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Toxic Characteristics and Action Mode of the Mixotrophic Dinoflagellate Akashiwo sanguinea on Co-Occurring Phytoplankton and Zooplankton

Author

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  • Xiaoer Wu

    (Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
    Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China
    Marine Resources Big Data Center of South China Sea, Southern Marine Science and Engineering Guangdong Laboratory, Zhanjiang 524013, China)

  • Ying Yang

    (Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
    Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China)

  • Yeyin Yang

    (Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
    Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China)

  • Ping Zhong

    (Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
    Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China)

  • Ning Xu

    (Institute of Hydrobiology, Jinan University, Guangzhou 510632, China
    Key Laboratory of Eutrophication and Red Tide Prevention of Guangdong Higher Education Institutes, Jinan University, Guangzhou 510632, China)

Abstract

The mixotrophic dinoflagellate Akashiwo sanguinea frequently forms harmful algal blooms around the world and has caused massive deaths of shellfish, finfish and birds, yet its toxic mechanism is still unclear. In this study, toxic effects of A. sanguinea on co-culturing phytoplankton and zooplankton were investigated. The results showed that sonicated cultures of A. sanguinea JX13 and JX14, isolated from the Pearl River Estuary, had a significant lethal effect on the rotifer Brachionus plicatilis , with the highest mortality rate of 80%. The highest inhibition rates of A. sanguinea cultures JX13 (90%) and JX14 (80%) on R. salina were much higher than that of AS2 (20%). Toxicity varied with the growth stage, during which A. sanguinea cells in the exponential stage showed the highest toxicity (40%), while A. sanguinea filtrate had the highest toxicity (10%) in the decline stage. The action mode of A. sanguinea toxicity on plankton was explored through an osmotic membrane culture device. It was found that A. sanguinea JX13 displayed an inhibitory effect on coexisting phytoplankton, whether they had contact or not, but the inhibition rate increased by 25% with contact. A lethal effect of A. sanguinea JX13 on rotifer Brachionus plicatilis was observed only in contact treatment. This study suggests that direct contact is the key action mode to trigger the release of toxins and induce toxic effects of A. sanguinea on co-occurring plankton.

Suggested Citation

  • Xiaoer Wu & Ying Yang & Yeyin Yang & Ping Zhong & Ning Xu, 2021. "Toxic Characteristics and Action Mode of the Mixotrophic Dinoflagellate Akashiwo sanguinea on Co-Occurring Phytoplankton and Zooplankton," IJERPH, MDPI, vol. 19(1), pages 1-13, December.
    • Handle: RePEc:gam:jijerp:v:19:y:2021:i:1:p:404-:d:714971
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    References listed on IDEAS

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    1. Wolfgang K. Vogelbein & Vincent J. Lovko & Jeffrey D. Shields & Kimberly S. Reece & Patrice L. Mason & Leonard W. Haas & Calvin C. Walker, 2002. "Pfiesteria shumwayae kills fish by micropredation not exotoxin secretion," Nature, Nature, vol. 418(6901), pages 967-970, August.
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