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Fig. 3. Tracking of crayfish through the different environments. (A) Coordinates of
the rostrum were tracked and angles measured between successive points. Three
examples are shown for a crayfish that started parallel to the wall (0°),
then moved away from the wall (negative angles up to -90°) and then moved
back toward the wall (positive angles up to 90°). A reference coordinate
was also logged (white circle on wall). An example of the calculation of
angles is shown below. (B) A crayfish in the laneway of the texture experiment
with its flagella spread to contact the wall on each side. Four points were
tracked - rostrum, tailfan edge, left and right antennae - as indicated by
solid circles. Apparatus reference coordinates of the centre line start point
and one of the walls were also taken (white circles). Angles indicated for the
antennae movement:x, angle at which each antenna was held with respect
to the body axis, andx, angle between the antennae.
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