Community composition and extracellular enzyme activity of bacteria associated with suspended and sinking particles in contrasting arctic and sub-arctic marine environments

Tamelander, Tobias

doi:10.3354/ame01641

Cited by 8 publications

(7 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…were measured at either the SCM or at 500 m. These depth-related patterns are consistent with the hypothesis that organic nitrogen-containing substrates are preferentially removed from particles as they sink in the water column (Lee et al, 2000;Tamelander, 2013). Nevertheless, peptidase activities remain detectable in bottom waters (down to ca.…”

Section: Pelagic Realmsupporting

confidence: 82%

“…Bulk peptidase activities substantially decreased below the SCM – a trend observed at all stations. In contrast, the highest summed rates and the broadest spectrum of polysaccharide hydrolase activities were measured at either the SCM or at 500 m. These depth‐related patterns are consistent with the hypothesis that organic nitrogen‐containing substrates are preferentially removed from particles as they sink in the water column (Lee et al ., ; Tamelander, ). Nevertheless, peptidase activities remain detectable in bottom waters (down to ca.…”

Section: Discussionmentioning

confidence: 99%

“…Taxa within these classes have been classified as particle-associated in other oceanic regions Thiele et al, 2015) and are among the most ubiquitous surface colonizers (Buchan et al, 2014;Dang and Lovell, 2016). Moreover, Colwelliarelated OTUsdetected in moderate proportions on SCM particleswere proportionally dominant on particles at 500 m, highlighting the influence of epipelagic particle colonization to mesopelagic particle-associated communities (Tamelander, 2013;Thiele et al, 2015). Irrespective of phylogenetically distinct particleassociated communities at the SCM and 500 m, however, polysaccharide hydrolase activities at the two depths overlapped.…”

Section: Particle-associated Fractionmentioning

confidence: 99%

See 2 more Smart Citations

Structure and function of high Arctic pelagic, particle‐associated and benthic bacterial communities

Balmonte

Teske

Arnosti

2018

Environmental Microbiology

View full text Add to dashboard Cite

Arctic marine microbes are affected by environmental changes that may ultimately influence their functions in carbon cycling. Here, we investigated in concert the structure and enzymatic activities of pelagic, particle-associated and benthic bacterial communities in the central Arctic Ocean, and used these data to evaluate microbial structure-function relationships. Our findings showed influences of hydrographic conditions and particle association on community composition, and sharp pelagic-benthic contrasts. In addition to community compositional differences, regional and depth-related patterns in enzymatic activities were observed. Peptide hydrolysis rates were highest in surface waters, especially at ice-free and first year ice-covered regions, and decreased with depth. While the range of hydrolysed polysaccharides showed varying geographic patterns, particles often showed a wider spectrum of polysaccharide hydrolase activities. Summed benthic peptidase rates differed across stations but showed similar proportions of individual enzyme activities. Analysing for potential linkages between structure and function after subtracting the effect of environmental conditions revealed no direct link, indicating functional redundancy to carry out peptide hydrolysis among pelagic microbes. Thus, while community composition and activities are influenced by environmental conditions, bacterial functional redundancy suggests that compositional shifts - in response to the changing Arctic - may have complex and less predictable functional consequences than previously anticipated. © 2018 Society for Applied Microbiology and John Wiley & Sons Ltd.

show abstract

Section: Pelagic Realmsupporting

confidence: 82%

Section: Discussionmentioning

confidence: 99%

Section: Particle-associated Fractionmentioning

confidence: 99%

See 1 more Smart Citation

Structure and function of high Arctic pelagic, particle‐associated and benthic bacterial communities

Balmonte

Teske

Arnosti

2018

Environmental Microbiology

View full text Add to dashboard Cite

show abstract

“…4). This suggests that the microbial community within the aggregates collected at 100 m was, to a large extent, determined by bacterial colonization of particles in the photic zone, e.g., 20 m. Hence, the bacterial communities within settling aggregates were "inherited" from the chlorophyll maximum (16,38). Interestingly, the aggregate-attached community collected at 400 m was different from the free-living communities at any depth down to 700 m and from that attached at 100 m (Fig.…”

Section: Discussionmentioning

confidence: 95%

Colonization in the Photic Zone and Subsequent Changes during Sinking Determine Bacterial Community Composition in Marine Snow

