2006
DOI: 10.3354/meps312001
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Water flow enhances ammonium and nitrate uptake in a seagrass community

Abstract: The impact of hydrodynamic regime on rates of nutrient uptake for a seagrass community and for individual components of the community (Thalassia testudinum, epiphytes, phytoplankton, microphytobenthos) was quantified through the deployment of a field flume and application of 15 N-labeled ammonium and nitrate tracers. Ammonium uptake rates for the community and for seagrass leaves and epiphytes were enhanced with increased bulk velocity (uptake rate ∝ U b 0.57 to 0.70 ) and Reynolds shear stress at the top of t… Show more

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Cited by 46 publications
(48 citation statements)
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References 39 publications
(55 reference statements)
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“…Thalassia testudinum shoot density varied substantially between flume deployment locations (n sh = 58 to 459, mean ± SD = 283 ± 110 shoots m Significant regressions for S were calculated in 25 of the experiments ( ) were consistent with results from earlier studies at this site (Cornelisen & Thomas 2009) and in line with measurement from other Thalassia testudinum communities (Thomas et al 2000, Thomas & Cornelisen 2003, Cornelisen & Thomas 2006.…”
Section: Site Uptake and Flow Characterizationsupporting
confidence: 76%
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“…Thalassia testudinum shoot density varied substantially between flume deployment locations (n sh = 58 to 459, mean ± SD = 283 ± 110 shoots m Significant regressions for S were calculated in 25 of the experiments ( ) were consistent with results from earlier studies at this site (Cornelisen & Thomas 2009) and in line with measurement from other Thalassia testudinum communities (Thomas et al 2000, Thomas & Cornelisen 2003, Cornelisen & Thomas 2006.…”
Section: Site Uptake and Flow Characterizationsupporting
confidence: 76%
“…While this result does not conclusively address possible differences in the uptake affinity of these 2 DIN species, it highlights the importance of selecting -and then measuring or modeling -the velocities most relevant to the uptake processes under investigation. The differences between ammonium and nitrate uptake observed here are similar to those observed by Cornelisen & Thomas (2006). Ammonium is often the preferred source of N as it does not require increasing enzyme activity to process it.…”
Section: Uptake and Kcsupporting
confidence: 75%
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“…Higher flow can increase O 2 metabolism in Z. marina meadows through several mechanisms. For example, increased flow reduces the leaf boundary layers and allows for faster rates of gas exchange and nutrient uptake , Cornelisen & Thomas 2006. Also, elevated turbulent mixing from increased current flow that penetrates into the canopy (Hansen & Reidenbach 2013) can increase canopy and sediment oxygenation through flushing, by providing more O 2 for respiration.…”
Section: Short Timescale: Minute To Hourlymentioning
confidence: 99%