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About RCEC
Faculty/Staff
Research
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Shiah, Fuh-Kwo夏復國
Research Fellow and Deputy Director
Research Interests
My research lies in the fields of limnology and oceanography. I am interested in studying (1) the growth controlling mechanisms of planktons (heterotrophic bacterioplankton, phytoplankton, protozoan and viruses) and their eco-linkages in freshwater (the Fei-Tsuei reservoir) and marine (the East China Sea, South China Sea and the NW Pacific) ecosystems; (2) the planktonic and ecosystem responses (ratio of primary production to community respiration) to external physical and chemical (inorganic nutrients, organic substrate) forcing induced by episodic events such as typhoons, internal waves… etc., and (3) the operation and management of decadal time-series biogeochemical observatory studies including the SEATS project in the South China Sea and the T-WEBS project in Fei-Tsuei reservoir in northern Taiwan.
Representative Publications
Shiah FK and HW Ducklow. (1994). Temperature and substrate regulation of bacterial abundance, production and specific growth rate in temperate estuarine ecosystems. Mar. Ecol. Prog. Ser. 103: 297-308.
Shiah FK and HW Ducklow. (1994a). Temperature regulation of heterotrophic bacterioplankton biomass, production and specific growth rate in the Chesapeake Bay. Limnol. Oceanogr. 39(6): 1243-1258.
Shiah FK and HW Ducklow. (1995). Multi-scale variability of bacterioplankton abundance, production and specific growth rate in a temperate salt marsh tidal creek. Limnol. Oceanogr. 40(1): 55-66.
Shiah FK and HW Ducklow. (1995a). Regulation of bacterioplankton abundance and growth rate by substrate supply and bacterivory: a mesocosm study. Microb. Ecol. 30: 239-255.
Shiah FK and HW Ducklow. (1997). Bacterioplankton growth responses to temperature and chlorophyll variations in estuaries measured by thymidine:leucine incorporation ratio. Aquat. Microb. Ecol. 13: 151-159.
Tseng YF, TC Hsu, YL Chen, SJ Kao, JT Wu, JC Lu, JC Lai, HY Kuo, CH Lin, Y. Yamamoto, T. Xiao and FK Shiah*.(2010). Typhoon effects on DOC dynamics in a phosphate-limited reservoir. Aquat. Microb. Ecol. 60:247-260. doi: 10.3354.
Lai CC, YW Fu, HB Liu, HY Kuo, KW Wang, CH Lin, JH Tai, GTF Wong, KY Lee, TY Chen, Y Yamamoto, MF Chow, Y Kobayashi, CY Ko and FK Shiah*. (2014). Distinct bacterial production–DOC–primary production relationships and implications for biogenic C cycling in the South China Sea shelf. Biogeosciences, 11:1-10. Doi:10.5194/bg-11-12014.
Ko CY, CC Lai, TY Chen, HH Hsu and FK Shiah*. (2015). Typhoon effects on phytoplankton responses in a semi-closed freshwater ecosystem. Marine and Freshwater Research. http://dx.doi.org/10.1071 /MF14294.
Chen TY, JH Tai, CY Ko, CC Chen, CH Hsieh, NZ Jiao, HB Liu and FK Shiah*. (2016). Nutrient pulses driven by internal solitary waves enhance heterotrophic bacteria growth in the South China Sea. Environmental Microbiology. DOI: 10.1111/1462-2920.13273.
Ko CY, CC Lai, HH Hsu, FK Shiah*. (2017). Decadal phytoplankton dynamics in response to episodic climatic disturbances in a subtropical deep freshwater ecosystem. Water Research 109: 102-113.
Highlights
Phytoplankton response to episodic climatic disturbances in freshwater ecosystem: a decadal analysis Episodic climatic disturbances are projected to have intense magnitude and inconsistent frequency under 21st century climate change. Through field observations of a total 36 typhoon cases in a subtropical deep freshwater ecosystem in the period of 2005-2014. Phytoplankton exposed to typhoon disturbances generally exhibited an increasing trend over the weeks before, during and after typhoons in summer but varied in autumn. The correlations and multivariate regressions showed different contributions of meteorological and hydrological variables to individual phytoplankton responses before, during and after typhoons between seasons. The factors that may affect phytoplankton response included amount of precipitation, input of tributary suspended matter, anoxic condition in the deep water and the strength of the mixed layer-depth. For the first time, multiple typhoons impacts over decadal time-scale has been reported by our study. Reference: Kao et al., 2017.
Internal solitary waves enhance bacteria growth in the South China Sea Internal waves are high frequency waves generated during tidal movement. Inorganic nutrients in deep-water can be brought to the surface by internal waves in shallow area(bottom-depths <100m), and then fuel the growth of planktons in there. Nine anchored studies were conducted from 2009~2012 in the South China Sea with different physical conditions. For the first time, our results indicated that the maxima of bacterial production and growth rate of the elevation IWs areas were ~5-folds higher than those of the Control sites. Surveys conducted at the NW area of the Dongsha atoll suggested that bacterial activities may be a function of the lunar fortnightly (14-day) cycle. Enrichment experiments suggested more directly that the limiting inorganic nutrients introduced by the elevation IWs may contribute higher bacterial activities within the euphotic zone. Reference: Chen et al., 2016..
