Costello, J. H. Providence College, costello@providence.edu
Raposa, R. H. Woods Hole Oceanographic Institution, rcoverd@mit.edu

 
HYDRODYNAMIC CAMOUFLAGE AND PREDATION BY THE LOBATE CTENOPHORE MNEMIOPSIS LEIDYI
 
Previous research has shown that lobate ctenophores of the genus Mnemiopsis consume calanoid copepods and that copepod captures occur on the interior surfaces of the ctenophore's oral lobes. However, this pattern is puzzling because calanoid copepods are also known to be highly sensitive to mechanical stimuli and capable of detecting small fluid disturbance created by swimming prey, conspecifics, predators and even the presence of container walls. Why then do calanoid copepods not detect and avoid the enclosed volume between a ctenophore's oral lobes? Analysis of flow fields surrounding Mnemiopsis leidyi demonstrates that velocity and shear gradients are greatest immediately adjoining the lobes and decrease rapidly towards the midregion between the lobes. Thus, copepods encounter a hydrodynamic
 
Day: Tuesday, Feb. 2
Time: 09:45 - 10:00am
Location: Hilton of Santa Fe
 
Code: SS02TU0945H