eCite Digital Repository

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

Citation

Kregting, LT and Hurd, CL and Pilditch, CA and Stevens, CL, 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) pp. 320-330. ISSN 0022-3646 (2008) [Refereed Article]

Copyright Statement

Copyright 2008 Phycological Society of America

DOI: doi:10.1111/j.1529-8817.2008.00484.x

Abstract

The influence of seawater velocity (1.512 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.

Item Details

Item Type:Refereed Article
Keywords:seaweed, water motion, nitrogen uptake, Adamsiella chauvinii, ammonium, nitrate, nitrogen uptake, subtidal macroalgae, water velocity
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Phycology (incl. Marine Grasses)
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Hurd, CL (Associate Professor Catriona Hurd)
ID Code:93032
Year Published:2008
Web of Science® Times Cited:13
Deposited By:IMAS Research and Education Centre
Deposited On:2014-07-08
Last Modified:2014-11-24
Downloads:0

Repository Staff Only: item control page