The Evolution of Wing Coloration in Lepidoptera

Objective

The seemingly endless diversity of color patterns in the wings of Lepidoptera (butterflies and moths) is both a marvel and an enigma. On the one hand, it has been long known that the function of color patterns is visual communication, such as sexual signaling and predator deterrence. On the other hand, the fairly recent discovery that color patterns are determined by only a handful of genetic loci and associated regulatory elements, apparent constraints to diversification. The EWINCOL project will reconcile ecological function and variation of the developmental template to provide a deeper understanding of the relationship between the immense phenotypic and taxonomic diversity within the Lepidoptera that we see today. I posit that wing coloration has facilitated evolutionary diversification in Lepidoptera by being both genetically and developmentally conserved but evolutionarily labile, repeatedly generating variation that fuels selection. With the help of an ERC starting grant I will test this hypothesis by implementing a research program that will make innovative use of natural history museum collections and online citizen science platforms. First, I will leverage phenotypic information from large public image databases by using cutting edge artificial intelligence (AI) methods to create a comprehensive database of coloration and shape traits of all major Lineages within Lepidoptera. This database will then allow me to i) map out the evolutionary history of coloration in Lepidoptera and test how variation in coloration relates to diversification in a phylogenetic context, ii) investigate to which degree the evolution of coloration and wing morphology are independent from one another, and iii) ascertain the role of environmental factors like habitat, light and temperature in shaping the distribution of coloration in butterflies across the globe. Overall, EWINCOL will deepen our understanding of the evolutionary dynamics in one of the most diverse groups on earth.