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JPR Advance Access originally published online on June 17, 2004
Journal of Plankton Research 2004 26(10):1183-1197; doi:10.1093/plankt/fbh108
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Journal of Plankton Research Vol. 26 No. 10 © Oxford University Press 2004; all rights reserved

Effect of cell flotation on growth of Anabaena circinalis under diurnally stratified conditions

Karen J. Westwood1,* and George G. Ganf1,2

1 Environmental Biology, School of Earth and Environmental Sciences and Cooperative Research Centre for Water Quality and Treatment, The University of Adelaide, Adelaide, South Australia, 5005, Australia and 2 Cooperative Research Centre for Freshwater Ecology, The University of Adelaide, Adelaide, South Australia, 5005, Australia

* Corresponding Author: karen.westwood{at}adelaide.edu.au

Received March 1, 2004; accepted in principle April 29, 2004; accepted for publication June 3, 2004; published online June 17, 2004

We tested the hypothesis that the growth rate of Anabaena circinalis, under diurnally stratified conditions, would increase as flotation velocity increased owing to higher light availability. An in situ experiment compared the growth of diurnally stratified populations of A. circinalis with flotation velocities of 0.5 and 1.0 m h–1, with neutrally buoyant populations that were exposed to either mixed or persistently stratified conditions. The experiment was conducted in the turbid lower Murray River in South Australia (vertical attenuation coefficient = 4.52 ± 0.36 m–1). To represent the mixing patterns, A. circinalis was contained in diffusion chambers that were moved to different positions in the water column throughout the day. Diurnal populations with flotation velocities of 1.0 and 0.5 m h–1 grew at 0.23 ± 0.01 and 0.15 ± 0.01 day–1, respectively. Mixed populations grew at 0.19 ± 0.01 day–1, whereas persistently stratified populations grew at 0.43 ± 0.01 day–1. Results were used to extend a model that predicts growth of A. circinalis when exposed to the different mixing patterns. The model showed that blooms are unlikely to be formed when the period of diurnal stratification is <1 week, regardless of flotation velocity. When the diurnally stratified period is >1 week, flotation velocity is important and a bloom may form depending on values assigned to the growth period and maximum mixed depth (Zm).


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