Evidence for microbial attenuation of particle flux in the Amundsen Gulf and Beaufort Sea: elevated hydrolytic enzyme activity on sinking aggregates

Kellogg, Colleen T. E.; Carpenter, Shelly D.; Renfro, Alisha A.; Sallon, Amélie; Michel, Christine; Cochran, J. Kirk; Deming, Jody W.

doi:10.1007/s00300-011-1015-0

Cited by 44 publications

(49 citation statements)

References 86 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Accordingly, Forest et al (2011b) estimated that 3% of the primary production in the central Amundsen Gulf was exported to the benthos, during spring-summer 2008. Overall, our results highlight the central role of grazing and recycling processes (see also Kellogg et al 2011) in the southeastern Beaufort Sea during the highly productive summer 2008.…”

Section: Changes Observed In Summer 2008supporting

confidence: 58%

“…For example, bacteria play a key role in controlling carbon fluxes in the ocean through their production and consumption of dissolved organic matter, respiratory CO 2 production, and nutrient recycling (Rivkin and Legendre 2001;Kirchman et al 2009;Kellogg et al 2011). The production of exopolymeric substances by phytoplankton and bacteria can also accelerate (Passow and Alldredge 1994;Verdugo et al 2004) or decrease (Azetsu-Scott and Passow 2004) the sinking export of organic carbon to depth.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Summertime primary production and carbon export in the southeastern Beaufort Sea during the low ice year of 2008

2011

Self Cite

View full text Add to dashboard Cite

Following the extreme low ice year of 2007, primary production and the sinking export of particulate and gel-like organic material, using short-term particle interceptor traps deployed at 100 m, were measured in the southeastern Beaufort Sea during summer 2008. The combined influence of early ice retreat and coastal upwelling contributed to exceptionally high primary production (500 ± 312 mg C m -2 day -1 , n = 7), dominated by large cells ([5 lm, 73% ± 15%, n = 7). However, except for one station located north of Cape Bathurst, the sinking export of particulate organic carbon (POC) was relatively low (range: 38-104 mg C m -2 day -1 , n = 12) compared to other productive Arctic shelves. Estimates indicate that 80% ± 20% of the primary production was cycled through large copepods or the microbial food web. Exopolymeric substances were abundant in the sinking material but did not appear to accelerate POC sinking export. The use of isotopic signatures (d 13 C, d 15 N) and carbon/nitrogen ratios to identify sources of the sinking material was successful only at two stations with a strong marine or terrestrial signature, indicating the limitations of this approach in hydrographically and biologically complex Arctic coastal waters such as in the Beaufort Sea. At these two stations influenced by either coastal upwelling or erosion, the composition and magnitude of particulate sinking fluxes were markedly different from other stations visited during the study. These observations underscore the fundamental role of mesoscale circulation patterns and hydrodynamic singularities on the export of particulate organic material on Arctic shelves.

show abstract

Section: Changes Observed In Summer 2008supporting

confidence: 58%

Section: Introductionmentioning

confidence: 99%

Summertime primary production and carbon export in the southeastern Beaufort Sea during the low ice year of 2008

2011

Self Cite

View full text Add to dashboard Cite

show abstract

“…This indicates that even the microorganisms in oligotrophic oceanic waters have an abundance of substrata, though perhaps only intermittently, to colonize. The increased formation of colloidal, gelatinous, detrital, and aggregate particles due to escalated terrigenous nutrient and organic matter inputs and to algal and jellyfish blooms in estuarine and coastal oceans (312,(316)(317)(318)(319); the augmented tendency of microbial surface associations in response to increasingly oligotrophic conditions in the open oceans (1,2,6,7,106); the enhanced activity of surface-associated microbiota in coastal waters of the polar oceans due to seawater warming, permafrost melting, enhanced primary production, and particle transport from the tundra (320,321); and the elevated activity of surface-associated microbiota in deep waters due to nutrient enrichment (132,199,(278)(279)(280)(281) lead us to hypothesize that surface-associated microbial communities may play even greater roles in ocean carbon cycling under global change scenarios. However, the mechanisms by which surfaceassociated microbial processes impact the ocean's biogeochemical processes and carbon sequestration capacity and the magnitude of this impact, especially under changing environmental conditions, are not well understood.…”

Section: Environmental Change-induced Surface-associated Microbiota Rmentioning

confidence: 99%

Microbial Surface Colonization and Biofilm Development in Marine Environments

Dang

Lovell

2016

Microbiol Mol Biol Rev

872

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

“…Although the observed variability of DOM and productivity can also be due to differences in sampling years (2008 vs. 2009), higher primary production in the Cape Bathurst polynya (52-175 g C m −2 yr −1 ) than in the rest of the Beaufort Sea (including the Mackenzie shelf) is a well recognized feature in the Amundsen Gulf (Arrigo and van Dijken, 2004;Brugel et al, 2009;Forest et al, 2011). In addition to the release of bioavailable DOM from plankton, bacterial degradation of particulate organic matter and zooplankton activities provide additional sources of bioavailable DOM in the Amundsen Gulf (Juul-Pedersen et al, 2010;Forest et al, 2011;Kellogg et al, 2011). The elevated concentrations and yields of TDAA in the Amundsen Gulf are consistent with the higher productivity in this region.…”

Section: Concentrations and Bioavailability Of Dom In The Beaufort Seamentioning

confidence: 99%

Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean

2012

View full text Add to dashboard Cite

Abstract. Dissolved organic carbon (DOC) and total dissolved amino acids (TDAA) were measured in high (Chukchi Sea) and low (Beaufort Sea) productivity regions of the western Arctic Ocean to investigate the composition and bioavailability of dissolved organic matter (DOM). Concentrations and DOC-normalized yields of TDAA in Chukchi surface waters were relatively high, indicating an accumulation of bioavailable DOM. High concentrations and yields of TDAA were also observed in the upper halocline of slope and basin waters, indicating off-shelf transport of bioavailable DOM from the Chukchi Sea. In contrast, concentrations and yields of TDAA in Beaufort surface waters were relatively low, indicting DOM was of limited bioavailability. Concentrations and yields of TDAA in the upper halocline of slope and basin waters were also low, suggesting the Beaufort is not a major source of bioavailable DOM to slope and basin waters. In shelf waters of both systems, elevated concentrations and yields of TDAA were often observed in waters with higher chlorophyll concentrations and productivity. Surface concentrations of DOC were similar (p > 0.05) in the two systems despite the contrasting productivity, but concentrations and yields of TDAA were significantly higher (p < 0.0001) in the Chukchi than in the Beaufort. Unlike bulk DOC, TDAA concentrations and yields reflect ecosystem productivity in the western Arctic. The occurrence of elevated bioavailable DOM concentrations in the Chukchi Sea implies an uncoupling between the biological production and utilization of DOM and has important implications for sustaining heterotrophic microbial growth and diversity in oligotrophic waters of the central Arctic basins.

show abstract

Evidence for microbial attenuation of particle flux in the Amundsen Gulf and Beaufort Sea: elevated hydrolytic enzyme activity on sinking aggregates

Cited by 44 publications

References 86 publications

Summertime primary production and carbon export in the southeastern Beaufort Sea during the low ice year of 2008

Summertime primary production and carbon export in the southeastern Beaufort Sea during the low ice year of 2008

Microbial Surface Colonization and Biofilm Development in Marine Environments

Dissolved organic matter composition and bioavailability reflect ecosystem productivity in the Western Arctic Ocean

Contact Info

Product

Resources

About