New Zealand Journal of Marine and Freshwater Research abstracts
Algal blooms and climate anomalies in north-east New Zealand, August -December 1992
LESLEY L. RHODES
Cawthron Institute Private Bag 2 Nelson, New Zealand
ALLISON J. HAYWOOD
Department of Environmental Science
University of Auckland
Private Bag
Auckland, New Zealand
W. J. BALLANTINE
Leigh Marine Laboratory University of Auckland
A. LINCOLN MacKENZIE
Cawthron Institue
Abstract
A raphidophyte-dominated phytoplankton bloom extended discontinuously along the northeastern coastline of New Zealand, from Bream Tail, north of Leigh, to the western coast of the Coromandel Peninsula from late August until December 1992. The bloom was associated with an "El-Nino" phase of the Southern Oscillation, resulting in unusually cold sea temperatures. The dominant bloom species in the north was
Fibrocapsa japonica and in the south
Heterosigma akashiwo. Associated species included the coccolithophorid
Gephyrocapsa oceanica and the naked form of the silicoflagellate
Dictyocha speculum. By December, numbers of the armoured form of
D. speculum had increased, as those of raphidophytes and coccolithophorids declined. Bioassays to test for shellfish biotoxins were negative
dad Anemia salina bioassays, indicators of ichthyotoxicity, were negative except for
Heterosigma akashiwo cultures, isolated from Coromandel water samples.
Keywords Fibrocapsa japonica; Heterosigma akashiwo; raphidophyte; Dictyocha speculum; silicoflagellate; Gephyrocapsa oceanica; climate; coccolithophorid; phytoplankton bloom
New Zealand Journal of Marine and Freshwater Research, 1993: Vol. 27: The Royal Society of New Zealand 1993
Received 4 June 1993; accepted 22 September 1993
PDF file of entire paper: medium quality (1314K); (scanned from paper original: notes about this process)
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