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dc.contributor.authorKregting, Louise T.
dc.contributor.authorHurd, Catriona L.
dc.contributor.authorPilditch, Conrad A.
dc.contributor.authorStevens, Craig L.
dc.identifier.citationKregting, 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.en_NZ
dc.description.abstractThe 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.en_NZ
dc.relation.ispartofJournal of Phycology
dc.subjectAdamsiella chauviniien_NZ
dc.subjectnitrogen uptakeen_NZ
dc.subjectsubtidal macroalgaeen_NZ
dc.subjectwater velocityen_NZ
dc.titleThe relative importance of water motion on nitrogen uptake by the subtidal macroalga adamsiella chauvinii (rhodophyta) in winter and summeren_NZ
dc.typeJournal Articleen_NZ
dc.relation.isPartOfJournal of Phycologyen_NZ

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