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  • 1
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    Species composition, abundance and distribution of phytoplankton in the thermocline layer in the South China Sea, Area III: Western Philippines (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26268 | 2002 | 2019-02-22 07:03:16 | 26268 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-09-24
    Description: Phytoplankton density, taxonomic composition and distribution in the thermocline layer were investigated to compare with those in the surface layer of 31 stations in the western Philippines during 17 April – 9 May 1998. The samples were collected from surface, thermocline depth (the beginning of thermocline), and chlorophyll maximum depth. In this study, thermocline depth and chlorophyll maximum depth were included in the thermocline layer. Three hundred and thirty-eight taxa, composed of 2 species of blue green alga, 144 species of diatoms and 168 species of dinoflagellates were identified. The occurrence of the species in each sampling depth were recorded. Phytoplankton densities at chlorophyll maximum depth were mostly highest among the sampling depths observed. The most abundance was 20,683 cells/l found at thermocline depth of station 24 due to the blooms of many diatom species. Oscillatoria (Trichodesmium) erythraea and Chaetoceros lorenzianus were dominant from surface through chlorophyll maximum depth. Seven species of diatoms presented as the dominant species only in the thermocline layer. The toxic dinoflagellates were found in low cell densities. Diversity and evenness indices of phytoplankton at chlorophyll maximum depth were high.
    Keywords: Fisheries ; Oceanography ; Dominant species ; Abundance ; Population density ; Phytoplankton ; Thermocline ; South China Sea ; Philippines ; Dinoflagellata ; Bacillariophyceae
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 197-216
    Format: 20
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  • 2
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    Species composition, abundance and distribution of phytoplankton in the thermocline layer in the South China Sea, Area IV: Vietnamese waters (2021)
    Secretariat, Southeast Asian Fisheries Development Center | Bangkok, Thailand
    In:  http://aquaticcommons.org/id/eprint/26389 | 23782 | 2019-04-08 06:20:34 | 26389 | Southeast Asian Fisheries Development Center, Secretariat
    Details
    Publication Date: 2021-09-24
    Description: One hundred and eighty-five samples of phytoplankton were collected from 58 stations in the Vietnamese waters during 30 April – 29 May 1999 to investigated species composition, abundance and distribution in the thermocline layer compared with those in the surface layer. The samples were taken from surface, thermocline depth and chlorophyll maximum depth. In this study, thermocline depth and chlorophyll maximum depth were included in the thermocline layer. Three hundred and fifty- seven taxa, composed of 2 species of blue green alga, 159 species of diatoms and 161 species of dinoflagellates, were identified. The occurrence of species in each layer was recorded. The cell densities at chlorophyll maximum depth were highest among the sampling depths observed in most stations of the survey. Data obtained from the samples collected from surface to 150 m with 25 m interval to study vertical distribution indicates that maximum cell density of the water column presented between 60 – 110 m. The most abundance was 179,386 cells/l found at chlorophyll maximum depth near the Ca Mau Cape due to the bloom of many diatom species. Oscillatoria ( Trichodesmium ) erythraea, Proboscia alata, Pseudosolenia calcar-avis and Thalassionema frauenfeldii were dominant at all sampling depths. Five species of diatoms presented as dominant species only in the thermocline layer. Alexandrium was frequently found at surface through chlorophyll maximum depth in the south. Diversity and evenness indices of all sampling depths were high in the Gulf of Tonkin and decreased through the south of Vietnam. These indices were high in the thermocline layer.
    Keywords: Oceanography ; Geographical distribution ; Community composition ; Abundance ; Check lists ; Phytoplankton ; Thermocline ; Algae ; Pseudosolenia calcar-avis ; Alexandrium ; Thalassionema frauenfeldii ; Proboscia alata ; Oscillatoria erythraea ; Oscillatoria ; Viet Nam ; South China Sea
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 292-309
    Format: 18
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  • 3
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    Distribution, abundance and species composition of phytoplankton in the South China Sea, Area II: Sabah, Sarawak and Brunei Darussalam (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26410 | 23782 | 2019-04-10 07:42:33 | 26410 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2021-09-24
    Description: Four hundred and four samples of phytoplankton were collected from 79 stations in Sabah, Sarawak and Brunei Darussalam waters, during 2 cruises of M.V. SEAFDEC, 10 July - 2 August 1996 and 1 – 24 May 1997. The Samples were collected from surface, seasonal thermocline and chlorophyll maximum depth. Three hundred and ten taxa, composed of 2 species of blue green alga, 139 species of diatoms and 150 species of dinoflagellates, were identified. The occurrence of phytoplankton species in each layer were recorded. The species frequently found predominant in the surface layer were Oscillatoria erythraea, Thalassionema frauenfeldii and Pseudosolenia calcaravis, and in the chlorophyll maximum layer were Oscillatoria erythraea, Thalassionema frauenfeldii, Chaetoceros affinis, C. messanensis and Fragilariopsis doliolus. Small numbers of toxic dinoflagellates were observed. Quantity of phytoplankton in the chlorophyll maximum layer was most abundant among the three layers observed. Diversity and evenness indices of phytoplankton in this layer were high during both sampling periods.
    Keywords: Oceanography ; Vertical distribution ; Dominant species ; Community composition ; Species diversity ; Phytoplankton ; Surface layers ; Biological sampling ; South China Sea ; Malaysia ; Sarawak ; Sabah ; Brunei Darussalam ; Pseudosolenia calcaravis ; Chaetoceros affinis ; Thalassionema frauenfeldii ; Chaetoceros messanensis ; Oscillatoria erythraea ; Bacillariophyceae ; Fragilariopsis doliolus ; Cyanophyta ; Dinophyta
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 177-196
    Format: 20
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  • 4
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    Distribution, abundance and species composition of phytoplankton in the South China Sea, Area I: Gulf of Thailand and east coast of Peninsular Malaysia (2021)
    Training Department, Southeast Asian Fisheries Development Center | Samut Prakan, Thailand
    In:  http://aquaticcommons.org/id/eprint/26338 | 23782 | 2019-03-22 03:10:47 | 26338 | Southeast Asian Fisheries Development Center, Training Department
    Details
    Publication Date: 2021-09-24
    Description: Phytoplankton samples were collected from 81 stations in the Gulf of Thailand and the east coast of Peninsular Malaysia during pre-northeast monsoon season (4 Sept. - 4 Oct. 1995) and the post-northeast monsoon season (23 Apr. - 23 May 1996). Two hundred and sixty taxa, composed of 2 species of blue green alga, 133 species of diatoms and 107 species of dinoflagellates, were identified. One species of blue green algae and 17 species of diatoms dominated the population in the study area. The dominant species most frequently found were Oscillatoria erythraea, Thalassionema frauenfeldii, Chaetoceros lorenzianus and C. compressus. The greatest phytoplankton bloom occurred by the highest cell density of Skeletonema costatum in the post-monsoon season near the end of Peninsular Malaysia. The toxic dinoflagellates were found with low cell densities. Species diversity indices (richness indices, diversity indices and evenness indices) were high in the coastal areas in the post-monsoon season.
    Keywords: Fisheries ; Algal blooms ; Dominant species ; Abundance ; Check lists ; Phytoplankton ; Chaetoceros lorenzianus ; Skeletonema costatum ; Thalassionema frauenfeldii ; Chaetoceros compressus ; Oscillatoria erythraea ; South China Sea ; Gulf of Thailand ; Malaysia
    Repository Name: AquaDocs
    Type: book_section
    Format: application/pdf
    Format: application/pdf
    Format: 111-134
    Format: 24
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