AME 66:159-167 (2012)  -  DOI: https://doi.org/10.3354/ame01566

Viral lysis and nanoflagellate grazing as factors controlling diel variations of Synechococcus spp. summer abundance in coastal waters of Taiwan

An-Yi Tsai1,*, Gwo-Ching Gong1,2, Robert W. Sanders3, Kuo-Ping Chiang1, Jun-Kai Huang1, Ya-Fan Chan4

1Institute of Marine Environmental Chemistry and Ecology, and 2Center of Excellence for Marine Bioenvironment and Biotechnology, National Taiwan Ocean University, Keelung 202-24, Taiwan ROC
3Department of Biology, Temple University, Philadelphia, Pennsylvania 19122, USA
4Institute of Marine Biology, National Taiwan Ocean University, Keelung 202-24, Taiwan, ROC

ABSTRACT: Diel variations in the protozoan grazing and viral-mediated mortality of Synechococcus spp. were simultaneously estimated using a modified dilution method in the coastal waters off Taiwan during 4 cruises in summer 2011. During the study period, the abundance of Synechococcus spp. showed a clear diel cycle and ranged from 1.2 × 104 cells ml−1 at 08:00 h to 9.8 × 104 cells ml−1 at midnight. The frequency of dividing cell (FDC) values were highest between afternoon and dusk and decreased to <10% between 20:00 and 08:00 h. Synechococcus spp. specific growth rates varied during the experimental period from 0.025 to 0.033 h−1 and 0.050 to 0.085 h−1 at daytime and nighttime, respectively. Rates of Synechococcus spp. mortality due to nanoflagellate grazing averaged 0.031 h−1 during daytime and 0.041 h−1 at night. The estimated mortality due to viral lysis was between 0.011 and 0.019 h−1 during daytime and between 0.026 and 0.065 h−1 at night. Nanoflagellate grazing was the dominant cause of Synechococcus spp. mortality during daytime; however, mortality from viral lysis and nanoflagellate grazing was more balanced at night.


KEY WORDS: Synechococcus spp. · Modified dilution method · Viruses · Nanoflagellates


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Cite this article as: Tsai AY, Gong GC, Sanders RW, Chiang KP, Huang JK, Chan YF (2012) Viral lysis and nanoflagellate grazing as factors controlling diel variations of Synechococcus spp. summer abundance in coastal waters of Taiwan. Aquat Microb Ecol 66:159-167. https://doi.org/10.3354/ame01566

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