The nanoanatomical basis of sexual dimorphism in iridescent butterfly colouration

Thomas E. White*, Joseph Macedonia, Debra Birch, Judith Dawes, Darrell J. Kemp

*Corresponding author for this work

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Structurally generated colours are at least as commonplace and varied components of animal signals as pigment colours, yet we know far less about the former, both in terms of the patterns and phenotypic variation and of their underlying correlates and causes. Many butterflies exhibit bright and iridescent colour signals that arise from a characteristic 'ridge-lamellar' scale surface nanoarchitecture. Although there are multiple axes of functional variation in these traits, few have been investigated. Here we present evidence that sexual dimorphism in the expression of a sexually homologous ridge-lamellar trait (iridescent ultraviolet) is mediated by sex differences in the density of lamellar-bearing scale ridges. This trait - ridge density - has also been causally related to iridescent signal variation in other coliadines (e.g. C. eurytheme), which suggests that it may offer a common basis to both intra- and intersexual differences in ultraviolet wing reflectance among these butterflies.

Original languageEnglish
Pages (from-to)101-107
Number of pages7
JournalAustralian Journal of Zoology
Volume60
Issue number2
DOIs
Publication statusPublished - 2012

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