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JPR Advance Access published online on June 17, 2004
Journal of Plankton Research, doi:10.1093/plankt/fbh108
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Received March 1, 2004
Accepted June 3, 2004

Article

Effect of Cell Flotation on Growth of Anabaena Circinalis Under Diurnally Stratified Conditions

Karen J. Westwood 1* George G. Ganf 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
2 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; Cooperative Research Centre for Freshwater Ecology

* To whom correspondence should be addressed. E-mail: karen.westwood{at}adelaide.edu.au.


  Abstract

We tested the hypothesis that the growth rate of Anabaena circinalis, under diurnally stratified conditions, would increase as flotation velocity increased due 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 less than one week, regardless of flotation velocity. When the diurnally stratified period is greater than one 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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