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The Korean Society of Phycology (한국조류학회(藻類))
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Reduction in CO2 uptake rates of red tide dinoflagellates due to mixotrophy

  • Jeong, Hae Jin (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Lee, Kitack (School of Environmental Science and Engineering, Pohang University of Science and Technology) ;
  • Yoo, Yeong Du (Department of Marine Biotechnology, College of Ocean Science and Technology, Kunsan National University) ;
  • Kim, Ja-Myung (School of Environmental Science and Engineering, Pohang University of Science and Technology) ;
  • Kim, Tae Hoon (School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University) ;
  • Kim, Miok (School of Environmental Science and Engineering, Pohang University of Science and Technology) ;
  • Kim, Ju-Hyoung (Faculty of Marine Applied Biosciences, Kunsan National University) ;
  • Kim, Kwang Young (Department of Oceanography, College of Natural Sciences, Chonnam National University)
  • Received : 2016.10.11
  • Accepted : 2016.11.17
  • Published : 2016.12.15
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Abstract

We investigated a possible reduction in $CO_2$ uptake rate by phototrophic red tide dinoflagellates arising from mixotrophy. We measured the daily ingestion rates of Prorocentrum minimum by Prorocentrum micans over 5 days in 10 L experimental bottles, and the uptake rates of total dissolved inorganic carbon ($C_T$) by a mixture of P. micans and P. minimum(mixotrophic growth), and for the predator P. micans (phototrophic growth; control) and prey P. minimum (phototrophic growth; control) alone. To account for the effect of pH on the phototrophic growth rates of P. micans and P. minimum, measurements of $C_T$ and pH in the predator and prey control bottles were continued until the pH reached the same level (pH 9.5) as that in the experimental bottles on the final day of incubation. The measured total $C_T$ uptake rate by the mixture of P. micans and P. minimum changed from 123 to $161{\mu}mol\;C_T\;kg^{-1}\;d^{-1}$ over the course of the experiment, and was lower than the $C_T$ uptake rates shown by P. micans and P. minimum in the predator and prey control bottles, respectively, which changed from 132 to $17{\mu}mol\;C_T\;kg^{-1}\;d^{-1}$ over the course of the experiment. The reduction in total $C_T$ uptake rate arising from the mixotrophy of P. micans was 7-31% of the daily $C_T$ uptake rate seen during photosynthesis. The results suggest that red tide dinoflagellates take up less $C_T$ during mixotrophy.

Keywords

References

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