Spatial distribution of viruses, bacteria and chlorophyll in the northern South China Sea

He, Lei; Yin, Kedong; Yuan, Xiangcheng; Li, Dongmei; Zhang, Derong; Harrison, Paul J.

doi:10.3354/ame01263

Cited by 37 publications

(17 citation statements)

References 45 publications

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“…During the same cruise, He et al (2009) observed that upwelled cold and saline water was present at Stn E001 and downwelling was present at Stn E105. In our study, UVR inhibition of PP at Stn E001 was higher than that at Stn E105 (t = 3.1, df = 4, p < 0.05) even though the inhibition of PP was normalized in terms of UVR dose (data not shown).…”

Section: Factors Regulating Uvr Effectsmentioning

confidence: 89%

“…Both phytoplankton and bacteria were also strongly inhibited by UVR at Stn E001 (Fig. 6A,B), where N:P ratio was > 30:1 as reported by He et al (2009). Further studies are needed to determine if the dual stress of UVR and P-limitation near the Pearl River estuary makes the bacteria and phytoplankton less resistant to UVR effects (Fig.…”

Section: Factors Regulating Uvr Effectsmentioning

confidence: 99%

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Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Yuan¹,

Yin²,

Harrison³

et al. 2011

Aquat. Microb. Ecol.

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In late summer of 2005, the effects of ultraviolet radiation (UVR) on primary production (PP), bacterial production (BP) and viral decay rates (VDR) were investigated along a salinity gradient in the northern South China Sea. The freshwater input increased the UVA diffuse attenuation coefficient (up to 2.7 m −1 ) near the Pearl River estuary and consequently influenced the UVR inhibitory effects, as VDR was significantly correlated with the UVA diffuse attenuation coefficient. UVR inhibition of PP was significantly higher in upwelled waters than downwelled waters, suggesting that the vertical mixing (i.e. upwelling and downwelling) was an important factor regulating microbial sensitivity to UVR. UVR inhibited PP and BP by ~15 and 25%, respectively, and the UVR inhibition of BP was significantly higher than that of PP in most of the samples; hence there was a competitive advantage for phytoplankton over bacteria under the relatively high UVR exposure. UVR increased VDR by ~30%, which decreased bacterial mortality by 0.12 to 0.3% h −1 and mitigated the inhibitory effects of UVR on bacteria. In general, phytoplankton were more tolerant than bacteria and viruses to UVR in the sub-tropical northern South China Sea.

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Section: Factors Regulating Uvr Effectsmentioning

confidence: 89%

Section: Factors Regulating Uvr Effectsmentioning

confidence: 99%

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Yuan¹,

Yin²,

Harrison³

et al. 2011

Aquat. Microb. Ecol.

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“…Previous studies on viral distributions revealed positive correlations with bacterioplankton (Wommack and Colwell, 2000;Hewson et al, 2001) and with chlorophyll (Maranger and Bird, 1995). Some studies also showed higher viral counts with higher trophic states (Cochlan et al, 1993;He et al, 2009), but several works found no direct link between virioplankton abundance and trophic conditions .…”

Section: Introductionmentioning

confidence: 93%

“…Investigations into the spatial distribution of prokaryotes and virioplankton have been conducted in various ecosystems (Wommack and Colwell, 2000;Clasen et al, 2008), as well as in the Pearl River Estuary (He et al, 2009). In terms of picoplankton in this estuary, the distribution is becoming increasingly well understood (Qiu et al, 2010;Lin et al, 2010;Zhang et al, 2013).…”

Section: Introductionmentioning

confidence: 99%

Picoplankton and virioplankton abundance and community structure in Pearl River Estuary and Daya Bay, South China

Huang

Zhang

2015

Journal of Environmental Sciences

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“…It is generally observed that the virus-to-prokaryote ratio (VPR) increases with increasing environmental nutri-15 ents (Weinbauer et al, 1993). However, this trend seems not to hold in estuaries (Jiao et al, 2006;He et al, 2009). Estuaries usually harbor mixed viral communities that are composed of autochthonous viruses and allochthonous viruses from both river water and seawater.…”

mentioning

confidence: 99%

Perspectives of the microbial carbon pump with special references to microbial respiration and ecological efficiency

Dang¹,

Jiao²

2014

Preprint

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Abstract. Although respiration consumes fixed carbon and produce CO2, it provides energy for essential biological processes of an ecosystem, including the microbial carbon pump (MCP). In MCP-driving biotransformation of labile DOC to recalcitrant DOC (RDOC), microbial respiration provides the metabolic energy for environmental organic substrate sensing, cellular enzyme syntheses and catalytic processes such as uptake, secretion, modification, fixation and storage of carbon compounds. The MCP efficiency of a heterotrophic microorganism is thus related to its energy production efficiency and hence to its respiration efficiency. Anaerobically respiring microbes usually have lower energy production efficiency and lower energy-dependent carbon transformation efficiency, and consequently lower MCP efficiency at per cell level. This effect is masked by the phenomena that anoxic environments often store more organic matter. Here we point out that organic carbon preservation and RDOC production is different in mechanisms, and anaerobically respiring ecosystems could also have lower MCP ecological efficiency. Typical cases can be found in large river estuarine ecosystems. Due to strong terrigenous input of nutrients and organic matter, estuarine ecosystems usually experience intense heterotrophic respiration processes that rapidly consume dissolved oxygen, potentially producing hypoxic and anoxic zones in the water column. The lowered availability of dissolved oxygen and the excessive supply of nutrients such as nitrate from river input prompt enhanced anaerobic respiration processes. Thus, some nutrients may be consumed by anaerobically respiring heterotrophic microorganisms, instead of being utilized by phytoplankton for carbon fixation and primary production. In this situation, the ecological functioning of the estuarine ecosystem is altered and the ecological efficiency is lowered, as less carbon is fixed and less energy is produced. Ultimately this would have negatively impacts on the ecological functioning and efficiency of the MCP which depends on both organic carbon and energy supply.

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Spatial distribution of viruses, bacteria and chlorophyll in the northern South China Sea

Cited by 37 publications

References 45 publications

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Picoplankton and virioplankton abundance and community structure in Pearl River Estuary and Daya Bay, South China

Perspectives of the microbial carbon pump with special references to microbial respiration and ecological efficiency

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Spatial distribution of viruses, bacteria and chlorophyll in the northern South China Sea

Cited by 37 publications

References 45 publications

Phytoplankton are more tolerant to UV than ­bacteria and viruses in the northern South China Sea

Phytoplankton are more tolerant to UV than ­bacteria and viruses in the northern South China Sea

Picoplankton and virioplankton abundance and community structure in Pearl River Estuary and Daya Bay, South China

Perspectives of the microbial carbon pump with special references to microbial respiration and ecological efficiency

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Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea

Phytoplankton are more tolerant to UV than bacteria and viruses in the northern South China Sea