The distribution of phytoplankton community structure in the Sunda Shelf and the Strait of Malacca during spring intermonsoon

Wang Lei; Leng Xiaoyun; Sun Qingyang; Wang Dongxiao; Zhang Cuixia; Sun Jun

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Wang Lei, Leng Xiaoyun, Sun Qingyang, Wang Dongxiao, Zhang Cuixia, Sun Jun. The distribution of phytoplankton community structure in the Sunda Shelf and the Strait of Malacca during spring intermonsoon[J]. Haiyang Xuebao, 2015, 37(2): 120-129.

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The distribution of phytoplankton community structure in the Sunda Shelf and the Strait of Malacca during spring intermonsoon

1.
College of Marine Science & Engineering, Tianjin University of Science & Technology, Tianjin 300457, China;State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology Chinese Academy of Sciences, Guangzhou 510301, China
2.
College of Marine Science & Engineering, Tianjin University of Science & Technology, Tianjin 300457, China
3.
State Key Laboratory of Tropical Oceanography, South China Sea Institute of Oceanology Chinese Academy of Sciences, Guangzhou 510301, China

Received Date: 2014-04-11
Rev Recd Date: 2014-06-18

Abstract

Abstract

Surface water samples were collected in order to study the spatial distribution of phytoplankton community in the Sunda Shelf and the Strait of Malacca during March and May 2013. Significant spatial variations of phytoplankton total Chl a(TChl a) biomass and community structure were observed using the photosynthetic pigments method. The TChl a biomass was low to some extent in the Sunda Shelf during the intermonsoon season, when and where the minimum value was only 0.014 μg/L at Sta. SS4 in the Java Sea, and the average was (0.083±0.043) μg/L in the Sunda Shelf. The picophytoplankton dominated in the Sunda Shelf and contributed more than 80% of the total biomass. The salinity gradient was distinct along the Strait of Malacca from northwest to the southeast. And the lowest salinity appeared at Sta. SM5 with the highest TChl a concentration (1.080 μg/L), which was outstanding from the average value of all the strait stations . The Synechococcus dominated 60%-80% of the total phytoplankton biomass at the stations in the Sunda Shelf and SM1-SM4. Even though the TChl a concentrations was less than it at Sta. SM5, they were still apparently higher at Sta. SM6 and SM7 than the biomass at the other stations. And the Diatoms contributed more than 20% at these two stations as a result of the higher nutrient concentration carrying by the river runoff, especially for phosphate and silicate. On the contrary, the superiority of Synechococcus might be weakened by the intrusion of low-salinity, high-nutrients water.
- phytoplankton,
- community structure,
- Sunda Shelf,
- Strait of Malacca

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