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Mixotrophy in the dinoflagellate Prorocentrum minimum

1997; Inter-Research; Volume: 152; Linguagem: Inglês

10.3354/meps152001

1616-1599

DK Stoecker, A Li, D. Wayne Coats, DE Gustafson, MK Nannen,

Protist diversity and phylogeny

MEPS Marine Ecology Progress Series Contact the journal Facebook Twitter RSS Mailing List Subscribe to our mailing list via Mailchimp HomeLatest VolumeAbout the JournalEditorsTheme Sections MEPS 152:1-12 (1997) - doi:10.3354/meps152001 Mixotrophy in the dinoflagellate Prorocentrum minimum Stoecker DK, Li A, Coats DW, Gustafson DE, Nannen MK Prorocentrum minimum (formerly also known as P. mariae-lebouriae) is a common bloom-forming, photosynthetic dinoflagellate in Chesapeake Bay, USA. It is also capable of ingesting other cells. In Chesapeake Bay, P. minimum usually co-occurs with cryptophytes. Ingested cryptophyte material is observable in the dinoflagellate under an epifluorescent microscope as orange-fluorescent inclusions (OFI). During April and May, the frequency of OFI was <=10% in both surface and pycnocline assemblages. In summer, up to 50% of the P.minimum contained OFI. The frequency of OFI was positively correlated with cryptophyte abundance, but OFI were not frequent in all populations of P. minimum when cryptophyte densities were high. On-deck experimental incubations were done to determine the conditions that influence feeding. Light level and inorganic nutrient availability over the previous 24 h affect feeding.Incidence of feeding is lower when populations are maintained in the dark for 24 h than on a natural light:dark cycle. Addition of nitrate and phosphate together can inhibit feeding. Ingestion has a diel pattern, with frequency of OFI highest in the afternoon and evening and lowest in the morning. Feeding is influenced by a complex of factors, but the spatial-temporal pattern of ingestion and the experiments both suggest that feeding is primarily a mechanism for obtaining limiting inorganic nutrients rather than a mechanism for supplementing carbon nutrition during light limitation. Ingestion of other protists, including competitors for light and nutrients, may be an important strategy which allows bloom-forming dinoflagellates to dominate plankton assemblages for extended periods and during changing nutrient regimes. Prorocentrum · Dinoflagellates · Cryptophytes · Mixotrophy · Chesapeake Bay Full text in pdf format NextExport citation RSS - Facebook - Tweet - linkedIn Cited by Published in MEPS Vol. 152. Publication date: June 26, 1997 Print ISSN:0171-8630; Online ISSN:1616-1599 Copyright © 1997 Inter-Research.