Eyespan width (mm; Eye.span) in 45 stalk-eyed flies
(Cyrtodiopsis dalmanni) fed a corn or cotton diet (Food).
Arguments
source
David, P., T. Bjorksten, K. Fowler, and A. Pomiankowski. 2000.
Condition-dependent signalling of genetic variation in stalk-eyed flies.
Nature 406: 186-188.