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Effect of salinity on the growth and toxicity of the bloom forming cyanobacterium Nodularia spumigena Mertens from Australian waters

Citation

Blackburn, SI and McCausland, M and Bolch, CJS and Newman, S and Jones, GJ, Effect of salinity on the growth and toxicity of the bloom forming cyanobacterium Nodularia spumigena Mertens from Australian waters, Phycologia, 35, (6) pp. 511 - 522. ISSN 0031-8884 (1996) [Refereed Article]

DOI: doi:10.2216/i0031-8884-35-6-511.1

Abstract

Nodularia spumigena Mertens blooms in a number of Australia's estuarine systems and coastal embayments. We investigated the effect of four salinities between fresh water (0 g kg -1) and sea water (35 g kg -1) on growth rate, cell yield, cell dry weight and toxicity of strains isolated from three Australian populations and studied under controlled environmental conditions in the laboratory. Growth rates were significantly lower at 0 g kg-1 than at the higher salinities, and cell yields at 0 and 35 g kg-1 were lower than at 12 and 24 g kg-1 salinity. This indicates that salinity extremes do not favour W. spumigena bloom development. Salinity affected nodularin content in the logarithmic phase of growth: as salinity increased, toxin content decreased, on both a dry weight and a per cell basis. In the stationary phase of growth, nodularin content was lowest at 35 g kg-1 salinity. It increased significantly between logarithmic and stationary phases of growth. Cell mass (dry weight per cell) was not affected by growth phase. Our results indicate that mature blooms will be more toxic than developing ones because of their greater biomass and higher toxin content (on both dry weight and per cell bases).

Item Details

Item Type:Refereed Article
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Phycology (incl. Marine Grasses)
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - Aquaculture
Objective Field:Fisheries - Aquaculture not elsewhere classified
Author:Bolch, CJS (Dr Christopher Bolch)
ID Code:40323
Year Published:1996
Web of Science® Times Cited:29
Deposited By:TAFI - Aquaculture
Deposited On:2006-08-01
Last Modified:2006-09-04
Downloads:0

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