New Zealand Journal of Marine and Freshwater Research abstracts
Short communication
Recent occurrence of Cylindrospermopsis raciborskii
in Waikato lakes of New Zealand
E. F. Ryan
D. P. Hamilton
Department of Biological Sciences
University of Waikato
Private Bag 3105
Hamilton, New Zealand
email: efr@waikato.ac.nz
email: d.hamilton@waikato.ac.nz
G. E. Barnes
Environment Waikato
P.O. Box 4010
Hamilton, New Zealand
email: grant.barnes@ew.govt.nz
Abstract Cylindrospermopsis raciborskii is a
toxin-producing species of cyanobacteria that in autumn 2003 was recorded
for the first time in three shallow (max. depth ≤5 m) Waikato lakes and a
hydro-electric dam on the Waikato River, New Zealand. It formed water blooms
at densities >100 000 cells/ml in Lakes Waahi and Whangape. Net rates
of population growth >0.2 day-1 were recorded for C. raciborskii
in Lakes Ngaroto, Waahi, and Karapiro, based on comparisons of low numbers
(detection of <10 cells/ml) from initial samples and its presence at bloom
densities (>15 000 cells/ml) in the subsequent sample “x”-“y” days later.
C. raciborskii may be well adapted to rapid proliferation in the Waikato
lakes, which are eutrophic to hypertrophic, with high light attenuation,
and where nitrogen (N) fixation may provide it with a competitive advantage
over non-nitrogen fixing algae under N-limited conditions.
Keywords cyanobacteria; Cylindrospermopsis raciborskii;
lakes; New Zealand
M03025 Received 16 May 2003; accepted 7 July 2003; Online publication
date 31 October 2003
New Zealand Journal of Marine and Freshwater Research, 2003, Vol. 37:
829-836
0028-8330/03/3704-0829 $7.00 © The Royal Society of New Zealand
2003
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