Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model

Miki, Takeshi; Yokokawa, Taichi; Nagata, Toshi; Yamamura, Norio

doi:10.3354/meps07597

Cited by 18 publications

(10 citation statements)

References 49 publications

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“…The above results on transient dynamics lend support to the concept that immigration of prokaryotes, represented by the vertical mixing in our model, facilitates the shift in local community composition during environmental changes, recently proposed via a mainland-island metacommunity model (Miki et al 2008). Our study here suggests two directions of empirical work that might validate our hypothesis that vertical mixing "seeds" ecotypes with higher preference for POC from the deep to the surface layer, affecting the spatiotemporal dynamics of microbial communities.…”

Section: Discussionsupporting

confidence: 75%

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Vertically structured prokaryotic community can control the efficiency of the biological pump in the oceans

et al. 2009

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Despite recent advances in molecular and metagenomic approaches, it is still unclear how spatiotemporal variations in microbial communities influence the biological pump, exporting organic carbon from the surface to the deep oceans. We address this important problem by constructing a simple model of a prokaryotic metacommunity in which two generalist ecotypes compete for two resources. The first and the second ecotypes have, respectively, a higher preference for particulate organic carbon (POC) and dissolved organic carbon. Sinking of POC would lead to a higher abundance of the first ecotype in the deep layer compared to the surface layer, but vertical mixing in turn generates a net upward flux of this ecotype to the surface layer. This upward movement accelerates the shifts in the community composition during the phytoplankton bloom, contributing to a higher efficiency in POC remineralization at the surface layer and reducing the carbon flux to the deep layer.

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Section: Discussionsupporting

confidence: 75%

“…These details and their effects have been accounted for in previous models (Miki and Yamamura 2005;Miki et al 2008). In those studies, the competitive dominance of ecotypes with higher preference for POC has been predicted to occur during phytoplankton blooms, justifying the simplification of microscopic interactions in our present model.…”

Section: Discussionmentioning

confidence: 89%

Vertically structured prokaryotic community can control the efficiency of the biological pump in the oceans

et al. 2009

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“…Natural bacterial assemblages consist of various subgroups in terms of ecological and biogeochemical features. The relationship between dynamics of bacterial community structure and variations in carbon cycling within the microbial loop are not well understood in natural aquatic systems, though the results of some ecological models suggest that changes in bacterial community structure can affect the carbon fluxes through bacterial communities (Miki et al 2008). Only limited attempts have so far been conducted to make simultaneous estimation of grazer-induced and virus-induced bacterial mortality for distinct bacterial groups (Šimek et al 2001; 2007).…”

Section: Introductionmentioning

confidence: 99%

Protistan grazing and viral lysis losses of bacterial carbon production in a large mesotrophic lake (Lake Biwa)

2014

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The grazing and lysis mortality of planktonic bacteria were estimated using the modified dilution method and respiratory quinone (RQ) analysis in mesotrophic Lake Biwa, Japan. The planktonic bacterial assemblages in the lake consisted of various RQs subgroups with different growth and mortality rates. The sum of total bacterial mortalities due to protistan grazing and viral lysis accounted for 96.6% (range; 89.0-107.2%) of daily total bacterial production. This is the first report which successfully demonstrates a balanced relationship between bacterial production and losses using the modified dilution method in a lake. The growth rates of ubiquinone (UQ)-containing bacteria were faster than those of menaquinone-containing bacteria. Especially, the dominant and fastest-growing bacterial groups in the present study were the bacterial groups containing UQ-8 or UQ-10. The sum of their production and loss accounted for 60% of carbon fluxes within the microbial loop. Thus, a large portion of the carbon cycling through the bacterial community in Lake Biwa can be explained by the carbon fluxes through dominant bacterial groups.

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“…The relation between microbially mediated biogeochemical transformation rates and the prokaryotic community composition is a central research topic in microbial ecology, linked to the function-stability debate (Miki et al 2008, Fuhrman 2009, Yokokawa & Nagata 2010. Examining distribution patterns of prokaryotes and environmental parameters over space and time is one of the approaches used to determine how prokaryotes relate to specific biogeochemical processes.…”

Section: Introductionmentioning

confidence: 99%

Spatial patterns of bacterial abundance, activity and community composition in relation to water masses in the eastern Mediterranean Sea

Yokokawa

Corte

Sintes

et al. 2010

Aquat. Microb. Ecol.

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To determine the variation of bacterial activity and community composition between and within specific water masses, samples were collected throughout the water column at 5 stations in the eastern Mediterranean Sea corresponding to the regions of the northern Aegean, mid-Aegean, western Cretan, Ionian and southern Aegean Seas. Prokaryotic abundance below 100 m declined with depth at all the stations, while decreasing trends with depth in prokaryotic heterotrophic activity were present only at 2 out of the 5 stations. Bacterial community composition (BCC), determined using both automated rRNA intergenic spacer analysis and terminal-restriction-fragment length polymorphism, was also related to depth although the number of operational taxonomic units was remarkably constant throughout the water column. Overall, the maximums in similarity values of the BCC between water sample pairs decreased with increasing temperature-salinity (T-S) distance of the water samples probably due to distinct biogeochemical characteristics of water masses. However, considerable dissimilarity in the BCC between samples with identical T-S values, and hence within the same water mass, was also observed, possibly reflecting heterogeneity in the organic matter field or in biotic control within a given water body. Thus, we conclude that the richness of bacterial communities is remarkably constant with depth down to bathypelagic waters. The similarity of bacterial communities in water parcels with identical temperature and salinity can range from highly similar to very dissimilar, reflecting variability in substrate supply despite the physical uniformity of water parcels.

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Immigration of prokaryotes to local environments enhances remineralization efficiency of sinking particles: a metacommunity model

Cited by 18 publications

References 49 publications

Vertically structured prokaryotic community can control the efficiency of the biological pump in the oceans

Vertically structured prokaryotic community can control the efficiency of the biological pump in the oceans

Protistan grazing and viral lysis losses of bacterial carbon production in a large mesotrophic lake (Lake Biwa)

Spatial patterns of bacterial abundance, activity and community composition in relation to water masses in the eastern Mediterranean Sea

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