Unknown
Secretariat, Southeast Asian Fisheries Development Center
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Bangkok, Thailand
In:
http://aquaticcommons.org/id/eprint/26386
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23782
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2019-04-05 08:35:51
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26386
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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
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Oceanography
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Chlorophylls
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Photosynthetic pigments
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Phytoplankton
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Primary production
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Carotenoids
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Vertical profiles
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Viet Nam
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South China Sea
Repository Name:
AquaDocs
Type:
book_section
Format:
application/pdf
Format:
application/pdf
Format:
233-250
Format:
18
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