Effects of Salinity on Growth and Toxin Production of a Noxious Phytoflagellate, Heterosigma akashiwo (Raphidophyceae)
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S. M. Haque
Abstract
Growth and toxin production of a noxious phytoflagellate Heterosigma akashiwo (Kagoshima strain) were investigated at a salinity range from 20–40‰. The maximum growth (0.68 ± 0.03 divisions day−1) was obtained at 25‰, while the lowest growth (0.48 ± 0.02 divisions day−1) was attained at 40‰. The lower salinity was found suitable for maintaining a better morphological condition and motility of the cells. The Kagoshima strain became more toxic at 20‰, and the toxicity decreased with increased salinity. A negative correlation between salinity increase and toxin production was found on HPLC analysis of H. akashiwo toxins (HaTx-I, II, III and IV). Toxin HaTx-IV (corresponding to oxidized PbTx-2) was most dominant and peaked at 20‰ with a yield of 0.3 pg cell−1. Considerable amounts of HaTx-I and III (corresponding to PbTx-2 and 3) were also detected. However, HaTx-II (corresponding to PbTx-9) was detected only as a trace at 20 and 25‰. A sharp decrease in all toxins was found at salinities above 30‰. The increase of specific growth rate raised the toxin content per cell of the strain.
Copyright © 2002 by Walter de Gruyter GmbH & Co. KG
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Articles in the same Issue
- Comparative Sensitivity of Seven Marine Microalgae to Cumulative Exposure to Ultraviolet-B Radiation with Daily Increasing Doses
- Microspatial Variability Inside Epilithic Algal Communities within Territories of the Damselfish Stegastes nigricans at La Réunion (Indian Ocean)
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- Chemical Composition of the Brown Alga Padina pavonia (L.) Gaill. from the Adriatic Sea
- Spatial and Seasonal Distribution of Seaweeds on Coral Reefs from Southern Bahia, Brazil
- Effects of Salinity on Growth and Toxin Production of a Noxious Phytoflagellate, Heterosigma akashiwo (Raphidophyceae)
- Monthly Monitoring of Domoic Acid Producer Pseudo-nitzschia multiseries (Hasle) Hasle Using Species-Specific DNA Probes and WGA Lectins and Abundance of Pseudo-nitzschia Species (Bacillariophyceae) from Chinhae Bay, Korea
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