Seasonal Mixing-Driven System in Estuarine–Coastal Zone Triggers an Ecological Shift in Bacterial Assemblages Involved in Phytoplankton-Derived DMSP Degradation

Han, Dukki; Kang, Hee Yoon; Kang, Chang‐Keun; Unno, Tatsuya; Hur, Hor‐Gil

doi:10.1007/s00248-019-01392-w

Cited by 6 publications

(27 citation statements)

References 45 publications

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“…This supports the classical concept of microbial biogeography (Martiny et al, 2006). Further, we found that microbial beta diversity was even better resolved by individual water masses, highlighting the importance of including oceanographic boundaries that limit cross-front dispersal (Hanson et al, 2012;Hernando-Morales et al, 2017;Wilkins et al, 2013a).…”

Section: Implications For Microbial Regionalitysupporting

confidence: 85%

Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the southern Indian Ocean and the Southern Ocean

et al. 2021

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Abstract. Biogeochemical cycling of carbon (C) and nitrogen (N) in the ocean depends on both the composition and activity of underlying biological communities and on abiotic factors. The Southern Ocean is encircled by a series of strong currents and fronts, providing a barrier to microbial dispersion into adjacent oligotrophic gyres. Our study region straddles the boundary between the nutrient-rich Southern Ocean and the adjacent oligotrophic gyre of the southern Indian Ocean, providing an ideal region to study changes in microbial productivity. Here, we measured the impact of C and N uptake on microbial community diversity, contextualized by hydrographic factors and local physico-chemical conditions across the Southern Ocean and southern Indian Ocean. We observed that contrasting physico-chemical characteristics led to unique microbial diversity patterns, with significant correlations between microbial alpha diversity and primary productivity (PP). However, we detected no link between specific PP (PP normalized by chlorophyll-a concentration) and microbial alpha and beta diversity. Prokaryotic alpha and beta diversity were correlated with biological N2 fixation, which is itself a prokaryotic process, and we detected measurable N2 fixation to 60∘ S. While regional water masses have distinct microbial genetic fingerprints in both the eukaryotic and prokaryotic fractions, PP and N2 fixation vary more gradually and regionally. This suggests that microbial phylogenetic diversity is more strongly bounded by physical oceanographic features, while microbial activity responds more to chemical factors. We conclude that concomitant assessments of microbial diversity and activity are central to understanding the dynamics and complex responses of microorganisms to a changing ocean environment.

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Section: Implications For Microbial Regionalitysupporting

confidence: 85%

Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the southern Indian Ocean and the Southern Ocean

et al. 2021

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“…Until now, no molecular studies had investigated DMSP production and cycling in estuarine environments. However, many studies have investigated DMSP catabolism via the analysis of microbial communities and their catabolic gene abundance, distribution and transcription in diverse marine samples (Howard et al ., 2008; Levine et al ., 2012; Kudo et al ., 2018; Liu et al ., 2018), including some focused on estuarine regions (Williams et al ., 2019; Han et al ., 2020).…”

Section: Discussionmentioning

confidence: 99%

“…It is also consistent with Han et al . (2020) who found dmdA to be more prominent in costal rather than less saline estuary samples from the Gwangyang bay in Korea Peninsula all year (Han et al ., 2020). Alteromonas , Roseovarius , Thiobacimonas and Marinobacter bacteria, predicted to make DMSP and be more abundant in the transition and seawater than the freshwater region, were likely important DMSP producers in the Estuary samples (Supporting Information Fig.…”

Section: Discussionmentioning

confidence: 99%

Spatiotemporal distribution of bacterial dimethylsulfoniopropionate producing and catabolic genes in the Changjiang Estuary

Sun

Liu

Tan

et al. 2021

Environmental Microbiology

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Summary The osmolyte dimethylsulfoniopropionate (DMSP) is produced in petagram amounts by marine microorganisms. Estuaries provide natural gradients in salinity and nutrients, factors known to regulate DMSP production; yet there have been no molecular studies of DMSP production and cycling across these gradients. Here, we study the abundance, distribution and transcription of key DMSP synthesis (e.g. dsyB and mmtN) and catabolic (e.g. dddP and dmdA) genes along the salinity gradient of the Changjiang Estuary. DMSP levels did not correlate with Chl a across the salinity gradient. In contrast, DMSP concentration, abundance of bacterial DMSP producers and their dsyB and mmtN transcripts were lowest in the freshwater samples and increased abruptly with salinity in the transitional and seawater samples. Metagenomics analysis suggests bacterial DMSP‐producers were more abundant than their algal equivalents and were more prominent in summer than winter samples. Bacterial DMSP catabolic genes and their transcripts followed the same trend of being greatly enhanced in transitional and seawater samples with higher DMSP levels than freshwater samples. DMSP cleavage was likely the dominant catabolic pathway, with DMSP lyase genes being ~4.3‐fold more abundant than the demethylase gene dmdA. This is an exemplar study for future research on microbial DMSP cycling in estuary environments.

