In a breakthrough study on insect migration, researchers led by evolutionary biologist Daria Shipilina from the Institute of Science and Technology Austria have unearthed surprising insights about the migratory patterns of the painted lady butterfly, known scientifically as Vanessa cardui. This butterfly is not only remarkable for its extensive migration, spanning up to 15,000 kilometers annually, but also for how its migration patterns differ fundamentally from those of better-studied birds.
Shipilina, fascinated by the genetic underpinnings of phenotypes—the observable traits shaped by both genetics and environment—has focused her research on comparing the genomes of butterflies traveling different migratory routes. In a study published in PNAS Nexus, her team investigated whether there are distinct genetic differentiations between short-distance and long-distance migrants among these butterflies, analogous to what has been observed in birds.
Interestingly, the study reveals that both migratory groups within the painted lady species belong to one interbreeding population with no significant genetic differences, a finding Shipilina described as unexpected. "Most migration genomic studies have focused on birds. But butterflies behave differently: they are a moving population that genetically behaves as one," she explained. This discovery has implications for understanding how these insects adapt to diverse environments, as the migration distances seem more influenced by external conditions rather than genetic factors.
The research, a collaborative effort from institutions across Austria, Benin, Canada, Senegal, Spain, and Sweden, utilized cutting-edge genomic tools and isotopic analysis. The painted lady butterflies’ wings hold stable isotopes of hydrogen and strontium from their larval diet, which act as geographical markers. With advanced mapping of isotope concentrations throughout Europe and North Africa, the team was able to deduce the butterflies’ points of origin and assess their migratory distances.
The study also examined physical attributes like wing size and wear, finding that these did not dictate migration length, and some butterflies showed minimal wing-wear despite traveling thousands of kilometers. This counters previous assumptions that physical wing condition correlates directly with migratory effort.
While the research provides groundbreaking insights, it also opens new questions about global migration behaviors in butterflies. Shipilina’s team plans to investigate potential genetic variations among populations from distant regions such as the UK and Japan, seeking to understand environmental influences on migration patterns in varying climates.
With climate change poised to affect migratory behaviors profoundly, Shipilina emphasized the need for more comprehensive genetic and isotopic research. She noted, "Insect migration will genetically be quite different from how migration works in birds. But I really hope these two will coexist together so we can compare, can mix and match, find similarities, and differences."
This research not only advances the field of insect migration but also underscores the vast genetic territory yet to be explored. As scientists delve deeper into these migratory mysteries, they push the frontier of understanding how environmental changes impact species that traverse the globe, a critical endeavor in today’s rapidly changing world.
Original Source: https://www.thehindu.com/sci-tech/science/painted-lady-butterflies-dont-migrate-like-birds-ask-their-genes/article69396102.ece
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Publish Date: 2025-04-02 05:30:00
