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ALLELOCHEMICALS OF BOTRYOCOCCUS BRAUNII (CHLOROPHYCEAE)1
Article first published online: 16 APR 2004
Journal of Phycology
Volume 40, Issue 3, pages 474–480, June 2004
How to Cite
Chiang, I.-Z., Huang, W.-Y. and Wu, J.-T. (2004), ALLELOCHEMICALS OF BOTRYOCOCCUS BRAUNII (CHLOROPHYCEAE). Journal of Phycology, 40: 474–480. doi: 10.1111/j.1529-8817.2004.03096.x
1Received 29 May 2003. Accepted 12 February 2004.
- Issue published online: 24 MAY 2004
- Article first published online: 16 APR 2004
- free fatty acid;
- Liyu lake;
The alga Botryococcus braunii Kützing (Chlorophyceae) present in Liyu Lake (Huanlien County, Taiwan) has toxic effects on a variety of aquatic organisms. Blooms of this alga, which typically occur in autumn, are associated with fish deaths in this lake. Experiments using 15 phytoplankton and 5 zooplankton isolated from Liyu Lake indicate that these plankton exhibit various susceptibilities to B. braunii. A close correlation between the degree of susceptibility tested in the laboratory and the absence of certain phytoplankton during B. braunii blooms in the lake was observed, suggesting allelopathic effects. Isolation, identification, and verification with authentic compounds indicated that allelochemicals were a mixture of free fatty acids, including α-linolenic, oleic, linolic, and palmitic acids. Compared with other phytoplankton isolates, B. braunii produced significantly higher amounts of free fatty acids, particularly of oleic and α-linolenic acids. The role of these fatty acids in favoring dominance of B. braunii in the natural environment was elucidated.