Microbial dynamics in an oligotrophic bay of the western subtropical Pacific: Impact of short-term heavy freshwater runoff and upwelling |
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| Authors: | An-Yi Tsai Gwo-Ching Gong Robert W Sanders Chien-Fu Chao Kuo-Ping Chiang |
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| Institution: | 1.Institute of Marine Environmental Chemistry and Ecology,National Taiwan Ocean University,Keelung,Taiwan, Republic of China;2.Biology Department, Temple University,Philadelphia,USA;3.Institute of Environmental Biology and Fishery Science,National Taiwan Ocean University,Keelung,Taiwan, Republic of China |
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| Abstract: | This two-year study investigates the possible factors that determine spatial and temporal dynamics of picoplankton (heterotrophic
bacteria, autotrophic picoplankton—Synechococcus spp., Prochlorococcus, and picoeukaryotes) and nanoflagellate abundance in the subtropical Ilan Bay, Taiwan, where the inner bay is affected by
freshwater run-off from the Lanyang River and the eastern outer bay by the Kuroshio Current. In the inner bay, there was more
rain and freshwater discharge in 2005 than in 2004 during the warm season (>24° C, June–September). The abundance of bacteria,
Synechococcus spp., Prochlorococcus, and picoeukaryotes and the percentage contributions of pigmented nanoflagellate (PNF %) were two- to eight-fold greater
during this period (July in 2005) than for other sampling periods. Relatively low abundance of heterotrophic nanoflagellates
(HNF) in the presence of abundant picoplankton prey suggests that top-down control determined HNF abundance in the Ilan Bay,
Taiwan. |
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