Growth Inhibition of Blue-green Algae by Allelopathic Effects of Macrophytes.
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概要
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Inhibitory effects of macrophytes on the growth of blue-green algae (<I>Microcystis aeruginosa, Anabaena flos-aquae, Phormidium tenue</I>) were assayed in a mixed culture system with various concentrations of macrophytes, (i.e., coexistence assay) . <I>Egeria densa, Cabomba caroliniana, Myriophyllum spicatum, Ceratophyllum demersum, Eleocharis acicularis, Potamogeton oxyphyllus, Potamogeton crispus, Limnophila sessiliflora</I> and <I>Vallisneria denseserrulata</I> were used as macrophytes. The coexistence assay showed the inhibitory effects of the macrophytes on algal growth and that, among the 9 macrophytes, <I>C. caroliniana</I> and <I>M. spicatum</I> were the only species to inhibit growth of all the species of blue green algae. The inhibitory effects of <I>M. spicatum</I> were stronger than those of <I>C. caroliniana</I>.<BR>Due to its strong inhibition, we used the cultured solution of <I>M. spicatum</I> for an algal assay to confirm that the inhibitory effect of <I>M. spicatum</I> is caused by allelopathic compounds secreted by <I>M. spicatum</I>. The growth of <I>M. aeruginosa</I> was significantly inhibited by the quasi-continuous addition of the cultured solution of <I>M. spicatum</I>, whereas the initial addition did not inhibit their growth. Such results provide the evidence of the allelopathic compounds, which must be continuously secreted by <I>M. spicatum</I>.
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