Importance of the Viral Shunt in Nitrogen Cycling in Synechococcus Spp. Growth in Subtropical Western Pacific Coastal Waters

Tsai, An‐Yi; Gong, Gwo‐Ching; Huang, Yu-Wen

doi:10.3319/tao.2014.06.11.01(oc)

Cited by 7 publications

(8 citation statements)

References 37 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In our previous study, we observed that viruses significantly affect the nutrient regeneration, and enhanced the growth rates in Synechococcus during the daytime in the subtropical western Pacific coastal waters [27]. Data from the previous studies indicated that viral-induced ammonium regeneration resulted in increased growth of Synechococcus [28,29]. The abovementioned results could explain the meager increase in the growth rates of Synechococcus in the nutrient-enriched bottles in this study.…”

Section: Discussionsupporting

confidence: 67%

Response of Growth and Grazing Rate of Nanoflagellates on Synechococcus spp. to Experimental Nutrient Enrichment

Tsai

Mukhanov

2021

Water

Self Cite

View full text Add to dashboard Cite

As important bacterivores in planktonic food webs, mixotrophic nanoflagellates cancause mortality in marine Synechococcus spp. Our previous study found that the pigmented nanoflagellate (PNF) has a significant grazing impact on Synechococcus spp. In the current study, we applied the dilution approach to test the growth and grazing rates of nanoflagellates on Synechococcus spp. We then compared the differences between experimental nutrient additions and in situ conditions in the coastal waters of the East China Sea during the summer season from July to September. The growth rates of Synechococcus spp. in the ambient environment were between 0.54 and 0.62 day−1, which were slightly higher than the 0.56 and 0.66 day−1 with nutrient enrichment in summer. In contrast, our nutrient enrichment experiments produced a marked decline approximately from 21% to 58%in the nanoflagellate grazing rate on Synechococcus spp. The reason was that the mixotrophic PNFs directly used the added nutrients and reduced their supply of nutrients from prey during the incubation experiments.

show abstract

Section: Discussionsupporting

confidence: 67%

Response of Growth and Grazing Rate of Nanoflagellates on Synechococcus spp. to Experimental Nutrient Enrichment

Tsai

Mukhanov

2021

Water

Self Cite

View full text Add to dashboard Cite

show abstract

“…may depend on locally recycled nutrients and a similar study found that viral-induced ammonium regeneration resulted in an increased growth as well as the proportion of dividing Synechococcus spp. cells in the warmer seasons [33]. The above results could explain why Synechococcus spp.…”

Section: Seasonal Dynamics Of Synechococcus Spp and Picoeukaryotic Ab...mentioning

confidence: 79%

Annual Cycle of the Synechococcus spp. and Picoeukaryotic Growth and Loss Rates in a Subtropical Coastal Ecosystem

Gong

Mukhanov

et al. 2022

Diversity

Self Cite

View full text Add to dashboard Cite

Seasonal variations in the picophytoplankton community structure (Synechococcus spp. and picoeukaryotes) were studied by flow cytometry in the coastal ecosystem of the subtropical western Pacific from October 2019 to September 2020. Synechococcus spp. was dominant in abundance during the study period, with its density ranging from 0.05 to 5.6 × 104 cells mL−1; its maximum occurred in July 2020. Picoeukaryotes were less abundant, with their density ranging from 0.2 to 13.6 × 103 cells mL−1. Their highest abundance was recorded in January 2020. The growth rates of Synechococcus spp. and picoeukaryotes ranged from −0.39 to 1.42 d−1 and 0.38 to 2.46 d−1, respectively, throughout the study period. Overall, the growth rate of the picoeukaryotes was significantly higher than that of Synechococcus spp. It is interesting to note that the grazing mortality of Synechococcus spp. and picoeukaryotes during the warmer period (April to September) was relatively low. Based on this study, we suggest that mixotrophic nanoflagellates lowered their feeding activity that obtained nutrients from prey and instead used additional nutrients during the incubation experiments. Our study demonstrated that a shift in the picophytoplankton community composition and grazing activity of predacious nanoflagellates in cold and warm periods can impact on the seasonal dynamics of the microbial food web.

show abstract

“…displayed higher proportion of dividing Synechococcus spp. cells (FDC) in virus existing treatment than that in the virus-reduced treatment (37% vs. 5%) (Tsai et al 2014).…”

Section: Resultsmentioning

confidence: 96%

Effects of bacteria-virus interaction on Synechococcus spp. growth in the coastal waters

Tsai¹

2020

Terr. Atmos. Ocean. Sci.

Self Cite

View full text Add to dashboard Cite

This study aims to investigate the relative importance of nanoflagellate grazing and viral lysis for heterotrophic bacteria and Synechococcus spp. mortality in coastal waters of the north-eastern Taiwan. The results showed that viral lysis and nanoflagellate grazing are the main factors responsible for the mortality of heterotrophic bacteria, however, the presence of viruses had a positive effect on the Synechococcus spp. growth. Moreover, this study observed different growth responses between heterotrophic bacteria and Synechococcus spp. population by using the modified dilution approach. The results also showed that there was lower net growth rate of Synechococcus spp. in 30 kDa dilution series than that observed in 0.2 μm series. Furthermore, based on the results obtained from modified dilution approach, we can estimate that about 12.8 ng N L -1 h -1 and 2.8 ng P L -1 h -1 was released by nanoflagellate grazing. In addition, this study estimated that, during the process of viral lysis, locally recycled nutrients released about 224 ng N L -1 h -1 and 24.9 ng P L -1 h -1 in this system. Our findings suggest that due to viral lysis, substantial portion of the recycled nutrients required for Synechococcus spp. growth was supplied sufficiently, emphasizing the importance of the viral shunt, especially in oligotrophic regions.

show abstract

Importance of the Viral Shunt in Nitrogen Cycling in Synechococcus Spp. Growth in Subtropical Western Pacific Coastal Waters

Cited by 7 publications

References 37 publications

Response of Growth and Grazing Rate of Nanoflagellates on Synechococcus spp. to Experimental Nutrient Enrichment

Response of Growth and Grazing Rate of Nanoflagellates on Synechococcus spp. to Experimental Nutrient Enrichment

Annual Cycle of the Synechococcus spp. and Picoeukaryotic Growth and Loss Rates in a Subtropical Coastal Ecosystem

Effects of bacteria-virus interaction on Synechococcus spp. growth in the coastal waters

Contact Info

Product

Resources

About