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      The relative importance of water motion on nitrogen uptake by the subtidal macroalga adamsiella chauvinii (rhodophyta) in winter and summer

      Kregting, Louise T.; Hurd, Catriona L.; Pilditch, Conrad A.; Stevens, Craig L.
      DOI
       10.1111/j.1529-8817.2008.00484.x
      Link
       onlinelibrary.wiley.com
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      Kregting, L. T., Hurd, C. L., Pilditch, C. A., & Stevens, C. L. (2008). The relative importance of water motion on nitrogen uptake by the subtidal macroalga adamsiella chauvinii (rhodophyta) in winter and summer. Journal of Phycology, 44(2), 320-330.
      Permanent Research Commons link: https://hdl.handle.net/10289/8284
      Abstract
      The influence of seawater velocity (1.5–12 cm • s⁻¹) on inorganic nitrogen (N) uptake by the soft-sediment perennial macroalga Adamsiella chauvinii (Harv.) L. E. Phillips et W. A. Nelson (Rhodophyta) was determined seasonally by measuring uptake rate in a laboratory flume. Regardless of N tissue content, water velocity had no influence on NO₃⁻ uptake in either winter or summer, indicating that NO₃⁻-uptake rate was biologically limited. However, when thalli were N limited, increasing water velocity increased NH₄⁺ uptake, suggesting that mass-transfer limitation of NH₄⁺ is likely during summer for natural populations. Uptake kinetics (Vmax, Ks) were similar among three populations of A. chauvinii at sites with different mean flow speeds; however, uptake rates of NO₃⁻ and NH₄⁺ were lower in summer (when N status was generally low) than in winter. Our results highlight how N uptake can be affected by seasonal changes in the physiology of a macroalga and that further investigation of N uptake of different macroalgae (red, brown, and green) during different seasons is important in determining the relative influence of water velocity on nutrient uptake.
      Date
      2008
      Type
      Journal Article
      Publisher
      Wiley
      Collections
      • Science and Engineering Papers [3124]
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