|
| |
|
|
|
|
||||
| Home Help Feedback Subscriptions Archive Search Table of Contents | ||||
|
Fig. 5. Radiance spectra of Banksia attenuata, compared to spectral
sensitivity of honey possum cones. (A) Three examples of mature, food bearing,
inflorescences alongside the chromatically nearest immature inflorescence (see
Materials and methods). The maturity of the mature samples increases from top
to bottom panels. The spectra are normalised for luminance (i.e. the
absorption of honey possum L cones is equated). (B) Relative sensitivity of
honey possum S cone (grey), M cone (grey), L cone (solid black line), and a
hypothetical L cone (L') with 
max value at 580 nm
(broken black line). The sensitivity curves have been adjusted for lens
absorbance and self screening (see Materials and methods). The tuning of the
honey possum L cone is approximately aligned with the local peak of the
immature radiance spectra - characteristic of chlorophyll. If the L cone
max was incrementally shifted from 557 nm to longer
wavelengths, the contrast between the mature and immature spectra would reduce
at first, and then increase again for much longer wavelength
max values. Note that with L and M cone
max values at 557 nm and 505 nm, the L:M absorption ratio
is higher for immature than mature inflorences - the opposite relationship to
that for human colour vision with max values at 565 nm and
535 nm.
|
