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  • 1
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    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26386 | 23782 | 2019-04-05 08:35:51 | 26386 | Southeast Asian Fisheries Development Center, Secretariat
    Publication Date: 2021-07-24
    Description: Distribution of phytoplankton pigments was investigated in the relation to Chlorophyll a (Chl-a) and light intensity in Vietnamese waters located at longitude 102E - 112W, latitute 23N - 7N. Over 200 samples collected at 58 stations were analyzed for pigments (Chlorophyll a, b, c and carotenoids) and degradation products (Phaeophytill). Chlorophyll a was measured by fluorescence. Results show that average values in the seawater were 0.18 ± 0.04 mg.m-3 for Chl-a; 0.05 ± 0.01 mg.m-3 for Chl-b; 0.062 mg.m-3 for Phaeophytill. Higher value of Chl-a occurred at the thermocline but maxima were found at 75 or 50m depths. Average value of Carotenoids concentration was very low about 0.052 ± 0.12 mg.m-3. The report used a model for the relationship between Chlorophyll a content and light intensity to estimate the primary production. Average value of primary production was about 9.04 mgC.m3.day-1 at the surface and 2.63 mgC.m3.day-1 at the bottom. The relationship between Chlorophyll and some environmental parameters such as temperature, salinity was examined. The effects of thermocline and halocline to the primary production were analyzed.
    Keywords: Biology ; Oceanography ; Chlorophylls ; Photosynthetic pigments ; Phytoplankton ; Primary production ; Carotenoids ; Vertical profiles ; Viet Nam ; South China Sea
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 233-250
    Format: 18
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  • 2
    Publication Date: 2021-05-19
    Description: In the Vietnamese waters, the value of Chlorophyll a concentration ranged from 0.29 to 2.58mg.m-3, average value of 1.20  0.76mg.m-3 for the shallow waters and from 0.05 to 1.24mg.m-3, average value of 0.37  0.37mg.m-3 for the continental shelf waters. In the offshore, the Chlorophyll a concentration is relatively lower, ranged from 0.13 to 0.24 mg.m-3. The assimilated carbon index in the waters of Vietnamese continental shelf ranged from 0.84 to 4.25 mgC.mgChl-a-1.day-1, average value is 1.66  0.95 mgC.mgChl-a-1.day-1. In the culture pools, bay and coastal waters, the assimilated carbon index is highest, average value of 121.59  25.99mgC.mgChl-a-1.day-1. Using the Chlorophyll a concentration to assess primary production with the experimental equation showed that primary production ranged from 100 - 500mg.m-3.day-1 in coastal waters. In the offshore, primary production value is lower, ranged from 0.07 to 30 mgC.m-3. day-1. The studied results argued that ecological conditions in the coastal zone give facility for the process of primary production and phytoplankton development.
    Description: Published
    Keywords: Seawater ; Chlorophyll a
    Repository Name: AquaDocs
    Type: Journal Contribution , Not Known
    Format: pp. 96-106
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