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Phytoplankton Biomass and Production in Subtropical Hong Kong Waters: Influence of the Pearl River Outflow
Ho, AYT; Xu, J; Yin, KD; Jiang, YL; Yuan, XC; He, L; Anderson, DM; Lee, JHW; Harrison, PJ;
AbstractThe size-fractionated phytoplankton biomass and primary production were investigated in four contrasting areas of Hong Kong waters in 2006. Phytoplankton biomass and production varied seasonally in response to the influence of the Pearl River discharge. In the dry season, the phytoplankton biomass and production were low (<42 mg chl m(-2) and <1.8 g C m(-2)day(-1)) in all four areas, due to low temperatures and dilution and reduced light availability due to strong vertical mixing. In contrast, in the wet season, in the river-impacted western areas, the phytoplankton biomass and production increased greater than five-fold compared to the dry season, especially in summer. In summer, algal biomass was 15-fold higher than in winter, and the mean integrated primary productivity (IPP) was 9 g C m(-2)day(-1) in southern waters due to strong stratification, high temperatures, light availability, and nutrient input from the Pearl River estuary. However, in the highly flushed western waters, chl a and IPP were lower (<30 mg m(-2) and 4 g C m(-2)day(-1), respectively) due to dilution. The maximal algal biomass and primary production occurred in southern waters with strong stratification and less flushing. Spring blooms (> 10 mu g chlaL(-1)) rarely occurred despite the high chl-specific photosynthetic rate (mostly > 10 mu g C mu g chla(-1)day(-1)) as the accumulation of algal biomass was restricted by active physical processes (e.g., strong vertical mixing and freshwater dilution). Phytoplankton biomass and production were mostly dominated by the >5-mu m size fraction all year except in eastern waters during spring and mostly composed of fast-growing chain-forming diatoms. In the stratified southern waters in summer, the largest algal blooms occurred in part due to high nutrient inputs from the Pearl River estuary.
Department[Ho, Alvin Y. T.; Xu, Jie; Yin, Kedong; Jiang, Yuelu; Yuan, Xiangcheng; He, Lei; Harrison, Paul J.] Hong Kong Univ Sci & Technol, Atmospher Marine & Coastal Environm Program, Kowloon, Hong Kong, Peoples R China; [Yin, Kedong] Griffith Univ, Griffith Sch Environm, Australia Rivers Inst, Brisbane, Qld 4111, Australia; [Anderson, Donald M.] Woods Hole Oceanog Inst, Dept Biol, Woods Hole, MA 02543 USA; [Lee, Joseph H. W.] Univ Hong Kong, Dept Civil Engn, Hong Kong, Hong Kong, Peoples R China; [Yuan, Xiangcheng; He, Lei] CAS, LED, S China Sea Inst Oceanol, Guangzhou, Guangdong, Peoples R China
KeywordPhytoplankton Biomass Primary Production Pearl River Discharge Stratification Vertical Mixing Hong Kong
Subject AreaEnvironmental Sciences ; Marine & Freshwater Biology
Indexed Bysci
Funding ProjectLED
WOS IDWOS:000275420700015
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Document Type期刊论文
Recommended Citation
GB/T 7714
Ho, AYT,Xu, J,Yin, KD,et al. Phytoplankton Biomass and Production in Subtropical Hong Kong Waters: Influence of the Pearl River Outflow[J]. ESTUARIES AND COASTS,2010,33(1):170-181.
APA Ho, AYT.,Xu, J.,Yin, KD.,Jiang, YL.,Yuan, XC.,...& Biomass and Production in Subtropical Hong Kong Waters: Influence of the Pearl River Outflow.ESTUARIES AND COASTS,33(1),170-181.
MLA Ho, AYT,et al."Phytoplankton Biomass and Production in Subtropical Hong Kong Waters: Influence of the Pearl River Outflow".ESTUARIES AND COASTS 33.1(2010):170-181.
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