Resolution:
## Figure 2.
Relative eye size and optical ratios of nocturnal and diurnal teleost reef fish. Panel (a) shows that nocturnal reef teleosts (black circles) have larger eye diameter
for given body mass than diurnal species (yellow circles). Open circles are elopomorphs,
which have very elongated bodies that make a comparison with body mass as independent
variable impossible. The plot of the square of lens diameter against the product of
eye diameter and axial length (OPT_{morph1}) reveals that nocturnal reef teleosts have a relatively large lens (b). Nocturnal
fish have more circular pupils than diurnal fish (c), and if one combines the pupil
ratio with OPT_{morph1}, cancelling out the ratio of lens diameter and axial length, a fairly clear delineation
between groups of diel activity pattern emerges (d).
Schmitz and Wainwright |