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Seasonal patterns of growth and nutrient status of the macroalga Adamsiella chauvinii (Rhodophyta) in soft sediment environments

Citation

Kregting, LT and Hepburn, CD and Hurd, CL and Pilditch, CA, Seasonal patterns of growth and nutrient status of the macroalga Adamsiella chauvinii (Rhodophyta) in soft sediment environments, Journal of Experimental Marine Biology and Ecology, 360, (2) pp. 94-102. ISSN 0022-0981 (2008) [Refereed Article]

Copyright Statement

Copyright 2008 Elsevier B.V.

DOI: doi:10.1016/j.jembe.2008.04.001

Abstract

The seasonal growth and nutrient status of the temperate subtidal macroalga Adamsiella chauvinii was determined at three soft sediment sites with different ranges of tidally-driven current speeds. A. chauvinii thalli exhibited maximum growth rates during the late summer (February) and no evidence of nitrogen limited growth in summer as often exhibited by macroalgae growing on hard substrata in temperate environments. We suggest that growth was maintained during the summer period, when seawater nitrogen concentrations were low, by localized sources of ammonium probably produced by sediments and fauna within the canopy. Growth rates were up to 50% lower at the site with the slowest water velocity throughout most of the experimental period. However a greater tissue nitrogen content of A. chauvinii thalli at the slow flow site did not support evidence for mass-transfer limitation. It is suggested that as a consequence of slow flow, sedimentation on blade surfaces reduced the amount of light available for photosynthesis and growth. Lower growth rates at the slow flow site reduced metabolic demand for nutrients resulting in accumulation of tissue nitrogen and phosphate.

Item Details

Item Type:Refereed Article
Keywords:seaweed, water motion, growth, physiology, hydrodynamics
Research Division:Biological Sciences
Research Group:Ecology
Research Field:Marine and Estuarine Ecology (incl. Marine Ichthyology)
Objective Division:Environment
Objective Group:Ecosystem Assessment and Management
Objective Field:Ecosystem Assessment and Management of Coastal and Estuarine Environments
Author:Hurd, CL (Associate Professor Catriona Hurd)
ID Code:93030
Year Published:2008
Web of Science® Times Cited:15
Deposited By:IMAS Research and Education Centre
Deposited On:2014-07-08
Last Modified:2014-08-04
Downloads:0

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