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Fig. 3. Maze with covered middle segment and open bends. The Perspex did not cover
the bends, allowing a view of the sky up to 15 cm into the middle segment on
both sides. (A) Eastward orientation. Conventions as in
Fig. 2: mean vectors
347.2°/351.1°/344.0°; at all radii not significantly different
from 355° (open arrowhead), but highly significantly different from
315° (P<0.01); vector lengths 0.86/0.94/0.97; N=25,
25, 15. Note that in this maze a -5° or +5° deviation from a purely
northern course is now expected, even if the ants had ignored the covered
middle segment, since an uncovered middle segment of 30 cm has to be taken
into account for the calculation of the expected home vector. (B)
26.4°/27.1°/36.8°; 0.95/0.96/0.98; N=21, 21, 12. At all
radii mean vectors significantly different both from 5° (open arrowhead)
and from 45° (P<0.01), except at 3 m radius (not significantly
different from 45°). Mean vectors of A and B significantly different
(Watson-Williams test with Bonferroni correction, P<0.01 to
0.001).
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