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Combined effects of hypoxia and starvation on the survival and growth rates of autotrophic, mixotrophic, and heterotrophic dinoflagellates

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Abstract

Global warming is exacerbating coastal hypoxia by intensifying stratification. Marine hypoxia often causes large-scale mortality of fish, shellfish, and mammals. However, there have only been a few studies on the effect of hypoxia on dinoflagellate survival. Here, we explored the hypoxic effects on the growth rates of dinoflagellates with different trophic modes: autotrophic Alexandrium fraterculus and Scrippsiella lachrymosa; mixotrophic Alexandrium pohangense, Gymnodinium smaydae, and Shimiella gracilenta; and heterotrophic Gyrodinium dominans and Protoperidinium pellucidum. Additionally, we tested feeding as a tactic to reduce hypoxia-induced mortality. Hypoxia reduced the growth rates of all the tested species. However, feeding suitable prey to A. pohangense, G. smaydae, S. gracilenta, G. dominans, and P. pellucidum reduced their mortality due to hypoxia. Furthermore, feeding enabled A. pohangense and G. dominans to survive under hypoxic conditions. Therefore, feeding could be used as a strategy for survival and reduction of mortality in mixotrophic and heterotrophic dinoflagellates against hypoxia.

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Data collected and analyzed during this study are available from the corresponding author on reasonable request.

Abbreviations

DO:

Dissolved oxygen (mg L1)

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Acknowledgements

The authors would like to thank editors and reviewers for their valuable comments.

Funding

This research was supported by the National Research Foundation of Korea funded by the Ministry of Science and ICT (NRF-2021M3I6A1091272; NRF-2021R1A2C1093379) and Korea Institute of Marine Science & Technology Promotion (KIMST) funded by the Ministry of Oceans and Fisheries (20230018) award to HJJ.

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SHE and HJJ designed the study conception. SHE and HJJ drafted the manuscript. SHE, HJJ, JHO, SAP, HCK, and JHY conducted experiments. SHE, HJJ, and JHO conducted data analyses. All authors discussed the results.

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Correspondence to Hae Jin Jeong.

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Responsible Editor: S. Shumway.

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Eom, S.H., Jeong, H.J., Ok, J.H. et al. Combined effects of hypoxia and starvation on the survival and growth rates of autotrophic, mixotrophic, and heterotrophic dinoflagellates. Mar Biol 171, 42 (2024). https://doi.org/10.1007/s00227-023-04363-5

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  • DOI: https://doi.org/10.1007/s00227-023-04363-5

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