central Coast of Vietnam
    David Publishing Company ; 2020
    In:  Journal of Environmental Science and Engineering B Vol. 9, No. 2 ( 2020-04-28)
    Details
    In: Journal of Environmental Science and Engineering B, David Publishing Company, Vol. 9, No. 2 ( 2020-04-28)
    Type of Medium: Online Resource
    ISSN: 2162-5263 , 2162-5271
    URL: Issue
    URL: Journal
    URL: Article
    DOI: 10.17265/2162-5263/2020.02
    DOI: 10.17265/2162-5263
    DOI: 10.17265/2162-5263/2020.02.002
    Language: Unknown
    Publisher: David Publishing Company
    Publication Date: 2020
    detail.hit.zdb_id: 2851245-5
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  • 7
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    Effects of salinity on seedling gemination and growth of early seedlings of the \(\textit{Najas indica}\) (Willd.) Cham.
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Marine Science and Technology Vol. 22, No. 2 ( 2022-06-21), p. 199-207
    Details
    In: Vietnam Journal of Marine Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 2 ( 2022-06-21), p. 199-207
    Abstract: Najas indica (Willd.) Cham. is a freshwater submerged aquatic vegetation. N. indica is an annual plant. Therefore, seeds in the sediment and the survival and growth of seedlings play an important role in re-establishing new populations of the species. The purpose of this study was to determine the seed density in the sediment, examine the effect of salinity on seedling germination from seeds, and assess the impact of the salinity on the growth of early seedlings of N. indica under the experimental condition. The seed density of N. indica was highest from September to November and the lowest in May to July 2018. Seedlings of the species were observed in the range of salinity from 0–15‰. No seedling was recorded at 20‰ salinity during the experimental period. The number of seedlings, growth rate, shoot length, and the number of internodes of seedlings of N. indica, all had maximum values at a salinity of 5‰, while leaf length tended to decrease with increasing salinity. The study showed that the optimum salinity for seedling germination from seeds and growth of seedlings of N. indica species from the Cau Hai lagoon was at 5‰ salinity. The study results supply the necessary information for the protection and development of meadows of the N. indica species in the lagoon environment of Vietnam.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/17075
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 8
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    Morphological and distribution characteristics of \(\textit{Halophila beccarii}\) Aschers., 1871 in the Cau Hai lagoon, Thua Thien Hue province, Vietnam
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2022
    In:  Vietnam Journal of Marine Science and Technology Vol. 22, No. 3 ( 2022-08-19)
    Details
    In: Vietnam Journal of Marine Science and Technology, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 3 ( 2022-08-19)
    Abstract: Halophila beccarii Aschers., 1871 was one of the seagrass species that was vulnerable and threatened list by the International Union for Conservation of Nature (IUCN). During the survey period from March 2018 to September 2019, our results showed that H. beccarii was widely distributed in the Cau Hai lagoon and concentrated mainly in the Southeast area of the lagoon. The distribution of H. beccarii was seasonal. The species’ growth started from the early rainy season of the previous year until the end of the dry season of the following year. However, the period when the species had a high cover, biomass, and shoot density was from September 2018 to March 2019, and those values peaked in January 2019. The lowest cover and shoot density were recorded in November 2019, while the lowest biomass was in July 2019. The rainfall had a close positive correlation with the biomass of H. beccarii, while water salinity and water temperature were moderate negatively correlated with the biomass of the species.
    Type of Medium: Online Resource
    ISSN: 1859-3097
    URL: Article
    DOI: 10.15625/1859-3097/17093
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2022
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  • 9
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    Growth and morphological responses of Halophila beccarii to low salinity
    Hue University ; 2022
    In:  Hue University Journal of Science: Natural Science Vol. 131, No. 1B ( 2022-06-30), p. 47-57
    Details
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 131, No. 1B ( 2022-06-30), p. 47-57
    Abstract: Halophila beccarii Ascherson is classified as a threatened seagrass species by IUCN because of the reductive tendency of ​​its distribution area. This seagrass is considered a euryhaline species adapted to a wide range of salinities from freshwater and brackish water to marine water. Previous studies showed that the species tends to grow better under low salinity; however, its optimum salinity has not been determined. In Vietnam, H. beccarii grows in habitats with low salinity (0–20 ppt). The results show that salinity affects the growth, survival rate, shoot density, biomass, and morphological characteristics of the grass. The leaf dimension is more prolonged and broader; the petiole and shoot length are longer at 10 ppt salinity. In contrast, both the number of shoots and biomass peak at 5 ppt and decrease at lower and higher salinities. The study reveals that H. beccarii can grow better under mesohaline conditions than freshwater and hypersaline conditions with an optimum salinity at 5–10 ppt. These findings would explain the species’ distribution dynamics in coastal environments and be helpful information for conserving the seagrass populations in habitats with fluctuating salinity as coastal lagoons in Central Vietnam.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    URL: Article
    DOI: 10.26459/hueunijns.v131i1B
    DOI: 10.26459/hueunijns.v131i1B.6452
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2022
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  • 10
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    ĐẶC ĐIỂM HÌNH THÁI VÀ PHÂN BỐ CỦA LOÀI RONG CÁM NAJAS INDICA (WILD.) CHAM. Ở ĐẦM CẦU HAI, TỈNH THỪA THIÊN HUẾ
    Hue University ; 2020
    In:  Hue University Journal of Science: Natural Science Vol. 129, No. 1A ( 2020-03-20), p. 107-114
    Details
    In: Hue University Journal of Science: Natural Science, Hue University, Vol. 129, No. 1A ( 2020-03-20), p. 107-114
    Abstract: Bài báo trình bày kết quả nghiên cứu đặc điểm hình thái và phân bố của loài rong cám Najas indica ở đầm Cầu Hai trong khoảng thời gian từ tháng 3/2018 đến 3/2019. N. indica có phân bố khá rộng ở đầm Cầu Hai, từ khu vực giữa đầm hướng vào bờ phía Tây, có mặt ở 10/21 điểm khảo sát. Độ phủ và sinh khối của N. indica có sự khác biệt ở các tháng khảo sát. Độ phủ và sinh khối của rong bắt đầu gia tăng từ tháng 4. Độ phủ cao nhất đạt được trong khoảng thời gian từ tháng 7 đến 11 (49,33 ± 15,05%÷52,60 ± 12,28%) và sinh khối đạt cực đại vào tháng 7 (93,61 ± 35,60 g/m²); sau đó giảm dần. Độ mặn và nhiệt độ không khí thể hiện sự ảnh hưởng đến biến động phân bố của N. indica ở đầm Cầu Hai, trong đó, nhiệt độ không khí có mối tương quan chặt với sinh khối còn độ mặn chỉ thể hiện tương quan yếu với sinh khối và độ phủ của loài.
    Type of Medium: Online Resource
    ISSN: 2615-9678 , 1859-1388
    URL: Issue
    URL: Article
    DOI: 10.26459/hueuni-jns.v129i1A
    DOI: 10.26459/hueuni-jns.v129i1A.5638
    Language: Unknown
    Publisher: Hue University
    Publication Date: 2020
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