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- Title
THE MARINE MIXOTROPH <em>DINOBRYON BALTICUM</em> (CHRYSOPHYCEAE): PHAGOTROPHY AND SURVIVAL IN A COLD OCEAN.
- Authors
Mckenzie, Cynthia H.; Deibel, Don; Paranjape, Madhu A.; Thompson, Raymond J.
- Abstract
The marine chrysophyte Dinobryon balticum (Schütt) Lemm. Was one of the dominant members of the phytoplankton community (1.8 × 10[sup5] cells-L[sup-1]) in June and July in Conception Bay, Newfoundland, Dinobryon balticum colonies were common only in samples from June and July. The cells were concentrated at 5 m (X ± SD = 1.11 ± 4 x 10[SUP5] cells-L[SUP-1]) and at 40 m (3.32 ± 2 x 10[sup4]-L[sup-1]) depths. Colonies were composed of up to 560 cells with a mean (±SD) colony size of 10 ± 1 cells at 5 m and 40 ± 8 cells at 40 m. Florescent latex bead-uptake experiments conducted with field samples indicated that that marine species was capable of phagotropy and that twice as many Dinobryon cells were ingesting beads at 40 m than at 5 m, although the ingestion rates for those cells actively ingesting beads were similar at both depths. This chrysophyte was found in association with bacteria- and nutrient-rich microhabitts of microaggregates and fecal pellets. The cells and colonies observed in this study appeared to be healthy, as demonstrated by their appearance and their ability to ingest beads.
- Subjects
CHRYSOPHYCEAE; OCEAN; ECOLOGICAL niche; INGESTION; GRAZING; PHYTOPLANKTON
- Publication
Journal of Phycology, 1995, Vol 31, Issue 1, p19
- ISSN
0022-3646
- Publication type
Article
- DOI
10.1111/j.0022-3646.1995.00019.x