2020
DOI: 10.3390/jmse8020076
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Changes in Bacterial Communities in Seawater-Flooded Soil in the Four Years After the 2011 Tohoku Tsunami in Japan

Abstract: The 2011 Tohoku tsunami had a serious impact, such as an increase in harmful substances and salinity over a large area. Herein, we evaluated transitions in bacterial communities in agricultural fields in the four years after the 2011 Tohoku tsunami. Bacterial communities were compared across four different types of soil—unflooded field (UF) soil, soil flooded for a short term (ST), soil flooded for the long term (LT), soil flooded long term and cultivated fields (LTC), and marine environmental materials (bay s… Show more

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Cited by 3 publications
(5 citation statements)
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“…This result possibly suggests that microorganisms with the capacity to tolerate a broad range of environmental conditions increased in relative abundance after the pulse disturbance of the overwash as opposed to "habitat specialists" 55 , that would have found themselves at a competitive disadvantage. Our finding is in line with other tsunami microbial studies (Table 1) who report microbial community changed before and after a tsunami inundation event, and these community changes after the flooding disturbance remained up to 10 years after the event 21 .…”
Section: Do Microbial Communities Differ Between the Respective Study Sites And Samples?supporting
confidence: 93%
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“…This result possibly suggests that microorganisms with the capacity to tolerate a broad range of environmental conditions increased in relative abundance after the pulse disturbance of the overwash as opposed to "habitat specialists" 55 , that would have found themselves at a competitive disadvantage. Our finding is in line with other tsunami microbial studies (Table 1) who report microbial community changed before and after a tsunami inundation event, and these community changes after the flooding disturbance remained up to 10 years after the event 21 .…”
Section: Do Microbial Communities Differ Between the Respective Study Sites And Samples?supporting
confidence: 93%
“…However, each technique has inherent limitations. For example, grain size analysis can be inconclusive 9,16 ; microfossils such as diatoms, foraminifera, and ostracods may only be preserved for a relatively short time in tropical settings as compared to temperate locations [17][18][19] ; and chemical elemental signals present in the geological record might be misleading if they have been modified or removed by natural processes such as precipitation 20 and microbial activities 21 , or if the elemental sources are ambiguous 16 . In addition, compiling multiple proxies might not unequivocally show that deposits were laid down by overwash processes 22 .…”
mentioning
confidence: 99%
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“…After removing singletons (OTUs consisting of a maximum of one sequence read), 99.96% of the sequence reads in 18 soil samples were classified as bacteria and assigned to 44 phyla, 110 classes, 198 orders, 279 families, 646 genera, and 659 species. In general, the dominant phyla in the soil bacterial communities were Proteobacteria, Acidobacteria, Actinobacteria, Verrucomicrobia, Bacteroides, Chloroflexi, Planctomycetes, and Gemmatimonadetes ( Asano et al., 2020 ; Janssen, 2006 ). Table S1 showed the top 3 abundant bacterial phyla in our study, and the ranked order of the predominant phyla was Firmicutes (59.8%), followed by Proteobacteria (21.34%), Actinobacteria (6.27%), Bacteroidetes (4.21%), Chloroflexi (3.31%), Verrucomicrobia (1.12%), Spirochaetes (0.80%), Acidobacteria (0.67%), Planctomycetes (0.54%), Nitrospirae (0.47%), and Lentisphaerae (0.37%).…”
Section: Resultsmentioning
confidence: 99%