Viral shunt in tropical oligotrophic ocean

Shiah, Fuh‐Kwo; Lai, Chien-Jen; Chen, Tzong-Yueh; Ko, Chia‐Ying; Tai, Jung-Hsiang; Chang, Chun‐Wei

doi:10.1126/sciadv.abo2829

Cited by 13 publications

(2 citation statements)

References 38 publications

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“…Thus, higher microbial abundances (VA and BA) and production (BP) were observed at S1, compared with those at S2 and S3 (Figures 3 and 5). VA, BA and BP in our study were comparable to the previous reports in the study area (Shiah et al., 2022; Xu et al., 2018).…”

Section: Discussionsupporting

confidence: 92%

“…The river discharge delivered nutrients and triggered phytoplankton growth in the nearshore waters (e.g., S1) (Xu et al., 2018), potentially enhancing the supply of phytoplankton‐derived and high‐molecular‐weight DOC (Kirchman, 2002), which bacteria preferentially utilize (Shi et al., 2019; Xu et al., 2018). The offshore station S2 and S3 located at substrate‐low SCS, where low molecular weight DOC and less bioavailable bacteria and virus‐derived DOC were likely dominated (Dong et al., 2013; Shiah et al., 2022). It is reported that a majority of high molecular‐weight DOC is relatively bioavailable to heterotrophic bacteria, while low molecular‐weight DOC is utilized at a higher energy cost (Benner & Amon, 2015; Stocker, 2012).…”

Section: Discussionmentioning

confidence: 99%

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Nutritional Status Regulates Bacteria‐Virus Interactions in the Northern South China Sea

Li,

He,

Shi

et al. 2023

JGR Biogeosciences

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Heterotrophic bacteria play a vital role in carbon cycle in oceans and viruses are an important regulator of bacterial metabolism and community composition. It remained unclear about how bacteria‐virus interactions varied with environmental conditions in oceans. In this study, bacterial metabolic activity and community composition were examined in three treatments with different viral pressure (control, virus‐rich and virus‐reduced) through bioassay experiments at three stations with different environmental conditions in the shelf of the northern South China Sea. Our results showed that bacteria‐virus interactions varied with environmental conditions. Viral lysis mediated bacterial growth rate and production by shaping bacterial community composition. Furthermore, viral lysis to less extent reduced bacterial growth rate and production in the substrate‐rich waters than substrate‐low waters. However, the opposite pattern occurred for viral regulation on bacterial respiration and carbon demand, likely since viral lysis dramatically mitigated the maintenance respiration of bacteria. Consequently, viral lysis to greater extent mitigated bacterial carbon processing in substrate‐rich environments than in substrate‐low environments. Our findings provided new insights into bacteria‐virus interactions, and improved our understanding of the role microbial processes in carbon cycling in oceans.

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Section: Discussionsupporting

confidence: 92%

Section: Discussionmentioning

confidence: 99%

Nutritional Status Regulates Bacteria‐Virus Interactions in the Northern South China Sea

Li,

He,

Shi

et al. 2023

JGR Biogeosciences

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Impact of Viruses on Prokaryotic Communities and Greenhouse Gas Emissions in Agricultural Soils

Huang,

Braga,

Ding

et al. 2024

Advanced Science

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Viruses are abundant and ubiquitous in soil, but their importance in modulating greenhouse gas (GHG) emissions in terrestrial ecosystems remains largely unknown. Here, various loads of viral communities are introduced into paddy soils with different fertilization histories via a reciprocal transplant approach to study the role of viruses in regulating greenhouse gas emissions and prokaryotic communities. The results showed that the addition of viruses has a strong impact on methane (CH4) and nitrous oxide (N2O) emissions and, to a minor extent, carbon dioxide (CO2) emissions, along with dissolved carbon and nitrogen pools, depending on soil fertilization history. The addition of a high viral load resulted in a decrease in microbial biomass carbon (MBC) by 31.4%, with changes in the relative abundance of 16.6% of dominant amplicon sequence variants (ASVs) in comparison to control treatments. More specifically, large effects of viral pressure are observed on some specific microbial communities with decreased relative abundance of prokaryotes that dissimilate sulfur compounds and increased relative abundance of Nanoarchaea. Structural equation modeling further highlighted the differential direct and indirect effects of viruses on CO2, N2O, and CH4 emissions. These findings underpin the understanding of the complex microbe‐virus interactions and advance current knowledge on soil virus ecology.

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Substrate availability may limit the response of tropical bacterioplankton biomass to warming

Morán,

Calleja,

Baltar

et al. 2024

Limnology & Oceanography

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The response of heterotrophic bacterioplankton to the addition of macrophytic dissolved organic matter (DOM) and temperature was investigated in the Red Sea. We added 40 μmol C L−1 of leachates obtained from seagrass and mangrove leaves to natural bacterial communities, incubated them at three temperatures (25.5°C found in situ plus 3°C below and above that value) and monitored the microbial and biogeochemical responses over 4 d. Seagrass and mangrove DOM, important allochthonous sources in tropical oligotrophic regions, had distinct chemical characteristics compared to unamended seawater, with mangrove substrates containing comparatively more nitrogen and protein‐like fluorescent DOM than seagrass. Specific growth rates (μ) increased twofold in the seagrass and mangrove treatments (1.0 and 0.8 d−1, respectively) relative to the seawater control (0.4 d−1). The biomass of heterotrophic bacteria generally reflected μ changes, reaching maximum values of 16.8 and 17.3 μg C L−1 in the seagrass and mangrove treatments, respectively, compared to just 2.6 μg C L−1 in seawater. The increase in μ values due to experimental warming followed the metabolic theory of ecology, mostly because of enhanced exoenzymatic activity, while cell size decreased as predicted by the temperature–size rule (mean −3% per °C increase). Although the labile nature of the specific seagrass and mangrove DOM leachates was clearly demonstrated, we conclude that tropical heterotrophic bacteria may have limited capability to increase their biomass as a consequence of future warming, even in the presence of high loadings of macrophytic DOM.

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Viral shunt in tropical oligotrophic ocean

Cited by 13 publications

References 38 publications

Nutritional Status Regulates Bacteria‐Virus Interactions in the Northern South China Sea

Nutritional Status Regulates Bacteria‐Virus Interactions in the Northern South China Sea

Impact of Viruses on Prokaryotic Communities and Greenhouse Gas Emissions in Agricultural Soils

Substrate availability may limit the response of tropical bacterioplankton biomass to warming

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