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“…Gwangyang Bay (GB), a semi-enclosed estuary, forms the estuarine–coastal zone at the southern tip of the Korean Peninsula and is a suitable area to monitor the spatiotemporal variability of environmental heterogeneity in the estuarine–coastal zone 19 – 21 . Furthermore, a recent metabarcoding survey of GB revealed that water mass mixing shapes bacterial communities in the estuarine–coastal zone and provided valuable insights into bacterial contributions to phytoplankton-derived organic matter under seasonal variation and phylogenetic bacterial diversity at euphotic depths 16 . Although the previous GB survey by Han et al 16 improved our understanding of the phylogenetic structuring (phylogenetic over-dispersion or clustering) of bacterial communities in the estuarine–coastal zone, the ecological significance of eukaryotic communities and its comparison with that of prokaryotic communities remains unknown.…”

Section: Introductionmentioning

confidence: 99%

“…Furthermore, a recent metabarcoding survey of GB revealed that water mass mixing shapes bacterial communities in the estuarine–coastal zone and provided valuable insights into bacterial contributions to phytoplankton-derived organic matter under seasonal variation and phylogenetic bacterial diversity at euphotic depths 16 . Although the previous GB survey by Han et al 16 improved our understanding of the phylogenetic structuring (phylogenetic over-dispersion or clustering) of bacterial communities in the estuarine–coastal zone, the ecological significance of eukaryotic communities and its comparison with that of prokaryotic communities remains unknown. However, considering the preliminary findings of Han et al 16 , GB may provide fundamental information regarding the phylogenetic responses of microbial (prokaryotic and eukaryotic) communities to the seasonal climate change in the estuarine–coastal zone.…”

Section: Introductionmentioning

confidence: 99%

Phylogenetic diversity and spatiotemporal dynamics of bacterial and microeukaryotic plankton communities in Gwangyang Bay of the Korean Peninsula

Han

Shin

Lee

et al. 2022

Sci Rep

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Nutrient dynamics function globally, flowing from rivers to the ocean (estuarine–coastal zone), and are vulnerable to climate change. Microbial habitats can be affected by marine nutrient dynamics and may provide a clue to predict microbial responses to environmental heterogeneity in estuarine–coastal zones. We surveyed surface seawater in Gwangyang Bay, a semi-enclosed estuary in Korea, from 2016 to 2018 using a metabarcoding approach with prokaryotic 16S and eukaryotic 18S rRNA genes. Bacterial and microeukaryotic communities in these waters showed distinct local communities in response to environmental heterogeneity and community transition at spatiotemporal scales in the estuarine–coastal zone. The relative abundance of prokaryotic and eukaryotic operational taxonomic units suggested a microbial trophic interaction in the Gwangyang Bay waters. We found that the community assembly process in prokaryotic communities was primarily influenced by biological interaction (immigration–emigration), whereas that in eukaryotic communities was more affected by environmental stress (habitat specificity) rather than by biotic factors. Our findings in the Gwangyang Bay waters may provide information on underlying (biotic or abiotic) factors of the assembly process in microbial communities in the estuarine–coastal zone.

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Seasonal Mixing-Driven System in Estuarine–Coastal Zone Triggers an Ecological Shift in Bacterial Assemblages Involved in Phytoplankton-Derived DMSP Degradation

Cited by 6 publications

References 45 publications

Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the southern Indian Ocean and the Southern Ocean

Hydrographic fronts shape productivity, nitrogen fixation, and microbial community composition in the southern Indian Ocean and the Southern Ocean

Spatiotemporal distribution of bacterial dimethylsulfoniopropionate producing and catabolic genes in the Changjiang Estuary

Phylogenetic diversity and spatiotemporal dynamics of bacterial and microeukaryotic plankton communities in Gwangyang Bay of the Korean Peninsula

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