期刊
JOURNAL OF EUKARYOTIC MICROBIOLOGY
卷 62, 期 4, 页码 431-443出版社
WILEY-BLACKWELL
DOI: 10.1111/jeu.12198
关键词
Alveolate; cryptophyte; grazing; nutrient starvation; phagotrophic phototroph; stress; Teleaulax amphioxeia
类别
资金
- National Science Foundation OCE [1031718, 1436169]
- Andrew W. Mellon Foundation Endowed Fund for Innovative Research
- Directorate For Geosciences
- Division Of Ocean Sciences [1031718, 1436169] Funding Source: National Science Foundation
Prorocentrum minimum is a neritic dinoflagellate that forms seasonal blooms and red tides in estuarine ecosystems. While known to be mixotrophic, previous attempts to document feeding on algal prey have yielded low grazing rates. In this study, growth and ingestion rates of P. minimum were measured as a function of nitrogen (-N) and phosphorous (-P) starvation. A P. minimum isolate from Chesapeake Bay was found to ingest cryptophyte prey when in stationary phase and when starved of N or P. Prorocentrum minimum ingested two strains of Teleaulax amphioxeia at higher rates than six other cryptophyte species. In all cases -P treatments resulted in the highest grazing. Ingestion rates of -P cells on T. amphioxeia saturated at similar to 5 prey per predator per day, while ingestion by -N cells saturated at 1 prey per predator per day. In the presence of prey, -P treated cells reached a maximum mixotrophic growth rate ((max)) of 0.5d(-1), while -N cells had a (max) of 0.18d(-1). Calculations of ingested C, N, and P due to feeding on T. amphioxeia revealed that phagotrophy can be an important source of all three elements. While P. minimum is a proficient phototroph, inducible phagotrophy is an important nutritional source for this dinoflagellate.
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