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Fig. 4. Summer and autumn orientation of juvenile green turtles. Each dot within a
circular diagram represents the mean angle of orientation for a single turtle
during its 10-min trial. The triangle on the outside of each circle
corresponds to the direction towards the capture area for each group of
turtles. The broken lines represent the 95% confidence interval for the mean
angle. (A) Orientation of green turtles tested between May and September
1998–1999. Turtles were significantly oriented with a mean angle of
50° (N=9, r=0.71, P<0.0025 V-test,
95% confidence interval ±37°). The confidence interval overlaps the
direction to the capture site (74°). (B) Autumn orientation of green
turtles tested in October and November 1998 and 2001. Turtles were
significantly oriented with a mean angle of 199° (N=7,
r=0.76, P<0.02 Rayleigh test, 95% confidence interval
±39°). This direction of orientation is consistent with that
observed in wild turtles during the autumn migration.
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