Thiele

Fuchs

Amann

et al. 2015

Appl Environ Microbiol

View full text Add to dashboard Cite

Due to sampling difficulties, little is known about microbial communities associated with sinking marine snow in the twilight zone. A drifting sediment trap was equipped with a viscous cryogel and deployed to collect intact marine snow from depths of 100 and 400 m off Cape Blanc (Mauritania). Marine snow aggregates were fixed and washed in situ to prevent changes in microbial community composition and to enable subsequent analysis using catalyzed reporter deposition fluorescence in situ hybridization (CARD-FISH). The attached microbial communities collected at 100 m were similar to the free-living community at the depth of the fluorescence maximum (20 m) but different from those at other depths (150, 400, 550, and 700 m). Therefore, the attached microbial community seemed to be "inherited" from that at the fluorescence maximum. The attached microbial community structure at 400 m differed from that of the attached community at 100 m and from that of any free-living community at the tested depths, except that collected near the sediment at 700 m. The differences between the particle-associated communities at 400 m and 100 m appeared to be due to internal changes in the attached microbial community rather than de novo colonization, detachment, or grazing during the sinking of marine snow. The new sampling method presented here will facilitate future investigations into the mechanisms that shape the bacterial community within sinking marine snow, leading to better understanding of the mechanisms which regulate biogeochemical cycling of settling organic matter.T he formation of macroscopic organic aggregates such as marine snow is an important process for the removal of photosynthetically fixed carbon from the surface ocean to the deep sea (1). The export of organic matter is the main driver for the oceanic sequestering of atmospheric carbon dioxide on long time scales (2).Settling marine snow aggregates harbor diverse microbial communities that play an important role in the degradation of the organic compounds and release of dissolved nutrients and organic matter to the water column (3-5). Therefore, the attached microbial communities may play an important role in the regulation of the magnitude and efficiency of the biological carbon pump. However, little is known about bacterial community composition and dynamics within marine snow collected below the depths reached by scuba divers. This is because the fragile nature of marine snow makes the collection of individual, intact marine snow particles nearly impossible.Previous investigations have relied on size fractionation of water samples to observe and compare clustering of free-living bacteria to that of bacteria associated with particles (5-8). These studies observed that the composition of the microbial communities associated with particles differed from that of free-living communities in the surrounding water column. However, other studies have found similarities between the free-living and attached microbial communities (9-11), potentially indicating methodolo...

show abstract

“…The distinct temperature optima of the transient deepwater surfaceassociated and resident free-living microorganisms provide a reasonable explanation for findings of limited species exchange between particle-associated and free-living microbial communities throughout the water column (104,128,199). It seems likely that the sinking particle-associated microbial communities are composed mainly of microorganisms that originated from surface seawater, and they lose substantial amounts of activity in the cold deep water (200,201). This is consistent with observations that the metabolic activity and growth rate of deepwater surface-associated microbial communities are usually lower than those of the surrounding free-living microbial communities, although the surface-associated microorganisms are almost exclusively responsible for the production and activity of the extracellular hydrolytic enzymes required for nutrient and labile organic matter production from POM.…”

Section: Physiological Challenges and Deleterious Effects Of Microbiamentioning

confidence: 99%

Microbial Surface Colonization and Biofilm Development in Marine Environments

Dang

Lovell

2016

Microbiol Mol Biol Rev

875

636

View full text Add to dashboard Cite

SUMMARYBiotic and abiotic surfaces in marine waters are rapidly colonized by microorganisms. Surface colonization and subsequent biofilm formation and development provide numerous advantages to these organisms and support critical ecological and biogeochemical functions in the changing marine environment. Microbial surface association also contributes to deleterious effects such as biofouling, biocorrosion, and the persistence and transmission of harmful or pathogenic microorganisms and their genetic determinants. The processes and mechanisms of colonization as well as key players among the surface-associated microbiota have been studied for several decades. Accumulating evidence indicates that specific cell-surface, cell-cell, and interpopulation interactions shape the composition, structure, spatiotemporal dynamics, and functions of surface-associated microbial communities. Several key microbial processes and mechanisms, including (i) surface, population, and community sensing and signaling, (ii) intraspecies and interspecies communication and interaction, and (iii) the regulatory balance between cooperation and competition, have been identified as critical for the microbial surface association lifestyle. In this review, recent progress in the study of marine microbial surface colonization and biofilm development is synthesized and discussed. Major gaps in our knowledge remain. We pose questions for targeted investigation of surface-specific community-level microbial features, answers to which would advance our understanding of surface-associated microbial community ecology and the biogeochemical functions of these communities at levels from molecular mechanistic details through systems biological integration.

show abstract

Community composition and extracellular enzyme activity of bacteria associated with suspended and sinking particles in contrasting arctic and sub-arctic marine environments

Cited by 8 publications

References 41 publications

Structure and function of high Arctic pelagic, particle‐associated and benthic bacterial communities

Structure and function of high Arctic pelagic, particle‐associated and benthic bacterial communities

Colonization in the Photic Zone and Subsequent Changes during Sinking Determine Bacterial Community Composition in Marine Snow

Microbial Surface Colonization and Biofilm Development in Marine Environments

Contact Info

Product

Resources

About