Journal
JOURNAL OF EUKARYOTIC MICROBIOLOGY
Volume 58, Issue 3, Pages 215-222Publisher
WILEY
DOI: 10.1111/j.1550-7408.2011.00550.x
Keywords
Chauonella; feeding; Fibrocapsa; food web; graze; harmful algal bloom; Heterosigma; red tide; trophic interactions
Categories
Funding
- Korea Government/MEST [NRF-CIA BA001-2010-0020700]
- KIMST award
- National Research Foundation of Korea [2010-0020702] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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Marine raphidophytes are common red tide organisms that are distributed worldwide. They are known to be harmful to other plankton and fish and have often caused large-scale fish mortality in many countries. Thus, the population dynamics of raphidophytes is a critical concern for scientists, the aquaculture industry, and government officers from many countries. Raphidophyte growth and mortality should be investigated to understand bloom dynamics. Raphidophytes were thought to be exclusively autotrophic organisms. However, several recent studies have revealed that raphidophytes are able to feed on heterotrophic and autotrophic bacteria, i.e. raphidophytes are mixotrophic algae. Further, high-resolution video microscopy has revealed the mechanism by which raphidophytes feed on bacteria, which involves capturing prey cells in the mucus excreted by mucocysts and engulfing the cells through mucocysts. These discoveries may influence the conventional view on both raphidophyte bloom dynamics and plankton energy flow and carbon cycling. In the present study, I review prey, feeding mechanisms, and ingestion rates of mixotrophic marine raphidophytes. In addition, I examine the ecological significance of raphidophyte mixotrophy.
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