Effects of warming on microbial communities in the coastal waters of temperate and subtropical zones in the Northern Hemisphere, with a focus on Gammaproteobacteria

Tuyet, Dao Thi Anh; Tanaka, Toshinari; Sohrin, Rumi; Hao, Do Manh; Nagaosa, Kazuyo; Kato, Kenji

doi:10.1007/s10872-014-0264-2

Cited by 8 publications

(5 citation statements)

References 41 publications

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“…Similar result was observed in a similar warming experiment by increasing the temperature up to five degrees compare to the ambient temperature conducted in a fjord in Norway ( Lara et al, 2013 ). However, this phenomenon did not show in the summer which is consistent with another study performed in a subtropical coastal water (Ha Long Bay in Viet Nam) where ambient temperature was around 30°C ( Tuyet et al, 2015 ). In addition to temperature, bacterial dynamics is considered to be affected by resource availability ( Murrell, 2003 ).…”

Section: Discussionsupporting

confidence: 90%

Effect of Warming on Growth, Grazing, and Community Composition of Free-Living Bacterioplankton in Subtropical Coastal Waters During Winter and Summer

Lee

et al. 2020

Front. Microbiol.

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Global warming is considered a major threat to marine ecosystems, which affects bacterioplankton activity, diversity, and community composition. However, few studies focus on the potential effects of warming on bacterioplankton in subtropical coastal waters in different seasons. Here we investigated the influences of warming on growth, grazing and community composition of bacterioplankton in Hong Kong coastal waters during winter and summer via 1-day incubation experiments. Our results revealed that without grazers, bacterioplankton displayed higher growth rate during summer compared to winter, while warming only significantly increased the growth rate of bacterioplankton in winter. Grazers with size <5 μm were major predators of bacterioplankton. Warming had little effect on grazing in summer but significantly enhanced grazing rates of >5 μm grazers in winter. In both seasons, warming had little influence on bacterial diversity and community composition. Nevertheless, in family and OTU levels, bacterioplankton had different responses to grazing and warming which may result from the selective grazing preference of predators and different temperature optima for bacterioplankton. Furthermore, the presence of >5 μm and <5 μm grazers would result in significant increase of some bacterial families under warming condition. Together, our results suggest that warming have direct impacts on bacterioplankton in subtropical coastal waters during winter and may thus affect global biogeochemical cycles.

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Section: Discussionsupporting

confidence: 90%

Effect of Warming on Growth, Grazing, and Community Composition of Free-Living Bacterioplankton in Subtropical Coastal Waters During Winter and Summer

Lee

et al. 2020

Front. Microbiol.

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“…We expected slower growth rates in the spring versus the summer based solely on temperature effects (60, 61). However, we did not expect SAR11 growth rates to be slower in the Chesapeake than in the Delaware.…”

Section: Discussionmentioning

confidence: 99%

Controls of SAR11 subclade abundance, diversity, and growth in two Mid-Atlantic estuaries

Campbell

Lim

Kirchman

2022

Preprint

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SAR11 is a dominant bacterial clade in marine oligotrophic ecosystems. SAR11 can also be dominant in estuarine systems, where they are not well-studied. We examined the effects of season, nutrient concentrations, and salinity in shaping SAR11 subclade abundance, diversity, function, and growth in two Mid-Atlantic estuaries, the Delaware and Chesapeake Bays. Using metagenome-assembled genomes, we identified twelve distinct genomospecies within the Ia, II, IIIa, and V subclades, which made up to 60% of the total bacterial community. The functional potential of all SAR11 genomospecies varied, especially in carbohydrate metabolism, transporters, and one-carbon metabolic pathways. Predicted growth rates, estimated by the Peak to Trough method, varied by season and genomospecies. SAR11 growth rates negatively correlated in the spring but positively correlated in the summer with chlorophyll a concentrations and bacterial production, as well as phosphate and ammonium concentrations. Genomospecies in Ia.1, IIIa.2, and IIIa.4 subclades had low growth rates, while genomospecies in Ia.3, Ia.5, Ia.6, II, and V subclades had higher and more variable growth rates that were positively correlated with phosphate concentrations and temperature. Growth rate variation between subclades was associated with carbohydrate metabolic gene repertoires, especially glycolysis and number of transporters. While total transcript to genome ratios generally mirrored growth rates, transcription of genes involved in phosphate and nitrogen transport were negatively associated with growth rates. These data suggest that SAR11 genomospecies abundance varies in these estuaries because of differences in growth rates and metabolic capacities and changes with environmental conditions.

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“…Rises in temperature can increase the abundance of prokaryotes of the natural communities by enhancing their growth rates [ 62 ]. The abundance of the phylum Firmicutes (5.52%) found in the reproductive stage is consistent with the abundance of this phylum commonly found in the rice fields [ 63 ].…”

Section: Discussionmentioning

confidence: 99%

Bacterial Community of the Rice Floodwater Using Cultivation-Independent Approaches

Pittol

Scully

Miller

et al. 2018

International Journal of Microbiology

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In agricultural systems, interactions between plants and microorganisms are important to maintaining production and profitability. In this study, bacterial communities in floodwaters of rice fields were monitored during the vegetative and reproductive stages of rice plant development using 16S amplicon sequencing. The study was conducted in the south of Brazil, during the crop years 2011/12 and 2012/13. Comparative analyses showed strong differences between the communities of floodwaters associated with the two developmental stages. During the vegetative stage, 1551 operational taxonomic units (OTUs) were detected, while less than half that number (603) were identified in the reproductive stage. The higher bacterial richness observed in floodwater collected during the vegetative stage may have been favored by the higher concentration of nutrients, such as potassium, due to rhizodeposition and fertilizer application. Eighteen bacterial phyla were identified in both samples. Both communities were dominated by Gammaproteobacteria. In the vegetative stage, Alphaproteobacteria and Betaproteobacteria were more abundant and, in contrast, Bacilli and Clostridia were the more dominant classes in the reproductive stage. The major bacterial taxa identified have been previously identified as important colonizers of rice fields. The richness and composition of bacterial communities over cultivation time may contribute to the sustainability of the crop.

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Effects of warming on microbial communities in the coastal waters of temperate and subtropical zones in the Northern Hemisphere, with a focus on Gammaproteobacteria

Cited by 8 publications

References 41 publications

Effect of Warming on Growth, Grazing, and Community Composition of Free-Living Bacterioplankton in Subtropical Coastal Waters During Winter and Summer

Effect of Warming on Growth, Grazing, and Community Composition of Free-Living Bacterioplankton in Subtropical Coastal Waters During Winter and Summer

Controls of SAR11 subclade abundance, diversity, and growth in two Mid-Atlantic estuaries

Bacterial Community of the Rice Floodwater Using Cultivation-Independent Approaches

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