New Zealand Journal of Marine and Freshwater Research abstracts

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Planktonic cyanobacteria in New Zealand inland waters: distribution and population dynamics

RICK D. PRIDMORE¹

M. KAY ETHEREDGE²

¹Water Quality Centre Ministry of Works and Development Private Bag, Hamilton New Zealand

²Department of Biological Sciences Waikato University Private Bag, Hamilton New Zealand

Abstract One hundred and four taxa of planktonic cyanobacteria (blue-green algae) have been recorded from New Zealand lakes: 32 belong to the Chroococcales, 72 to the Nostocales. None of the taxa is endemic to New Zealand; most (if not all) are cosmopolitan. On average, more taxa have been reported from North Island (7.8 + 6.7, N = 69) than South Island lakes (3.3 ± 3.9, N = 59). This difference is attributable, in part, to the large proportion of glacial lakes in the South Island, which are commonly poor in plant nutrients and possess sparse phytoplankton populations. Many of the taxa show a strong preference for eutrophic conditions. Notable exceptions are Anabaena affinis and Gom-phosphaeria lacustris, which occur in a large proportion of mesotrophic (48%) and oligotrophic lakes (43%), respectively. Taxa which are often abundant and frequently responsible for conspicuous water-blooms are Microcystis aeruginosa, Anabaena cir-cinalis, A. flos-aquae and A. spiroides. The limited population data available indicate a high level of interannual variability in the timing, magnitude, and duration of cyanobacterial blooms in New Zealand lakes.

Keywords blue-green algae; cyanobacteria; lakes; distribution; phytoplankton; population dynamics; water-blooms; New Zealand

New Zealand Journal of Marine and Freshwater Research, 1987, Vol. 21: 491-502 0028-8330/87/2103-0491$2.50/0 © Crown copyright 1987 Received 19 February 1987; accepted 13 April 1987

PDF file of entire paper: medium quality (949K); (scanned from paper original: notes about this process)

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