What is it about?
This study looks at how ladybirds produce their bright colours. Until now, these colours were thought to come only from pigments, such as melanin (for black) and carotenoids (for red and orange). However, by studying two common ladybird species, researchers have discovered that the surface and internal structure of their hard outer wings (called elytra) also influence how colours appear. These microscopic structures can reflect and scatter light in specific ways, meaning colour is produced not just by pigments, but also by the way light interacts with the elytra structure. This discovery changes our understanding of colour in ladybirds, suggesting that both chemistry and physics play a role in how animals use colour for signalling.
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Why is it important?
The study reveals that the elytra of ladybirds act as complex optical systems in which both structural organisation and pigments interact to produce the final perceived colour. Two physical mechanisms are identified: multilayer interference within the exocuticle and light scattering by surface concavities. Localised chemical analyses (Raman spectroscopy, UHPLC–HRMS, metabolomics) also show interspecific differences in the elytra composition. These findings challenge the prevailing assumption that colouration is purely pigment-based, offering instead a new, integrative framework for interpreting visual signals in ecological and evolutionary contexts. They highlight the importance of including structural analysis alongside pigments in genetic studies of animal colouration and communication.
Perspectives
Working on this article has been a truly enriching experience, as it brought together researchers from diverse disciplines, such as physics, chemistry and ecology, to collaborate on this project. The most exciting aspect for me was seeing how physical structures, which are often overlooked in ecological studies, can have such a strong impact on biological signals such as colour. I hope this work encourages others to explore the interplay between structural properties, light and function. I also believe that examining biological structures through the lenses of both evolutionary biology and materials science offers great potential for understanding life and inspiring future technologies. Above all, I hope this article inspires curiosity in readers and motivates young scientists to discover the physics behind nature's beauty.
Marzia Carrada
Read the Original
This page is a summary of: Decoding ladybird’s colours: Structural mechanisms of colour production and pigment modulation, PLOS One, June 2025, PLOS,
DOI: 10.1371/journal.pone.0324641.
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