SS1.04 Small-scale Biophysical Coupling in Plankton Ecology
Date: Thursday, June 13, 2002
Location: Poster Session - VCC
ChangY, Georgia Tech/Biology, Atlanta, USA,
Brown, J, , Georgia Tech/Biology, Atlanta, USA,
Webster, D, R, Georgia Tech/Civil and Environmental Engineering, Atlanta, USA,
Yen, J, , Georgia Tech/Biology, Atlanta, USA,
Interaction of pleopod movements and flow fields of the krill, Euphausia pacifica
Aquatic organisms rely on their fluid environment for transport. For krill living in a somewhat viscous (Re~500) habitat, locomotory movements will alter the fluid structure in its vicinity and influence organisms found within this field as well. This study determines whether individuals of Euphausia pacifica respond to this disruption by changing its rate of swimming. Using high-speed video techniques, pleopod movements are directly correlated to the generated flow field which is captured simultaneously using digital particle image velocimetry (DPIV). This provides an opportunity to evaluate the translation of biomechanical energy to fluid flow. Pleopod movement is assessed for tethered E. pacifica: (1) in still water, (2) in water flow simulating natural swimming, and (3) entrained from the flow field of another individual. Implications for the adoption of schooling as a hydromechanically facilitating process are addressed.