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First efficacy study of the effect of anthraquinone-19 on chlorophyll a levels (A), the abundance of O. perornata (B), the abundance of green algae (C), and 2-methylisoborneol levels (D) in pond water. Each symbol is the mean ± standard deviation of the mean of measurements in three replicate limnocorrals. Means on the same day with the same letter are not significantly different (P ≤ 0.05) based upon LSD values. Symbols: •, controls; ○, 2 μM anthraquinone-19.
