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Fig. 6. (A) The average spectral reflectance of crabs in three neighbouring
colonies of Uca vomeris and the presence (B) and behaviour (C) of
predatory birds at the same three sites. At three sites, called `North',
`Central' and `South' (see inset map on top), we measured the spectral
reflectance of carapace colours for 10–21 crabs at each site and
subsequently recorded bird activity over 3 consecutive days. (A) The
reflectance spectra of crabs from the three sites [means (red) ± s.e.m.
(dark blue)]. The black bars below the right panel indicate the range of the
spectrum over which the respective reflectance distributions do not overlap at
the level of means ± 2 s.e.m. (light blue areas). Three measurements
per crab were averaged, before averaging across crabs. (B) The total number of
birds observed at the three sites over 3 consecutive days. (C) The total
number of high-flying (High), low-flying (Low), and ground-hunting birds
(Ground) at the three sites, summed over 3 days of observation. Compared to
the `North' and `Central' colonies, the `South' colony, with the most
colourful crabs, experiences very few predatory birds (right panels).
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