1This article was presented in the symposium, Alternative Nutritional Strategies, at the joint meetings of the International Society of Protistologists and the British Society for Protist Biology, University of Kent, Canterbury, UK, July 18–23, 2010.
The Role of Photosynthesis and Food Uptake for the Growth of Marine Mixotrophic Dinoflagellates1
Article first published online: 24 MAR 2011
© 2011 The Author(s). Journal of Eukaryotic Microbiology© 2011 International Society of Protistologists
Journal of Eukaryotic Microbiology
Volume 58, Issue 3, pages 203–214, May/June 2011
How to Cite
HANSEN, P. J. (2011), The Role of Photosynthesis and Food Uptake for the Growth of Marine Mixotrophic Dinoflagellates. Journal of Eukaryotic Microbiology, 58: 203–214. doi: 10.1111/j.1550-7408.2011.00537.x
- Issue published online: 9 JUN 2011
- Article first published online: 24 MAR 2011
- Received: 12/28/10; accepted: 12/29/10
- food uptake;
ABSTRACT. Mixotrophy (i.e. combined use of photosynthesis and food uptake for growth) is widespread among marine dinoflagellates. Species with permanent chloroplasts generally display a growth response towards irradiance like an ordinary autotrophic alga. However, some species cannot grow in the light on a standard inorganic nutrient medium, because they require the ingestion of prey for sustained growth. This includes species with various types of chloroplast origin. Only a few species have been shown to be able to grow in the dark if supplied prey. About half of the studied species were primarily phototrophic species, and food uptake marginally increased their growth rates at low irradiances. In the remaining species, food uptake increases to a large degree their growth rate when light is limiting and in some cases even when irradiance is not limiting growth. Some of these species grow relatively fast at high irradiances without food, while other species only grow slowly or cannot even maintain themselves at high irradiances without food. Dinoflagellates, which form symbioses with endo- and ectosymbionts are a very heterogeneous group, which have been studied only sporadically. Some species are clearly primarily phototrophs, while others rely heavily on food uptake for growth.