Increased mass transfer to microorganisms with fluid motion

Logan, Bruce E.; Dettmer, James W.

doi:10.1002/bit.260351109

Cited by 30 publications

(33 citation statements)

References 30 publications

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“…Our data confirm this and indicate that the actual amount of material did not increase with velocity; therefore any unattached, suspended organisms actively removing ammonium were likely too small to benefit from increases in turbulence within the water column (e.g. Logan & Dettmer 1990, Karp-Boss et al 1996.…”

Section: Effects Of Water Flow On Uptakesupporting

confidence: 80%

Prediction and validation of flow-dependent uptake of ammonium over a seagrass-hardbottom community in Florida Bay

Cornelisen¹,

Thomas²

2009

Mar. Ecol. Prog. Ser.

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Hydrodynamic surveys and field flume experiments were carried out to characterize water flow and measure nutrient uptake over a shallow hardbottom flat sparsely colonized by seagrasses, a complex community type commonly found along corridors linking Florida Bay and the Florida reef tract. Acoustic Doppler velocimeter profiles collected in tide-driven flows revealed benthic hydrodynamic conditions indicative of disturbed boundary layer flow; attenuation of flow near the benthos and measures of bottom friction were considerably less than observed in densely colonized seagrass beds. Mass-transfer coefficients (S) for ammonium, predicted using velocity data and estimates of bottom friction, ranged between 0. . Values of S measured using a field flume were within the same range as predicted values, validating that ammonium uptake by the community is occurring near the masstransfer limit. Mass-transfer coefficients fell slightly above those previously measured for low-relief coral rubble and below those for dense seagrass canopies, thereby confirming a close link between bottom roughness and mass transfer. Predicted ammonium uptake based on ambient velocity and nutrient concentrations varied considerably over the tidal cycle (range = 0.014 to 0.094 µmol NH 4 m -2 s -1 ) and highlighted the importance of temporal variation in both current velocity and nutrient concentration in driving rates of nutrient uptake. Additional field flume experiments using 15 N-labeled ammonium enabled us to examine flow-dependent uptake for a number of organisms within the complex community. Uptake rates were found to vary among seagrasses, macroalgae, and finger corals, perhaps due to physiological or morphological differences or varying locations within the canopy.

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Section: Effects Of Water Flow On Uptakesupporting

confidence: 80%

Prediction and validation of flow-dependent uptake of ammonium over a seagrass-hardbottom community in Florida Bay

Cornelisen¹,

Thomas²

2009

Mar. Ecol. Prog. Ser.

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“…In natural waters, unattached microorganisms move with the bulk fluid [55], so that no flux enhancement will occur due to fluid motion for the uptake of typical (small) solutes by small, freely suspended microorganisms [25,27,35,41,56,57]. On the other hand, swimming and sedimentation have been postulated to alleviate diffusive transport limitation for larger organisms.…”

Section: Influence Of Steady Uniform Flowsmentioning

confidence: 99%

Critical Evaluation of Physicochemical Parameters and Processes for Modelling the Biological Uptake of Trace Metals in Environmental (Aquatic) Systems

Wilkinson

Buffle

2004

Physicochemical Kinetics and Transport at Biointerfaces

122

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“…[86] Since unattached microorganisms move with the bulk fluid, [91] no uptake enhancement is expected to occur due to fluid motion for the uptake of typical (small) solutes by small, freely suspended microorganisms. [85,90,[92][93][94] …”

Section: Diffusive Limitation Of Metal Uptakementioning

confidence: 99%

Predicting the Bioavailability of Metals and Metal Complexes: Critical Review of the Biotic Ligand Model

Slaveykova¹,

Wilkinson²

2005

Environ. Chem.

296

273

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Abstract. The biotic ligand model is a useful construct both for predicting the effects of metals to aquatic biota and for increasing our mechanistic understanding of their interactions with biological surfaces. Since biological effects due to metals are always initiated by metal bioaccumulation, the fundamental processes underlying bio-uptake are examined in this review. The model assumes that the metal of interest, its complexes, and metal bound to sensitive sites on the biological surface are in chemical equilibrium. Therefore, many of the equilibrium constants required for the model have been compiled and their methods of determination evaluated. The underlying equilibrium assumption of the BLM is also examined critically. In an attempt to identify which conditions are appropriate for its application, several documented examples of failures of the BLM are discussed. Finally, the review is concluded by identifying some important future research directions.

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Increased mass transfer to microorganisms with fluid motion

Cited by 30 publications

References 30 publications

Prediction and validation of flow-dependent uptake of ammonium over a seagrass-hardbottom community in Florida Bay

Prediction and validation of flow-dependent uptake of ammonium over a seagrass-hardbottom community in Florida Bay

Critical Evaluation of Physicochemical Parameters and Processes for Modelling the Biological Uptake of Trace Metals in Environmental (Aquatic) Systems

Predicting the Bioavailability of Metals and Metal Complexes: Critical Review of the Biotic Ligand Model

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