CS06 Benthos
Date: Friday, June 14, 2002
Time: 9:15:00 AM
Location: Colwood
 
MahonHK, Dept. of Biological Sciences, Old Dominion University, Norfolk, USA, hmahon@odu.edu
Dauer, D, M, Dept. of Biological Sciences, Old Dominion University, Norfolk, USA, ddauer@odu.edu
 
RESPONSES OF JUVENILE AND ADULT STREBLOSPIO BENEDICTI (SPIONIDAE) TO CHEMICAL CUES BOUND TO GLASS MICROBEADS
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Spionid polychaetes feed at the sediment-water interface using a pair of ciliated palps. Spionids select food particles based upon characteristics including size, texture and specific gravity. In addition, chemical cues also play an important role in selectivity. Juvenile and adult spionids may have different stable isotopic carbon signals, indicating the potential to differentiate chemical cues ontogenetically. In the present study, we tested the responses of juvenile and adult Streblospio benedicti to seven chemical cues bound to glass microbeads (five amino acids and two carbohydrates). All chemicals used were previously shown to increase feeding rates of spionids. For all seven chemical cues, juveniles and adults were highly selective of organically coated beads over uncoated beads (greater than 70%). Two of the cues showed significant differences between juveniles and adults. Juveniles were highly selective for threonine while adults were highly selective for proline