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Fig. 2. (A) Side view of video images of the downstroke flick (lasting 100 ms) by
the lateral flagellum of a P. argus antennule, showing its position
at the start (1) and end (2) of the flick as it passes through an odor plume.
The lateral flagellum of the antennule appears light because it was flicking
in a plane illuminated by a sheet of laser light. The medial flagellum of the
antennule, which did not move during the flick, appears black because it was
not in the plane illuminated by the laser. The lobster was facing upstream in
a flume (flow from left to right) and the antennule was flicking in a
turbulent plume of odor mixed with fluorescent dye (fluorescein), which
appears as pale filaments swirling in the water around the antennule. (B)
Diagram of a cross-section of the lateral flagellum, showing the orientation
(angle between dotted lines) of the aesthetascs with respect to the direction
of the rapid antennule downwards flick (left diagram) and slower upwards
return stroke (right diagram). The direction of water motion relative to the
antennule, which changes as a result of the antennular motion is indicated by
the solid arrows.
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