HCNSO Student Theses and Dissertations
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Defense Date
1991
Document Type
Thesis - NSU Access Only
Department
Oceanographic Center
First Advisor
Curtis Burney
Second Advisor
Richard E. Dodge
Third Advisor
Patricia Blackwelder
Fourth Advisor
Shaila R. Cummings
Abstract
Batch cultures of Fayella panamenis were pulse fed Heterocapsa triquetra at concentrations ranging from 200 to 3,000 cells/ml. The digestion process was followed using both bright field and epifluoresence microscopy for live and fixed ciliates. Ingestion rates, vacuole passage times, and the time required for complete digestion of vacuolar contents were determined during pulse feeding experiments. Findings indicate the following. 1) The digestion rate of Favella panamenis begins to saturate at 2,000-2,500 Heterocapsa/ml. The ingestion rate increases over the range of Heterocapsa/ml studied (200 to 3,000 cells/ml). 2) Each ciliate could fully digest ≤ 3 Heterocapsa simultaneously. If the cell ingested ≥ 4 Heterocapsa at one feeding, the food items were excreted partially digested. Ingestion of ≥ 3 Heterocapsa per ciliate began at an initial food concentration of 2,500 Heterocapsa/ml.
The results suggests that the rate of digestive enzyme production may limit the transfer of energy through microbial food webs under food saturating or bloom conditions. This may ultimately decrease growth efficiencies at high feeding rates, which then must be considered in energy and carbon flow calculations.
NSUWorks Citation
Anthony Russo. 1991. Digestion and Vacuole Passage Time in the Tintinnid Favella panamenis Feeding on the Dinoflagellate Heterocapsa triquetra. Master's thesis. Nova Southeastern University. Retrieved from NSUWorks, Oceanographic Center. (360)
https://nsuworks.nova.edu/occ_stuetd/360.