Lopez, G. R. State University of New York, glopez@notes.cc.sunysb.edu

 
FACTORS CONTROLLING DIGESTION AND ABSORPTION IN THE SPIONID POLYCHAETE STREBLOSPIO BENEDICTI.
 
Radiotracer experiments have determined that this small, facultative deposit feeder absorbs sedimentary foods very poorly but planktonic foods very well. An unusual digestive feature of this species is a short gut residence time; material passes through juveniles in as little as two minutes. Discrepancies in carbon absorption from benthic and planktonic foods (70% vs. 10% for planktonic and benthic diatoms, respectively) will be examined by focusing on the digestive environment in the gut. In situ chemical properties of the gut have been examined by employing novel fluorescent tracers, combined with quantitative fluorescence image analysis. Gut pH, surfactancy, and enzyme activity will be discussed. Mechanical properties of the gut will also be evaluated. These gut properties will also be discussed in terms of how they change with body size.
 
Day: Wednesday, Feb. 3
Time: 02:30 - 02:45pm
Location: Hilton of Santa Fe
 
Code: SS21WE0245H