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Fig. 4. Homing distances of experimental ants. The top panels show search density
plots (abscissae, homing distance; ordinates, cumulated relative search
densities between the first and sixth turning points; see Materials and
methods), the bottom panels show box-and-whisker plots (medians of the initial
six turning points; compare Fig.
1,bottom), derived from the same data sets (N=25 ants for
each experimental situation). (A) The ants were tested immediately after the
lengths of their legs had been modified at the feeding site, that is, leg
lengths were normal during the outbound journey but manipulated during the
homebound run (Test 1). (B) The ants were tested after re-emerging from the
nest after previous manipulation. In this situation leg lengths were equal,
though manipulated, during outbound and homebound runs (Test 2). The hatched
box plots in the lower panel of A illustrate the search centres as predicted
from the high-speed video analyses of stride lengths in normal and manipulated
animals; for details see text. Colour code: red, stilts; blue, normal; yellow,
stumps I; green, stumps II.
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