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The role of hydrodynamics in structuring in situ ammonium uptake within a submerged macrophyte community
Morris, E.P.; Peralta, G.; Van Engeland, T.; Bouma, T.J.; Brun, F.G.; Lara, M.; Hendriks, I.E.; Benavente, J.; Soetaert, K.; Middelburg, J.J.; Perez-Llorens, J.L. (2013). The role of hydrodynamics in structuring in situ ammonium uptake within a submerged macrophyte community. Limnol. Oceanogr. 3: 210-224. hdl.handle.net/10.1215/21573689-2397024
In: Limnology and Oceanography. American Society of Limnology and Oceanography: Waco, Tex., etc.. ISSN 0024-3590, more
Peer reviewed article  

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Keywords
    Caulerpa prolifera (Forsskål) J.V.Lamouroux, 1809 [WoRMS]; Cymodocea nodosa (Ucria) Ascherson, 1870 [WoRMS]
Author keywords
    nutrients: water flow; patchiness; Cymodocea nodosa; Caulerpa prolifera; 15NH4

Authors  Top 
  • Morris, E.P.
  • Peralta, G.
  • Van Engeland, T., more
  • Bouma, T.J., more
  • Brun, F.G.
  • Lara, M.
  • Hendriks, I.E.
  • Benavente, J.
  • Soetaert, K., more
  • Middelburg, J.J., more
  • Perez-Llorens, J.L.

Abstract
    In low-nutrient, macrophyte-dominated coastal zones, benthic ammonium (NH4+) uptake may be influencedby the structural properties of plant canopies via their effect on near-bed hydrodynamics. Using adual-tracer (uranine and 15NH4+) method that does not require enclosures, we examined how this processaffects nutrient uptake rates within a tidally dominated, patchy Caulerpa prolifera–Cymodocea nodosalandscape. NH4+ uptake was determined by calculating tissue 15N excesses and correcting for 15N enrichmentas derived from uranine concentration. Vertical hydrodynamic profiles were measured in thedownstream flow direction from outside to inside of the C. nodosa bed by using an array of acousticDoppler velocimeters. The transition from a C. prolifera to a C. nodosa bed included a change in bothbenthic canopy properties (short and dense to tall and sparse) and sediment topography (0.2-m increasein water column depth) that resulted in an increase in longitudinal advection and turbulent diffusivitywithin the C. nodosa canopy between 0.5 and 1.5mfrom the leading edge. Vertical differences in canopywater exchange appeared to explain variations in uptake between biotic functional groups; however, noclear differences in longitudinal uptake were found. Using in situ labeling, this study demonstrated for thefirst time the role of hydrodynamics in structuring NH4+ uptake within an undisturbed, patchy macrophytelandscape.

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