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2008, Volume 2, Issue 3

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Frontiers of Environmental Science & Engineering >> 2008, Volume 2, Issue 3 doi: 10.1007/s11783-008-0055-3

Allelopathic inhibition on red tide microalgae by five macroalgal extracts

1.Key Laboratory of Marine Environmental Science and Ecology of Ministry of Education, College of Environmental Science and Engineering, Ocean University of China; 2.State Key Joint Laboratory of Environmental Simulation and Pollution Control, Department of Environmental Science and Engineering, Tsinghua University;

Available online: 2008-09-05
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Abstract

This study aims to identify effective antialgal allelochemicals from marine macroalgae that inhibit the growth of red tide microalgae. Practically, new algicidal agents were developed to control red tide. The growth inhibitory effects of 5 marine macroalgae , , , , and on were evaluated by adding crude seawater extracts of macroalgal dry tissue into the culture medium containing . The half-effective concentrations at 120 h (EC) of the seawater extracts were 0.6, 0.9, 1.0, 1.0, and 4.7 g/L for the five macroalgae above, respectively. , and showed strong allelopathic effect on the growth of . There have been no previous reports with regard to the allelopathic effects of the former two macroalgae so far. The possible allelochemicals of 21 compounds of the were detected using Gas chromatography-mass spectrometry (GC-MS) analysis. Unsaturated fatty acids, acrylic acid (CHO), and linolenic acid (CHO) were the most likely allelochemicals in .

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